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360

Chapter 7

General Troubleshooting

Block Diagram Description

The cal oscillator output has three forms (all

−

35 dBm):

• 10.7 MHz

• 9.9 to 11.5 MHz in 100 kHz steps

• Frequency sweeps from 20 kHz to 2 kHz centered at 10.7 MHz

(lasting 5 to 60 ms respectively)

The purpose of these signals is:

• Adjust gains, log amps, and video slopes and offsets

• Adjust 3 dB bandwidth and center frequencies of LC resolution BW

filters (30 kHz through 1 MHz).

• Adjust 3 dB bandwidth, symmetry, and gain of the crystal resolution

BW filters (300 Hz through 10 kHz).

• Adjust gain and gain-vs-frequency for digital resolution bandwidths

(1 Hz through 100 Hz).

A5 IF Assembly

The A5 IF assembly has four crystal filter poles, four LC filter poles,
and step gain amplifiers. The crystal filters provide resolution
bandwidths of 300 Hz to 10 kHz. The LC filters provide resolution
bandwidths of 30 kHz to 2 MHz. All filter stages are in series. PIN diode
switches bypass unwanted stages.

An automatic IF adjustment, in spectrum analyzer firmware, sets
center frequency and 3 dB bandwidth of all filter poles through varactor
and PIN diodes. The firmware also controls crystal-pole symmetry and
the step gain amplification.

ADC/Interface Section

The ADC/interface section is the link between the controller section and
the rest of the spectrum analyzer. It controls the RF, synthesizer, and IF
sections through address and data lines on the W2 control cable (analog
bus). Analog signals from these sections are monitored by the ADC
(analog to digital converter) circuit on the ADC/interface section.

The ADC/interface section includes the A3 interface assembly, A1A1
keyboard, and A1A2 RPG (front panel knob). The A3 assembly includes
log expand, video filter, peak detector, track-and-hold, real-time DACs,
RF gain DACs, +10 V reference, and ADC circuitry. The digital section
of the A3 assembly includes ADC ASM, sweep trigger, keyboard
interface, RPG interface, and analog bus interface circuitry.

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Summary of Contents for 8564EC

Page 1: ...vice Guide Agilent Technologies 8564EC and 8565EC Spectrum Analyzers Manufacturing Part Number 08564 900xx Printed in USA January 2010 Supersedes December 1999 Copyright 1995 2001 Agilent Technologies Inc ...

Page 2: ...tions at the time of shipment from the factory Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology to the extent allowed by the Institute s calibration facility and to the calibration facilities of other International Standards Organization members General Safety Considerations The following safe...

Page 3: ... socket outlet provided with protective earth contact Any interruption of the protective grounding conductor inside or outside the instrument or disconnection of the protective earth terminal can result in personal injury If this instrument is used in a manner not specified by Agilent Technologies the protection provided by the instrument may be impaired There are many points in the instrument whi...

Page 4: ...se with an instrument will execute its programming instructions when properly installed on that instrument Agilent Technologies does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or...

Page 5: ... 48 Safety Considerations 49 Which Adjustments Should Be Performed 50 Adjustment Tools Table 2 1 on page 51 50 Instrument Service Position 51 Getting Started 54 Spectrum Analyzers 54 Controller Computer 54 Test Equipment 55 Warm up Time 55 Equipment Connections 57 Using the Adjustment Diagnostic Software 58 To Load the Program 58 To Use the Adjustment Program 59 Automated Adjustments 62 1 Initial ...

Page 6: ...ed Performance Tests 75 Procedure 75 11 DC Log Adjustment 76 Assembly Adjusted 76 Related Performance Tests 76 Procedure 76 12 Sampling Oscillator 78 Assembly Adjusted 78 Related Performance Test 78 Procedure 78 To Use the Diagnostics 79 DAC Control 79 Latch Control 83 Display IF CAL Data 83 Cal Oscillator Control 84 IF Diagnostics 85 RF Diagnostics 85 3 Manual Adjustment Procedures Introduction 9...

Page 7: ...e 111 LC Bandpass Adjustments 112 XTAL Bandpass Adjustments 114 4 IF Amplitude Adjustments 116 Assembly Adjusted 116 Related Performance Tests 116 Description 116 Equipment 117 Procedure 118 A5 Reference Attenuator Adjustment 119 A5 Adjustment Verification 120 5 DC Log Amplifier Adjustments 121 Assembly Adjusted 121 Related Performance Tests 121 Description 121 Equipment 122 A4 Limiter Phase Adjus...

Page 8: ...djusted 140 Related Performance Test 140 Description 140 Equipment 141 Procedure 141 11 Demodulator Adjustment 142 Assembly Adjusted 142 Related Performance Test 142 Description 142 Equipment 143 Procedure 143 12 External Mixer Bias Adjustment 145 Assembly Adjusted 145 Related Performance Test 145 Description 145 Equipment 145 Procedure 146 13 External Mixer Amplitude Adjustment 147 Assembly Adjus...

Page 9: ... Log Amplifier Adjustments 169 Assembly Adjusted 169 Related Performance Tests 169 Description 169 Equipment 170 A4 Limiter Phase Adjustment 171 A4 Linear Fidelity Adjustment 172 A4 LOG Fidelity Adjustment 173 4 Assembly Replacement Introduction 176 Access to Internal Assemblies 177 Cable Color Code 178 Procedure 1 Spectrum Analyzer Cover 179 Removal Replacement 179 Procedure 2A A1 Front Frame A18...

Page 10: ...212 Replacement 213 Procedure 7 A6A1 High Voltage Assembly 8564E and 8565E 216 Removal 216 Replacement 218 Procedure 8 A7 through A13 Assemblies 220 A7 LO Multiplier Amplifier LOMA 222 Removal 222 Replacement 222 A8 Low Band Mixer 223 Removal 223 Replacement 223 A9 Input Attenuator 224 Removal 224 Replacement 225 A10 A12 RYTHM SBTX 227 Removal 227 Replacement 227 A11 YTO 228 Removal 228 Replacemen...

Page 11: ...263 Firmware Dependent Part Numbers 264 Replaceable Parts 270 6 Major Assembly and Cable Locations Introduction 304 7 General Troubleshooting Introduction 316 Assembly Level Text 316 Block Diagrams 316 Assembly Test Points 317 Ribbon Cables 317 Service Cal Data Softkey Menus 322 Troubleshooting to a Functional Section 324 Error Messages 326 Viewing Multiple Messages 327 Error Message Elimination 3...

Page 12: ...ter 395 Video Filter Buffer Amplifier 396 Positive Negative Peak Detectors 397 Peak Detector Reset 398 Rosenfell Detector 399 ADC MUX 400 Variable Gain Amplifier VGA 402 Track and Hold 402 A3 Assembly ADC Circuits 403 ADC Control Signals 403 ADC Start Stop Control 404 ADC ASM 405 ADC 405 Ramp Counter 406 A3 Assembly Control Circuits 407 Analog Bus Drivers 407 Analog Bus Timing 408 Interface Strobe...

Page 13: ...lifiers 444 Video Offset 447 Video Output 447 Frequency Counter Prescaler Conditioner 448 AM FM Demodulator 448 4 8 kHz IF Filters 449 10 7 MHz IF Filters 450 4 8 kHz and 10 7 MHz IF Filters 450 10 6952 MHz VCXO 451 Input Switch 451 LO Switch 452 Synchronous Detector 452 Log Offset Gain Compensation 453 Video MUX 454 A5 IF Assembly 455 IF Signature 456 Common IF Signature Problems 462 1 MHz Resolu...

Page 14: ...k 8564EC and 8565EC 513 16 MHz Harmonic Filter 8564EC and 8565EC 514 State and Trace Storage Problems 515 Keyboard Problems 516 11 Synthesizer Section Introduction 522 Test Connector Locations 524 Troubleshooting Test Setup 527 Confirming a Faulty Synthesizer Section 528 General PLL Troubleshooting 534 PLL Locked at Wrong Frequency 534 Unlocked PLL 535 Unlocked Reference PLL 100 MHz VCXO 537 Opera...

Page 15: ...4 Troubleshooting Using the Diagnostic Software 595 Low Band Problems 599 High Band Problems 600 Low and High Band Problems 601 A7 LO Multiplier and Distribution Amplifier 602 A8 Low Band Mixer 604 A9 Input Attenuator 605 A10 YIG Tuned Filter Mixer RYTHM 608 A12 Switched Barium Tuned Mixer SBTX 609 A13 Second Converter 610 A14 Frequency Control Assembly 612 LO Multiplier Amplifier Drive 612 Contro...

Page 16: ... Intensity Problems 652 Power Supply 654 Troubleshooting Using the TAM 8564E and 8565E only 657 A6 Power Supply Assembly 658 Dead Power Supply 658 Line Fuse Blowing 660 Supply Restarting Every 1 5 Seconds Kick Start 661 Low Voltage Supplies 661 High Voltage Supplies 8564E and 8565E 662 CRT Supply Dropping Out 8564E and 8565E 663 Blanking Signal 8564E and 8565E 663 Buck Regulator Control 664 DC DC ...

Page 17: ...25 1 General Information ...

Page 18: ...ns information required to adjust and service the 8564EC and 8565EC to the assembly level How to Use this Guide page 27 Instrument Variations page 29 Serial Number and Repair Information page 30 Service Kit page 32 Electrostatic Discharge page 33 Returning Instrument for Service page 35 Recommended Test Equipment page 37 ...

Page 19: ...spectrum analyzer s specifications are Tells you how to test your spectrum analyzer 8560 E Series and EC Series Spectrum Analyzer User s Guide Tells you how to make measurements with your spectrum analyzer Tells you how to install your spectrum analyzer Tells you how to program your spectrum analyzer 8560 E Series and EC Series Spectrum Analyzer Quick Reference Guide Is an abbreviated version of t...

Page 20: ...d 8564EC and 8565EC Option 001 2nd IF Output W19 Cable Assembly Rear Panel J10 8564EC and 8565EC Option 005 add Alternative Sweep Output W58 Cable Assembly 8564EC and 8565EC Option 006 Frequency Coverage Down to 30 Hz A8 Low Band Mixer Opt 006 A8 Low Band Mixer Std 8564EC and 8565EC Option 008 SIG ID A15 RF Assembly Opt 008 A15 RF Assembly Std 8564EC and 8565EC Option 103 Delete OCXO A15 RF Assemb...

Page 21: ...rst four numbers and the suffix the last four numbers Figure 1 1 Serial Number Label Example The two letters identify the country in which the unit was manufactured The four numbers of the prefix are a code identifying the date of the last major design change incorporated in your Agilent Technologies product The four digit suffix is a sequential number and coupled with the prefix provides a unique...

Page 22: ...Earlier Serial Number Label Example It is important that you realize that the new serial number format US00000000 is always considered above the earlier format 0000A00000 when you encounter change information such as serial prefix 3425A and above or serial number 3425A00564 and above ...

Page 23: ...the instrument Refer to Table 1 2 for a list of items in the service kit Table 1 2 Service Kit Contents Description Quantity Part Number Cable Puller 1 5021 6773 PC Board Prop 1 5021 7459 Line Filter Assembly 1 5061 9032 Line Switch Cable 1 5062 0728 Extender Cable 1 5062 0737 BNC to SMB snap on Cable 2 85680 60093 Connector Extractor Tool Kit 1 8710 1791 ...

Page 24: ...med on assemblies consisting of electronic components should be done at a static free workstation Figure 1 3 is an example of a static safe workstation using two kinds of ESD protection Conductive table mat and wrist strap combination Conductive floor mat and heel strap combination These methods may be used together or separately Figure 1 3 Example of a Static Safe Workstation ...

Page 25: ...ng the center pin of any connector and before removing any assembly from the unit Be sure all instruments are properly earth grounded to prevent build up of static discharge Static Safe Accessories Table 1 3 Static Safe Accessories Part Number Description 9300 0797 Set includes 3M static control mat 0 6 m 1 2 m 2 ft 4 ft and 4 6 cm 15 ft ground wire The wrist strap and wrist strap cord are not inc...

Page 26: ... listed in Figure 1 4 on page 36 Other Packaging CAUTION Spectrum analyzer damage can result from using packaging materials other than those specified Never use styrene pellets in any shape as packaging materials They do not adequately cushion the equipment or prevent it from shifting in the carton They cause equipment damage by generating static electricity and by lodging in the spectrum analyzer...

Page 27: ... 1 4 inch air filled bubbles Use the pink colored Air Cap to reduce static electricity Wrap the equipment several times in this material to both protect the equipment and prevent it from moving in the carton 6 Seal the shipping container securely with strong nylon adhesive tape 7 Mark the shipping container FRAGILE HANDLE WITH CARE to assure careful handling 8 Retain copies of all shipping papers ...

Page 28: ...uency range 83650A P A T sweeper 8564EC 10 MHz to 40 0 GHz Option 001 008 V 8565EC 10 MHz to 50 0 GHz Frequency accuracy CW 1 10 9 day Leveling mode Internal Power level range 35 to 16 dBm Synthesizer Frequency range 200 Hz to 80 MHz 3335A P A T level generator Frequency accuracy 1 10 7 month M V Flatness 0 15 dB Attenuator accuracy 0 09 dB External 10 MHz reference input Frequency resolution 1 Hz...

Page 29: ...0 ns to 120 s Frequency count range 400 Hz to 11 MHz Frequency resolution 1 mHz Timebase accuracy aging 3 10 7 month External 10 MHz reference input Receivers Spectrum analyzer Frequency range 300 kHz to 7 GHz 8566B P A T Relative amplitude accuracy for Option 002 300 kHz to 2 7 GHz 1 8 dB 300 kHz to 7 GHz 4 0 dB Absolute amplitude accuracy 3 9 GHz to 6 9 GHz 2 7 dB Frequency accuracy 10 kHz at 7 ...

Page 30: ...ope Bandwidth 3 dB dc to 100 MHz 54501A P A T Two channels Minimum vertical deflection factor 5 mV div Minimum timebase setting 100 ns Digitizing display with time cursors Delta t cursor accuracy in 500 ns Div 0 1 µs Amplifier Frequency range 11975 P 8564EC 2 0 to 8 0 GHz 8565EC 2 0 to 8 0 GHz Minimum output power leveled 2 0 to 8 0 GHz 16 dBm Output SWR leveled 1 7 Power supply Output voltage 24 ...

Page 31: ...viation 1 dB nominal Directivity 14 dB minimum Flatness 0 75 dB maximum two required VSWR 1 45 Insertion loss 1 3 dB 10 dB step Attenuation range 30 dB 355D P V attenuator Frequency range dc to 80 MHz Connectors BNC f 1 dB step Attenuation range 12 dB 355C P V attenuator Frequency range dc to 80 MHz Connectors BNC f 20 dB fixed Frequency range dc to 18 GHz 8491B P V attenuator Attenuation accuracy...

Page 32: ...sertion loss 6 dB nominal Output tracking 0 35 dB 26 5 GHz 0 40 dB 50 GHz Equivalent output SWR 1 29 26 5 GHz 1 50 40 GHz 1 65 50 GHz Service accessory kit No substitute 08562 60021 A T Tuning tool No substitute 8710 1010 A Cables Test cable Connectors BNC m to SMB f 85680 60093 A M Length 61 cm 24 in Cable RG 214 U Connectors Type N m 11500A P V Length 91 cm 36 in Cable Connectors SMA m 8120 1578...

Page 33: ... Adapter Type N m to N m 1250 1475 P Adapter Type N f to APC 3 5 m 1250 1750 A Adapter two required Type N m to APC 3 5 m 1250 1743 P M V Adapter Type N m to APC 3 5 f 1250 1744 P V Adapter Type N m to BNC m 1250 1473 P Adapter Type N m to N f 1250 1472 P Adapter Type N f to APC 3 5 f 1250 1745 P V two required Adapter Type N m to SMA f 1250 1250 P V two required Adapter Type N f to SMA f 1250 177...

Page 34: ...to 2 4 mm f 11903B P A T V Adapter Type N f to 2 4 mm m 11903C P Part of microwave workstation P performance tests A adjustments M test adjustment module T troubleshooting V operation verification Table 1 4 Recommended Test Equipment Instrument Critical Specifications for Equipment Substitution Recommended Model Use ...

Page 35: ...replacement parts contact the nearest Agilent Technologies Sales and Service Office listed in Table 1 5 on page 45 In any correspondence be sure to include the pertinent information about model numbers serial numbers and assembly part numbers NOTE Within the USA a toll free phone number is available for ordering replacement parts Refer to the section entitled Ordering Information in Chapter 4 Asse...

Page 36: ...England 44 118 9696622 INTERCON FIELD OPERATIONS Headquarters Agilent Technologies 3495 Deer Creek Rd Palo Alto CA 94304 1316 USA 415 857 5027 Japan Agilent Technologies Japan Ltd Measurement Assistance Center 9 1 Takakura Cho Hachioji Shi Tokyo 192 8510 Japan TEL 81 426 56 7832 FAX 81 426 56 7840 Australia Agilent Technologies Australia Ltd 31 41 Joseph Street Blackburn Victoria 3130 61 3 895 289...

Page 37: ...47 2 Adjustment Diagnostic Software ...

Page 38: ... Some of the adjustments must be done manually The manual adjustment procedures can be found in Chapter 3 of this service guide The following lists identify all of the automated and manual adjustment procedures Automated Adjustments 1 Initial Information page 63 2 LO Frequency page 64 3 YTO FM Coil page 66 4 LOMA Adjustments page 68 5 3rd Amp 2nd IF Align page 71 6 Cal Out Adjustment page 72 7 Fro...

Page 39: ...ction are performed with power supplied to the instrument and protective covers removed There are voltages at many points in the instrument which can if contacted cause personal injury Be extremely careful Adjustments should be performed only by trained service personnel Power is still applied to this instrument with the LINE switch in the off position Before removing or installing any assembly or...

Page 40: ...h Adjustments Should Be Performed Table 2 1 on page 51 lists the adjustments that should be performed when an assembly is repaired or changed It is important to perform the adjustments in the order indicated to ensure that the instrument meets its specifications ...

Page 41: ... related adjustment A2 controller If EEROM from old A2 controller could not be used in new A2 or if EEROM must be replaced also perform the following adjustments LOMA adjustments 4 External mixer amplitude adjustment or 3rd amp 2nd IF align 11 5 Front end cal 7 A3 interface Front end cal 7 A4 log amp cal osc Demodulator adjustment 9 IF amplitude adjustment 2 9 DC log amplifier adjustment 3 10 A5 I...

Page 42: ...ctrum Analyzer Calibration Guide The adjustment must be performed if the performance test fails 7 A10 A12 Front end cal 7 RYTHM SB TX A11 YTO YTO adjustment 5 LO frequency 2 YTO FM coil 3 A13 2nd converter Front end cal 7 A14 frequency control YTO adjustment 5 LO frequency 2 YTO FM cal 3 Front end cal 7 If any automated adjustment is required you must first perform automated adjustment 1 Initial I...

Page 43: ...sampler Sampling oscillator adjustment 4 11 A19 GPIB No related adjustment A21 OCXO 10 MHz reference adjustment OCXO 7 If any automated adjustment is required you must first perform automated adjustment 1 Initial Information Either the manual or the automated adjustment may be performed Perform either the manual YTO adjustment 5 or the automated LO frequency and YTO FM coil adjustments 2 and 3 Tab...

Page 44: ...requires using one of the following HP controllers and the HP BASIC operating system NOTE When using an HP 9000 model 236 HP 9836 controller the graphics in the IF diagnostics program will be very distorted and difficult to read The tabular data printed at the end of the IF diagnostics program which contains the same text information as the graphics is clearly readable Other HP 9000 Series 300 con...

Page 45: ...sted here is not compatible with the adjustment diagnostic software You do not need all the test equipment connected to perform the adjustments You need only connect the equipment specified in each adjustment to run that adjustment Warm up Time Test Equipment Warm up Allow sufficient warm up time for test equipment Refer to their individual operating and service manuals for warm up specifications ...

Page 46: ...er sensor 8487A Frequency counter 5342A Digital multimeter 3478A Power splitter 11667C Test and Adjustment Module TAM 85629B Cable 50 GHz coax 8120 6164 Cable BNC to SMB 2 required 85680 60093 Cable BNC to BNC 3 required 10503A Cable 36 inch SMA 8120 1578 Cable GPIB 8 required 10833A B 4 megabytes of free memory is required for the adjustment program The software menu shows the 8340 as the synthes...

Page 47: ...nstructions are provided in Chapter 1 Computer Installation of the BASIC Operating Manual For HP 9000 model 310 320 or 350 computers setup information is provided in the Configuration Reference Manual for the Series 300 computers GPIB Cables All GPIB controlled test equipment should be connected to the internal GPIB of the controller select code 7 ...

Page 48: ...tory on your hard disk drive or SRM node For example 8564eadj 3 Download the 8564EC 8565EC Adjustment Diagnostics software from www agilent com find 8560_software 4 Unzip the download file to the directory created in step 2 5 Use the MSI command to change to the mass storage device where the new directory created in step 2 is located For example MSI 700 0 for an HFS system or MSI 21 0 for an SRM s...

Page 49: ...nsor calibration data for the 8487A be sure to also enter a 10 MHz calibration factor The standard 8487A is calibrated only down to 50 MHz but the software uses it down to 10 MHz The calibration data does not have to be entered in frequency order Frequencies may be entered in any order When editing use the arrow keys to get to the entry that you want to edit Use the Backspace key to delete charact...

Page 50: ... may cause damage to the DUT or the TAM NOTE Initial Information must always be run first The WR PROT WR ENA on the A2 controller must be in the WR PROT write protect position 8 Press Select then CONTINUE 9 Enter the power sensor RP numbers last 4 digits of each serial number for the 8482A and 8487A shows 8485A POWER SENSOR on controller screen 10 Enter employee number or any number an entry here ...

Page 51: ...ue required has been entered press DONE 16 Any of the listed adjustments can be selected next Initial Information must always be run first NOTE The 83650A must be in Analyzer mode Check the 83650A user documentation for the correct setting of the rear panel switch For some adjustments the user prompts are displayed on the spectrum analyzer display DUT not the controller display Use the 10 MHz refe...

Page 52: ...iagnostic Software Automated Adjustments Automated Adjustments The following automated adjustments can be performed in any order EXCEPT number one 1 Initial Information This initial information routine must ALWAYS be run first ...

Page 53: ...tware 1 Initial Information 1 Initial Information This Initial Information routine must ALWAYS be run first Carefully follow the instructions and prompts that the software program displays Any of the listed adjustments may be selected next ...

Page 54: ...tup 1 Connect the equipment as shown in Figure 2 1 on page 64 and carefully follow the instructions issued by the software program See Figure 2 2 on page 65 for adjustment locations 2 Observe the upper right hand corner of the spectrum analyzer display while making adjustments Prompts will appear to let you know when the LO frequency is correctly adjusted 3 Whenever this adjustment is performed th...

Page 55: ...Chapter 2 65 Adjustment Diagnostic Software 2 LO Frequency Figure 2 2 LO Frequency Adjustment Locations ...

Page 56: ...Related Performance Tests Frequency Span Accuracy Frequency Readout Accuracy and Frequency Count Marker Accuracy Procedure 1 Connect the CAL OUTPUT to the INPUT 50Ω on the spectrum analyzer being adjusted See Figure 2 3 on page 67 for adjustment locations 2 Carefully follow the instructions issued by the software program ...

Page 57: ...Chapter 2 67 Adjustment Diagnostic Software 3 YTO FM Coil Figure 2 3 YTO FM Coil Adjustment Locations ...

