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14. External Mixer Bias Adjustment

14. External Mixer Bias Adjustment

Assembly Adjusted

Al5 RF Assembly

Related Performance Test

There is no related performance test for this adjustment procedure.

Description

A voltmeter is connected to the HP 8560A IF INPUT with the external mixer bias set to off.
The bias is adjusted for a 0 Vdc output.

A l 4

SPECTRUM

ANALYZER

D I G I T A L V O L T M E T E R

F R E Q U E N C Y

ADAPTER

A l 5 R F

PROP

1 6

Figure 2-17. External Mixer Bias Adjustment Setup

Equipment

DVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A

Adapters

Type BNC (f) to SMA (m) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1200
Type BNC (f) to dual banana plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1251-2816

Cables

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

Procedure

1. Set the HP 8560A (LINE) switch off and disconnect the ac power cord. Remove the analyzer

cover and connect the equipment as illustrated in Figure 2-17. Reconnect the power cord
and set the (LINE) switch on.

2. Set the HP 3456A controls as follows:

FUNCTION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DCVOLTS

R A N G E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O . l V
RESOLUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lOOmV

Adjustment Procedures 2-55

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Summary of Contents for 8560A

Page 1: ...Service Manual HP 8560A Spectrum Analyzer SERIAL NUMBERS Prefix 3207A and Above Eiia HEWLETT PACKARD HP Part No 08560 90081 Printed in USA August 1992 ...

Page 2: ...ard Company 1990 1992 All Rights Reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws 1212 Valley House Drive Rohnert Park CA 94928 4999 USA ...

Page 3: ...from another country HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument HP 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 im...

Page 4: ...iderations Warning Before this instrument is switched on make sure it has been properly grounded through the protective conductor of the ac power cable to a 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 Warning There are many...

Page 5: ... 8561B 8563A Operating and Programming iWanua1 n Provides you with a listing of all remote programming commands Options Option 915 HP 8560A Service Manual and HP 8560A 6lB 63A Spectrum Analyzer Component Level Information w The service manual provides information to service your analyzer to the assembly level not always immediately available for new products n The component level information binde...

Page 6: ...mponents Adjustment Tools Instrument Service Position Using the TAM Test Equipment Adjustment Indicator 1 High Voltage Power Supply Adjustment 2 Display Adjustment 3 IF Bandpass Adjustment 4 IF Amplitude Adjustments 5 DC Log Amplifier Adjustments 6 Sampling Oscillator Adjustment 7 YTO Adjustment 8 First LO Distribution Amplifier Adjustment 9 Tracking Generator Power Level Adjustments 10 Frequency ...

Page 7: ... Procedure 7 A6Al High Voltage Assembly 3 22 Procedure 8 A7 through Al3 Assemblies 3 25 A7 1st LO Distribution Amplifier 3 28 A8 Low Band Mixer 3 29 A9 Input Attenuator 3 30 A10 Tracking Generator Option 002 3 31 AllYTO 3 32 Al3 Second Converter 3 33 Procedure 9 Al4 and Al5 Assemblies 3 34 Procedure 10 Al7 CRT Driver 3 37 Procedure 11 Bl Fan 3 38 Procedure 12 BTl Battery 3 39 Procedure 13 Rear Fra...

Page 8: ...150 ADC Errors 200 to 299 LO and RF Hardware Firmware Failures 300 to 399 YTO Loop Errors 300 to 301 Roller PLL Errors 302 to 316 YTO Loop Errors 317 to 318 Roller Oscillator Errors 321 to 329 YTO Loop Errors 331 600 MHz Reference Loop 333 YTO Leveling Loop 334 Sampling Oscillator 335 Automatic IF Errors 400 to 599 System Errors 600 to 651 Digital and Checksum Errors 700 to 799 EEROM Checksum Erro...

Page 9: ...scillator assembly 6 40 A5 IF Assembly 6 40 ADC Interface Section 6 41 ADC 6 42 Log Expand Video Functions P O A3 6 42 Triggering 6 42 Controller Section 6 42 EEROM 6 43 Firmware Display ASM Display Power Supply Section A6 Power Supply Al7 CRT Display Driver 6 43 6 43 6 43 6 43 6 43 7 ADC Interface Section Troubleshooting Using the TAM Automatic Fault Isolation Keyboard RPG Problems Keyboard Inter...

Page 10: ...its Log Amplifier Linear Amplifiers Video Offset Video Output Frequency Counter Prescaler Conditioner AM FM Demodulator 4 8 kHz IF Filters 4 8 kHz and 10 7 MHz IF Filters 10 6952 MHz VCXO Input Switch LO Switch Synchronous Detector Limiter Isolation Amplifier Detector Mixer Log Offset Gain Compensation Log Offset Compensation Log Gain Compensation Video Mux A5 IF Section IF Signature Common IF Sig...