Page 58: ...he 8587A power sensor to the 1 ST LO OUTPUT be sure to use proper adapters Failure to do so will result in damage to the expensive connector of the power sensor NOTE On the DVM Front terminals must be selected or the adjustment program will not run Carefully follow the instructions issued by the software program See Figure 2 4 on page 68 for test connector pin locations Figure 2 4 A14J18 and A14J1...

Page 59: ...1667C power splitter be sure to use proper adapters where necessary Failure to do so will result in damage to the expensive connectors of the power splitter 1 Connect the input port of an 11667C power splitter to the 85650A output 2 Connect one output port of the power splitter through a 20 dB pad to the front panel IF INPUT on the spectrum analyzer 3 Carefully follow the instructions issued by th...

Page 60: ...rmance Test Calibrator Amplitude and Frequency Accuracy Procedure 1 Connect the 8482A power sensor through adapter to the front panel CAL OUTPUT on the spectrum analyzer 2 Carefully follow the instructions issued by the software program 3 If the spectrum analyzer has Option 103 TCXO frequency reference the TCXO will also be adjusted ...

Page 61: ...e software program NOTE This test requires long waiting periods between adjustments Total time required to complete the entire Front End Cal is approximately two 2 hours Make sure that the 10 MHz reference output from the 83650A is connected to the rear panel 10 MHz IN OUT on the spectrum analyzer being adjusted The software program will tell you Waiting for instrument to warm up If the spectrum a...

Page 62: ...embly Related Performance Test Resolution Bandwidth Accuracy and Selectivity Procedure NOTE Use special tuning tool part number 8710 1010 1 Carefully follow the instructions issued by the software program 2 After each adjustment of a component press RECHECK POLE on controller to determine the current DAC value ...

Page 63: ...sted A4 log amp cal oscillator assembly A5 IF assembly Related Performance Tests IF Gain Uncertainty Scale Fidelity Procedure Figure 2 6 IF Amplitude Adjustment Setup 1 Connect equipment as shown in Figure 2 6 on page 75 and carefully follow the instructions issued by the software program ...

Page 64: ...y Procedure NOTE These adjustments need only be done under the following conditions Limiter phase Only if a repair is made to blocks F G H I or J Linear fidelity Only if a repair is made to blocks C D F G H I J K O IF gain accuracy RBW switching or log fidelity Log fidelity Only if a repair is made to blocks D F H K IF gain accuracy RBW switching or log fidelity Figure 2 7 DC Log Adjustment Setup ...

Page 65: ...ustment 1 Connect the 3335A to the INPUT 50Ω of the spectrum analyzer being adjusted 2 Carefully follow the instructions issued by the software program See Figure 2 8 DC Log Adjustment Locations for adjustment locations Figure 2 8 DC Log Adjustment Locations ...

Page 66: ...re 11 Sampling Oscillator 11 Sampling Oscillator Assembly Adjusted A15 RF assembly Related Performance Test There is no related performance test for this adjustment Procedure 1 Carefully follow the instructions issued by the software program ...

Page 67: ...wer when you are done doing diagnostics DAC Control The DAC control program supplies the current DAC value and allows you to set some of the DACs in the spectrum analyzer The recommended instrument state for the spectrum analyzer under test may differ depending on which DAC is selected See Table 2 3 on page 80 for the recommended instrument state 1 To preset state 1 set the spectrum analyzer as fo...

Page 68: ...d Instrument State Intensity DAC A2U212A State 1 Focus DAC A2U212B State 1 LOMA Power DAC A14U601A State 1 LOMA Gate Bias DAC A14U601B State 1 LOMA Sampler Power DAC A14U601C State 1 LOMA SBTX Power DAC A14U601D State 1 YTO Fine DAC A14U301A State 1 YTO Coarse DAC A14U301B State 1 YTF Slope DAC A14U409A State 1 YTF Offset DAC A14U409B State 1 SBTX Bias DAC A14U424A State 1 Sampler Amplifier Gate B...

Page 69: ...ystal 2 Symmetry DAC A5U813D State 1 Crystal 3 Symmetry DAC A5U809D State 1 Crystal 4 Symmetry DAC A5U807D State 1 LC 1 Center Frequency DAC A5U810B State 1 LC 2 Center Frequency DAC A5U810D State 1 LC 3 Center Frequency DAC A5U806B State 1 LC 4 Center Frequency DAC A5U806D State 1 LC 1 Bandwidth DAC A5U810A State 1 LC 2 Bandwidth DAC A5U810C State 1 LC 3 Bandwidth DAC A5U806A State 1 LC 4 Bandwid...

Page 70: ...102B State 1 Log Offset Fine DAC A4U102C State 1 Local Oscillator Tune DAC A4U102D State 1 Refer to steps 1 and 3 of DAC Control for spectrum analyzer state settings unless otherwise noted Table 2 3 DAC Control Recommended Instrument State DAC Reference Designator Recommended Instrument State ...

Page 71: ...nalyzer state you need to EXIT the Display IF CAL Data program and SELECT it again Table 2 4 Latch Control Recommended Instrument State Latch Reference Designator Recommended Instrument State IF Latch 1 A5U808 State 1 IF latch 2 A5U811 State 1 Log Latch 1 A4U103 State 1 Log Latch 2 A4U104 State 1 Log Latch 3 A4U105 State 1 Control 1 Latch A14U313 State 1 Control 2 Latch A14U417 State 1 Scan Time R...

Page 72: ...tion and 8560 E Series Spectrum Analyzer Component Level Information The display on the test spectrum analyzer should be similar to that shown in Figure 2 9 on page 84 Figure 2 9 CAL Oscillator Swept Output 20 kHz Width 2 Use the up down arrows on the controller keyboard to select CF Sweep Width or RF On Off for the cal oscillator 3 Use the left right arrows to change parameters within each select...

Page 73: ...hesizer and the spectrum analyzer RF Diagnostics CAUTION Be sure power to the 8564EC or 8565EC is turned off before connecting the 85629B TAM to the DUT Failure to do so may cause damage to the DUT or the TAM Be sure power to the 8564EC or 8565EC is turned off before connecting the test board part number 08564 69201 Failure to do so may cause damage to the A14 frequency control assembly or some ve...

Page 74: ... 20 conductor ribbon cable part number 8120 5526 3 You will then be prompted to make different connections to the 85629B Test and Adjustment Module TAM a source or spectrum analyzer Connection locations are shown in Figure 2 10 on page 87 and Figure 2 11 on page 88 Carefully follow the instructions on the controller display Read the prompts VERY carefully If a wrong connection is inadvertently mad...

Page 75: ...Chapter 2 87 Adjustment Diagnostic Software To Use the Diagnostics Figure 2 10 Diagnostic Software Connection Locations A14 and A15 ...

Page 76: ...88 Chapter2 Adjustment Diagnostic Software To Use the Diagnostics Figure 2 11 Diagnostic Software Connection Locations RF Section ...

Page 77: ...89 3 Manual Adjustment Procedures ...

Page 78: ...itial Information 2 LO Frequency 3 YTO FM Coil 4 LOMA Adjustments 5 3rd Amp 2nd IF Align 6 Cal Out Adjustment 7 Front End Cal 8 IF Bandpass Poles 9 IF Amplitude 10 DC Log Adjustments 11 Sampling Oscillator Manual Adjustments 1 IF Bandpass Adjustment page110 2 IF Amplitude Adjustments page116 3 DC Log Ampli er Adjustments page121 4 Sampling Oscillator Adjustment page126 5 YTO Adjustment page130 6 C...

Page 79: ...trument with the LINE switch in the off position Before removing or installing any assembly or printed circuit board remove the line power cord Capacitors inside the instrument may still be charged even if the instrument has been disconnected from its source of supply Use a nonmetallic adjustment tool whenever possible Which Adjustments Should Be Performed Table 3 1 on page 93 lists the manual adj...

Page 80: ...llic tuning tool use fiber tuning tool part number 8710 0033 Two different tuning tools may be necessary for IF bandpass adjustments depending upon the type of tuning slug used in the slug tuned inductors If the tuning slug requires a slotted tuning tool use part number 8710 1010 If the tuning slug requires a forked tuning tool use part number 8710 0772 Never try to force an adjustment control Thi...

Page 81: ...ust be replaced also perform the following adjustments LOMA adjustments 4 External mixer amplitude adjustment or 3rd amp 2nd IF align 11 5 Front end cal 7 A3 interface Front end cal 7 A4 log amp cal osc Demodulator adjustment 9 IF amplitude adjustment 2 9 DC log amplifier adjustment 3 10 A5 IF IF bandpass adjustment 1 8 IF amplitude adjustment 2 9 A6 power No related adjustment supply If any autom...

Page 82: ...e performed if the performance test fails 7 A10 A12 Front end cal 7 RYTHM SBTX A11 YTO YTO adjustment 5 LO frequency 2 YTO FM coil 3 A13 2nd converter Front end cal 7 A14 frequency control YTO adjustment 5 LO frequency 2 YTO FM cal 3 Front end cal 7 If any automated adjustment is required you must first perform automated adjustment 1 Initial Information on page 63 Either the manual or the automate...

Page 83: ...r Sampling oscillator adjustment 4 11 A19 GPIB No related adjustment A21 OCXO 10 MHz reference adjustment OCXO 7 If any automated adjustment is required you must first perform automated adjustment 1 Initial Information on page 63 Either the manual or the automated adjustment may be performed Perform either the manual YTO adjustment 5 or the automated LO frequency and YTO FM coil adjustments 2 and ...

Page 84: ...s calibration oscillator output power nominally 35 dBm This power is injected into the IF during the AUTO IF ADJUST routines A5L300 LC CTR 1 3 Adjusts center frequency of first stage of LC bandwidth filter to 10 7 MHz A5L301 LC CTR 2 3 Adjusts center frequency of second stage of LC bandwidth filter to 10 7 MHz A5L700 LC CTR 3 3 Adjusts center frequency of third stage of LC bandwidth filter to 10 7...

Page 85: ...g the sensitivity of the FM coil driver A14R93 3 2 GHz 7 Adjusts the main coil fixed driver current at a YTO frequency of 3 2 GHz near the lower YTO frequency limit A15C100 SMPL MATCH 6 Transforms the sampler input impedance to 50 ohms over the 285 to 297 2 MHz range A15C210 VCO RANGE 6 Adjusts the VCO tank capacitance so that 21V on the VCO tune line equals 298 MHz VCO frequency A15C629 SIG ID 19...

Page 86: ...ed to optimize center frequency of LC tank that loads the crystal A5C326 3 Selected to optimize LC pole center frequency A5C327 3 Selected to optimize LC pole center frequency A5C505 3 Selected to optimize center frequency of LC tank that loads the crystal A5C516 3 Selected to optimize center frequency of LC tank that loads the crystal A5C717 3 Selected to optimize LC pole center frequency A5C718 ...

Page 87: ...es The inductors and transformers are for coarse tuning and the varactors are for fine tuning by the microprocessor The inductors and transformers are adjusted such that the varactor diodes are biased near the middle of their capacitance range The varactor diode bias is measured with the DVM NOTE This procedure is not a routine adjustment It should be performed only if repairs to the A5 IF assembl...

Page 88: ... Disconnect the power cord Remove the spectrum analyzer cover and fold down the A2 controller A3 interface A4 log amp and A5 IF assemblies Reconnect the power cord Turn the spectrum analyzer on and allow it to warm up for at least 30 minutes 2 Connect the negative DVM lead to pin 6 of A5J6 See Figure 3 5 on page 110 and Figure 3 6 on page 112 Set the 3456A controls as follows Function DCVOLTS Rang...

Page 89: ... 6 16 Vdc 100 mV NOTE If the range for the LC CTR adjustment is insufficient replace the appropriate factory selected capacitor as listed in Table 3 4 on page 113 To determine the correct replacement value center the LC CTR adjustment and press ADJ CURR IF STATE After the IF ADJUST STATUS message disappears read the DVM display Choose a capacitor value from Table 3 5 on page 113 based on the DVM r...

Page 90: ...LC CTR 2 A5C327 A5L700 LC CTR 3 A5C717 A5L702 LC CTR 4 A5C718 Table 3 5 LC Factory Selected Capacitor Selection DVM Reading V Currently Loaded Capacitor Value pF Replace Replace Replace Replace Replace Replace Replace 6 8 with 8 2 with 10 with 12 with 15 with 18 with 20 with 0 to 1 5 1 5 to 2 5 18 18 2 5 to 3 5 15 15 18 18 3 5 to 4 5 10 12 15 15 18 4 5 to 5 5 8 2 10 12 15 18 5 5 to 6 5 No change N...

Page 91: ...lue center the XTAL CTR adjustment and press ADJ CURR IF STATE After the IF ADJUST STATUS message disappears read the DVM display Choose a capacitor value from Table 3 7 on page 115 based on the DVM reading and the presently loaded capacitor value Table 3 8 on page 115 lists a few capacitor part numbers CAUTION Turn the spectrum analyzer off by pressing LINE to the off position before removing or ...

Page 92: ... 18 22 24 27 27 4 5 to 5 5 18 20 22 24 27 5 5 to 6 5 No change No change No change No change No change No change 6 5 to 7 5 No change No change No change No change No change No change 7 5 to 8 5 15 18 18 22 24 8 5 to 9 5 15 15 18 20 24 9 5 to 10 15 18 20 24 Indicates a condition that should not exist suspect broken hardware Table 3 8 Capacitor Part Numbers Capacitor Value pF Part Number 6 8 0160 4...

Page 93: ...litude of the reference 15 dB attenuator The output of the A4 log amp cal oscillator is adjusted so that a 55 dBm signal applied to the 10 7 MHz IF input on the A5 IF assembly A5J3 causes a displayed signal of 60 dBm The effect of this adjustment is visible only after the ADJ CURR IF STATE sequence is complete ADJ CURR IF STATE causes the IF gain adjustment to use the new output amplitude from the...

Page 94: ...rocedures 2 IF Amplitude Adjustments Figure 3 7 IF Amplitude Adjustment Setup Equipment Frequency synthesizer 3335A Adapters Type N m to BNC f 1250 1476 Type N f to 2 4 mm f 11903B Cables BNC 122 cm 48 in 10503A Test cable 85680 60093 ...

Page 95: ...spectrum analyzer cover and place the spectrum analyzer in the service position as illustrated in Figure 3 7 IF Amplitude Adjustment Setup on page 117 2 Disconnect W29 violet coax cable from A5J3 Connect the test cable between A5J3 and the 50Ω output of the 3335A Press LINE to turn the spectrum analyzer on 3 On the spectrum analyzer press MKR CAL and IF ADJ ON OFF so OFF is underlined 4 Set the 33...

Page 96: ... If markers are displayed press MKR and MARKERS OFF 11 Set the 3335A AMPLITUDE to 60 dBm 12 Connect a BNC cable between the 50Ω output of the 3335A and the spectrum analyzer INPUT 50Ω 13 On the spectrum analyzer press CAL and REF LVL ADJ Use the front panel knob or step keys to place the peak of the displayed signal 3 dB to 5 dB below the reference level 14 Press PEAK SEARCH and MARKER DELTA on th...

Page 97: ...5 The MARKER amplitude should read 10 dBm 0 13 dB If the reading is outside of this range repeat steps 4 through 21 26 On the spectrum analyzer reconnect W29 to A5J3 Press PRESET and set the controls as follows Center frequency 300MHz Span 0Hz Reference level 10dBm Resolution bandwidth 300kHz 27 Connect a BNC cable between the 8563E CAL OUTPUT and INPUT 50Ω 28 On the spectrum analyzer press MKR CA...

Page 98: ...Description These three adjustment need only be done under the following conditions Limiter phase Only if a repair is made to blocks F G H I or J Linear fidelity Only if a repair is made to blocks C D F G H I J K O IF gain accuracy RBW switching or log fidelity Log fidelity Only if a repair is made to blocks D F H K IF gain accuracy RBW switching or log fidelity If multiple adjustments are require...

Page 99: ...Procedures 3 DC Log Amplifier Adjustments Figure 3 9 DC Log Adjustment Setup Equipment Frequency synthesizer 3335A Adapters Type N m to BNC f 1250 1476 Type N f to 2 4 mm f 11903B Cables BNC 122 cm 48 in 10503A Test cable 85680 60093 ...

Page 100: ...e spectrum analyzer off Remove the spectrum analyzer cover and place the spectrum analyzer in the service position as illustrated in Figure 3 9 on page 122 See Figure 3 10 on page 123 for adjustment location 2 Connect the 3335A 50Ω output to the spectrum analyzer 50Ω input Press LINE to turn the spectrum analyzer on 3 Set the spectrum analyzer controls as follows Center frequency 15 MHz Span 0 Ref...

Page 101: ... 3335A input power to 58 dBm 6 If the delta marker amplitude reads 40 dB 2 dB no adjustment is necessary 7 If the signal is lower on the screen than expected delta marker amplitude reads less than 42dB then adjust A4R544 see Figure 3 10 on page 123 for an even lower level and press CAL ADJ CURR IF STATE Allow sufficient time for the analyzer to complete the adjustment 8 If the signal is higher on ...

Page 102: ... 6 Press MKR MARKER DELTA on the spectrum analyzer 7 Decrease the 3335A power to 26 dBm 8 Calculate the error EQUATION rm Error rm delta marker reading rm 16 dB EQUATION 9 If the error is less than 0 2 dB no adjustment is necessary 10 Set the 3335A power to 10 dBm 11 Adjust A4R531 see Figure 3 10 DC Log Adjustment Locations to read two times the error For example if the calculated error is 0 75 dB...

Page 103: ...nt procedure Description The sampling oscillator tank circuit is adjusted for a tuning voltage of 5 05 V dc when the sampling oscillator is set to 297 222 MHz The voltage monitored is actually the tuning voltage divided by 4 05 The setting is then checked at other frequencies for the full tuning range of the sampling oscillator Figure 3 11 Sampler Adjustment Setup Equipment Digital voltmeter 3456A...

Page 104: ... power cord and press LINE to turn the spectrum analyzer on Connect the equipment as illustrated in Figure 3 11 on page 126 2 Press PRESET on the spectrum analyzer and set the controls as follows Center frequency 2126MHz Span 0Hz 3 Set the 3456A controls as follows Function DCVOLTS Range 10V MANUAL Sampling Oscillator Adjustment 1 Connect the negative DVM test lead to A15J200 pin 6 Connect the pos...

Page 105: ...d frequency record the displayed voltage in the table 6 If the difference between the maximum and minimum voltages is less than 0 50 V and all voltage readings are between 0 5 and 2 5 Vdc proceed to step 15 7 Locate the center frequency at which the voltage is lowest Use the keypad to set the spectrum analyzer to this frequency 8 Readjust SMPL MATCH to set the displayed voltage to 0 8 0 1 Vdc 9 Se...

Page 106: ...3 129 Manual Adjustment Procedures 4 Sampling Oscillator Adjustment 2196 3 295 000 2378 3 296 471 2422 3 297 222 Table 3 9 Sampling Adjustments Center Frequency MHz Sampling Oscillator MHz Displayed Voltage Vdc ...

Page 107: ...y Readout Accuracy and Frequency Count Marker Accuracy Description The YTO main coil adjustments are made with the phase lock loops disabled The YTO endpoints are adjusted to bring these points within the capture range of the main loop The YTO FM coil is adjusted to place the 300 MHz CAL OUTPUT signal at the center vertical graticule in a 20 MHz span Figure 3 13 YTO Adjustment Setup ...

Page 108: ... 50Ω termination from the 1ST LO OUTPUT Connect the equipment as shown in Figure 3 13 on page 130 Press LINE to turn the spectrum analyzer on 3 Move the jumper on A14J23 from the NORM position pins 1 and 2 jumpered to the TEST position pins 2 and 3 jumpered See Figure 3 14 YTO Adjustment Locations on page 132 for the location on the A14 frequency control assemblies 4 On the spectrum analyzer press...

Page 109: ...ter reading of 3 200 GHz 1 MHz 7 On the spectrum analyzer press STATE 1 8 Adjust A14R42 6 01 GHz for a frequency counter reading of 6 010 GHz 1 MHz 9 On the spectrum analyzer press STATE 0 10 Repeat steps 6 through 9 until both of these interacting adjustments meet their tolerances Figure 3 14 YTO Adjustment Locations ...

Page 110: ...ect the SMA cable from the 1ST LO OUTPUT jack and reconnect the 50Ω termination on the 1ST LO OUTPUT YTO FM Coil Adjustments 13 On the spectrum analyzer press PRESET and set the controls as follows Center frequency 300MHz Span 20MHz 14 Adjust A14R76 FM SPAN until the 300 MHz CAL OUTPUT SIGNAL is aligned with the center vertical graticule line ...

Page 111: ...ssembly Related Performance Test Calibrator Amplitude and Frequency Accuracy Description The CAL OUTPUT amplitude is adjusted for 10 00 dBm measured directly at the front panel CAL OUTPUT connector Figure 3 15 Calibrator Amplitude Adjustment Setup Equipment Measuring receiver 8902A Power sensor 8482A Adapters Type N f to BNC m 1250 1477 ...

Page 112: ...alyzer in the service position shown in Figure 3 15 on page 134 Prop the A14 frequency control board assembly in the service position 2 Zero and calibrate the 8902A 8482A combination in log display mode Enter the power sensor 300 MHz cal factor into the 8902A 3 Connect the 8482A through an adapter directly to the spectrum analyzer CAL OUTPUT connector 4 Adjust A15R561 CAL AMPTD for a 10 00 dBm rea...

Page 113: ...ccuracy Description The frequency of the internal 10 MHz frequency reference is compared to a known frequency standard and adjusted for minimum frequency error This procedure does not adjust the short term stability or long term stability of the A21 10 MHz ovenized crystal oscillator OCXO Stability is determined by the characteristics of the particular oscillator and the environmental and warmup c...

Page 114: ... Procedures 7 10 MHz Reference Adjustment OCXO Figure 3 16 10 MHz Reference Adjustment Setup and Adjustment Location Equipment Frequency counter 5334A B Frequency standard 5061B Cesium Beam Standard Cable BNC 122 cm 2 required 10503A ...

Page 115: ...ng or warmed up c Connect the frequency standard to the frequency counter rear panel TIMEBASE IN OUT connector d Connect a BNC cable between the spectrum analyzer rear panel 10 MHz REF IN OUT connector and INPUT A on the frequency counter 2 Set the frequency counter controls as follows Function data FREQA Input A 10 Attenuator OFF AC OFF DC coupled 50ΩZ OFF 1 MΩ input impedance Auto Trigger ON 100...

Page 116: ...unter select a 10 second gate time by pressing GATE TIME 10 GATE TIME The frequency counter should now display the difference between the frequency of the INPUT A signal and 10 0 MHz with a resolution of 0 001 Hz 1 mHz 9 Wait at least two gate periods for the frequency counter to stabilize then adjust the FREQ ADJ control on A21 OCXO for a stable frequency counter reading of 0 000 Hz 0 010 Hz 10 R...

Page 117: ...ance Test 10 MHz Reference Output Accuracy Option 103 Description The frequency counter is connected to the analyzer CAL OUTPUT The CAL OUTPUT is locked to the 10 MHz frequency reference which yields better effective resolution The temperature compensated crystal oscillator TCXO is adjusted for a frequency counter reading of 300 MHz Figure 3 17 10 MHz Reference Adjustment Setup TCXO ...

Page 118: ... 140 Prop up the A14 frequency control assembly 2 Set the frequency counter controls as follows Sample rate Midrange 50Ω 1 MΩ switch 50Ω 10 Hz 500 MHz 500 MHz 26 5 GHz switch 10 Hz 500 MHz 3 Press AUX CTRL REAR PANEL Verify that the 10 MHz reference is set to 10 MHz INT NOTE When the 10 MHz reference is set to 10 MHz EXT the TCXO is not operating and warmed up If the reference is set to 10 MHz EXT...

Page 119: ...illator assembly Related Performance Test There is no related performance test for this adjustment Description A 5 kHz peak deviation FM signal is applied to the INPUT 50Ω The detected audio is monitored by an oscilloscope FM DEMOD is adjusted to peak the response displayed on the oscilloscope Figure 3 18 Demodulator Adjustment Setup ...

Page 120: ...n as illustrated in Figure 3 18 on page 142 2 Connect the oscilloscope probe from the oscilloscope channel 1 input to probe A4C723 the end closest to A4U707 as in Figure 3 19 on page 144 Press LINE to turn the spectrum analyzer on Connect the 8640B RF OUTPUT to the spectrum analyzer INPUT 50Ω 3 Set the 8640B controls as follows Range MHz 61 to 128 Frequency 100 000MHz Output level 10dBm RF ON AM O...

Page 121: ...7 On the spectrum analyzer press PEAK SEARCH MARKER CF SPAN ZERO SPAN AUX CTRL AM FM DEMOD FM DEMOD ON OFF ON CAL IF ADJ ON OFF OFF TRIG and SWEEP CONT SGL SGL Set the volume control to midrange 8 A 1 kHz sine wave should be observed on the oscilloscope Rotate the volume knob on the front panel of the spectrum analyzer until the amplitude of the 1 kHz signal is at about 150 mV 3 divisions on the o...

Page 122: ... no related performance test for this adjustment Description A voltmeter is connected to the spectrum analyzer IF INPUT with the external mixer bias set to off The bias is adjusted for a 0 Vdc output Figure 3 20 External Mixer Bias Adjustment Setup Equipment DVM 3456A Adapters Type BNC f to SMA m 1250 1200 Type BNC f to dual banana plug 1251 2816 Cables BNC 122 cm 48 in 10503A ...

Page 123: ...lyzer cover and connect the equipment as illustrated in Figure 3 20 on page 145 Fold down the A15 RF assembly Reconnect the power cord and set the LINE switch to on 2 Set the 3456A controls as follows Function DCVOLTS Range 0 1V Resolution 100mV 3 On the spectrum analyzer press AUX CTRL EXTERNAL MIXER BIAS then BIAS OFF 4 Adjust A15R926 EXT BIAS ZERO for a DVM reading of 0 000 Vdc 12 5 mV ...

Page 124: ... compensation amplifiers is determined The user loaded conversion losses for K band are recorded and reset to 30 dB A 310 7 MHz signal is applied to the power sensor and the power level of the source is adjusted for a 30 dBm reading The signal is then applied to the IF INPUT The flatness compensation amplifiers are then adjusted via DACs to place the displayed signal at the reference level Figure ...

Page 125: ...yzer cover and reconnect the power cord 2 Set up the equipment as illustrated in Figure 3 21 on page 147 Do not connect the SMA cable to the spectrum analyzer 3 Move the WR PROT WR ENA jumper on the A2 controller assembly to the WR ENA position The jumper is on the edge of the A2 board assembly and can be moved without folding the board down 4 Press LINE to turn the spectrum analyzer on On the spe...

Page 126: ...nd calibrate the 8902A 8481D combination in log mode Enter the power sensor 50 MHz cal factor into the 8902A Connect the power sensor through an adapter to the SMA cable 9 Adjust the 8340A B POWER LEVEL until the power displayed on the 8902A reads 30 dBm 0 05 dB 10 On the spectrum analyzer press CAL MORE 1 OF 2 SERVICE CAL DATA 3RD IF AMP then CAL 3RD AMP GAIN 11 Wait until the message ADJUSTMENT ...

Page 127: ...formed if you need to replace the 30 dB conversion loss values to those recorded in Table 3 10 on page 149 16 Press AUX CTRL EXTERNAL MIXER AMPTD CORRECT then CNV LOSS VS FREQ on the spectrum analyzer 17 Press or to select frequencies where the conversion loss value was recorded in Table 3 10 on page 149 18 Use the spectrum analyzer front panel keys to enter the conversion loss values recorded for...

Page 128: ...n the A15 RF and A14 frequency control assemblies Prop up the A14 frequency control assembly 2 Disconnect W33 gray brown coax cable from A15J701 3 Connect the signal at A15J701 to the input of the 8566A B spectrum analyzer 4 Reconnect the power cord and press LINE to turn the spectrum analyzer on 5 Set the center frequency of the 8566A B to 600 MHz and set the frequency span and resolution bandwid...

Page 129: ...161 3a Manual Adjustment Procedures 3335A Source not Available ...

Page 130: ... adjustment of the spectrum analyzer that do not require the use of the 3335A Synthesizer Level Generator The 3335A has been discontinued Because of the unavailability of the 3335A new adjustments procedures are required that use different signal sources If the 3335A is not available substitute these procedures for those of the same number found in Chapter 3 Manual Adjustment Procedures ...

Page 131: ...ubstitution Recommended Model Sources Synthesized Signal Generator Frequency range 250 kHz to 3 GHz Frequency resolution 1 Hz Attenuator resolution 0 02 dB Level accuracy 0 5 dB External 10 MHz Ref Input E4421B or E4422B E4432B E4433B Cables Cable 50 Ω coaxial four required Connectors BNC m Length 122 cm 48 in 10503A Cable Test Cable 85680 60043 Adapters Adapter four required Type N m to BNC f 125...

Page 132: ...of the reference 15 dB attenuator The output of the A4 log amp cal oscillator is adjusted so that a 55 dBm signal applied to the 10 7 MHz IF input on the A5 IF assembly A5J3 causes a displayed signal of 60 dBm The effect of this adjustment is visible only after the ADJ CURR IF STATE sequence is complete ADJ CURR IF STATE causes the IF gain adjustment to use the new output amplitude from the A4 log...

Page 133: ...ment Locations NOTE The 15 dB reference attenuator adjustment is preset at the factory and need not be done if the entire A5 IF assembly is replaced Procedure 1 Press LINE to turn the spectrum analyzer off Remove the spectrum analyzer cover and place the spectrum analyzer in the service position as illustrated in Figure 3a 1 2 Disconnect W29 violet coax cable from A5J3 Connect the test cable betwe...

Page 134: ...r every 0 1 dB less than 60 dBm See Figure 3a 2 for the location of A4R826 A change in the displayed amplitude will not be seen until ADJ CURR IF STATE is pressed 8 If the marker reads greater than 59 9 dBm rotate A4R826 CAL OSC AMPTD one third turn counter clockwise for every 0 1 dB greater than 60 dBm See Figure 3a 2 for the location of A4R826 A change in the displayed amplitude will not be seen...

Page 135: ...49 9 dB rotate A5R343 15 dB ATTEN one half turn counterclockwise for each 0 1 dB less than 50 00 dB Do not adjust A5R343 more than five turns before continuing with the next step 10 If the MKR amplitude is greater than 50 1 dB rotate A5R343 15 dB ATTEN one half turn clockwise for each 0 1 dB greater than 50 00 dB Do not adjust A5R343 more than five turns before continuing with the next step 11 On ...

Page 136: ...ntrols as follows Center frequency 300 MHz Span 0 Hz Reference level 10 dBm Resolution bandwidth 300 kHz 7 Connect a BNC cable between the 8563E CAL OUTPUT and INPUT 50Ω 8 On the spectrum analyzer press MKR CAL and REF LVL ADJ 9 Use the knob or step keys to adjust the REF LEVEL CAL setting until the MKR reads 10 00 dBm 0 1 dB 10 On the spectrum analyzer press STORE REF LVL ...

Page 137: ...Scale Fidelity Description These three adjustment need only be done under the following conditions Limiter phase Only if a repair is made to blocks F G H I or J Linear fidelity Only if a repair is made to blocks C D F G H I J K O IF gain accuracy RBW switching or log fidelity Log fidelity Only if a repair is made to blocks D F H K IF gain accuracy RBW switching or log fidelity If multiple adjustme...

Page 138: ...35A Source not Available 3a DC Log Amplifier Adjustments Figure 3a 3 DC Log Adjustment Setup Equipment Signal Generator E4421B Adapters Type N m to BNC f 1250 1476 Type N f to 2 4 mm f 11903B Cables BNC 122 cm 48 in 10503A Test cable 85680 60093 ...

Page 139: ...1 Press LINE to turn the spectrum analyzer off Remove the spectrum analyzer cover and place the spectrum analyzer in the service position as illustrated in Figure 3a 3 See Figure 3a 4 for adjustment location 2 Connect the E4421B RF output to the spectrum analyzer 50Ω input Press LINE to turn the spectrum analyzer on 3 Set the spectrum analyzer controls as follows Center frequency 15 MHz Span 0 Hz ...

Page 140: ...1B RF output to the spectrum analyzer 50Ω input Press LINE to turn the spectrum analyzer on 3 On the spectrum analyzer press PRESET AMPLITUDE LINEAR MORE 1 of 3 AMPTD UNITS dBm CAL and IF ADJ ON OFF OFF 4 Set the spectrum analyzer controls as follows Center frequency 15 MHz Span 5 MHz Resolution bandwidth 300 kHz Reference level 10 dBm 5 Set up an E4421B as follows Frequency 15 MHz Amplitude 10 dB...

Page 141: ...he spectrum analyzer 50Ω input Press LINE to turn the spectrum analyzer on 3 On the spectrum analyzer press PRESET CAL IF ADJ ON OFF OFF and ADJ CURR IF STATE 4 Set the spectrum analyzer controls as follows Center frequency 15 MHz Span 0 MHz Resolution bandwidth 300 kHz Reference level 10 dBm 5 Set up an E4421B as follows Frequency 15 MHz Amplitude 10 dBm Mod On Off Off 6 On the spectrum analyzer ...

Page 142: ...175 4 Assembly Replacement ...

Page 143: ...and Mixer page 223 A9 Input Attenuator page 224 A10 A12 RYTHM SBTX page 227 A11 YTO page 228 A13 Second Converter page 230 Procedure 8 A14 and A15 Assemblies page 231 Procedure 9 B1 Fan page 237 Procedure 10 BT1 Battery page 238 Procedure 11 Rear Frame Rear Dress Panel page 239 Procedure 12 EEROM page 254 Procedure 13 A21 OCXO page 256 Tools required to perform the procedures are listed in Table 4...

Page 144: ...he spectrum analyzer right side frame using hinges and fold out of the spectrum analyzer allowing access to all major assemblies See Figure 4 1 on page 179 To remove the spectrum analyzer cover assembly refer to Procedure 1 Spectrum Analyzer Cover To access the A2 A3 A4 and A5 assemblies refer to Procedure 5 A2 A3 A4 and A5 Assemblies To access the A14 and A15 assemblies refer to Procedure 8 A14 a...

Page 145: ...quired Tools Description Part Number 5 16 inch open end wrench 8720 0015 3 mm hex Allen wrench 8710 1366 4 mm hex Allen wrench 8710 1164 17 mm socket wrench T362609 No 4 hex Allen wrench 5020 0288 No 6 hex Allen wrench 5020 0289 7 mm nut driver 8710 1217 3 8 inch nut driver 8720 0005 7 16 inch nut driver 8720 0006 9 16 inch nut driver drilled out end covered 8720 0008 with heatshrink tubing Small ...

Page 146: ...on to avoid damaging any cables 3 When installing the cover assembly be sure to locate the cover air vent holes on the bottom side of the spectrum analyzer Attach with the four screws loosened in step 2 and tighten the four screws gradually to ensure that the cover is seated in the front frame gasket groove 4 Torque each screw to 40 to 50 inch pounds to ensure proper gasket compression to minimize...

Page 147: ... controller board a Ribbon cable W60 which connects J8 on the A2 controller board with J1 on the A17 display driver board b W61 which connects J9 on the A2 controller board with J7 on the A17 display driver board 6 Disconnect ribbon cable W64 from the J1 VGA port on the rear panel do not disconnect W64 from the A17 display driver board 7 Disconnect the W3 line switch cable from the power supply a ...

Page 148: ...cure the volume knob to the face of the front panel If necessary use a 5 16 inch nut driver to drill out the nut which secures the VOLUME potentiometer assembly Cover the tip with heatshrink tubing or tape to avoid scratching the enameled front panel b CAL OUTPUT connector Use a 9 16 inch nut driver to remove the dress nut that holds the front panel CAL OUTPUT connector to the front panel If neces...

Page 149: ...rd to J1 on the rear panel b W63 a ribbon cable that connect J5 on the A17 display driver board with the LCD 4 If you want to remove the A17A1 inverter board proceed to step a If you intend to keep the A17A1 inverter board secured to the A17 display driver board proceed to step 4 a Remove the two screws 0515 0430 which secure the A17A1 inverter board to standoffs on the A17 display driver board b ...

Page 150: ...er Board Inverter Board and LCD on page 182 2 Remove each backlight cable assembly 2090 0380 Carefully grasp the end of the metal backlight assembly which is connected to the backlight cable and pull the backlight out from its slot The backlight cable slots are located at the top and at the bottom of the LCD NOTE Whenever there is a need to replace a single backlight both backlights must be replac...

Page 151: ...184 Chapter4 Assembly Replacement Procedure 2 A1 Front Frame A18 LCD Figure 4 2 LCD Assembly Exploded View ...

Page 152: ...15 assemblies will lie to your right 3 Fold out the A2 A3 A4 and A5 assemblies as described in steps 2 through 6 under Procedure 5 A2 A3 A4 and A5 Assemblies Facing the front panel the A2 A3 A4 and A5 assemblies will lie to your left 4 Place the A1 front frame assembly in the chassis of the instrument a Position the A1 front frame assembly in the chassis b Insert the three screws 0515 1101 that se...

Page 153: ...itch cable from the right side of the instrument through the opening behind FL 1 to the power supply on the left side of the instrument a Loosen the two screws 0515 2332 that secure FL 1 to the instrument s chassis b Route the W3 line switch cable from the right side of the instrument to the left side through the opening that can now be accessed since FL 1 has been loosened If the opening is still...

Page 154: ... Make sure that the side of the glass which has a broad silver border the left side when facing the front of the display is inserted into the side of the mount that has larger brackets into which the glass plate will slide NOTE The glass plate was originally placed in the LCD assembly in a clean room environment to ensure optimal performance of the LCD display Take all possible precautions to ensu...

Page 155: ...15 0430 that secure the A17A1 inverter board to the standoffs on the A17 display driver board 10 Reconnect ribbon cable W63 which connects the A18 LCD with J5 on the A17 display driver board 11 Connect the two backlight cables from the A18 LCD to the two slotted connectors on the A17A1 inverter board 12 Route W64 the VGA cable from J1 on the rear panel through the rectangular opening in the displa...

Page 156: ...n page 187 to complete replacement of the LCD into the front panel Follow the instructions in Replacement of the Front Frame on page 185 to replace the front panel in the front frame Replacement of the Line Switch After you have replaced the A1 front frame assembly you can replace the line switch by following these steps note that the line switch must be replaced before the LCD and display driver ...

Page 157: ...nt Procedure 2 A1 Front Frame A18 LCD 3 Connect the power probe cable to the connector that is labelled probe power on the front frame PC board 4 Connect A1A1W1 from HDR1 on A1 front frame assembly to A3J602 on the A3 interface board ...

Page 158: ...ll the rubber keypad ensuring that the screw holes are visible through the pad 2 Place the A1A1 keyboard assembly over the rubber keypad Secure with nine panhead screws 3 Connect the RPG cable to A1A1J2 and A1W1 to A1A1J3 4 Install the front frame assembly For 8564EC and 8565EC instruments follow the instructions in Procedure 2 A1 Front Frame A18 LCD 2 Disconnect A1W1 from A1A1J3 and the RPG cable...

Page 159: ...Use a 7 16 inch nut driver set to 20 in lbs to remove the nut holding the RPG shaft to the front panel 5 Remove the RPG Replacement 1 Place the RPG into the front frame with the cable facing the bottom of the spectrum analyzer Place a lock washer and nut on the RPG shaft to hold it in the frame 2 Use a 7 16 inch nut driver to secure the RPG assembly to the front frame 3 Connect the RPG cable to A1...

Page 160: ...at a time Always fold the A2 and A3 assemblies as a unit and the A4 and A5 assemblies as a unit Folding out one assembly at a time binds the hinges attaching the assemblies and may damage an assembly and hinge 5 The board assemblies are attached to the right side frame of the spectrum analyzer with two hinges Fold both the A2 and A3 assemblies out of the spectrum analyzer as a unit 6 Fold both the...

Page 161: ...he assembly being installed to the two chassis hinges with two panhead screws 3 Leave the assembly in the folded out position and attach ribbon cables W1 and W2 4 Attach all cables to the assembly as illustrated in Figure 4 9 on page 204 5 Locate the cable clip on the inside of the right side frame Make sure that the coaxial cables are routed properly on the clip as illustrated in Figure 4 12 on p...

Page 162: ...ent Procedure 5 A2 A3 A4 and A5 Assemblies 6 Lay the A2 A3 A4 and A5 assemblies flat against each other in the folded out position Make sure that no cables become pinched between the two assemblies Figure 4 9 Assembly Cables 1 of 3 ...

Page 163: ...Chapter 4 205 Assembly Replacement Procedure 5 A2 A3 A4 and A5 Assemblies Figure 4 10 Assembly Cables 2 of 3 ...

Page 164: ...apter4 Assembly Replacement Procedure 5 A2 A3 A4 and A5 Assemblies Figure 4 12 Coaxial Cable Clip 7 Check to ensure that no cables will become pinched under the hinges when folding up the A4 and A5 assemblies ...

Page 165: ...s a unit into the spectrum analyzer Be sure to fold GPIB cable A19W1 between the A3 and A4 assemblies using the two sets of hook and loop Velcro fasteners 10 Fold ribbon cable A1A1W1 between A3 and A4 assemblies Take care to dress the protective tubing as close to A3J602 connector as possible so that the tubing does not fold with the cable See Figure 4 14 on page 208 11 Attach ribbon cable W4 to A...

Page 166: ...208 Chapter4 Assembly Replacement Procedure 5 A2 A3 A4 and A5 Assemblies Figure 4 14 GPIB and A1A1 W1 Cable Placement ...

Page 167: ...ssembly Refer to Procedure 1 Spectrum Analyzer Cover 3 Fold out the A2 A3 A4 and A5 assemblies as described in steps 2 through 6 under Procedure 5 A2 A3 A4 and A5 Assemblies 4 Place the spectrum analyzer on the workbench with A2 A3 A4 and A5 folded out to the right 5 Remove the three screws securing the power supply shield to the power supply and remove the shield See Figure 4 16 on page 211 6 Dis...

Page 168: ...210 Chapter4 Assembly Replacement Procedure 6 A6 Power Supply Assembly Figure 4 15 Power Supply Cover ...

Page 169: ... to A6J4 and the line power jack to A6J101 See Figure 4 17 on page 214 4 Ensure that all cables are safely routed and will not be damaged when securing the A6 cover 5 Secure the power supply cover shield to the power supply using three flathead screws 1 See Figure 4 16 on page 211 One end of the cover fits into a slot provided in the rear frame assembly Ensure that the extended portion of the cove...

Page 170: ...ribed in Procedure 8 A14 and A15 Assemblies 2 If the A9 input attenuator A11 YTO or A10 A12 RYTHM SBTX assembly is being removed also fold down the A2 A3 A4 and A5 assemblies as described in Procedure 5 A2 A3 A4 and A5 Assemblies Use Figure 4 20 on page 221 to locate the assemblies and cables called out in this procedure NOTE Use a torque wrench to tighten all SMA connectors to 113 Ncm 10 in lb pa...

Page 171: ...Chapter 4 221 Assembly Replacement Procedure 7 A7 through A13 Assemblies Figure 4 20 8564ECand 8565EC Assembly Locations ...

Page 172: ... A7 assembly 3 Remove W12 from the A7 assembly two ribbon cable connectors and ground lug 4 Remove the A7 assembly Replacement 1 Use a 5 16 inch wrench to attach W46 W28 W39 W42 W30 and W38 to the A7 assembly 2 Connect cable W12 both ribbon cable connectors to the A7 assembly 3 Use two panhead screws to secure A7 to the center deck Be sure to attach the ground lug on the screw near the J5 SAMPLER ...

Page 173: ...ws to secure A8 to the center deck Reconnect W45 to FL1 and A8J1 or AT1 4 Torque all semirigid coax connections on A8 FL1 and AT1 if present to 113 Ncm 10 in lb Ensure that all cable connections are tight 5 Connect W15 to A8 Use a 5 16 inch wrench to remove W45 between FL1 and AT1 For Option 006 remove W45 between FL1 and A8J1 3 Loosen W47 and W39 at A8J2 and A8J3 4 Remove the two screws securing ...

Page 174: ...lace the spectrum analyzer upside down on the work bench 2 Disconnect W16 ribbon cable from the A10 A12 assembly and move it out of the way 3 Remove screw 1 and the cable clamp securing FL3 to the attenuator mounting bracket See Figure 4 21 on page 224 Figure 4 21 A9 Attenuator Removal ...

Page 175: ...s the attenuator to the center deck is attached to the attenuator For proper orientation of the attenuator when mounting the bracket refer to Figure 5 4 in chapter 5 2 Connect the attenuator control ribbon cable to the A9 input attenuator 3 Loosely connect semirigid cable W43 to the attenuator assembly See Figure 4 21 on page 224 4 Loosely connect semirigid cable W41 to the front panel RF INPUT co...

Page 176: ...226 Chapter4 Assembly Replacement A9 Input Attenuator Figure 4 22 A9 and A10 A12 Mounting Screws ...

Page 177: ...sembly 5 Remove four screws 1 securing A10 A12 to the center deck These screws are located on the top side of the center deck as illustrated in Figure 4 22 A9 and A10 A12 Mounting Screws 6 Carefully remove the A10 A12 assembly and disconnect W48 gray cable Replacement 1 Orient the A10 A12 assembly for the proper cable connections 2 Connect W48 gray cable to the A10 A12 assembly beneath where W46 c...

Page 178: ...while holding onto A11 4 Disconnect W10 ribbon cable from the A11 YTO assembly Replacement 1 Connect W10 ribbon cable to the A11 YTO assembly 2 Orient the A11 assembly in the spectrum analyzer so its four mounting holes line up with the holes in the right side frame and the output connector is lined up with W38 3 Secure the A11 assembly to the right side frame using four screws 4 Connect W38 to A1...

Page 179: ...Chapter 4 229 Assembly Replacement A11 YTO Figure 4 23 A11 Mounting Screws at Right Side Frame ...

Page 180: ...m A13J3 4 Disconnect W56 FL2 W57 as a unit and set it aside 5 Remove the four screws securing A13 to the main deck and remove the assembly 6 Disconnect ribbon cable W13 from the A13 assembly Replacement 1 Connect ribbon cable W13 to the A13 assembly 2 Secure A13 to the spectrum analyzer main deck using four panhead screws 3 Connect W33 coax 81 to A13J4 600 MHz IN jack 4 Connect W35 coax 92 to A13J...

Page 181: ... 1 Remove the spectrum analyzer cover as described in Procedure 1 Spectrum Analyzer Cover 2 Place the spectrum analyzer on its right side frame 3 Remove the eight screws 1 holding the A14 and A15 assemblies to the bottom of the spectrum analyzer See Figure 4 24 on page 231 Figure 4 24 A14 and A15 Assembly Removal ...