Page 11: ... Setup Troubleshooting Using the TAM General PLL Troubleshooting PLL Locked at Wrong Frequency Unlocked PLL Frequency Span Accuracy Problems Determining the First LO Span Confirming Span Problems YTO Main Coil Span Problems LO Spans 20 MHz YTO FM Coil Span Problems LO Spans 1 01 MHz to 20 MHz Roller Oscillator Span Problems LO Spans 51 MHz First LO Span Problems All Spans Unlocked YTO PLL Operatio...

Page 12: ...nsation Control Control Latches SIG ID Oscillator 10 MHz Reference A10 Tracking Generator Option 002 Block Diagram Description Tracking Oscillator Upconverter Pentupler Modulator Coupler Output Mixer Output Amplifier Bias Board Output Goes Unleveled ERR 900 or ERR 901 Excessive Residual FM Flatness Out of Tolerance Vernier Accuracy Out of Tolerance Harmonic Spurious Outputs Too High Power Sweep No...

Page 13: ...ead Power Supply Line Fuse Blowing Supply Restarting Every 1 5 Seconds Kick Start Low Voltage Supplies High Voltage Supplies CRT Supply Dropping Out Blanking Signal Buck Regulator Control DC DC Converter Control Power Up 12 4 12 5 12 6 12 7 12 8 12 9 12 11 12 11 12 13 12 13 12 13 12 14 12 15 12 15 12 16 12 16 12 17 A Component Level Information Packets Index Contents 8 ...

Page 14: ...tment Setup 2 18 External Mixer Amplitude Adjustment Setup 2 19 Location of A15Al 2 20 Signal ID Oscillator Adjustment Setup 2 21 600 MHz Amplitude Adjustment Setup 2 22 10 MHz Reference Adjustment Option 003 Setup and Adjustment Location 2 23 Tracking Oscillator Adjustment Setup 3 1 Hinged Assemblies 3 2 Discharging the Post Accelerator Cable 3 3 A9 A18 and Line Switch Assembly Mounting Screws 3 ...

Page 15: ...om View Al5 and Al4 Unfolded 5 7 Front End 5 8 Rear View 6 l Assembly Test Points 6 2 Ribbon Cable Connections 1 of 2 6 3 WR ENA Softkey Menu 6 4 Functional Sections 6 5 Phase Lock Loops 6 6 Simplified Block Diagram 6 7 HP 8560A Overall Block Diagram Sheet 1 of 3 6 7 HP 8560A Overall Block Diagram Sheet 2 of 3 6 7 HP 8560A Overall Block Diagram Sheet 3 of 3 7 l A3 Test Connectors 7 2 A3 Interface ...

Page 16: ... Locked at Wrong Frequency 10 5 Unlocked PLL 10 6 Input to YTO FM Coil Driver 10 7 Input to Main FM VCO Sweep Switch 10 8 Troubleshooting an Unlocked YTO PLL 10 9 Simplified Sweep Generator 10 10 Simplified Sweep Generator during Retrace 10 11 Simplified Synthesizer Section 10 12 Simplified Al4 Assembly Block Diagram 10 13 Simplified Al5 Assembly Block Diagram 10 14 Frequency Control Block Diagram...

Page 17: ...ers 1 of 4 4 2 Reference Designations Abbreviations and Multipliers 2 of 4 4 2 Reference Designations Abbreviations and Multipliers 3 of 4 4 2 Reference Designations Abbreviations and Multipliers 4 of 4 4 3 Manufacturers Code List 1 of 3 4 4 Replaceable Parts 6 l Location of Assembly Troubleshooting Text 7 l W2 Control Cable Connections 1 of 2 7 2 Automatic Fault Isolation References 7 3 TAM Tests...

Page 18: ...2 YTO Frequency Errors with A14J23 on Pins 2 and 3 10 13 Voltages in FM Coil and Main Loop Drivers 10 14 Main Coil Coarse and Fine DACs Voltages 10 15 Sampling Oscillator PLL Divide Ratios 11 1 Automatic Fault Isolation References 11 2 TAM Tests versus Test Connectors 11 3 Attenuator Pin Values 11 4 RF Section Mnemonic Table 12 1 Wl Power Cable Connections 1 of 2 12 1 Wl Power Cable Connections 2 ...

Page 19: ...trument properly after repair Chapter 3 Assembly Replacement contains instructions for removal and replacement of all major assemblies Chapter 4 Replaceable Parts contains the information necessary to order parts or assemblies for the instrument Chapter 5 Major Assembly and Cable Locations contains figures identifying all major assemblies and cables Chapter 6 General Troubleshooting contains instr...