Page 182: ...inch pounds Applying excessive torque will cause the screws to stretch Replacement 1 Attach the removed assembly to the two chassis hinges with two panhead screws 2 Attach all cables to the assembly as illustrated in Figure 4 25 on page 233 When connecting W34 to A15 torque the SMA connector to 113 Ncm 10 in lb 3 Lay the A14 and A15 assemblies flat against each other in the folded out position Mak...

Page 183: ...Chapter 4 233 Assembly Replacement Procedure 8 A14 and A15 Assemblies Figure 4 25 A14 and A15 Assembly Cables ...

Page 184: ...jury 1 Remove the four screws securing the fan assembly to the rear frame 2 Remove the fan and disconnect the fan wire from the A6 power supply assembly 3 To reinstall the fan connect the fan wire to A6J3 and place the wire into the channel provided on the left side of the rear frame opening Secure the fan to the rear frame using four panhead screws NOTE The fan must be installed so that the air e...

Page 185: ...voltage will deteriorate quickly When the instrument is turned off stored states and traces will only be retained for a short time and may be lost Refer to State and Trace Storage Problems in Chapter 10 Controller Section The battery should be replaced if its voltage is 2 6 V or less Removal Replacement 1 Remove any option module attached to the rear panel 2 Locate the battery assembly cover on th...

Page 186: ...nning this replacement procedure Failure to follow this precaution can present a shock hazard which may result in personal injury 1 Disconnect the line power cord from the spectrum analyzer 2 Remove the spectrum analyzer cover and place the spectrum analyzer on its right side frame 3 Fold out the A2 A3 A4 and A5 assemblies as described in Procedure 5 A2 A3 A4 and A5 Assemblies steps 3 through 5 4 ...

Page 187: ...nnectors to the rear frame If necessary drill out the nut driver to fit over the BNC connectors and cover it with heatshrink tubing or tape to avoid scratching the dress panel 10 Remove four screws that secure the rear frame to the main deck See 1 in Figure 4 28 on page 241 11 Remove the six screws that secure the rear frame to the left and right side frames 12 Remove the knurled nut that secures ...

Page 188: ...ame area 3 Place the rear frame on the spectrum analyzer and secure the knurled nut on the earphone jack A lock washer should be used on the inside of the rear frame and a flat washer on the outside 4 Place the coax cable s BNC connectors into the appropriate rear frame holes as described below Use a 9 16 inch nut driver to attach the dress nuts holding the BNC connectors to the rear frame Rear Pa...

Page 189: ...ositive lug and the black wire to the negative lug Replace the battery 9 Secure the battery assembly to the rear frame using two flathead screws 10 Connect the fan and line power cables to A6J3 and A6J101 on the A6 power supply 11 Ensure that all cables are safely routed and will not be damaged when securing the A6 cover 12 Secure the power supply cover shield to the power supply using three flath...

Page 190: ...Chapter 4 243 Assembly Replacement Procedure 11 Rear Frame Rear Dress Panel Figure 4 29 A6 Power Supply Cover ...

Page 191: ...into the program RAM 5 Using a nonmetallic tool carefully remove the defective EEROM 6 Carefully install a new EEROM 7 Press COPY TO EEROM The spectrum analyzer will store the contents of the program RAM into the new EEROM 8 Turn the spectrum analyzer LINE switch off then on cycling the power Allow the power on sequence to finish 9 If error message 701 702 or 703 is displayed press RECALL MORE and...

Page 192: ... power the EEROM is working properly but the frequency response correction data might be invalid Check the spectrum analyzer frequency response 14 Place the WR PROT WR ENA jumper in the WR PROT position 15 Fold the A2 and A3 assemblies into the spectrum analyzer as described in Procedure 5 A2 A3 A4 and A5 Assemblies ...

Page 193: ...frame 3 Fold out the A14 and A15 assemblies as described in Procedure 9 A14 and A15 Assemblies Removal steps 3 and 4 4 Remove the three screws 1 securing the OCXO to the main deck See Figure 4 34 A21 OCXO Mounting Screws 5 Disconnect W49 coax 82 from the OCXO and disconnect W50 orange cable from the A15 RF assembly Clip the tie wraps that hold W49 and W50 together and remove the OCXO from the spec...

Page 194: ...Chapter 4 257 Assembly Replacement Procedure 13 A21 OCXO Figure 4 34 A21 OCXO Mounting Screws ...

Page 195: ... spectrum analyzer Dress W50 orange cable next to W49 through the opening in the deck 2 Secure the OCXO to the spectrum analyzer main deck using three screws 1 and insulating washers See Figure 4 34 on page 257 3 Connect W50 to A15J306 Install tie wraps to hold W49 and W50 together 4 Fold the A14 and A15 assemblies into the spectrum analyzer as described in Procedure 8 A14 and A15 Assemblies 5 Per...

Page 196: ...259 5 Replaceable Parts ...

Page 197: ... Assembly Mounting Table 5 6 on page 280 Parts List Cover Assembly Table 5 7 on page 280 Parts List Main Chassis Table 5 9 on page 282 Parts List RF Section Table 5 10 on page 283 Parts List Front Frame Table 5 12 on page 285 Parts List Rear Frame Figure 5 1 on page 279 Parts Identification Assembly Mounting Figure 5 2 on page 287 Parts Identification Cover Assembly Figure 5 4 on page 291 Parts Id...

Page 198: ...ntity required and address the order to the nearest Agilent Technologies office See Table 1 5 on page 45 To order a part that is not listed in the replaceable parts table include the instrument model number the description and function of the part and the number of parts required Address the order to the nearest Agilent Technologies office ...

Page 199: ...ilable 6 am to 5 pm Pacific time Monday through Friday Regular orders have a four day delivery time Hotline Orders Hotline service for ordering emergency parts is available 24 hours a day 365 days a year There is an additional hotline charge to cover the cost of freight and special handling The toll free phone number is 800 227 8164 is available 6 am to 5 pm Pacific time Monday through Friday and ...

Page 200: ...on is listed for each part 1 The part number 2 The total quantity Qty in the assembly This quantity is given only once at the first appearance of the part in the list 3 The description of the part 4 A five digit code indicating a typical manufacturer of the part 5 The manufacturer part number ...

Page 201: ...upler K Relay U Integrated Circuit CR Diode Diode L Coil Inductor Microcircuit Thyristor Step M Meter V Electron Tube Recovery Diode MP Miscellaneous VR Breakdown Diode Varactor Mechanical Part Zener DC Directional Coupler P Electrical Connector Voltage Regulator DL Delay Line Movable Portion W Cable Wire Jumper DS Annunciator Lamp Plug X Socket Light Emitting Q Silicon Controlled Y Crystal Unit D...

Page 202: ...e formerly Plastic Continuous Wave USASI ASA CD Cadmium Card ASSY Assembly Cord D AWG American Wire Gage CER Ceramic CHAM Chamfer D Deep Depletion B CHAR Character Depth Diameter Characteristic Direct Current BCD Binary Coded Charcoal DA Darlington Decimal DAP GL Diallyl Phthalate BD Board Bundle CMOS Complementary Glass BE CU Beryllium Copper Metal Oxide DBL Double BNC Type of Connector Semicondu...

Page 203: ...row FT Current Gain IN Inch DWL Dowell Bandwidth Product J Transition JFET Junction Field E Frequency Feet Effect Transistor Foot E R E Ring FXD Fixed K EXT Extended Extension External Extinguish G K Kelvin Key F Kilo Potassium GEN General Generator KNRLD Knurled F Fahrenheit Farad GND Ground KVDC Kilovolts Female Film GP General Purpose Direct Current Resistor Fixed Group L Flange Frequency H FC ...

Page 204: ...ned NS Nanosecond PNL Panel MAX Maximum Non Shorting Nose PNP Positive Negative MC Molded Carbon NUM Numeric Positive Transistor MET Metal Metallized NYL Nylon Polyamide POLYC Polycarbonate MHz Megahertz O POLYE Polyester MINTR Miniature POT Potentiometer MIT Miter OA Over All POZI Pozidrive Recess MLD Mold Molded OD Outside Diameter PREC Precision MM Magnetized Material OP AMP Operational PRP Pur...

Page 205: ...Wave Resonator PB Lead Metal VDC Volts Direct Current SEG Segment TA Ambient W SGL Single Temperature SI Silicon Tantalum W Watt Wattage Square Inch TC Temperature White Wide Width SL Slide Slow Coefficient W SW With Switch SLT Slot Slotted THD Thread Threaded WW Wire Wound SMA Subminiature THK Thick X A Type Threaded TO Package Type Connector Designation X By Used with SMB Subminiature TPG Tappin...

Page 206: ...ignations Abbreviations and Multipliers MULTIPLIERS Abbreviation Prefix Multiple Abbreviation Prefix Multiple T tera 1012 m milli 10 3 G giga 109 µ micro 10 6 M mega 106 n nano 10 9 k kilo 103 p pico 10 12 da deka 10 f femto 10 15 d deci 10 1 a atto 10 18 c centi 10 2 ...

Page 207: ...07 5021 5808 2 FRAME REAR 28480 5021 5808 5021 5836 5 CORNER STRUT 28480 5021 5836 0510 1148 10 RETAINER PUSH ON KB TO SHFT EXT 11591 669 0515 0886 16 SCREW MACH M3 0 5 6MM LG PAN HD 28480 0515 0886 0515 0887 8 SCREW MACH M3 5 0 6 6MM LG PAN HD 28480 0515 0887 0515 0889 12 SCREW MACH M3 5 0 6 6MM LG 28480 0515 0889 0515 1241 8 SCREW MACH M5 0 8 12 MM LG PAN HD 28480 0515 1241 0515 1331 22 SCREW ME...

Page 208: ...8563 60184 Option 103 x x 08563 60186 Option 008 w o 103 A15U100 Sampler Assy x x 5086 7806 n a x x 08563 60180 4123A kit with 08563 60177 x x 08563 60177 4123A A17A1 Bd Assy LCD Inverter x x 0950 3644 n a A18 LCD x x 2090 0379 n a A18DS1 2 LCD Backlight Tube x x 2090 0380 n a A19 Bd Assy GPIB Interface x x 08562 60042 n a A20 Battery Holder Assy x x 5062 7755 n a A21 10MHz OCXO Assy x x 5063 0245...

Page 209: ...oard W55 5062 6471 Wire Harness Volume Control Speaker Earphone Speaker Earphone Volume Control A4J6 DC Logger Board W62 8120 8482 Wire Harness Backlight Power A17J6 Display Driver Board A17A1 Inverter Board A1W1 8121 0033 Wire Harness Probe Power Probe Power Filter Board A1A1J3 Front Panel Keyboard FL4 5061 9032 Wire Harness Line Module Assembly Rear Panel AC Input A6J10 Power Supply Assembly W18...

Page 210: ...10J4 RYTHM W30 5022 3707 Semi Rigid Cable LOMA to FL3 A7J5 LOMA FL3J1 7 0 GHz Low Pass Filter W38 5022 3708 Semi Rigid Cable YTO Out to LOMA In A11J2 YTO A7J1 LOMA W39 5022 2830 Semi Rigid Cable LOMA to Lowband Mixer A7J4 LOMA A8J3 Lowband Mixer W41 08564 20019 Semi Rigid Cable RF Input to Attenuator In Front Panel J1 RF INPUT A9J1 Input Attenuator W42 5022 3790 Semi Rigid Cable LOMA to EXT Mixer ...

Page 211: ... LG 0515 1349 11 2 Screw Machine w Washer Pan HD M3X0 5 60MM LG 0515 2310 3 3 Screw Machine w Washer Pan HD M3X0 5 110MM LG 0515 2308 2 4 Screw Machine w Patch LK Pan HD M3X0 5 6MM LG 0515 2332 10 5 Screw Machine w Washer Pan HD M3X0 5 12MM LG 0515 0664 1 6 Screw Machine w Washer Pan HD M3X0 5 8MM LG 0515 1950 1 ...

Page 212: ...8728 2 9 Screw Machine w Patch LK Flat HD M4X0 7 8MM LG 0515 2043 6 10 Screw Machine w Patch LK Flat HD M5X0 8 16MM LG 0515 2049 2 11 Cover Instrument 5001 8800 1 12 Moisture Deflector Left 5041 7238 1 13 Moisture Deflector Right 5041 3989 1 14 Side Trim 5041 8913 2 15 Screw Machine w Patch LK Pan HD M4X0 7 10MM LG 0515 1819 2 16 Rear Foot 5041 8907 2 17 O Ring 0900 0024 4 18 Lock Washer 2190 0587...

Page 213: ...7 Screw Machine Flat HD M3X0 5 6MM LG 0515 1227 2 18 Side Frame 5021 7464 2 19 Screw Machine Flat HD M4X0 7 8MM LG 0515 1101 12 20 Screw Machine Flat HD M3X0 5 5MM LG 0515 1521 12 21 Screw Machine Flat HD M3X0 5 6MM LG 0515 1227 8 22 Screw Machine Flat HD M3X0 5 6MM LG 0515 1227 5 23 Board Mount 5021 5484 5 24 Hinge Assembly 2 Board 5062 0750 2 25 Hinge Assembly 4 Board 5062 0751 2 26 Cable Clamp ...

Page 214: ...5 12 13 Bumper Kit Includes 4 Bumpers 5062 4806 1 15 Catch Latch 5021 5483 2 Screw Machine Pan HD M2 5X0 45 6MM LG 0515 0366 4 Lock Washer Helical 2 6MM ID 5 1MM OD 0 6MM THK 2190 0583 4 17 Front Frame 5022 3662 1 18 RFI Shielding Round Strip 8160 0520 1 19 Nut 9 16 28 THD 0590 2563 1 20 Lock Washer Internal 3 8 IN 377 IN ID 2190 0016 1 21 Nut 3 8 32 THD 188 IN THK 2950 0144 1 22 Connector RF Inpu...

Page 215: ... Filter x x 1000 1014 1 5 LCD Mount x x 5041 9632 1 6 LCD Backplate x x 5000 8314 1 7 LCD Driver Shield x x 5022 3667 1 8 Bracket Board Mounting x x 5022 3665 1 9 Bracket Attenuator Mounting x x 5022 3664 1 10 Screw Machine Flat HD M3X0 5 6MM LG x x 0515 1227 4 11 Screw Machine Pan HD M2 5X0 45 6MM LG x x 0515 0366 4 12 Screw Machine Flat HD M4X0 7 8MM LG x x 0515 1101 2 13 Foam Pad Adheres to A17...

Page 216: ...M3X0 5 6MM LG x x 0515 1946 2 11 Screw Machine Pan HD M4X0 7 6MM LG x x 0515 0684 1 12 Nut 15 32 32 THD x x 2950 0035 5 13 Earphone Jack Includes Cable Speaker Volume Control x x 5062 6471 1 14 Rear Dress Panel x x 5002 4049 1 16 RFI Shielding Round Strip x x 8160 0520 1 17 Rear Frame x x 5022 3778 1 18 Screw GPIB Connector x x 5021 6391 2 19 Screw Machine Flat HD 4 40 0 25 IN LG x x 2200 0225 2 2...

Page 217: ...1227 2 9 Front End Deck 5002 4047 1 11 Screw Machine Flat HD M3X0 5 5MM LG 0515 1032 4 12 Screw Machine Flat HD 6 32 0 375 IN LG 2360 0461 4 14 Screw Machine w Washer Pan HD M3X0 5 8MM LG 0515 1950 2 18 Attenuator Bracket 5002 1007 1 20 Screw Machine Flat HD M3X0 5 6MM LG 0515 1227 3 22 Screw Machine Flat HD M3X0 5 5MM LG 0515 1521 4 23 Screw Machine w Washer Pan HD M3X0 5 25MM LG 0515 0667 2 24 P...

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Page 224: ...303 6 Major Assembly and Cable Locations ...

Page 225: ...Use the list below to determine the figure s illustrating the desired assembly or cable Assemblies Figure A1 Front Frame 6 6 A1A1 Keyboard 6 6 A2 Controller 6 1 A3 Interface 6 1 A4 Log Ampli er Cal Oscillator 6 1 A5 IF Filter 6 1 6 3 A6 Power Supply 6 3 A7 LO Multiplier Amplifer LOMA 6 8 A8 Low Band Mixer 6 8 A9 RF Attenuator 6 8 A10 A12 RYTHM SBTX 6 8 A11 YTO 6 8 A13 Second Converter 6 8 A14 Freq...

Page 226: ...e cable 6 6 6 8 W17 NOT ASSIGNED W18 LO sweep coax 97 6 6 W19 Second IF out coax 83 6 5 W20 Zero Span Video A2J5 to A3J103 NOT SHOWN W21 NOT ASSIGNED W22 10 MHz frequency count coax 0 6 5 W23 External trigger in coax 93 NOT SHOWN W24 Video out coax 5 NOT SHOWN W25 Blanking out coax 4 NOT SHOWN W26 NOT ASSIGNED W27 Filtered 10 7 MHz coax 3 6 3 W28 RYTHM LO cable 6 8 W29 10 7 IF coax 7 6 3 6 5 W30 L...

Page 227: ...6 8 W49 OCXO 10 MHz out coax 82 6 5 W50 OCXO power part of A21 OCXO assembly 6 5 W51 10 MHz Reference 2 coax 84 6 5 W52 CAL oscillator out coax 9 6 3 6 6 W53 Frequency counter coax 1 NOT SHOWN W54 Video coax 2 NOT SHOWN W55 Audio out 6 3 W56 Semirigid coax A12J1 to FL2 6 8 W57 Semirigid coax FL2 to A13J1 6 8 W58 ALT SWEEP OUT Coax 8 6 6 W59 NOT ASSIGNED W60 ribbon A2J8 to A17J1 6 2 6 3 W61 coax J9...

Page 228: ...Chapter 6 307 Major Assembly and Cable Locations Introduction Figure 6 2 Top View A2 and A3 Unfolded ...

Page 229: ...308 Chapter6 Major Assembly and Cable Locations Introduction Figure 6 3 Top View A2 A3 A4 and A5 Unfolded ...

Page 230: ...310 Chapter6 Major Assembly and Cable Locations Introduction Figure 6 5 Bottom View A15 Unfolded ...

Page 231: ...Chapter 6 311 Major Assembly and Cable Locations Introduction Figure 6 6 Bottom View A15 and A14 Unfolded ...

Page 232: ...ly and Cable Locations Introduction Figure 6 8 Front End A8 W39 W15 W45 W44 W15 W47 W33 W45 W39 W46 FL1 A13 W3 A8 W39 W28 W10 W56 W35 A11 W46 W13 W38 FL2 W57 W43 W48 W42 A7 W30 W38 W12 W41 W47 W16 FL5 A10 A12 W11 W44 A9 FL3 W34 ...

Page 233: ...314 Chapter6 Major Assembly and Cable Locations Introduction Figure 6 9 Rear View FL4 B1 BT1 A20 VGA Connector ...

Page 234: ...315 7 General Troubleshooting ...

Page 235: ...s 2 and 3 WARNING Troubleshooting and repair of this instrument with the cover removed exposes high voltage points that if contacted may cause personal injury Maintenance and repair of this instrument should be performed only by a skilled person who knows the hazards involved Where maintenance can be performed without power applied power should be removed When any repair is completed be sure that ...

Page 236: ...ly probed provided caution is used to prevent accidental shorting between adjacent pins Figure 7 1 on page 318 illustrates the pin configuration for the test jack Line names are the same for all test jacks The following mnemonics are used MS measured signal and OS output signal Test jack test points are identified on block diagrams by both the jack pin number and line name Ribbon Cables Ribbon cab...

Page 237: ...on Figure 7 1 Assembly Test Points Figure 7 4 on page 321 shows the pin configuration for the 80 pin W60 cable that is found on EC series instruments The numbering of the pins is identical on the A2 Controller board and the A17 Display Driver board ...

Page 238: ...Chapter 7 319 General Troubleshooting Introduction Figure 7 2 Ribbon Cable Connections 1 of 3 ...

Page 239: ...320 Chapter7 General Troubleshooting Introduction Figure 7 3 Ribbon Cable Connections 2 of 3 ...

Page 240: ...ure 7 4 Ribbon Cable Connections 3 of 3 Figure 7 4 shows A2J8 connections on 8560 EC Series Instruments Lines 2 5 and 42 44 supply 5V to the two LCD backlights Lines 1 and 41 supply 5V to the A17A1 Inverter board Lines 1 6 and 41 44 are identical on A17J1 ...

Page 241: ...from the factory in the WR PROT write protect position jumper on pins 2 and 3 When the jumper is set to the WR ENA write enable position jumper on pins 1 and 2 an additional service cal data menu is displayed under CAL Figure 7 5 on page 323 illustrates those areas of the service cal data menu that are available ...

Page 242: ...Chapter 7 323 General Troubleshooting Introduction Figure 7 5 Service Cal Data Menu ...

Page 243: ...lay use the following BASIC program to read these errors over GPIB If the program returns an error code of 0 there are no errors 10 DIM Err 128 20 OUTPUT 718 ERR 30 ENTER 718 Err 40 PRINT Err 50 END a If there is no response over GPIB set an oscilloscope to the following settings Sweep time 2 ms div Amplitude scale 1 V div b The signals at A2J202 pin 3 and pin 14 should measure about 4 Vp p If the...

Page 244: ...play Power Supply Section A6A2 regulator Chapter 13 Display Power Supply Section A7 LOMA Chapter 12 RF Section A8 low band mixer Chapter 12 RF Section A9 input attenuator Chapter 12 RF Section A10 RYTHM Chapter 12 RF Section A11 YTO Chapter 11 Synthesizer Section A12 SBTX Chapter 12 RF Section A13 2nd converter Chapter 12 RF Section A14 frequency control Chapter 11 Synthesizer Section Chapter 12 R...

Page 245: ...300 to 301 7 15 YTO Loop Errors 317 to 320 7 15 YTO Loop Error 331 7 15 600 MHz Reference Loop 333 7 16 Sampling Oscillator 335 7 16 10 MHz Reference 336 7 16 Fractional N PLL 337 7 16 LOMA Local Oscillator Multiplier Amplifier Leveling Loop Errors 338 to 340 7 17 YTO Loop Settling Errors 351 to 354 7 17 Sampling Oscillator 355 7 17 Span Accuracy Calibration Errors 356 to 361 7 18 Automatic IF Err...

Page 246: ... LO IF Wait for the sequence to finish 4 Press RECALL and RECALL STATE 5 Recall the previously stored STATE 6 If an error message is still displayed refer to the following list of error messages for an explanation of the error System Analyzer Programming Errors 100 to 150 Refer to the 8560 E Series Spectrum Analyzers User s Guide for information on programming the spectrum analyzer 100 NO PWRON Po...

Page 247: ...his command 123 NOP ABLK A block format not valid here 124 NOP IBLK I block format not valid here 125 NOP STRNG Strings are not valid for this command 126 NO This command cannot be queried 127 BAD DTMD Not a valid peak detector mode 128 PK WHAT Not a valid peak search parameter 129 PRE TERM Premature A block termination 130 BAD TDF Arguments are only for TDF command 131 AM FM AM FM are not valid a...

Page 248: ...DC hardware firmware interaction check for other errors 202 FADC CAL Binary search failed during FADC linear offset calibration This error applies only to EC series analyzers and E series analyzers with fast ADC Option 007 203 FADC CAL Binary search failed during FADC log offset calibration This error applies only to EC series analyzers and E series analyzers with fast ADC Option 007 204 FADC CAL ...

Page 249: ...20 These messages indicate that the YTO main coil coarse DAC ERR 317 or fine DAC ERR 318 is at its limit If error codes 300 or 301 are not present a hardware problem exists in the YTO loop but the loop can still acquire lock Refer to Chapter 11 to troubleshoot the YTO PLL The ADC circuit on the A3 interface assembly may also cause this error 317 FREQ ACC Main coil coarse DAC at limit The main coil...

Page 250: ... assembly ERR 333 is set if LO3ERR is outside of its prescribed limits Sampling Oscillator 335 This error indicates an unlocked sampling oscillator also known as the offset lock loop 335 SMP UNLK Sampling oscillator PLL is unlocked ERR 335 is set if OFL_ERR is outside its prescribed limits 10 MHz Reference 336 This message occurs during the internal IF calibration routines The routine locks the ca...

Page 251: ...ltage is monitored by the ADC ERR 334 is set if LOMA AGC is outside of its prescribed limits Refer to A7 LOMA Drive in Chapter 12 339 SBTX AGC The LOMA SBTX switched barium tuned mixer loop AGC is unleveled If ERR 338 LOMA AGC is also present refer to ERR 338 Otherwise refer to A7 LOMA Drive in Chapter 12 340 SAMP AGC The LOMA local oscillator multiplier amplifier sampler loop AGC is unleveled If ...

Page 252: ...ding bucket 1 of the span accuracy calibration sweep This error indicates a possible failure of the sweep generator span attenuator or main FM coil sweep switches on the A14 frequency control assembly Refer to Chapter 11 Synthesizer Section 357 SPAC CAL Cannot find the x intersection for bucket 1 of the span accuracy calibration sweep This error indicates a possible failure of the sweep generator ...

Page 253: ...z 1 Hz and 2 MHz The routine restarts from the beginning if a fault is detected Parameters adjusted after the routine begins but before the fault is detected are correct parameters adjusted later in the sequence are suspect Refer to Automatic IF Adjustment in Chapter 8 The IF Section relies on the ADC and video circuitry to perform its continuous IF adjustments IF related errors occur if the ADC v...

Page 254: ... spectrum analyzer and set its controls as follows Center frequency 10 7 MHz Reference level 30 dBm 3 Observe the spectrum analyzer display while pressing FULL IF ADJ on the spectrum analyzer If a 35 dBm signal does not appear troubleshoot the cal oscillator on the A4 assembly 4 If a 35 dBm signal does appear troubleshoot the A5 IF assembly 405 RBW 10K Unable to adjust 10 kHz resolution bandwidth ...

Page 255: ...crystal pole 420 RBW 3K Unable to adjust 3 kHz resolution bandwidth in fourth crystal pole 421 RBW 10K Unable to adjust 10 kHz resolution bandwidth in first crystal pole 422 RBW 10K Unable to adjust 10 kHz resolution bandwidth in second crystal pole 423 RBW 10K Unable to adjust 10 kHz resolution bandwidth in third crystal pole 424 RBW 10K Unable to adjust 10 kHz resolution bandwidth in fourth crys...

Page 256: ...ution bandwidth amplitude low in second crystal pole 440 RBW 1K 1 kHz resolution bandwidth amplitude low in third crystal pole 441 RBW 1K 1 kHz resolution bandwidth amplitude low in fourth crystal pole 442 RBW 3K 3 kHz resolution bandwidth amplitude low in first crystal pole 443 RBW 3K 3 kHz resolution bandwidth amplitude low in second crystal pole 444 RBW 3K 3 kHz resolution bandwidth amplitude l...

Page 257: ...ond step gain stage 463 AMPL Unable to adjust third step gain stage 464 AMPL Unable to adjust third step gain stage 465 AMPL Unable to adjust third step gain stage 466 LIN AMPL Unable to adjust linear amplifier scale 467 LOG AMPL Unable to adjust step gain amplifiers 468 LOG AMPL Unable to adjust third step gain stage 469 LOG AMPL Unable to adjust step gain amplifiers 470 LOG AMPL Unable to adjust...

Page 258: ...t the resolution bandwidths less than 300 Hz Crystal sweep gain problem 492 RBW 300 Unable to adjust 300 Hz resolution bandwidth Crystal sweep gain problem 493 RBW 1K Unable to adjust 1 kHz resolution bandwidth Crystal sweep gain problem 494 RBW 3K Unable to adjust 3 kHz resolution bandwidth Crystal sweep gain problem 495 RBW 10K Unable to adjust 10 kHz resolution bandwidth Crystal sweep gain prob...

Page 259: ...cal oscillator from adjusting the 1 MHz or 30 kHz through 300 kHz bandwidths This symptom implies a failure in the oscillator function block X See the A4 log amp cal oscillator schematic sheet 4 of 4 The oscillator is unable to tune the required frequency range with the 9 V to 9 V control voltage Troubleshoot A4CR802 most probable cause L801 C808 C809 and U807 500 AMPL 30K Unable to adjust amplitu...

Page 260: ...nable to adjust 1 kHz resolution bandwidth Insufficient gain during crystal bandwidth calibration 515 RBW 3K Unable to adjust 3 kHz resolution bandwidth Insufficient gain during crystal bandwidth calibration 516 RBW 10K Unable to adjust 10 kHz resolution bandwidth Insufficient gain during crystal bandwidth calibration 517 RBW 100 Unable to adjust 100 Hz resolution bandwidth Crystal sweep problem 5...

Page 261: ...able 532 RBW 300 Absolute gain data for resolution bandwidths 300 Hz not acceptable 533 RBW 300 ADC timeout adjusting resolution bandwidths less than 300 Hz Timeout during data sampling narrow bandwidth chunk 534 RBW 300 Unable to do frequency count of CAL OSC using IF down converter when adjusting resolution bandwidths less than 300 Hz 535 RBW 300 Unable to obtain adequate FM demod range to measu...

Page 262: ...to adjust amplitude of log scale 561 LOG AMPL Unable to adjust amplitude of log scale Possible problem in second step gain 562 LOG AMPL Unable to adjust amplitude of log scale Possible problem in second step gain 563 LOG AMPL Unable to adjust amplitude of log scale Possible problem in third step gain range 564 LOG AMPL Unable to adjust amplitude of log scale 565 LOG AMPL Unable to adjust amplitude...

Page 263: ...Unable to adjust 100 kHz resolution bandwidth and resolution bandwidths less than or equal to 10 kHz ADC CALOSC handshake calibration problem in crystal sweep Refer to Error 582 582 AMPL Unable to adjust 100 kHz resolution bandwidth and resolution bandwidths less than or equal to 10 kHz Bad CALOSC calibration in sweep rate Test the 100 kHz resolution bandwidth filter 3 dB bandwidth as follows 1 Co...

Page 264: ...Specification troubleshooting text in Chapter 9 IF Section 1 Remove the shields 2 Connect an oscilloscope probe to A4U804C pin 8 3 On the spectrum analyzer press CAL and FULL IF ADJ 4 Approximately 8 seconds after starting the FULL IF ADJ check for negative going parabolas similar to half sine waves 5 ms wide and approximately 4 V at their peak Refer to Chapter 9 IF Section for more information on...

Page 265: ...firmware interaction check other errors 650 OUTOF RG ADC input is outside of the ADC range 651 NO IRQ Microprocessor is not receiving interrupt from ADC Digital and Checksum Errors 700 to 799 EEROM Checksum Errors 700 to 704 Faults on the A2 controller assembly can cause these errors Refer to Chapter 10 Controller Section Although some of these errors might result in a blanked display it is possib...

Page 266: ...of customer preselector peak data External preselector data recalled in internal mode or internal preselector data recalled in external mode To clear the error press RECALL MORE 1 OF 2 FACTORY PRSEL PK SAVE and SAVE PRSEL PK Program ROM Checksum Errors 705 to 710 The instrument power on diagnostics perform a checksum on each programmed ROM A2 controller assembly If an invalid checksum is found for...

Page 267: ...16 RAM U304 Checksum error of system RAM A2U304 Microprocessor Error 717 717 BAD uP Microprocessor not fully operational Refer to Chapter 10 Controller Section Battery Problem 718 If STATE or TRACE data is found to be corrupt the processor tests the display RAMs and the program RAMs containing the STATE information If the RAMs are working properly this error message is generated To check the BT1 b...

Page 268: ...ction integer overflow Check for other errors 755 SYSTEM Hardware firmware interaction square root error Check for other errors 756 SYSTEM Hardware firmware interaction triple overflow Check for other errors 757 SYSTEM Hardware firmware interaction BCD overflow Check for other errors 758 SYSTEM Unknown system error 759 SYSTEM Hardware firmware interaction Code invoked for wrong instrument Fast ADC...

Page 269: ...rations which were not yet done due to an OVENCOLD condition An OVENCOLD error is indicative of a bandwidth 1 kHz not getting calibrated 908 BW SPCG Channel bandwidth is too wide compared to the channel spacing for a meaningful adjacent channel power computation 909 SPANACP The frequency span is too small to obtain a valid adjacent channel power ACP measurement 910 SPAN ACP The frequency span is t...

Page 270: ...The spectrum analyzer is comprised of the six main sections listed below See Figure 7 6 on page 352 The following descriptions apply to the simplified block diagram and overall block diagram located at the end of this chapter Assembly level block diagrams are located in Chapters 8 through 13 ...

Page 271: ...352 Chapter7 General Troubleshooting Block Diagram Description Figure 7 6 Functional Sections ...

Page 272: ...ed only in the digital resolution bandwidths 100 Hz In band 0 A8 low band mixer up converts the RF input to a 1st IF of 3 9107 GHz In bands 4 and 5 A12 SBTX down converts the RF input to a 1st IF of 3 9107 GHz A13 second converter down converts the 3 9107 GHz IF to an IF of 310 7 MHz A third conversion on the A15 RF assembly down converts the second IF to the 10 7 MHz third IF A fourth conversion ...

Page 273: ...ifiers is provided via W15 from A14 A9 Input Attenuator The attenuator is a 50Ω precision coaxial step attenuator Attenuation in 10 dB steps from 0 dB to 70 dB is accomplished by switching the signal path through one or more of the three resistive pads The attenuator automatically sets to 70 dB when the spectrum analyzer turns off providing ESD protection Note that the input attenuator is not fiel...

Page 274: ...e desired frequency A12 Switched Barium Tuned Mixer SBTX The switched barium tuned mixer SBTX is a combination of an RF switch tracking preselector millimeter 26 5 GHz to 50 GHz mixer and low noise amplifier The PIN diode switch directs the RF input to the appropriate mixer in the A12 SBTX or to A10 RYTHM where it may be again switched to the A8 low band mixer The tracking preselector is a barium ...

Page 275: ... mixers Third Converter part of A15 The third converter down converts the 310 7 MHz IF to 10 7 MHz A PIN diode switch selects the LO signal used For normal operation a 300 MHz LO signal is used The signal is derived from the 600 MHz reference PLL During signal identification SIG ID ON the 298 MHz SIG ID oscillator is fed to the double balanced mixer on alternate sweeps Flatness Compensation Amplif...

Page 276: ...e main coil or the FM coil of the A11 YTO For LO spans 2 0 MHz the YTO PLL remains locked and the fractional N PLL sweeps while remaining phase locked The frequency span relationships are as follows When the sweep ramp is applied to the YTO the spectrum analyzer must prevent this loop from trying to compensate for changes in the output frequency To accomplish this the spectrum analyzer opens the P...

Page 277: ...uency is phase locked to the output of the fractional N PLL The A15U100 sampler mixes the LO signal from the A7 LOMA with a harmonic of the sampling oscillator The mixing product the sampler IF is between 60 and 96 MHz same frequency range as the fractional N PLL Offset Lock Loop part of A15 The 285 MHz to 297 2 MHz sampling oscillator is used to sample the YTO By changing the offset lock loop pro...

Page 278: ...vides the remaining 60 dB of log mode IF gain The linear amplifiers on the A4 assembly provide 40 dB of linear mode gain IF gain steps of less than 10 dB regardless of the reference level are accomplished on the A5 assembly A4 Log Amplifier Cal Oscillator Assembly The A4 log amplifier has separate log and linear amplifier paths After amplification the signal path consists of a linear detector vide...

Page 279: ...Hz All filter stages are in series PIN diode switches bypass unwanted stages An automatic IF adjustment in spectrum analyzer firmware sets center frequency and 3 dB bandwidth of all filter poles through varactor and PIN diodes The firmware also controls crystal pole symmetry and the step gain amplification ADC Interface Section The ADC interface section is the link between the controller section a...

Page 280: ... Pretriggering is possible with fast ADC Log Expand Video Functions The A3 interface assembly performs log expand and offset functions The log expand log offset amplifier provides a 2 dB Div log scale When the main ADC is used the 5 dB Div scale is derived by multiplying the digitized 10 dB Div trace data by two in the CPU When the fast ADC is used the 5 dB Div scale is derived by amplifying the v...

Page 281: ...C circuitry GPIB interface control frequency counter display RAM option module interface and EEROM The A19 GPIB is a mechanical interface between the standard GPIB connector and the ribbon cable connector on the A2 controller assembly All four RAM ICs are battery backed The battery backed RAM stores trace information two display memory RAMs and spectrum analyzer state information two program RAMs ...

Page 282: ...ure environments and faster louder only when necessary A17 LCD Display Driver The display is an LCD color flat panel screen with 640 X 480 VGA resolution A connector for an external VGA is available at the rear panel The A17A1 backlight supply provides the high voltage to supply the two backlights in the LCD display The LCD display is not adjustable The display driver board consists of the Hitatch...

Page 283: ...364 Chapter7 General Troubleshooting Block Diagram Description ...

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Page 287: ...377 8 ADC Interface Section ...

Page 288: ...king Control Real Time DAC page 388 Flatness Control RF Gain DACs page 389 A3 Assembly Video Circuits page 391 Log Offset Log Expand page 393 Video MUX page 394 Video Filter page 395 Video Filter Buffer Amplifier page 396 Positive Negative Peak Detectors page 397 Peak Detector Reset page 398 Rosenfell Detector page 399 ADC MUX page 400 Variable Gain Amplifier VGA page 402 Track and Hold page 402 A...

Page 289: ...1 3 3 48 3 3 D2 4 4 47 4 4 D3 5 5 46 5 5 D4 6 6 45 6 6 D GND 7 7 44 7 7 D5 8 8 43 8 8 D6 9 9 42 9 9 D7 10 10 41 10 10 A0 11 11 40 11 11 D GND 12 12 39 12 12 A1 13 38 13 13 A2 14 37 14 14 A3 15 15 36 15 15 A4 16 35 16 16 D GND 17 17 34 17 17 A5 18 33 18 A6 19 32 A7 20 31 20 D GND 21 21 30 21 21 LRF_STB 22 22 LFC_STB 23 23 LIF_STB 24 27 CAL OSC TUNE 25 25 LLOG_STB 26 26 VCMON 27 D GND 28 28 23 28 28...

Page 290: ...ignal A3J2 pins A4J2 pins A5J2 pins A14J2 pins A15J2 pins A GND 35 35 16 35 35 RF GAIN 36 36 LO3 ERR 37 37 A GND 38 38 13 38 38 LVFC_ENABLE 39 39 FC ERR 40 40 A GND 41 41 10 41 41 YTO ERR 42 42 10V REF 43 43 43 A GND 44 44 7 44 44 SCAN RAMP 45 45 VIDEO TRIGGER 46 A GND 47 47 4 47 47 NC R T DAC2 49 R T DAC1 50 50 Indicates signal source ...

Page 291: ...Chapter 8 381 ADC Interface Section Introduction Figure 8 2 A3 Test Connector Pin Locations ...

Page 292: ...The keys are arranged in a row column matrix as shown in Table 8 3 on page 382 2 If an entire row or column of keys does not respond and the RPG does respond there might be an open or shorted wire in A1A1W1 3 Check that all inputs to NAND gate A3U607 LKSNS lines are high when no key is pressed If any input is low continue with the following a Disconnect A1A1W1 from A3J602 and again check all input...

Page 293: ...Component Level Information U608B latches the RPG direction from the two RPG outputs RPG_COUNT and RPG_COUNT1 Counterclockwise RPG rotation produces low going pulses which result in a high output on U608B Clockwise RPG rotation results in a low output from U608B U612A provides the edge to trigger one shot U423B which generates a 90 ms pulse This pulse gates U610A for counting of RPG pulses by U606...

Page 294: ...approximately every 90 ms 11 If HRPG_IRQ is correct but LRPG_RESET is incorrect check U505 pin 13 LKBD RPG_IRQ for narrow low going pulses approximately every 90 ms 12 If HRPG_IRQ and LKBD RPG_IRQ are correct but LRPG_RESET is incorrect suspect a failure on the A2 controller assembly 13 Check U610 pin 3 for a 7 8 kHz square wave Check U606 pin 2 HRPG_RESET for narrow high going pulses approximatel...

Page 295: ...generates the gate delay and output 1 from pin 13 of A3U617 generates the gate length The duration of these two time intervals is set using front panel softkeys under the SWEEP key The trigger input for Gated Video is the rear panel EXT GATE TRIG INPUT TTL 10 kΩ 1 Check that the trigger MUX is receiving the proper trigger source information by selecting each of the following trigger modes and chec...

Page 296: ...e instrument does not appear to be sweeping proceed as follows a Press PRESET SWEEP and DLY SWP ON OFF until ON is underlined then DLY SWP 30 milliseconds b Using an oscilloscope check for activity at pins 1 and 3 of A3U615A c If there is activity at pin 1 but not at pin 3 of A3U615A suspect A3U616 or A3U617 d If there is activity at pin 1 and pin 3 of A3U615A suspect A3U615 Check pin 5 for activi...

Page 297: ...s div CHAN CHANNEL 1 2 3 4 off on highlight CHANNEL 1 on set V div to 0 2 V and offset to 0 6 V 10 1 probe used highlight CHANNEL 4 on set V div to 2 V and offset to 0 V DISPLAY DISPLAY norm avg env highlight norm g Using a 10 1 probe connected to channel 1 of the oscilloscope check for activity at pins 10 and 13 of A3U617 h If either pin or both show no activity check for activity at pin 21 LTIME...

Page 298: ... MKR AUX CTRL INTERNAL MIXER and PRESEL MAN ADJ 4 Monitor the DVM reading while changing the PRESELECTOR TUNE value from 0 to 255 The PRESELECTOR TUNE value is the setting of R T DAC1 5 Check that the DVM reading increases from 0 to approximately 10 Vdc as R T DAC1 is set from 0 to 255 6 If the voltage does not change as described set the spectrum analyzer to single trigger mode and check the foll...

Page 299: ...ess CAL MORE 1 OF 2 SERVICE CAL DATA FLATNESS and FLATNESS DATA Press NEXT BAND until FLATNESS BAND 0 is displayed 3 Press the key until DATA 300 MHz is displayed Note the number directly below DATA 300 MHz this is the RF Gain DAC value 4 Connect a positive DVM lead to A3J400 pin 13 and the negative DVM lead to A3TP4 5 Check that the DVM reading increases from near 0 Vdc to between 1 3 and 1 9 Vdc...

Page 300: ...390 Chapter8 ADC Interface Section Flatness Control RF Gain DACs 8 Place the WR PROT WR ENA jumper on the A2 controller assembly in the WR PROT position Press PRESET ...

Page 301: ...Hz Log division 10 dB DIV 4 If a trace is displayed troubleshoot the A3 assembly If a trace is absent connect an oscilloscope to the rear panel BLKG GATE OUTPUT 5 The presence of a TTL signal TTL low during 20 ms sweep indicates a good A3 Interface Assembly Troubleshoot the IF section 6 If the BLKG GATE OUTPUT is always at a TTL high or low troubleshoot the trigger video gating circuits on A3 7 Re...

Page 302: ...es not change 100 mV per 10 dB step refer to Video Filter on page 395 17 If the voltage at A3TP15 is correct move the oscilloscope probe to A3TP17 and step the reference level between 10 dBm and 30 dBm If the voltage does not change 100 mV per 10 dB step refer to Video Filter Buffer Amplifier on page 396 18 If the voltage at A3TP17 is correct move the oscilloscope probe to A3TP6 Set the following ...

Page 303: ...deo signal by 0 8 V and providing a gain of 5 to the top 0 2 V of the video signal The 0 8 V offset is accomplished by sinking 2 mA through R114 by current source U105 Q101 1 On the spectrum analyzer press PRESET SPAN ZERO SPAN CAL and IF ADJ OFF 2 Disconnect W26 coax 2 from A3J101 and connect the output of a function generator to A3J101 3 Set the function generator to the following settings Outpu...

Page 304: ...0 and a TTL low on A3U104 pin 2 4 If the logic levels on A3U104 are incorrect check the LLOG_STB signal as follows a Monitor A3U104 pin 9 with an oscilloscope or logic probe Check that a 1 microsecond low going pulse is present when switching between 10 dB div and 2 dB div b Check the inputs to A3U104 pins 3 and 11 while switching between 10 dB div and 2 dB div c If the logic signals are incorrect...

Page 305: ...ck and hold circuitry When Gated Video is selected the video signal is gated turned on periodically for a set duration of time This function is shown in block V of the block diagram as a series switch that allows the video signal to pass only when it is closed The actual switch U109B CR118 shunts the video to ground video signal is passed only when the switch is open The control circuitry for this...

Page 306: ...ain to source no voltage drops should occur 9 To return the spectrum analyzer to automatic sweep press SWEEP SWEEP CONT SGL or PRESET Video Filter Buffer Amplifier Refer to function block W of A3 Interface Assembly Schematic Diagram sheet 5 of 6 in the 8560 E Series Spectrum Analyzer Component Level Information The video filter buffer amplifier provides outputs for video trigger positive and negat...

Page 307: ...ifier A3Q206 Q211 and Q212 buffers the hold capacitor Both the input and output amplifiers have a gain of one Each amplifier has local feedback On the output amplifier the emitter of Q212 connects to the gate of Q206 On the input amplifier the feedback goes through Q209 and Q208 back to the base of U204D Global feedback occurs from the output amplifier through R223 back to the input amplifier U204...

Page 308: ... J101 and varying its output from 0 V to 1 V 7 If the peak detector appears latched up check LPOS_RST U422 pin 4 for a negative TTL level reset pulses The reset pulses should occur every 130 µs and should be approximately 250 ns wide 8 If the reset pulses are absent troubleshoot the Peak Detector Reset circuitry 9 If the reset pulses are present check the gate of Q207 The pulses should be positive...

Page 309: ... 8560 E Series Spectrum Analyzer Component Level Information If both HPOS_HLDNG and HNEG_HLDNG are high during the same bucket HROSENFELL will also be set high This indicates that the video signal probably consists of noise since it rose and fell during the same period The HROSENFELL signal is valid only when the NORMAL rosenfell detector mode is selected 1 Remove anything connected to the 8564EC ...

Page 310: ... pin 4 is mostly high with a 1 MHz video bandwidth and mostly low with a 1 kHz video bandwidth 9 Check that LNEG_HLDNG U408A pin 13 is mostly high with a 1 MHz video bandwidth and mostly low with a 1 kHz video bandwidth ADC MUX Refer to function block AA of A3 Interface Assembly Schematic Diagram sheet 6 of 6 in the 8560 E Series Spectrum Analyzer Component Level Information The ADC MUX switches v...

Page 311: ... procedure in Chapter 11 5 Set the spectrum analyzer to the following settings Span 5 MHz Sweep time 50 ms 6 Check for the presence of the SCAN RAMP signal by connecting an oscilloscope probe to A3J2 pin 45 component side of A3J2 Connect the negative probe lead to A3TP4 7 A 0 to 10 V ramp should be present in both LINE and FREE RUN trigger modes If the waveform is present only in LINE trigger ADC ...