Page 20: ...enhance their performance usability or reliability HP service personnel have access to complete records of design changes to each type of equipment based on the equipment s serial number Whenever you contact HP about your analyzer have the complete serial number available to ensure obtaining the most complete and accurate information possible The serial number label is attached to the rear of the ...

Page 21: ...10 Tracking Generator Al5 RF Assembly Front dress panel w14 W16 W36 W42 w43 W46 w 4 7 W48 Rear panel J 11 Front panel 53 Front panel J6 added unique part number unique part number added added deleted deleted added added added added added deleted added HP 8560A Option 012 001 002 Al5 RF Assembly unique part number w19 added Rear panel JlO added A10 Tracking Generator added Front dress panel unique ...

Page 22: ...ded HP 8560A Option 013 001 003 Al5 RF Assembly unique part number w19 added Rear panel JlO added A21 OCXO added w49 added w50 added HP 8560A Option 023 002 003 Al5 RF Assembly unique part number A10 Tracking Generator added Front dress panel unique part number w14 added W16 added W36 deleted W42 deleted w43 added W46 added w 4 7 added W48 added Rear panel Jll added Front panel 53 deleted 1 4 Gene...

Page 23: ...anel JlO A10 Tracking Generator Front dress panel w14 W16 W36 W42 w43 W46 w 4 7 W48 Rear panel Jll Front panel J3 Front panel J6 A21 OCXO w49 w50 unique part number added added added unique part number added added deleted deleted added added added added added deleted added added added added General Information l 5 ...

Page 24: ...Kit The HP 8560A Service Kit HP part number 08562 60021 contains service tools required to repair the instrument Refer to Table l l for a list of items in the service kit Table l l Service Kit Contents Description Quantity HP 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 Ca...

Page 25: ...d 1 MegOhm R e s i s t o r I TV hhirist StroD Figure 1 2 Example of a Static Safe Workstation Reducing Potential for ESD Damage The suggestions that follow may help reduce ESD damage that occurs during nstrument testing and servicing w Before connecting any coaxial cable to an analyzer connector for the first time each day momentarily ground the center and outer connectors of the cable n Personnel...

Page 26: ...leted a performance test record or have any other specific data on the performance of the analyzer please send a copy of this information with the unit Original Packaging Before shipping pack the unit in the original factory packaging materials if they are available If the original materials are unavailable identical packaging materials may be acquired through any Hewlett Packard Sales and Service...

Page 27: ...nt with at least 3 to 4 inches of packing material or enough to prevent the equipment from moving in the carton If packing foam is unavailable the best alternative is SD 240 Air CapTM from Sealed Air Corporation Commerce CA 90001 Air Cap looks like a plastic sheet covered with l 1 4 inch air filled bubbles Use the pink colored Air Cap to reduce static electricity Wrap the equipment several times i...

Page 28: ...K 1 1 2 6 Item Description 1 9211 5636 2 08590 80013 3 08590 80014 HP Part Number Outer Carton Pads 2 Bottom Tray Figure 1 3 HP 8560A Shipping Container and Cushioning Materials l 1 0 General Information ...

Page 29: ...rest Hewlett Packard Sales and Service Office listed in Table l 3 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 Ordering Information section in Chapter 4 Replaceable Parts for the phone number and more information Ge...

Page 30: ... Meadows IL 60008 708 255 9800 New Jersey Hewlett Packard Co 120 W Century Road Paramus NJ 07653 201 599 5000 Texas Hewlett Packard Co 930 E Campbell Rd Richardson TX 75081 214 231 6101 1 Avenue Du Canada Blackburn Victoria 3130 Zone D Activite De Courtaboeuf 61 3 895 2895 F 91947 Les Ulis Cedex France Canada 33 1 69 82 60 60 Hewlett Packard Canada Ltd 17500 South Service Road Germany Trans Canada...

Page 31: ...TTL Sync Output AM FM Frequency Range 1 MHz to 200 MHz HP 8640B A Signal Generator Frequency Modulation Mode Modulation Oscillator Frequency 1 kHz FM Peak Deviation 5 kHz Microwave Frequency Range 9 MHz to 6 9 GHz HP 5343A P A M V Frequency Counter Time base Accuracy Aging 5 x lo day of Option 001 External Frequency Reference Input Universal Modes TI AFB Frequency Count HP 5334A B P Counter Time I...