Page 312: ...mation The VGA provides adjustable gain in the video path Its nominal gain of 7 can be adjusted 10 U112 removes dc offset to keep U113 in its monotonic range Both U112 and U113 are set to the same value The DAC settings cannot be changed from the front panel Track and Hold Refer to function block AC of A3 Interface Assembly Schematic Diagram sheet 6 of 6 in the 8560 E Series Spectrum Analyzer Comp...

Page 313: ... Schematic Diagram sheet 2 of 6 in the 8560 E Series Spectrum Analyzer Component Level Information The ADC requires two signals from the A2 controller assembly HBADC_CLK0 and HBBKT_PULSE HBBKT_PULSE is used only in zero span Use the following steps to verify the signals 1 Disconnect W22 from A2J8 2 If a 10 MHz TTL signal is absent on W22 refer to the 10 MHz Reference on the A15 RF assembly trouble...

Page 314: ...w at A3U509 pin 14 3 Set the detector mode to NORMAL 4 Check that A3U509 pins 2 and 14 are both TTL low 5 Set the spectrum analyzer to the following settings Span 1 MHz Detector mode SAMPLE 6 Check for a TTL high at A3U509 pin 2 and a TTL low at A3U509 pin 14 7 Press CAL and REALIGN LO IF During the realignment A3U509 pin 2 should be TTL low and pin 14 should be TTL high until the 10 kHz and narro...

Page 315: ...t LCMPLT indicates that the successive approximation state machine SASM has completed the ADC conversion 6 Check that LDONE U506 pin 19 goes TTL low approximately 2 µs after LCMPLT goes low ADC Refer to function block A of A3 Interface Assembly Schematic Diagram sheet 2 of 6 in the 8560 E Series Spectrum Analyzer Component Level Information The successive approximation state machine SASM consists ...

Page 316: ...ltage levels at these points are difficult to interpret Ramp Counter Refer to function block D of A3 Interface Assembly Schematic Diagram sheet 2 of 6 in the 8560 E Series Spectrum Analyzer Component Level Information The ramp counter is used for sweeps with widths greater than 2 0 MHz times N The analog sweep ramp is compared to the digital ramp counter When the analog sweep ramp exceeds the DAC ...

Page 317: ...e 2 Monitor A3U401 pin 3 LRF_STB with an oscilloscope or logic probe This is the strobe for the A15 RF Assembly 3 Press AUX CTRL and REAR PANEL and check that pulses occur when toggling between 10 MHz INT and 10 MHz EXT 4 Monitor U401 pin 5 LFC_STB with an oscilloscope or logic probe This is the strobe for the A14 frequency control assembly 5 Press AMPLITUDE and check that pulses occur when toggli...

Page 318: ...ilure in either U405 data lines or U406 address lines 17 Remove jumpers Analog Bus Timing Refer to function block P of A3 Interface Assembly Schematic Diagram sheet 4 of 6 in the Spectrum Analyzer Component Level Information and 8560 E Series Spectrum Analyzer Component Level Information Analog bus timing ABT generates the strobes for the A4 A5 A14 and A15 assemblies The A14 frequency control asse...

Page 319: ...7 LIF_STB with an oscilloscope or logic probe This is the strobe for the A5 IF assembly 12 Press AMPLITUDE and check that pulses occur when toggling between REF LVL settings of 10 dBm and 20 dBm 13 Monitor A3U401B pin 9 LLOG_STB with an oscilloscope or logic probe This is the strobe for the A4 log amplifier cal oscillator assembly 14 Press AMPLITUDE and check that pulses occur when toggling betwee...

Page 320: ... H L L Pin 13 LDAC1 L H L Pin 12 LDAC2 H H L Pin 11 LDAC3 L L H Pin 10 H L H Pin 9 LTIMER L H H Pin 7 LADC_REG1 H H H Table 8 10 Demultiplexer A3U500 Truth Table Selected Output Line IA0 IA1 IA2 Pin 15 LSENSE_KBD L L L Pin 14 LINT_PRIOR H L L Pin 13 LADC_DATA1 L H L Pin 12 LDAC_DATA0 H H L Pin 11 HCNTR_LD0 L L H Pin 10 HCNTR_LD1 H L H Pin 9 LRPG_RD L H H Pin 7 LADC_REG0 H H H ...

Page 321: ......

Page 322: ...427 9 IF Section ...

Page 323: ...rformance Tests page 442 Log Amplifier P O A4 Assembly page 443 Log Amplifier page 443 Linear Amplifiers page 444 Video Offset page 447 Video Output page 447 Frequency Counter Prescaler Conditioner page 448 AM FM Demodulator page 448 4 8 kHz IF Filters page 449 10 7 MHz IF Filters page 450 4 8 kHz and 10 7 MHz IF Filters page 450 10 6952 MHz VCXO page 451 Input Switch page 451 LO Switch page 452 S...

Page 324: ...Unlock at Beginning of IF Adjust page 470 Inadequate CAL OSC AMPTD Range page 471 300 Hz to 3 kHz Resolution Bandwidth Out of Specification page 472 Low Pass Filter page 478 Sweep Generator page 479 AM FM Demodulation Audio Amplifier and Speaker page 479 ...

Page 325: ...rement The 8562A and 8560A Series spectrum analyzers are much slower when using the diagnostics program For required hardware and instructions on how to load the 8564E 8565E adjustment diagnostic software refer to Chapter 2 Adjustment Diagnostic Software The diagnostic software can be used to quickly isolate a number of common problems that might cause the spectrum analyzer to fail Carefully follo...

Page 326: ...ol 2 Set the 8564EC or 8565EC to external trigger and press SGL SWP CAL and IF ADJ OFF 3 Using a second spectrum analyzer look at the output of the cal oscillator at A4J8 Set the second spectrum analyzer to external trigger positive edge and use the signal at A4U104 pin 2 with ground connection at A4U104 pin 10 to externally trigger the second spectrum analyzer A 20 pin IC clip is recommended to a...

Page 327: ...lay on the second spectrum analyzer should be similar to that shown in Figure 9 6 on page 434 9 If the cal oscillator is not sweeping check the output of the sweep generator circuit A4U804 pin 8 of function block Z A series of negative going parabolas should occur Frequency and amplitude vary depending on the sweep width chosen Table 9 1 lists the RANGE MA0 and MA1 values for the sweep widths Tabl...

Page 328: ...Chapter 9 433 IF Section Troubleshooting Using the Diagnostic Software Figure 9 3 CAL Oscillator Swept Output 20 kHz Width Figure 9 4 CAL Oscillator Swept Output 10 kHz Width ...

Page 329: ...434 Chapter9 IF Section Troubleshooting Using the Diagnostic Software Figure 9 5 CAL Oscillator Swept Output 4 kHz Width Figure 9 6 CAL Oscillator Swept Output 2 kHz Width ...

Page 330: ...ain Checks Using the up down arrow select Gain checks in the IF diagnostics menu An 3335A synthesizer level generator is used as a stimulus and a spectrum analyzer is used to measure the response The gain of each stage is measured and compared to limits An asterisk will appear at the points of failure An indicates a measurement error bad setup GPIB not responding test equipment error or major fail...

Page 331: ...asure the response The symmetry adjustment range and the bandwidth adjustment range are measured for each pole The Xtal pole selection menu allows selection using the up down arrows Select All Poles first unless a particular pole is suspected to have failed An asterisk will appear at the points of failure An indicates a measurement error bad setup GPIB not responding test equipment error or major ...

Page 332: ...possible IF adjustments and LO adjustments are made with the most recent IF parameter variables used as the starting point If FULL IF ADJ is selected All possible IF adjustments are made with the most recent IF parameter variables used as the starting point FULL IF ADJ is located in the CAL menu If ADJ CURR IF STATE is selected All amplitude data and some resolution bandwidths are adjusted The ban...

Page 333: ...d 30 dB attenuation relative to maximum gain 4 Fine Attenuator for 32 evenly spaced DAC settings c Log Amplifier Slopes and Fidelity 1 Wideband RES BW 300 kHz through 2 MHz and Narrowband modes RES BW 300 Hz through 100 kHz 2 10 dB division and 2 dB division log expand modes d Linear Scale Gains On the log amplifier assembly P O A4 e Peak Detector Offsets both Positive and Negative Peak Detectors ...

Page 334: ...dwidth d 1 kHz resolution bandwidth bandwidth e 300 Hz resolution bandwidth bandwidth f Gain of all resolution bandwidth relative to the 300 kHz RES BW 4 Digital Bandwidths 1 Hz through 100 Hz 10 Hz through 100 Hz if Option 103 a VCXO final LO tuned to align digital bandwidths with crystal bandwidth center frequency b Overall gain c Gain variation with input frequency Requirements For the Automati...

Page 335: ...ment The references against which the Automatic IF Adjustment routine aligns are 10 MHz reference A15 Linear scale fidelity especially the 10 dB gain stage in A4 linear amplifier block 15 dB reference attenuator A5 Cal Oscillator output power A4 ...

Page 336: ... at input A5J3 for displaying a signal at top screen with 10 dB input attenuation and a 0 dBm reference level Isolate IF gain problems on the log amplifier assembly A4 with the following steps 1 On the 8564EC or 8565EC spectrum analyzer press PRESET SPAN ZEROSPAN FREQUENCY 1 GHz AMPLITUDE 50 dBm 2 Press CAL and IF ADJ OFF 3 Disconnect cable W27 coax 3 from A5J5 and connect cable W27 to the output ...

Page 337: ...ion bandwidth problems are a result of A5 IF assembly failures The resolution bandwidths are adjusted in the following sequence using 300 kHz as the reference 1 MHz 2 MHz 100 kHz 30 kHz 10 kHz 3 kHz 1 kHz 300 Hz 100 Hz 30 Hz 10 Hz 3 Hz and 1 Hz The 3 Hz and 1 Hz bandwidths are not available with Option 103 If the IF adjustment routine encountered an error the previously adjusted resolution bandwid...

Page 338: ...ge to the spectrum analyzer or the probe Log Amplifier Refer to function blocks K L and AE of A4 Log Amplifier Schematic Diagram sheets 3 of 4 and 4 of 4 in the 8560 E Series Spectrum Analyzer Component Level Information The log amplifier receives the detected video signal from the Detector Mixer and outputs a voltage proportional to the log of the input voltage The linear output is tapped off at ...

Page 339: ...ow mode 9 Repeat steps 2 through 7 10 If log fidelity is poor near the bottom of the screen or the 1 MHz resolution bandwidth is narrow a fault might exist in the wide narrow filter switch Refer to function block G of A4 log amplifier schematic diagram in the 8560 E Series Spectrum Analyzer Component Level Information Check this switch as follows a Monitor voltages on A4U302 pins 1 and 7 while cha...

Page 340: ...rol line LIN_20B The gain of A4U201E can be increased by either 10 dB or 20 dB with the control lines LIN_10 or LIN_20A respectively The gain can be selected by setting the reference level of the 8564EC or 8565EC spectrum analyzer Table 9 2 IF Gain Application Guidelines ATTEN 10 dB Power into A4J3 Reference Level Gain of A4U201C Pin 8 in Pin 3 out Gain of A4U201E Pin 3 in Pin 10 out Total Gain 6 ...

Page 341: ... AMPTD UNITS dBm and AMPLITUDE 2 Disconnect W27 coax 3 from A4J3 and connect the output of a signal generator to A4J3 3 Set the signal generator controls as follows Amplitude 6dBm Frequency 10 7MHz 4 Simultaneously decrease the signal generator output and 8564EC or 8565EC spectrum analyzer REF LVL in 10 dB steps to 90 dBm At each step the signal displayed on the spectrum analyzer should be within ...

Page 342: ...dBm At each step the signal displayed on the spectrum analyzer should be close to the reference level 5 Reconnect W27 coax 3 to A4J3 and cycle the spectrum analyzer power Press STOP REALIGN when it appears 6 On the 8564EC or 8565EC spectrum analyzer press SWEEP SINGLE CAL and IF ADJ OFF 7 The offset DAC A4U102 pin 2 should now be at its default value of approximately 2 45 V The voltage at U601 pin...

Page 343: ...mplifier schematic diagram sheet 4 of 4 in the 8560 E Series Spectrum Analyzer Component Level Information The frequency counter prescaler conditioner divides the frequency by two and then attenuates it The circuit consists of frequency divider U703A and an output attenuator The frequency divider turns on only when the instrument is counting AM FM Demodulator Refer to function block R of A4 Log Am...

Page 344: ...and inject a 10 7 MHz signal of 20 dBm into A4J3 3 Fine tune the frequency of the signal generator to center the signal on the screen Set the signal generator to sweep one 2 kHz span about this center frequency Press SGL SWP on the 8564EC or 8565EC spectrum analyzer 4 Set another spectrum analyzer such as the 8566A B to 4 8 kHz center frequency and 2 kHz span CAUTION If a dc block is not used dama...

Page 345: ...llows Center frequency 10 7MHz Span 2kHz Reference level 10dBm Sweep Single 7 Press TRACE A CLEAR WRITE on the 8566A B 8 Trigger a sweep on the signal generator and on the 8566A B simultaneously The 8566A B should display a 3 dB bandwidth of approximately 500 Hz 9 Reconnect W27 coax 3 to A5J5 and W29 coax 7 to A5J3 4 8 kHz and 10 7 MHz IF Filters 1 On the 8564EC or 8565EC spectrum analyzer press P...

Page 346: ...Hz voltage controlled crystal oscillator VCXO is to provide an LO for down converting the peak of the 10 7 MHz IF filter passband to 4 8 kHz Since the peak of the passband of the 10 7 MHz IF filters is 10 7 MHz 300 Hz the frequency of the VCXO is between 10 6949 MHz and 10 6955 MHz This frequency can best be measured at the collector of A4Q202 The center frequency of the 300 Hz resolution bandwidt...

Page 347: ...h flows through the limiter and LO amplifier The path flowing through the limiter generates the LO for the detector mixer block The path through the isolation amplifier drives the RF port To troubleshoot this group of circuits set the RBW to 300 kHz Inject 10 7 MHz at 6 dbm into J3 Probe the gate of A4Q404 or A4Q405 with a scope Look for a 0 to 3 V square wave Decrease the input power from 6 dBm t...

Page 348: ...input of the limiter and causing loop oscillations In addition the isolation amplifier matches the phase of the non limited signal path to the phase of the limited signal path The isolation amplifier should have a gain of about 4 dB and also has a log narrow filter that is switched with the control line NARROWB Detector Mixer Refer to function block J of A4 log amplifier schematic diagram sheet 3 ...

Page 349: ... is then This gives an offset independent gain measurement Video MUX The video MUX switches the video output between linear log and 4 8 kHz IF for digital RBWs The demod video is an unused feature The easiest way to troubleshoot this circuit is to look for blown FETs Bad FETs are characterized by having significant gate current Only one of the signal lines LIN_VIDEO IF_VIDEO or LOG_VIDEO should be...

Page 350: ... loss in the front end Fixed gain amplifiers shift the signal levels to lower the noise of the IF chain The assembly has two variable attenuators The fine attenuator provides the 0 1 dB reference level steps The reference 15 dB attenuator provides a reference for automatic adjustment of the step gain amplifiers and the log amplifier The reference 15 dB attenuator also provides gain for changes in ...

Page 351: ...ound The 8564EC or 8565EC spectrum analyzer power supply current limiting cannot protect the resistors in series with the power supply NOTE Some transistors have collectors connected to the case Electrical connection of the case to the collector might not be reliable making collector voltage measurements on the transistor case unreliable IF Signature 1 Disconnect W27 coax 3 from A5J5 2 Connect an ...

Page 352: ...taneously press SINGLE on the 8566A B and ADJ CURR IF STATE on the 8564EC or 8565EC spectrum analyzer The IF signature is displayed on the 8566A B display It may be necessary to experiment with different time intervals between initiating the sweep on the 8566A B and initiating the current IF state adjustment on the 8564EC or 8565EC spectrum analyzer 12 Compare the IF signature to the signature of ...

Page 353: ...iled IF signatures of a properly operating 8564EC or 8565EC spectrum analyzer It may be necessary to experiment with different time intervals between initiating the sweep on the 8566A B and initiating the current IF state adjustment on the 8564EC or 8565EC spectrum analyzer to obtain the waveforms shown Note the changes in the 8566A B video bandwidth and sweep time 13 Reconnect W27 coax 3 to A5J5 ...

Page 354: ...Chapter 9 459 IF Section A5 IF Assembly Figure 9 9 Detailed IF Adjust Signature 1 Figure 9 10 Detailed IF Adjust Signature 2 ...

Page 355: ...460 Chapter9 IF Section A5 IF Assembly Figure 9 11 Detailed IF Adjust Signature 3 Figure 9 12 Detailed IF Adjust Signature 4 ...

Page 356: ...Chapter 9 461 IF Section A5 IF Assembly Figure 9 13 Detailed IF Adjust Signature 5 ...

Page 357: ...e 459 is flat Suspect the second step gain stage Entire signature noisy If the signature resembles Figure 9 14 on page 463 suspect a broken first step gain stage or a break in the signal path in the input switch first crystal pole or second crystal pole Correct shape but noisy If the signature resembles Figure 9 15 Noise with Correct Shape suspect the second crystal pole output amplifier Amplitude...

Page 358: ...Chapter 9 463 IF Section A5 IF Assembly Figure 9 14 Noisy Signature Figure 9 15 Noise with Correct Shape ...

Page 359: ...464 Chapter9 IF Section A5 IF Assembly Figure 9 16 Region B Amplitude Variation Figure 9 17 Region B Amplitude Offset ...

Page 360: ... spectrum analyzer connect the 300 MHz CAL OUTPUT to the INPUT 50Ω 3 If the trace flatness is not within 2 5 dB a failure probably exists 4 A trace similar to Figure 9 18 on page 465 indicates a crystal short failure 5 Press SPAN to set the spectrum analyzer to 3 MHz A trace that slopes across the screen see Figure 9 19 Faulty LC Pole indicates a failed LC pole To isolate the broken pole refer to ...

Page 361: ...on functioning pole with the IF signature Region E of Figure 9 13 on page 461 illustrates the four LC pole adjustments Take several signatures to examine the LC pole adjustments If one of the four sections of Region E is consistently longer than the others the corresponding LC pole is faulty IF gain compression FET transistors Q301 Q303 Q700 and Q701 can deteriorate with age Measuring less than 0 ...

Page 362: ... On the 8564EC or 8565EC spectrum analyzer connect the 300 MHz CAL OUTPUT to the INPUT 50Ω 4 A trace similar to Figure 9 20 Faulty Crystal Symmetry indicates a failed crystal symmetry circuit Narrow 10 kHz resolution bandwidth Check for printed circuit board contamination Clean the board as required IF Gain Compression in 10 kHz resolution bandwidth FET transistors Q202 Q203 Q501 and Q503 can dete...

Page 363: ...t W29 coax 7 from A5J3 and W27 coax 3 from A5J5 4 Inject a 5 dBm 10 7 MHz signal into A5J3 5 Monitor the output of A5J5 with another spectrum analyzer 6 Simultaneously decrease the signal generator output and 8564EC or 8565EC spectrum analyzer reference level in 10 dB steps down to a 50 dBm reference level 7 At each step the signal displayed on the other spectrum analyzer should be close to 10 dBm...

Page 364: ...width filters 30 kHz through 1 MHz Adjust 3 dB bandwidth symmetry and gain of the crystal resolution bandwidth filters 300 Hz through 10 kHz The cal oscillator uses a phase locked loop PLL The oscillator function block X is locked to the instrument 10 MHz reference The reference divider function block U divides the reference and delivers a 100 kHz TTL signal to the phase detector function block V ...

Page 365: ...0 seconds after the instrument is turned on assuming the rest of the instrument is working correctly Immediately observe the lower right corner of the display for error messages If the message ERR 499 CAL UNLK appears before errors ERR 561 ERR 562 and ERR 565 the cal oscillator is unable to phase lock Expect to see the ERR 499 message for only about 1 second 2 If the 8564EC or 8565EC spectrum anal...

Page 366: ...e signal level is correct at both settings troubleshoot the A5 IF assembly If the signal level is incorrect continue with step 7 7 Troubleshoot the ALC loop on this assembly using the following steps a Connect a positive DVM probe to A4J9 pin 4 b On the 8564EC or 8565EC spectrum analyzer press CAL c Press FULL IF ADJ Observe the DVM reading between the displayed messages IF ADJUST STATUS 300 kHz R...

Page 367: ...ble to the 8564EC or 8565EC spectrum analyzer front panel PROBE POWER connector you may need to use a probe power extension cable 10131B 8 Press INSTR PRESET on the 8566A B and set the controls as follows Center frequency 10 8MHz Span 0Hz Reference level 43dBm Resolution bandwidth 100kHz Video bandwidth 10kHz Sweep time 50ms Scale 1 dB division Sweep SINGLE 9 On the 8564EC or 8565EC spectrum analy...

Page 368: ...trum analyzer press FULL IF ADJ When the message IF ADJUST STATUS 1 kHz RBW appears press SINGLE on the 8566A B 17 Figure 9 23 Output Waveform 1 kHz Resolution Bandwidth illustrates normal operation Severe failures slope error greater than 30 percent and subtle 3 kHz resolution bandwidth errors less than 30 percent indicate a problem with A4U802 U803 U804 or U106 18 On the 8564EC or 8565EC spectru...

Page 369: ...474 Chapter9 IF Section Cal Oscillator P O A4 Assembly Figure 9 21 Output Waveform 10 kHz Resolution Bandwidth ...

Page 370: ...Chapter 9 475 IF Section Cal Oscillator P O A4 Assembly Figure 9 22 Output Waveform 3 kHz Resolution Bandwidth ...

Page 371: ...476 Chapter9 IF Section Cal Oscillator P O A4 Assembly Figure 9 23 Output Waveform 1 kHz Resolution Bandwidth ...

Page 372: ...Chapter 9 477 IF Section Cal Oscillator P O A4 Assembly Figure 9 24 Output Waveform 300 Hz Resolution Bandwidth ...

Page 373: ...564EC or 8565EC spectrum analyzer press CAL 3 Press FULL IF ADJUST Observe the DVM reading between the displayed messages IF ADJUST STATUS 300 kHz RBW and IF ADJUST STATUS 3 kHz RBW During this time period the voltage should be within a 2 to 10 Vdc range 4 Observe the DVM reading while IF ADJUST STATUS AMPLITUDE is displayed The reading should be within the 2 to 10 Vdc range 5 If the DVM reading i...

Page 374: ... the sweep The ramp from A4U804B is added to the current in A4R802 via A4U803B Integrating this ramp results in the parabolic output waveform AM FM Demodulation Audio Amplifier and Speaker Refer to function blocks R S and T of A4 Log Amplifier Schematic sheet 4 of 4 Diagram in the 8560 E Series Spectrum Analyzer Component Level Information If the audio circuits are not functioning use the followin...

Page 375: ...ighest volume levels 6 If the audio is not working correctly monitor the signal at A4U704 pin 3 with an oscilloscope The signal should be 20 mV peak to peak 25 percent with 2 5 V of dc bias If the signal measures outside these limits the fault is prior to the audio amplifier block T 7 If the signal is correct troubleshoot the audio amplifier and speaker ...

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Page 379: ...487 10 Controller Section ...

Page 380: ...or waveforms make ground connections to A2TP3 The metal board standoffs are not grounded and should not be used when taking measurements Figure 10 1 on page 489 shows the location of the A2 test connectors Frequency Count Marker Problems page 503 Frequency Counter page 505 Video Input Scale Ampli ers and Limiters page 509 12 Bit Flash ADC page 511 32 K Byte Static RAM page 512 Reference Clock page...

Page 381: ...Chapter 10 489 Controller Section Introduction Figure 10 1 A2 Test Connectors Figure 10 2 A2 Test Connector Pin Locations ...

Page 382: ...e A2 controller assembly 1 Disconnect W53 from A2J13 2 Connect the output of a synthesized source such as an 3335A to A2J13 3 Set the synthesized source to the following settings Amplitude 10dBm Frequency 5 35MHz 4 Set the spectrum analyzer to the following settings Center frequency 300MHz Span 1MHz 5 On the spectrum analyzer press FREQ COUNT The frequency counter actually reads one half the frequ...

Page 383: ...generate a 2 MHz timebase This timebase feeds through the clock select multiplexer in U35 to the CLK2 input of programmable timer U15 The output OUT2 of programmable timer U15 is the gating signal HBKT_PULSE it performs the frequency count The gating time interval is a function of the counter resolution which may be set between 10 Hz and 1 MHz Table 10 1 on page 506 lists the gate time for each se...

Page 384: ...ignal at A2J2 pin 21 This is an output of the frequency counter HBUCKET PULSE d If HBUCKET PULSE is stuck high troubleshoot the frequency counter 3 Check for a 10 MHz signal at A15J302 If the signal is not present at A15J302 the A15 RF assembly is probably defective Table 10 1 Gate Times Counter Res Gate Time U15 pin 20 low state A2TP16 A2TP15 10 Hz 200 ms 2 MHz 4 18 kHz 100 Hz 20 ms 2 MHz 418 Hz ...

Page 385: ...ground plane is totally isolated from the chassis 1 Press PRESET on the 8560 EC series spectrum analyzer and set the controls as follows Center frequency 300MHz Span 0Hz Reference level 10dBm Log division 10dB DIV Sweep time 20ms 2 Connect the CAL OUTPUT to the INPUT 50Ω connector 3 Adjust the spectrum analyzer reference level to place the signal at the top graticule line on the LCD display 4 Meas...

Page 386: ...Vdc If the level is less more negative than 0 35 Vdc replace voltage clamp D3 11 Measure the dc level of the flash video at pin 2 of R47 The level should be near 0 Vdc with the signal at the bottom graticule line no input to the spectrum analyzer 12 Connect the CAL OUTPUT to the INPUT 50Ω connector 13 Measure the dc level of the flash video at pin 2 of R47 The level should be near 1 7 Vdc ...

Page 387: ...ated from the chassis 1 Press PRESET on the spectrum analyzer and set the controls as follows Center frequency 300MHz Span 0Hz Reference level 20dBm Log division 5dB DIV Sweep time 20ms 2 Connect the CAL OUTPUT to the INPUT 50Ω connector 3 Pins 2 through 13 ADC0 ADC11 of U22 should all be high logic 1 corresponding to an ADC digital count of 255 for the analog input of 2 volts or greater 4 Disconn...

Page 388: ...tic RAM stores the ADC samples that are taken when the Fast ADC circuitry is in the write mode When not in the write mode the static RAM is read by the CPU to retrieve the fast ADC data The 8 bit DFADC bus connects the outputs of latches within U35 to the data port of static RAM U21 ...

Page 389: ...s first passed through a high pass filter consisting of C123 and L15 The the signal passes through a bandpass filter centered at 24 MHz consisting of C106 C08 L13 and R80 The comparator U28B generates a square wave The signal then passes through a second stage of filtering by using the bandpass filter consisting of C89 C88 L12 and R77 Comparator U28A then regenerates the square wave A divide by tw...

Page 390: ...high pass filter consists of R85 C122 and L14 The bandpass filter consists of L19 and C139 The filter basically filters the fourth harmonic of the 4 MHz signal to generate a 16 MHz signal The resulting signal is then passed through comparator U34A to generate a 16 MHz square wave Three more stages consisting of a bandpass filter followed by a comparator further filter the signal so that a clean 16...

Page 391: ...er is left off for more than thirty minutes with low battery voltage the stored states and traces will be lost The following steps test battery backup 1 Measure the voltage on W6 at A2J3 If the voltage is less than 2 6 V check the BT1 battery 2 If the battery voltage is correct reconnect W6 to A2J3 turn the analyzer power off and wait 5 minutes 3 Measure the voltage at A2U19 pin 32and A2U26 pin 32...

Page 392: ...t attenuator changing attenuation value 3 If the display shows the analyzer to be in RMT and the ATTEN value displayed on the LCD changed according to the program the A2 controller assembly is working properly Refer to Chapter 8 ADC Interface Section 4 If there was no response over GPIB the A2 controller is probably defective Be sure to also check the A19 GPIB assembly and A19W1 5 If there was an ...

Page 393: ...ING AMPLIFIERS AND LIMITER POWER SUPPLIES FADC 5VF 5VF 15VF 15VF 8 MHz TTL 8 MHz TTL 4 MHz TTL REF CLOCK 24 MHz CLOCK AND SAMPLE RATE GENERATOR 12 BIT ADC RP FLASH VIDEO ADCO ADC11 DFADCO DFADC7 TIMING AND CONTROL BUS TIMING AND CONTROL BUS AFADCO AFADC14 MEMORY ADDRESS BUS P2 P7 IOB2 IOB7 IOB DATABUS IOBO IOB15 IOBO IOB7 FADC CONTROL FADC CONTROL HSWP J1 6 HP IB J7 J1 INTERFACE CABLE A3 OPTION MO...

Page 394: ...521 11 Synthesizer Section ...

Page 395: ... Oscillator page 547 Operation page 547 Troubleshooting page 547 Unlocked YTO PLL page 551 Operation page 551 Troubleshooting an Unlocked YTO PLL page 553 Unlocked Fractional N PLL page 560 Operation page 560 Confirming an Unlocked Condition page 560 Fractional N PLL page 561 Frequency Span Accuracy Problems page 568 Determining the 1st LO Span page 568 Confirming Span Problems page 569 YTO Main C...

Page 396: ...ctive probe such as an 85024A with a spectrum analyzer is recommended for troubleshooting the RF circuitry If an 1120A active probe is being used with a spectrum analyzer such as the 8566A B or 8569A B having dc coupled inputs either set the active probe for an ac coupled output or use a dc blocking capacitor 11240B between the active probe and the spectrum analyzer input Some spectrum analyzers c...

Page 397: ...suspected faulty circuits use Table 11 1 on page 525 to determine which procedure to perform Figure 11 1 illustrates test connector locations on the A14 and A15 assemblies The pin locations of a 16 pin test connector are indicated in Figure 11 2 on page 525 Figure 11 1 A14 and A15 Assembly Test Connectors ...

Page 398: ...l N oscillator Unlocked YTO PLL steps 13 17 3rd LO drive Third LO Driver Amplifier 100 MHz VCXO steps 1 6 10 MHz signal at other input to reference PLL Unlocked Reference PLL steps 12 and 13 phase frequency detector Sampling oscillator tune voltage Confirming a Faulty Synthesizer Section steps 1 4 A14 frequency control assembly Confirming a Faulty Synthesizer Section steps 12 18 A14J301 10 MHz REF...

Page 399: ...ocked Reference PLL steps 17 22 Path to offset PLL phase frequency detector Unlocked YTO PLL steps 3 7 14 19 Sampler drive output of A7 Unlocked YTO PLL steps 18 21 Sampler IF Unlocked YTO PLL steps 22 26 Sampler sampler IF operation Sampler and Sampler IF steps 1 15 Span attenuator 1st LO Span Problems All Spans steps 6 13 Sweep generator Sweep Generator Circuit Sweep tune multiplier YTF Driver C...

Page 400: ...et to 0 Hz even though it is still possible to sweep the Main and FM coils of the YTO With the YTO in its unlocked conditions and the SPAN set to 0 Hz the nominal YTO frequency is not necessarily the value listed as LO FREQ in the Frequency Diagnose menu The YTO has an initial pretune accuracy of 20 MHz To display the nominal YTO frequency press CAL MORE 1 OF 2 FREQ DIAGNOSE LO FREQ The fractional...

Page 401: ...l is produced NOTE The frequency control board is digitally controlled If multiple failures appear in unrelated areas of the circuitry the control may be at fault Refer to the troubleshooting procedures in this chapter for further help on isolating those failures Check Sampling Oscillator Tune Voltage steps 1 4 1 Connect the positive lead of a DVM to A15J200 pin 13 and the negative lead to A15J200...

Page 402: ... analyzer to the following settings Center frequency 10MHz Span 2MHz 7 The amplitude of the 10 MHz reference signal should measure 1 dBm If the signal does not measure 1 dBm troubleshoot the A15 10 MHz distribution and A21 OCXO If not Option 103 8 Reconnect W37 to A14J301 Check 1st LO steps 9 11 9 Connect the CAL OUTPUT to INPUT 50Ω Table 11 2 Center Frequency Tuning Values 8564EC and 8565EC Cente...

Page 403: ...t each step e Make sure that the A11 YTO output power is between 9 and 13 dBm f Set jumper A14J23 to the NORM position and reconnect the A11 YTO Check A14 frequency controlassembly steps 12 18 12 On the spectrum analyzer press PRESET SPAN ZERO SPAN CAL MORE 1 OF 2 FREQ DIAGNOSE and FRAC N FREQ Note the fractional N oscillator frequency Ignore the minus sign if present 13 Check A14J304 FRAC N TEST ...

Page 404: ...igure 11 3 YTO Loop Test Setup Check A15 RF assembly steps 19 25 19 Disconnect W34 from A15U100J1 and disconnect W32 from A15J101 20 Connect a frequency counter to A15J101 Connect a high frequency test cable from an 8340A B synthesized sweeper to A15U100J1 See Figure 11 4 on page 532 21 Connect a BNC cable from the spectrum analyzer 10 MHz REF IN OUT to the 8340A B FREQUENCY STANDARD EXT input 22 ...

Page 405: ... the frequencies listed in the table If the frequency counter does not read the indicated sampler IF 10 kHz suspect the A15 RF assembly 26 Reconnect W34 to A15U100J1 and W32 to A15J101 27 The 1ST LO OUTPUT located on the front panel must be terminated in 50Ωs If the YTO unlocks only with certain center frequency and span combinations check that the termination is in place 28 Set the spectrum analy...

Page 406: ...Hz Counter Reading Sampler IF MHz 6 067000 2156 3 285 000 82 000 6 087000 2176 3 286 364 73 364 6 110200 2199 5 287 500 72 700 6 141000 2230 3 288 462 83 308 4 710000 799 3 288 889 87 778 6 174000 2263 3 290 000 84 000 6 193000 2282 3 290 909 83 909 6 213000 2302 3 291 667 88 000 6 066000 2155 3 292 500 76 500 6 069000 2158 3 293 478 94 044 6 247000 2336 3 294 444 63 667 6 107000 2196 3 295 000 88...

Page 407: ...oblems on a generalized PLL PLL Locked at Wrong Frequency Numbers in the following text identify items in Figure 11 5 on page 535 Any frequency errors at reference 1 will be multiplied by N M on the PLL output A sampler reference frequency error 2 will be multiplied by its harmonic on the PLL output A mixer reference frequency error 3 produces the identical error on the PLL output If divider input...

Page 408: ...outside the PLL Troubleshoot this problem by working backward from the oscillator as described in the steps below Numbers in the following text identify items in Figure 11 6 on page 536 1 The loop integrator output voltage 1 should be attempting to tune the oscillator to the correct frequency The voltage at 1 should increase as the frequency increases on all of the PLLs ...

Page 409: ... detector 2 are attempting to tune the oscillator in the correct direction 3 If the phase detector output is bad check the inputs to the detector 3 One input should be higher in frequency than the other this should match the phase detector outputs 4 Confirm proper power levels for the signals at the input to the N dividers 4 the reference inputs 5 and 7 and the loop feedback path 6 PLL Measurement...

Page 410: ...ler output is within tolerance suspect the doubler circuitry Refer to function block S of the A15 RF schematic sheet 2 of 4 3 If the tripler output is too low probe the output of A15U700 RF amplifier The level should be 16 5 dBm 2 dB The level at the input of A15U700 should be 8 5 dBm 2 dB 4 If the level at the input of A15U700 is too low suspect a faulty 100 MHz VCXO Refer to function block Q of ...

Page 411: ...s signal should be TTL levels at 10 MHz with a 60 percent duty cycle 14 If TTL level signals approximately 10 MHz are not present check signals backwards through the loop to find a fault in the signal path 15 Measure the signals at the following test points with an active probe spectrum analyzer combination 16 If an approximately 10 MHz TTL signal is present at U502 pin 11 with 60 percent duty cyc...

Page 412: ...et 2 of 4 Check the 100 MHz lock loop integrator steps 23 27 23 Remove 10 MHz reference input to the phase frequency detector by pressing AUX CTRL REAR PANEL and 10 MHz EXT No signal should be connected to the rear panel 10 MHz REF IN OUT connector NOTE The outputs of phase frequency detector are low pass filtered to reduce the 10 MHz component of the signal The filtered signals are then integrate...

Page 413: ...ort across the PIN diode CR503 If the signal level at the CAL OUTPUT is still less than 10 dBm with CR503 shorted out troubleshoot the RF forward path through amplifier Q505 The signal amplitude decreases If the CAL OUTPUT signal level is greater than 10 dBm troubleshoot the PIN diode attenuator the detector or the feedback path 29 Measure the detector voltage at A15J502 pin 14 The voltage should ...

Page 414: ...is installed Use an active probe spectrum analyzer combination to confirm the power level of the 300 MHz signal at the following test points 2 If the signal at A15X602 pin 5 is low but the signal at A15TP504 is correct press AUX CTRL INTERNAL MIXER Press SIG ID OFF if present 3 Check that PIN diode switches CR603 and CR605 are reverse biased by approximately 10 Vdc Refer to function block F of A15...

Page 415: ...age 548 lists the prescaler and postscaler divide numbers in the offset loop reference divide chain for each of the 16 discrete frequencies to which the offset lock loop may be set It also indicates what the reference frequency into the phase frequency divide chain is Refer to function block AN of A15 RF schematic block 3 of 4 Troubleshooting Check loop references steps 1 and 2 1 Use an active pro...

Page 416: ...matic sheet 3 of 4 10 Measure the 296 MHz loop feedback signal at the following test point A15TP402 7 dBm Table 11 4 Sampling Oscillator PLL Divide Numbers Sampling Oscillator Frequency MHz Center Frequency MHz Reference Divide Chain Reference Frequency MHz Prescaler Postscaler 285 000 2156 3 10 2 15 000 286 364 2176 3 11 2 13 636 287 500 2199 5 8 3 12 500 288 462 2230 3 13 2 11 538 288 888 799 3 ...

Page 417: ...nd should be less than 0 6 V and greater than 2 2 V 16 Disconnect the jumper from X201 pins 1 and 5 Disconnect the dc power supply which is connected to A15J200 pin 16 17 Set the spectrum analyzer to the following settings Center frequency 300MHz Span 0Hz 18 Use an oscilloscope to confirm the presence of a 4 MHz TTL level reference frequency signal at U406 pin 11 19 Connect a short across A15R425 ...

Page 418: ... nearest C441 to the end of R460 nearest C443 This changes the loop integrator into a voltage follower Refer to function block AB of A15 RF schematic sheet 3 of 4 23 Check the voltages at the following points 24 If the voltages are not correct suspect A15U408 25 Remove the jumpers A15U408 pin 6 2 5 Vdc approximately A15X201 pin 1 2 5 Vdc approximately ...

Page 419: ...erate the sampler IF frequency As a result the frequency of the sampler IF is determined by the following equation Where FIF is the sampler IF FYTO is the YTO frequency N is the desired sampling oscillator harmonic FSAMP is the sampling oscillator frequency Notice that FIF can be positive or negative depending upon whether the sampling oscillator harmonic used is less than or greater than the YTO ...

Page 420: ...ity In fractional N spans LO Spans 2 MHz the YTO remains locked to the sweeping fractional N PLL Thus the sampler IF must always equal the fractional N oscillator frequency conditions for lock Since the YTO must always sweep up in frequency for negative sampler IFs the fractional N oscillator must sweep from a higher frequency to a lower frequency This is necessary since an increasing YTO frequenc...

Page 421: ...O error voltage is forced to zero 3 On the spectrum analyzer press CAL MORE 1 OF 2 FREQ DIAGNOSE and LO FREQ The displayed LO FREQ is the desired YTO frequency calculated Record the calculated YTO frequency below 4 Measure the YTO frequency at the front panel 1ST LO OUTPUT jack and record below Table 11 5 Amplifier Polarities YTO Error Sign Amplifier ERRSGN A14U313 pin 19 Fractional N Positive Pos...

Page 422: ...error YTO frequency MEASURED YTO frequency CALCULATED 6 On the spectrum analyzer press MORE 1 OF 2 FREQ DIAGNOSE and FRAC N FREQ Record the fractional N frequency below 7 If the YTO frequency error recorded in step 5 is greater than 20 MHz do the following Check the YTO adjustments using the automated adjustment in Chapter 2 or the manual adjustment in Chapter 3 YTO Frequency Error _______________...

Page 423: ...particularly the YTO main coil adjustments If available use a synthesized microwave spectrum analyzer instead of the microwave frequency counter specified in the adjustment procedure 10 If the YTO main coil cannot be adjusted proceed to step 33 to troubleshoot the main coil coarse and fine DACs and main coil tune DAC 11 The front panel 1ST LO OUTPUT should measure between 14 5 and 18 5 dBm in ampl...

Page 424: ...e NORMAL position and reconnect W34 to A15U100J1 Check sampler IF steps 22 26 22 Set the spectrum analyzer to the following settings Center frequency 300MHz Span 0Hz 23 Place A14J23 jumper in the TEST position 24 Disconnect W32 from A15J101 Monitor the sampler IF output A15J101 SAMPLER IF with a synthesized spectrum analyzer such as an 8568A B or 8566A B 25 The sampler IF should measure between 46...

Page 425: ...15 the analyzer firmware controls the gain during the locking process The error voltage is read by the ADC on the A3 interface assembly U324D calibrates out any offsets from true ground A14U326A inverts the sense of the YTO loop to lock the YTO on lower sampler sidebands YTO frequency sampler frequency sampler harmonic The fractional N frequency indicated in the FREQ DIAGNOSE menu will be negative...

Page 426: ... range is 0 to 255 Center frequency 300 MHz Span 0Hz Trigger SINGLE EXT with no external trigger connected 43 Press SAVE PWR ON STATE and turn off the spectrum analyzer 44 Place A14J23 jumper in the TEST position and turn on the spectrum analyzer 45 Verify the voltages listed in Table 11 7 on page 558 46 Place A14J23 jumper in the NORMAL position Check main coil tune DAC steps 47 49 47 Set the spe...

Page 427: ...f 5 50 If the spectrum analyzer center frequency is 300 MHz the voltage at A14J18 pin 3 should measure 3 35 V 0 25 V The voltage may also be determined from the following equation V 1st LO Frequency 2 95 GHz 2 654 V GHz 51 The voltage at A14U330 pin 2 should measure 3 4 V 0 2 Vdc This represents a current setting the YTO to approximately 2 95 GHz 52 Return A14J23 jumper to the NORMAL position ...

Page 428: ...hat will be measured at A14J304 with the spectrum analyzer in zero span Confirming an Unlocked Condition 1 Set the spectrum analyzer to the following settings Center frequency 300MHz Span 0Hz 2 Connect A14J304 FRAC N TEST to the input of a synthesized spectrum analyzer and view the fractional N PLL output at 66 7 MHz NOTE If a synthesized spectrum analyzer is not available connect A14J304 to the i...

Page 429: ...gnal for the fractional divider and is required for the fractional divider to operate At the start of a fractional N sweep the fractional divider is set to a value for the start frequency and a sweep rate It then sweeps for as long as HSCAN is high Use the following procedure to troubleshoot unlocked loop problems or problems of locking to the wrong frequency by less than 1 MHz 1 Check the two LED...

Page 430: ... Divider or integrator Divider or integrator VCO clamp Measured expected VCO clamp Divider or integrator Divider or integrator VCO VCO clamp Measured not oscillating VCO clamp VCO VCO VCO VCO clamp 7 VCO clamp troubleshooting Q131 Q132 and the associated components should limit the tune voltage at R240 to about 3 3 V to 11 V If the integrator its output voltage is on TP13 tries to produce a voltag...

Page 431: ...564 Chapter11 Synthesizer Section Unlocked Fractional N PLL Figure 11 8 VCO Bias Voltages for A14 Assemblies ...

Page 432: ...6 d Use an oscilloscope to view the signal at pin 8 of U112 Its average frequency should be given by f f A14TP5 80 MHz RAW OSC FREQ where f A14TP5 is the frequency measured at TP5 and RAW OSC FREQ comes from step 4 A14TP1 If the frequency is in error the fractional divider block AS is not functioning Check that FRAC N RUN on U113 pin 39 is high e Use an oscilloscope to verify that the signals at N...

Page 433: ...the polarity of the input TP11 The integrator op amp U106 output TP13 should try to go very positive about 12 V if its average input TP12 is positive If its average input is negative it should try to go very negative about 4 V If its average input is zero and it is functioning correctly it may take on any output voltage between 4 V and 12 V ...

Page 434: ...nthesizer section depending on the desired 1st LO span due to harmonic mixing this is not necessarily the same as the span setting of the analyzer Refer to Table 11 12 on page 568 for a listing of sweep signal destinations versus 1st LO spans Sweeping the fractional N oscillator results in sweeping the YTO FM coil There is a one to one relationship between the frequency span of the fractional N as...

Page 435: ... and only LO spans of 2 01 MHz or greater are faulty test YTO linearity by performing step c Test the span in question at different center frequencies in the same band If the span accuracy changes significantly 2 or more suspect the A11 YTO 2 If only 1st LO spans of 2 MHz or less are faulty suspect the A14 fractional N PLL 3 If there are several spans in the main coil and FM coil ranges affected s...

Page 436: ...2 48 V troubleshoot the main coil tune DAC See function block E of A14 frequency control schematic sheet 2 of 5 YTO FM Coil Span Problems LO Spans 2 01 MHz to 20 MHz In YTO FM coil spans the YTO loop is locked and then opened while the sweep ramp is summed into the FM coil The FM coil sensitivity is corrected by changing the sensitivity of the FM coil driver 1 Perform the 7 YTO Adjustment in Chapt...

Page 437: ...tput d Set the dc voltage source output for 0 Vdc and note the 1st LO frequency e Set the dc voltage source output for 10 Vdc The 1st LO frequency should momentarily increase approximately 15 6 MHz f The voltage at A14U332 pin 2 should be approximately 19 of the voltage at A14J23 pin 2 g If the 1st LO frequency did not change in step e press LINE to turn spectrum analyzer off and disconnect W10 fr...

Page 438: ...ollowing settings Center frequency 300MHz Span 20MHz Resolution BW 1MHz Video BW 1MHz Sweep time 50ms 2 Check that there is 0 V to 10 V ramp of 50 ms duration at A14J15 pin 15 3 If a scan ramp is not present refer to Sweep Generator in this chapter 4 If there is a 0 to 10 V ramp at A14J15 pin 14 the fault is probably in the Main FM sweep switch See function block H of A14 frequency control schemat...

Page 439: ...closed 1st LO Span Problems Multiband Sweeps During multiband sweeps the sweep ramp at A14J15 pin 15 should go from 0 V to 10 V for each band or portions of a band covered See function block A of A14 frequency control schematic sheet 1 of 5 in the 8560 E Series Spectrum Analyzer Component Level Information However the scan ramp at A14U325A pin 1 is scaled according to the percentage of the total s...