Page 32: ...e 100 kHz to 2 9 GHz HP 8482A PAT Maximum SWR M V 1 1 1 MHz to 2 0 GHz 1 30 2 0 GHz to 2 9 GHz 4mplifier Frequency Range 2 0 to 2 9 GHz HP 11975 P Minimum Output Power Leveled 2 0 to 8 0 GHz 16 dBm Output SWR Leveled 1 7 Digital Voltmeter Range 15 V dc to 120 V dc Accuracy fl mV on 10 V Range Input Impedance 21 Ma DVM Test Leads 236 inches alligator clips probe tips 10 dB Step Attenuation Range 30...

Page 33: ...HP 909D P M V 0955 0306 P M V 12 MHz Low Pass Filter Cutoff Frequency 12 MHz 0955 0518 P g element Tchebychev 0 1 dB ripple Rejection at 18 MHz 45 dB Directional Frequency Range 5 MHz to 50 MHz HP 8721A P Bridge Coupling 6 0 dB nominal Directivity 30 dB minimum VSWR 1 45 Power Splitter Frequency Range 1 kHz to 22 GHz HP 11667B P A M V Insertion Loss 6 dB nominal Output Tracking 0 25 dB Equivalent ...

Page 34: ...ge 10 kHz to 6 9 GHz 8120 4921 P A M V three required Maximum SWR 1 4 at 6 9 GHz Maximum Insertion Loss 2 dB Connectors APC 3 5 m both ends Length 2 91 cm 36 in Photometer No Substitute Tek JlG TV A Radiometer Controller Required to run Operation Verification Software HP 9816A V No substitute HP 9836A C or HP 310 Power Supply Output Voltage 224 V dc HP 6114A A Output Voltage Accuracy f0 2 V Tuning...

Page 35: ...djustment 2 12 2 Display Adjustment 2 14 3 IF Bandpass Adjustment 2 20 4 IF Amplitude Adjustments 2 25 5 DC Log Amplifier Adjustments 2 29 6 Sampling Oscillator Adjustment 2 33 7 YTO Adjustment 2 3 7 8 First LO Distribution Amplifier Adjustment 2 40 9 Tracking Generator Power Level Adjustments 2 42 10 Frequency Response Adjustment 2 45 11 Calibrator Amplitude Adjustment 2 48 12 10 MHz Reference Ad...

Page 36: ...ed even if the instrument has been disconnected from its source of supply Warning Use a nonmetallic adjustment tool whenever possible Which Adjustments Should Be Performed Table 2 1 lists the manual 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 Tes...

Page 37: ...10 1010 Never try to force an adjustment control This is especially critical when tuning variable capacitors or slug tuned inductors Required service accessories with part numbers are listed in Service Kit in Chapter 1 Instrument Service Position Refer to Chapter 3 for information on removing the analyzer cover assembly and accessing all internal assemblies Adjustment Procedures 2 3 ...

Page 38: ... Amplitude Adjustment High Voltage Power Supply Adjustment Display Adjustment High Voltage Power Supply Adjustment Display Adjustment First LO Distribution Amplifier Adjustment Frequency Response Adjustment or perform the Frequency Response performance test in the HP 8560A Installation and Verification Manual The adjustment must be performed if the performance test fails Frequency Response Adjustm...

Page 39: ...bution Amplifier Adjustment Frequency Response Adjustment 10 MHz Reference Adjustment TCXO Calibrator Amplitude Adjustment External Mixer Bias Adjustment Sampling Oscillator Adjustment Signal ID Oscillator Adjustment External Mixer Amplitude Adjustment Frequency Response Adjustment 600 MHz Amplitude Adjustment Second IF Gain Adjustment Sampling Oscillator Adjustment Display Adjustment Display Adju...

Page 40: ...t of a vector on the display Adjusts the vertical gain in fast analog zero span to match with the digital zero span input Adjusts the end of the trace to the rightmost vertical graticule line in fast analog zero span mode Adjusts the FM demodulation for a peak response Adjusts Limiter Phase for peak response Minimizes Log error near Top of Screen Minimizes Linearity Fidelity error Sets calibration...

Page 41: ...Generator Centers range of A10 Tracking Generator s tracking oscillator Adjusts the main coil tune driver current at a YTO frequency of 6 01 GHz near the upper YTO frequency limit Adjusts the FM span accuracy by affecting the sensitivity of the FM coil driver Adjusts the main coil fixed driver current at a YTO frequency of 3 2 GHz near the lower YTO frequency limit Adjusts the amplitude of the fir...

Page 42: ...n A17R77 Y POSN 2 Adjusts the CRT vertical position A17R90 TRACE ALIGN 2 Adjusts the display axis rotation A17R92 DDD 2 Adjusts focus of the center of the display 417R93 ASTIG 2 Adjusts for the spot roundness on the CRT display Table 2 3 Factory Selected Components Reference Adjustment Designator Number A5C204 A5C216 A5C326 A5C327 A5C505 A5C516 A5C717 A5C718 A15U802 Basis of Selection 3 Selected t...

Page 43: ...stitutes are listed in the Configuration Menu If you must substitute the source with a user defined model the adjustments run faster using a synthesized source rather than an unsynthesized source Note When connecting signals from the HP 8340A B or any microwave source to the adjustment setup use a high frequency test cable with minimum attenuation to 22 GHz HP part number 8120 4921 is recommended ...

Page 44: ...equency Response Adjustment 10 11 Calibrator Amplitude Calibrator Amplitude Adjustment 11 12 10 MHz Reference Oscillator 10 MHz Reference Adjustment TCXO 19 Option 003 13 External Mixer Bias External Mixer Bias Adjustment 14 External Mixer Amplitude External Mixer Amplitude Adjustment Adjustment excluded if the HP 8560A is an Option 002 14 15 Table 2 5 Required Test Equipment for TAM Adjustment 1 ...

Page 45: ...Hz 10 to 20 dBm 10 Low Band Flatness Source 10 MHz to 2 9 GHz HP 8340A B Power Meter HP 8902A HP 436A HP438A Power Sensor HP 8482A HP 8481A 10 MHz to 2 9 GHz Power Splitter HP 11667B 10 MHz to 2 9 GHz 11 Calibrator Amplitude Power Meter HP 8902A HP 436A HP 438A Power Sensor HP 8482A HP 8481A 12 10 MHz Reference Frequency Counter HP 5342A HP 5343A Oscillator 9 to 11 MHz 13 External Mixer Bias Manua...

Page 46: ...e Warning To minimize shock hazard use a nonmetallic adjustment tool when adjusting the A6 Power Supply Warning The following procedure probes voltages that if contacted could cause personal injury or death Note Adjustment of the high voltage power supply should not be a routine maintenance procedure Any adjustments should be done only if the A6 Power Supply A6Al HV Module or Al8 CRT display is re...

Page 47: ...y cover 2 Position the HP 8560A as shown in Figure 2 l Connect the positive DVM lead to A6TP405 and the negative DVM lead to A6TP401 3 Set the HP 3456A controls as follows FUNCTION DCVOLTS RANGE 1OOOVOLTS 4 Reconnect the power cord to the HP 8560A and set the switch on 5 Record the voltage marked on the A6Al HV Module Voltage marked on A6Al HV Module Vdc 6 Adjust A6R410 HV ADJ for a voltage equal ...

Page 48: ...justments use the graticule The fast zero span amplitude adjustments correct for differences between analog and digital display modes The displayed sweep time accuracy is adjusted in the fast zero span sweep adjustments SPECTRUM ANALYZER B N C C A B L E Figure 2 2 Display Adjustment Setup Equipment 10 dB VHF Step Attenuator HP 355D Photometer Radiometer TEK JlG TV Adapters Type N m to BNC f 1250 1...

Page 49: ...race A and the annunciators at the bottom of the display just disappears Deflection Adjustments 7 Press CRAT ON MORE 2 of 2 INTENSITY 80 STORE INTENSITY a MORE 1 of 2 and CRT ADJ PATTERN Fold up the A3 Interface assembly 8 Refer to Figure 2 3 for locating the lines used for adjusting DGTL X GAIN and DGTL Y GAIN Each of these lines is actually two lines adjusted for coincidence The two lines will f...

Page 50: ...softkey labels align with their appropriate softkeys 15 Press m If necessary readjust STOP BLANK and START BLANK for the best looking intersection of the graticule lines This will be most noticeable along the center vertical and horizontal graticule lines 2 16 Adjustment Procedures ...

Page 51: ...und dot possible D E F L E C T I O N A D J U S T M E N T S A d j u s t S T A R T B L A N K A d j u s t D G T L Y G A I N a n d S T O P B L A N K f o r u n t i l o n l y o n e s h a r p c o r n e r s line a p p e a r s A d j u s t D G T L X G A I N unti I o n l y o n e l i n e a p p e a r s hp 8 5 6 X jRECALLl SOFTKEY 1 SOFTKEY 2 SOFTKEY 3 SOFTKEY 4 SOFTKEY 5 EX I T A d j u s t T R A C E A L I G N ...

Page 52: ...cations 18 Adjust A17R34 COURSE FOCUS and A17R92 DDD for the best focus of the characters at the center of the screen 19 Adjust A17R21 Z FOCUS for the best focus of the test pattern s outside box 20 Adjust A17R26 X FOCUS for best focus of the characters at the corners of the test pattern 21 Repeat steps 17 through 20 to obtain the best overall focus quality 2 18 Adjustment Procedures ...