Page 440: ...574 Chapter11 Synthesizer Section Frequency Span Accuracy Problems Figure 11 9 8564EC Sweep and Scan Ramps Figure 11 10 8565EC Sweep and Scan Ramps ...

Page 441: ...n Locked versus Unlocked Spans Input a signal to the spectrum analyzer Set the center frequency to the input signal frequency set the span to 2 MHz and plot the display This plots the system noise for a locked sweep Plot the display again with a span of 2 01 MHz lock and roll sweep The crossover point of the noise floor of the two plots is typically at an offset of about 50 kHz for a functioning i...

Page 442: ...try associated with the 100 MHz VCXO Fractional N versus Offset PLL or YTO PLL Phase Noise If the spectrum analyzer has excessive noise at 1 kHz offset measure the noise with center frequencies of 100 MHz and 2 5 GHz If the measurements are equal suspect the fractional N circuitry and the YTO loop circuitry on the A14 frequency control assembly If the measurements differ by 2 dB to 5 dB with the 2...

Page 443: ...t to the input of another spectrum analyzer 4 If a 66 7 MHz signal greater than 15 dBm is not displayed on the other spectrum analyzer set a microwave source to the following settings Frequency 4 2107GHz Amplitude 5dBm 5 Connect the microwave source to A15U100J1 A 66 7 MHz signal at approximately 0 dBm should be displayed on the other spectrum analyzer 6 Use an active probe spectrum analyzer combi...

Page 444: ...ce to the following settings Frequency 4 2107GHz Amplitude 5dBm 11 Connect the microwave source to A15U100J1 12 Measure the signal at U103 pin 1 using an active probe spectrum analyzer combination 13 If a 94 7 MHz signal approximately 14 dBm is present but the signal at A15J101 is low suspect U103 14 When U104 pin 3 is at TTL low U104 pin 6 should near 15 Vdc and PIN diodes CR101 CR102 and CR103 s...

Page 445: ...ages on Q3A and Q3B the same These two transistors are matched so their collector currents should be identical when their base emitter voltages are identical The emitter current of Q3B is 200 µA therefore the emitter current of Q3A is 200 µA and the sweep ramp is generated by C14 The sweep time is given by the formula Where V is equal to 10 Volts With a capacitance of 1 µF and a current of 200 µA ...

Page 446: ...e at pin 1 should be 10 mV C times the temperature of the A14 frequency control assembly For example if the ambient temperature is approximately 20 C and the A14 frequency control assembly is 10 C warmer the actual temperature of the A14 assembly is 30 C and U312 pin 1 should measure 300 mV 25 To check the temperature dependent offset voltage generator connect the positive lead of the voltmeter A1...

Page 447: ...Chapter 11 581 Synthesizer Section Sweep Generator Circuit Figure 11 11 Simplified Synthesizer Section ...

Page 448: ...582 Chapter11 Synthesizer Section Sweep Generator Circuit Figure 11 12 Simplified A14 Assembly Block Diagram ...

Page 449: ...Chapter 11 583 Synthesizer Section Sweep Generator Circuit Figure 11 13 Simplified A15 Assembly Block Diagram 100 MHz PLL ...

Page 450: ...stment should typically not be necessary after OCXO replacement and is generally not recommended If adjustment is necessary the spectrum analyzer must be on continuously for a minimum of 24 hours immediately prior to oscillator adjustment to allow both the temperature and frequency of the oscillator to stabilize Failure to allow sufficient stabilization time could result in oscillator misadjustmen...

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Page 454: ...593 12 RF Section ...

Page 455: ...r page 605 A10 YIG Tuned Filter Mixer RYTHM page 608 A12 Switched Barium Tuned Mixer SBTX page 609 A13 Second Converter page 610 A14 Frequency Control Assembly page 612 LO Multiplier Amplifier Drive page 612 Control Latch for Band Switch Drivers page 615 YTF Driver Circuit page 615 A15 RF Assembly page 621 Confirming a Faulty Third Converter page 621 Confirming Third Converter Output page 621 Thir...

Page 456: ...2 RYTHM SBTX microcircuits and the A14 Frequency Control board The test board is labeled µCKT and INSTR SIDE 1 Disconnect W16 from A14J9 and W12 from A14J10 2 Connect W16 to J4 on the test board and W12 to J5 on the test board 3 Connect J2 on the test board to A14J10 use 24 conductor ribbon cable part number 08564 60012 4 Connect J1 on the test board to A14J9 use 20 conductor ribbon cable part num...

Page 457: ...596 Chapter12 RF Section Troubleshooting Using the Diagnostic Software Figure 12 1 Diagnostic Software Connection Locations A14 and A15 ...

Page 458: ...Chapter 12 597 RF Section Troubleshooting Using the Diagnostic Software Figure 12 2 Diagnostic Software Connection Locations RF Section ...

Page 459: ...ibrator Amplitude Adjustment in Chapter 3 A7 LO Multiplier and Distribution Amplifier A7 LO Multiplier and Distribution Amplifier A8 Low Band Mixer A8 Low Band Mixer A9 Input Attenuator A9 Input Attenuator A13 Second Converter A13 Second Converter A13J2 INT 2nd IF A13 Second Converter steps 1 to 6 A14 Latch Control Latch for Band Switch Drivers A15 Control Latches Control Latch for Band Switch Dri...

Page 460: ...in limits but signals are low the RF path following the A8 mixer is probably operating properly 5 If the LO feedthrough amplitude is higher than 5 dBm signal will be clipped at top of screen and signals are low in amplitude suspect a defective A8 mixer assembly 6 If signal amplitudes 2 9 GHz are bad but signals 26 8 GHz are good check the A8 Low Band Mixer or the filter FL1 If both the LO feedthro...

Page 461: ...eck the A12 SBTX 2 If the low band and millimeter band signals are correct but microwave band signals are wrong check the A10 RYTHM 3 Perform the steps located in Control Latch for Band Switch Drivers on page 615 4 Troubleshoot the signal path Refer to the power levels listed in Figure 12 11 on page 631 RF Section Troubleshooting Block Diagram ...

Page 462: ... TEST position Remove W38 from the input of A7 6 Use a power meter or another spectrum analyzer to measure the output of A11 YTO The power should be between 2 dBm and 13 dBm 7 Reconnect W38 to A7 Place the jumper on A14J23 in the NORM position 8 If ERR 334 unlevelled output is present and the A11 YTO power output is correct the A7 drive circuit may be defective Refer to A7 LO Multiplier and Distri...

Page 463: ...panel is not properly terminated into a 50Ω termination Figure 12 3 A14J10 Solder Side of A14 Ignore Pin Numbers on Mating Connector 1 Press LINE to turn the spectrum analyzer off Disconnect W12 from A14J10 2 Connect a jumper between A14J10 pin 5 and A14J19 pin 6 Connect a jumper between A14J18 pin 13 and A14J18 pin 1 See Figure 12 3 on page 602 3 Connect the positive lead of a DVM to A14J18 pin 1...

Page 464: ...correct range refer to the LO Distribution Amplifier Adjustment in Chapter 2 adjustment procedures 12 If the voltage varies between 0 Vdc and 2 Vdc adjust the Gate Bias for a DVM reading within 10 mV of the Gate Bias voltage listed on the A7 label If the voltage does not vary between 0 Vdc and 2 Vdc troubleshoot the A14 Frequency Control Assembly 13 Disconnect the jumper from A14J19 to A14J10 Pres...

Page 465: ... spectrum analyzer check for approximately 21 dBm 300 MHz at the input of A8 This level can easily be measured at the output of FL1 by disconnecting W45 from FL1 5 If the level at the input of A8 is less than 25 dBm suspect FL1 low pass filter A10 RYTHM A12 SBTX or A9 input attenuator Refer to power levels shown on Figure 12 11 on page 631 RF Section Troubleshooting Block Diagram 6 Check for appro...

Page 466: ...er an input attenuator setting of 0 dB the step key will not allow selecting 0 dB input attenuation 5 Monitor the pins of A14U421 with a DVM while setting the input attenuator to the values listed in Table 12 2 on page 606 6 If one or more logic levels listed in Table 12 2 on page 606 is incorrect disconnect W11 from A14J6 and repeat step 5 using Table 12 4 on page 607 NOTE When W11 is disconnecte...

Page 467: ... L L H H L 40 H L H L L H 50 L H H L H L 60 H L H L H L ON OFF ON OFF ON OFF reads 0 2 V floating when W11 is disconnected H 28 V L 0 6 V Table 12 3 Attenuator Control Truth Table W11 connected or disconnected from A14J6 A14U420 ATTEN Setting dB 10 dB 30 dB 20 dB Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 0 H L H L H L 10 L H H L H L 20 H L H L L H 30 L H H L L H 40 L H L H H L 50 H L L H L H 60 L H L H ...

Page 468: ...ntrol Truth Table W11 connected or disconnected from A14J6 A14U421 ATTEN Setting dB 10 dB 30 dB 20 dB Pin 16 Pin 15 Pin 14 Pin 13 Pin 12 Pin 11 0 L F L F L F 10 F L L F L F 20 L F L F F L 30 F L L F F L 40 F L F L L F 50 L F F L F L 60 F L F L F L F Floating 0 2 V L 0 6 V ...

Page 469: ... level measurements A test board part number 08564 69201 is connected between the A7 LOMA and A10 A12 RYTHM SBTX ribbon cables and the A14 frequency control assembly DC measurements are made using the TAM manual probe cable on several test connectors on the test board An 3478A DVM is used to measure the voltage across A14R91 the large power resistor next to A14Q404 to determine the tuning current ...

Page 470: ...ignal level measurements A test board part number 08564 69201 is connected between the A7 LOMA and A10 A12 RYTHM SBTX ribbon cables and the A14 frequency control assembly DC measurements are made using the TAM manual probe cable on several test connectors on the test board An 3478A DVM is used to measure the voltage across A14R91 the large power resistor next to A14Q404 to determine the tuning cur...

Page 471: ...pectrum analyzer should be approximately 38 dBm 6 Remove the test cable from A13J2 and reconnect W35 to A13J2 7 Disconnect W33 coax 81 from A13J4 and connect W33 through a test cable to the input of a second spectrum analyzer 8 Tune the second spectrum analyzer to a center frequency of 600 MHz 9 If a 600 MHz signal is not present or its amplitude is less than 5 dBm the fault is probably on the A15...

Page 472: ...e d Press LINE to turn the spectrum analyzer off Reconnect W13 to A14J12 and press LINE to turn the spectrum analyzer on Set it to the following settings Center frequency 300 MHz Span 0 Hz 12 Move the positive lead of the DVM to A14J19 pin 1 The voltage should measure between 150 mVdc and 800 mVdc If the voltage measures outside this limit the A13 Second Converter is probably defective ...

Page 473: ... the voltages do not measure as indicated check that the voltages at A14J18 pins 5 and 13 are consistent with the output of the operational amplifier NOTE The voltages on A14J18 pins 5 13 and 14 are referred to as LOMA PIN DRV T RYTHM LB SENSE and LOMA INPUT PIN ATTEN respectively 4 Set the spectrum analyzer to the following settings Center frequency 35GHz Span 2 MHz 5 On the spectrum analyzer pre...

Page 474: ...cy Control Assembly If the voltages measure as indicated in step 3 and step 6 measure the A11 YTO output See Figure 12 4 on page 614 If all measurements are within limits refer to A7 LO Multiplier and Distribution Amplifier in this chapter ...

Page 475: ...614 Chapter12 RF Section A14 Frequency Control Assembly Figure 12 4 A7 LO Multiplier Amplifier Drive ...

Page 476: ... blocks Q R S and T on A14 frequency control schematic diagram The FAV generator generates the 0 5 V GHz signal The YTF driver circuitry can be half split by checking the rear panel FAV OUTPUT NOTE The rear panel output changes according to the external mixer mode selected The preselected external mixer mode must not be selected while executing this procedure Make sure that the rear panel output i...

Page 477: ...e The waveform should resemble Figure 12 5 on page 617 4 Set the spectrum analyzer controls as follows Start frequency 8 GHz Stop frequency 10 GHz 5 Monitor A14J15 pin 1 with an oscilloscope The waveform should resemble Figure 12 7 on page 618 6 If the ramp is not correct confirm the operation of the Main Coil Tune DAC and Sweep Generator Refer to Unlocked YTO PLL in Chapter 11 7 Set the spectrum ...

Page 478: ...Chapter 12 617 RF Section A14 Frequency Control Assembly Figure 12 5 8564EC Rear Panel SWP Output Figure 12 6 8565EC Rear Panel SWP Output ...

Page 479: ...618 Chapter12 RF Section A14 Frequency Control Assembly Figure 12 7 8564EC Signal at A14J15 Pin 1 Figure 12 8 8565EC Signal at A14J15 Pin 1 ...

Page 480: ... DVM readings from 0 V to 10 V respectively 15 Set the spectrum analyzer center frequency to 40 GHz and measure the voltage at A14U414 pin 1 V 16 Connect the DVM to A14J16 pin 1 17 Press PRESEL SLOPE 18 Set the DAC to values from 0 to 255 to yield DVM readings from 0 V to the voltage measured in step 15 19 On the spectrum analyzer press CAL and REALIGN LO IF Table 12 5 Sweep Tune Multiplier Values...

Page 481: ...ct the DVM to A14J16 pin 3 21 Change the center frequency in 1 GHz steps and confirm that the voltage changes by 220 mV GHz in microwave bands and 250 mV GHz in millimeter bands 22 Move the WR PROT WR ENA jumper on the A2 Controller assembly to the WR PROT position ...

Page 482: ...ress PRESET and set the controls to the following settings Center frequency 300MHz Span 0 Hz 5 Connect a signal generator to A15J801 6 Set the signal generator to the following settings Frequency 310 7 MHz CW Power 28dBm 7 If a flat line is displayed within 2 dB of the reference level and the performance test passed troubleshoot microcircuits A7 A8 A9 A10 A12 and A13 8 If a flat line is displayed ...

Page 483: ...xers which require such bias The selected input is fed to the 2nd IF Amplifier This amplifier consists of four stages of gain and two stages of SAW filters for image frequency rejection The flatness compensation amplifier consists of two fixed gain stages and two stages of variable gain This provides an overall adjustable gain of 4 dB to 30 dB This gain is adjusted during a spectrum analyzer sweep...

Page 484: ...n the A2 controller assembly to the WR ENA position 8 While measuring the signal at the mixer 10 7 MHz IF output adjust the signal source until the level of the 10 7 MHz IF is 40 dBm 9 On the spectrum analyzer press SGL SWP CAL IF ADJ OFF MORE 1 OF 2 and FLATNESS Increase the gain of the flatness compensation amplifiers to maximum by entering 0 using the data keys This sets the gains in the flatne...

Page 485: ...ivers Refer to function block H on A15 RF Section Schematic Diagram in the 8560 E Series Spectrum Analyzer Component Level Information The control latches control the PIN Switch Drivers illustrated in Function Block I 1 Connect the positive lead of a DVM to A15J901 pin 15 HEXTMIX Connect the negative lead to A15J901 pin 6 The measured signal controls the switching between internal and external IF ...

Page 486: ... ID ON the SIG ID Oscillator turns on during alternate sweeps 1 Set the spectrum analyzer to the following settings Trigger singlesweep SIG ID on 2 Use an active probe with a second spectrum analyzer to measure the signal level at A15X602 3 On the spectrum analyzer press SGL SWP With each press of SGL SWP the analyzer alternates between the following two states State 1 A15J901 pin 13 LSID TTL low ...

Page 487: ...th the analyzer set to EXTernal frequency reference U304A output low forces the output of U304D to stay high This allows U304B to control the outputs of U303B U304C and U303D In INTernal frequency reference U304D controls the outputs of these three NAND gates and the output of U304B is held high Check the 10 MHz reference by performing the following steps 1 Set the spectrum analyzer 10 MHz referen...

Page 488: ... its voltage reference or the TTL level generator Check these areas as follows a On the spectrum analyzer press 10 MHz INT b Check U305 pin 3 for approximately 12 Vdc Option 103 only c Check with an oscilloscope for a 10 MHz sine wave greater than or equal to 1 V p p at J305 or at U302 pin 3 with Option 103 10 If the signal at U304 pin 13 is correct see Figure 12 10 on page 628 but there is a prob...

Page 489: ...628 Chapter12 RF Section A15 RF Assembly Figure 12 10 10 MHz TTL Reference at U304 Pin 13 ...

Page 490: ...AS LOMA Gate Bias Voltage HEXTMIXB External Mixer 12V EXT MIX 12V INT MIX HSIGIDOFFA SIG ID Oscillator ON 12V SIG ID OFF 8V SIG ID ON PIN SW PIN Diode Switch Control SBTX or RYTHM LO Band HI Band PIN DIODE SWITCH PIN Diode Switch Control For 2ND Conv IF Output MIXER BIAS Detected Voltage on 2ND Converter Mixer Diode RFGAIN Voltage to Control Gain of Flatness Comp Amps RFGAIN1 and RFGAIN2 Currents ...

Page 491: ......

Page 492: ...633 13 Display Power Supply Section ...

Page 493: ...troubleshooting the A6 power supply module When using an isolation transformer connect a jumper between A6TP101 and A6TP301 This connects the circuit common to earth ground Remove this jumper when the isolation transformer is voltages with lethal currents in all areas Use extreme care when servicing these assemblies Always disconnect the power cord from the instrument before servicing these assemb...

Page 494: ...he A18 LCD liquid crystal display and the A6 power supply The A6 power supply is explained in the power supply section which begins on page 590 Figure 13 1 on page 636 illustrates the LCD block diagram Troubleshooting the LCD Display page 637 Blank Display page 637 Dim Display page 639 Troubleshooting using the VGA port page 639 Troubleshooting using part substitution page 639 ...

Page 495: ...ors the control signals and determines when the Hitatchi 7707 processor writes to display memory When this occurs the FPGA makes a duplicate of this information on the display driver board The other main function of the FPGA is to provide the signals necessary to drive a TFT LCD display and a standard VGA monitor The processor reads display information received from the controller board creates a ...

Page 496: ...lank suspect the A2 controller a loose cable or the display driver 6 If the LED is not lit or the fan is not working or the probe power voltages are not correct or the power supply indicators on the edge of the A2 controller assembly are not working properly proceed to the section on troubleshooting the power supply on page 658 7 Open the left side of the instrument see Procedure 2 A1 Front Frame ...

Page 497: ...hat W60 W61 W62 W63 and W64 are tight Reconnect the power cord and check the instrument to see whether the problem is corrected If not proceed to step 2 2 Disconnect the power cord and turn the instrument off Replace W60 the ribbon cable that connects the A2 board to the display driver board Reconnect the power cord and check the display to see whether the problem is corrected If not proceed to st...

Page 498: ...gure 13 3 Location of 5V supply pins on J1 of A17 and J8 of A2 Figure 13 3 shows A2J8 connections on 8560 EC Series Instruments Lines 2 5 and 42 44 supply 5V to the two LCD backlights Lines 1 and 41 supply 5V to the A17A1 Inverter board Lines 1 6 and 41 44 are identical on A17J1 ...

Page 499: ...TP308 for 5 V 4 Check TP302 for 15 V 5 Check TP303 for 15 V 6 Check TP304 for 28 V 7 Check TP305 for 12 6 V 8 Measure the voltage at TP108 to verify the output of the input rectifier The voltage should be between 215 Vdc and 350 Vdc 9 If it is not within this range check the rear panel fuse input rectifier input filter and the rear panel line voltage selector switch 10 Measure the voltage at TP206...

Page 500: ...from TP108 If the line fuse still blows suspect CR102 through CR105 3 If the fuse is not burned out check A6TP108 for a voltage of between 215 V and 350 V 4 If the voltage at TP108 is correct disconnect the power cord Wait 60 seconds for the high voltage to discharge Remove and check A6Q102 5 If Q102 is shorted Q103 Q104 CR106 and CR108 are also probably shorted If Q102 is working properly measure...

Page 501: ...signal at TP206 goes low an overcurrent condition has been detected Suspect a short in the secondary output rectifier voltage regulators or another assembly Low Voltage Supplies 1 Connect the negative lead of a DVM to A6TP301 2 Check A6TP302 for 15 Vdc 3 Check A6TP303 for 15 Vdc 4 Check A6TP304 for 28 Vdc 5 Check A6TP305 for 12 6 Vdc 6 Check A6TP308 for 5 Vdc 7 If the voltages measured above are c...

Page 502: ...cuitry Thermal shutdown occurs when RT201 mounted on the main heatsink reaches a temperature of 100 C When this occurs the voltage at U203 pin 13 exceeds 0 6 V and inhibits pulses to the buck regulator R203 R204 U211 and associated circuitry provide feedforward for U203 This makes the loop gain independent of input line voltage and cancels 120 Hz ripple by more than 10 dB U202C and its associated ...

Page 503: ...hen the current through the FETs in the DC DC converter exceeds 1 8 A the voltage across R116 will cause the output of U202D to go high This sets a latch in U204 which turns off U203 Power Up See function block M of the A6 power supply schematic diagram in the component level information binder The power up circuitry generates the PWR UP signal which tells the microprocessor that the supplies are ...

Page 504: ......

Page 505: ...671 14 Component Level Information Packets ...

Page 506: ...4 Component Level Information Packets Introduction Introduction Component Level Information Packets CLIPs contain a parts list a component location diagram and schematic diagrams for selected instrument assemblies ...

Page 507: ......

Page 508: ...emoval and replacement 223 A9 input attenuator removal and replacement 224 abbreviations 264 access to internal assemblies 177 accessories 269 ADC troubleshooting 400 ADC interface section 360 addresses of sales and service offices 44 adjustment adjustable components table 51 93 factory selected components 96 related adjustments table 51 92 safety considerations 49 91 tools 50 92 adjustment proced...

Page 509: ...es 800 to 899 349 AMPC ram check 349 amplitude error message 582 344 automatic IF error messages 400 to 599 334 battery error message 718 348 cal unlock error message 499 339 digital and checksum errors 346 EEROM checksum error messages 700 to 704 346 elimination 327 fractional N PLL error message 337 331 LOMA leveling loop error messages 338 to 340 332 microprocessor error message 717 348 model o...

Page 510: ...section 360 interface strobe troubleshooting 409 internal assemblies access to 177 isolation amplifier problems 453 J jumper write protect enable 322 K keyboard problems 382 516 L LC filter adjustments 112 LCD EC assembly 180 LCD display 635 LCD simplified block diagram 636 LCD troubleshooting the 637 limiter phase adjustment 171 limiter problems 453 line generator 491 495 line switch E assembly 2...

Page 511: ...2 resolution bandwidth performance test failures 442 returning instruments for service 35 RF A15 assembly removal 231 RF A15 assembly replacement 232 RF assembly troubleshooting 621 RF block diagram 584 RF gain DACs 389 RF parts 279 RF section 353 RF section parts 291 rosenfell detector troubleshooting 399 RPG problems 382 RPG assembly 201 RYTHM 354 removal and replacement 227 S sales and service ...

Page 512: ... kickstarting 661 troubleshooting low voltage supplies 661 troubleshooting the LCD 637 U unlocked PLL 535 user generated error messages 350 V VCO 562 VCO bias voltages 565 VCXO troubleshooting 10 6925 MHz 451 video circuits troubleshooting 391 video filter troubleshooting 395 video functions 361 video gating problems 385 video MUX troubleshooting 394 454 video offset troubleshooting 447 voltage tu...

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