Page 53: ...l graticule line 30 Adjust A2R271 SWEEP GAIN to place the end of the trace at the tenth vertical graticule line one division from the right edge of the graticule 31 Press AMPLITUDE and press the up key seven times 32 Press SAVE SAVE STATE and STATE 2 33 Set the sweep time to 50 ms Press ISAVE SAVE STATE and STATE 3 34 Press m RECALL STATE and STATE 1 35 Switch between STATE1 and STATE2 Adjusting A...

Page 54: ...sor 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 assembly are made If the entire A5 IF assembly is replaced the assembly arrives pre adjusted from the factory and requi...

Page 55: ...C CTR 1 counterclockwise 6 Repeat steps 4 and 5 until the voltage reads t6 16 Vdc flO0 mV Note If the range for the LC CTR adjustment is insufficient replace the appropriate factory selected capacitor as listed in Table 2 6 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 ...

Page 56: ... 18 15 15 12 15 no change no change no change no change 8 2 10 6 8 8 2 6 8 8 2 Replace 15 with 18 18 no change no change 12 12 10 Indicates a condition that should not exist suspect broken hardware Replace 18 with no change no change 15 15 12 XTAL Bandpass Adjustments 13 On the HP 856OA press ii 1 m and ICAL 14 Move the positive DVM test lead to A5TP7 15 On the HP 8560A press ADJ CURR IF STATE Wai...

Page 57: ... the procedure in steps 15 through 17 22 Move the positive DVM test lead to A5TP4 23 Adjust A5T502 XTAL CTR 4 using the procedure in steps 15 through 17 Table 2 8 Factory Selected XTAL Filter Capacitors XTAL CTR Adjustment Fixed Factory Select Capacitor A5T200 XTAL CTR 1 A5C204 A5T202 XTAL CTR 2 A5C216 A5T500 XTAL CTR 3 A5C505 A5T502 XTAL CTR 4 A5C516 Table 2 9 XTAL Factory Selected Capacitor Sele...

Page 58: ...Table 2 10 Capacitor Part Numbers Capacitor Value pF HP Part Number 6 8 0160 4793 8 2 0160 4792 10 0160 4791 12 0160 4790 15 0160 4789 18 0160 4788 20 0160 5699 22 0160 4787 24 0160 5903 27 0160 4786 2 24 Adjustment Procedures ...

Page 59: ...y Adjusted A4 Log Amp Cal Oscillator A5 IF Assembly Related Performance Tests IF Gain Uncertainty Test Scale Fidelity Test Equipment Frequency Synthesizer HP 3335A Adapters Type N m to BNC f 1250 1476 Cables BNC 122cm 48in HP 10503A Test Cable 85680 60093 T E S T C A B L E _ I I SPECTRUM I A N A L Y Z E R FREQUENCY I I Figure 2 6 IF Amplitude Adjustment Setup Adjustment Procedures 2 25 ...

Page 60: ... 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 Amp Cal Oscillator When the adjustment sequence is complete the result of the adjustment should cause the 35 dBm signal at A5J5 to be displayed at 60 dBm This procedure also sets the attenuat...

Page 61: ...LITUDE 55dBm 6 Note the marker value Ideally it should read 60 dBm l dB 7 If the marker reads below 60 1 dBm rotate A4R826 CAL OSC AMPTD one third turn clockwise for every 0 1 dB below 60 dBm See Figure 2 7 for the location of A4R826 8 If the marker reads above 59 9 dBm rotate A4R826 CAL OSC AMPTD one third turn counter clockwise for every 0 1 dB above 60 dBm A change in the displayed amplitude wi...

Page 62: ...urns before continuing with the next step 20 On the HP 8560A press ADJ CXJRR IF STATE Note the AMKR amplitude reading 21 Set the HP 8560A reference level to 60 dBm and press INIKR and MARKERS OFF 22 Repeat steps 12 through 21 until the AMKR amplitude reading is 50 00 dB l dB A5 Adjustment Verification 23 On the HP 856OA disconnect W29 from A5J3 Connect the test cable between A5J3 and the 50 R outp...

Page 63: ...witching or Log Fidelity If multiple adjustments are required they should be done in the following order 1 Limiter Phase 2 Linear Fidelity 3 Log Fidelity All adjustments should be made with all of the shields on and only after allowing at least a 20 minute warm up Assembly Adjusted A4 Log Amplifier Related Performance Tests IF Gain Uncertainty Test Scale Fidelity Test Equipment Frequency Synthesiz...

Page 64: ...R445 for maximum on screen amplitude Refer to Figure 2 7 for the location of A4R445 A4 Linear Fidelity Adjustment This adjustment consists of adjusting A4R544 until the delta marker reads 40 dB under the following conditions Procedure 1 Set the HP 8560A LINE switch to off Remove the analyzer cover and place the analyzer in the service position as illustrated in Figure 2 6 See Figure 2 7 for adjust...

Page 65: ...even lower level and press LCAL ADJ CURR IF STATE Allow sufficient time for the analyzer to complete the adjustment 9 If the signal is higher on the screen than expected delta marker reads a change of less than 40 dB such as reads 39 dB then adjust A4R544 for an even higher level signal and press LCAL ADJ CURR IF STATE Allow sufficient time for the analyzer to complete the adjustment 10 Repeat the...

Page 66: ... input Set the HP 8560A LINE switch on 3 Press m ICAL IF ADJ OFF ADJ CURR IF STATE 4 Set the HP 8560A controls as follows CENTERFREQ 15MHz SPAN O RES BW 300 kHz REF LVL 1OdBm 5 Set up an HP 3335A as follows FREQUENCY 15MHz AMPLITUDE 1OdBm 6 Press MKR MARKER DELTA and decrease the source power to 26 dBm 7 Calcuate the error The error Delta Marker reading 16 in dB 8 Set the source power to 10 dBm 9 ...

Page 67: ... by 4 05 A coarse tune procedure is also included but should only be necessary when the coaxial resonator is replaced The power and match of the sampling oscillator signal to the A15A2 Sampler are also adjusted DIGITAL VOLTMETER SPECTRUM ANALYZER w PC BOARD PROP Figure 2 8 Sampler Adjustment Setup Equipment An asterisk indicates equipment used only for the coarse tune procedure Digital Voltmeter H...

Page 68: ...he positive DVM lead to A15J200 pin 13 Leave the negative DVM lead connected to A15J200 pin 6 7 Adjust A15C210 VCO RANGE for a DVM reading of t5 18 to 05 Vdc Note If A15C210 cannot be adjusted for 5 18 Vdc perform the coarse tune adjustment located at the end of this procedure Power and Sampler Match Adjustments 8 Connect the negative DVM test lead to A15J400 pin 6 and the positive DVM test lead t...

Page 69: ... 0 8 0 1 Vdc 17 Move the positive DVM test lead to A15J400 pin 3 18 Set the HP 8560A center frequency to 511 MHz 19 Readjust A15R237 SMPL PWR ADJ if necessary until the voltage at A15J400 pin 3 is 0 5 to 2 5 Vdc and the voltage at A15J400 pin 1 is 0 5 to i 2 5 Vdc 20 Disconnect the DVM probes from A15J400 Coarse Tune Adjustment Note This adjustment should be necessary only if the coaxial resonator...

Page 70: ... at the end of 2200 nearest X201 short the center conductor to a hole in the ground plane with the lead of a 1 MR resistor HP part number 0757 0059 until the frequency counter reads 298 MHz f4 MHz 28 Once the proper tap has been found solder the resistor lead to the ground plane and the center conductor of 2200 Cut away the rest of the resistor 29 Remove the power supply leads and the active probe...

Page 71: ... 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 FREQUENCY COUNTER SPECTRUM ANALYZER Al4 FREQ CONTRO A l 5 R F Figure 2 10 YTO Adjustment Setup Equipment Microwave Frequency Counter HP 5343A Option 001 Adapters Type N m to BNC f 1250 1476 Type N f to APC 3 5 f Option 026 only 1250 ...

Page 72: ... SPAN FREQUENCY CENTER FREQ 18 8893 GHz WSWP then press ISAVE SAVE LOCK OFF SAVE STATE STATE 0 Press m 35 7493 GHz SAVE SAVE STATE STATE 1 then press m RECALL STATE STATE 0 On the HP 5343A press SHIFT 7 and set the controls as follows SAMPLE RATE Fully Counterclockwise 10 Hz 500 MHz 506 MHz 26 5 GHz SWITCH 500 MHz 26 5 GHz Adjust A14R93 3 2 GHz for the appropriate frequency counter reading of 3 20...

Page 73: ...nts 13 On the HP 856OA press PRESET and set the controls as follows CENTER FREQ 300 MHz SPAN 20 MHz 14 Adjust A14R76 FM SPAN until the 300 MHz CAL OUTPUT SIGNAL is aligned with the center vertical graticule line Adjustment Procedures 2 39 ...

Page 74: ...ANALYZER DVM T E S T L E A D S SKI10 Figure 2 11 First LO Distribution Amplifier Adjustment Setup Equipment Measuring Receiver HP 8902A DVM HP 3456A Power Sensor HP 8485A DVMTest Leads HP 34118A Adapters Type N f to APC m 1250 1750 Procedure 1 Set the HP 8560A LINE switch off and disconnect the line cord Remove the cover and fold down the Al5 RF and Al4 Frequency Control assemblies Reconnect the l...

Page 75: ...wer sensor to the 1ST LO OUTPUT on the HP 8560A 9 On the HP 8560A press PRESET SPAN ZERO SPAN w 1 0893 GHz 10 Connect the positive DVM lead to A14J18 pin 13 11 Note the LO SENSE voltage printed on the A7 LODA label Adjust A14R621 LO AMPTD until the DVM reads 6 mV more negative than the LO SENSE voltage printed on the A7 LODA label For example if the LO SENSE voltage is 170 mV adjust A14R621 until ...

Page 76: ...J the offset adjustment to account for variations in cable loss from the tracking generator to the RF OUT 50 R connector This adjustment is done at a 0 dBm TRK GEN RF POWER setting This ensures that the absolute power level with a 0 dBm TRK GEN RF POWER setting is 0 dBm with little effect if any on the vernier accuracy In some cases the power level at the 10 dBm TRK GEN RF POWER setting might be o...

Page 77: ...ppear 6 Zero and calibrate the measuring receiver power sensor combination in log mode power levels readout in dBm Enter the power sensor s 300 MHz Cal Factor into the measuring receiver 7 Disconnect the Type N cable from the RF OUT 50R and connect the power sensor to the RF OUT 5Ofl 8 On the HP 8560A press m and mSWP MEASURING RECEIVER mj SPECTRUM ANALYZER POWER SENSOR 1 0 db A D J SJll 0 db ADJ ...

Page 78: ... for a 10 dBm l dB reading on the measuring receiver Refer to Figure 2 12 for adjustment location 13 Set the TRK GEN RF POWER to 0 dBm Adjust AlOR 0 dB ADJ for a 0 dBm f0 2 dB reading on the measuring receiver Refer to Figure 2 12 for adjustment location 14 Repeat steps 12 and 13 until the output power level is within the tolerances indicated at both the 10 dBm and 0 dBm TRK GEN RF POWER settings ...

Page 79: ...is applied to the spectrum analyzer at several different frequencies At each frequency the DAC controlling the flatness compensation amplifiers is adjusted to place the peak of the displayed signal at the same place on the screen The preselector is centered at each frequency before setting the DAC value The DAC values are stored in EEROM REF S J 1 2 Figure 2 13 Frequency Response Adjustment Setup ...

Page 80: ...P 8560A and set the controls as follows CENTERFREQ lO MHz SPAN OHz RES BW 300kHz dB DIV 2dB 5 Press NSTR PRESET on the HP 8340A B and set the controls as follows CW lO MHz POWERLEVEL 4 dBm 6 On the HP 8560A press IhnKR ICAL MORE 1 OF 2 SERVICE CAL DATA then FLATNESS The current value of the RF Gain DAC should be displayed in the active function area 7 Enter the appropriate Power Sensor Calibration...

Page 81: ...10 Frequency Response Adjustment 13 Place the WR PROT WR ENA jumper on the A2 Controller assembly in the WR PROT position Adjustment Procedures 2 47 ...

Page 82: ...rator Amplitude Adjustment Setup Equipment Measuring Receiver HP 8902A Power Sensor HP 8482A Adapters Type N f to BNC m 1250 1477 Procedure Note The HP 8560A should be allowed to warm up for at least 30 minutes before performing this adjustment 1 Place the HP 8560A in the service position shown in Figure 2 14 Prop the Al4 Frequency Control Board assembly in the service position 2 Zero and calibrat...

Page 83: ...or Amplitude Adjustment 3 Connect the HP 8482A through an adapter directly to the HP 8560A CAL OUTPUT connector 4 Adjust A15R561 CAL AMPTD for a 10 00 dBm reading on the HP 8902A display Adjustment Procedures 2 49 ...

Page 84: ...Hz as read by the frequency counter FREQUENCY COUNTER PC BOARD PROP Figure 2 15 10 MHz Frequency Reference Adjustment Setup Equipment Microwave Frequency Counter HP 5343A Option 001 Cables BNC 122cm 48in HP 10503A Procedure S K 1 1 4 Note Allow the HP 8560A to warm up for at least 30 minutes before performing this adjustment 1 Connect the equipment as shown in Figure 2 15 Prop up the Al4 Frequency...

Page 85: ... the TCXO is not operating and warmed up If the reference is set to 10 MHz EXT set the reference to 10 MHz INT and allow 30 minutes for the TCXO to warm up 4 Remove dust cap from A15U302 TCXO The dust cap is toward the rear of the HP 8560A 5 Adjust 10 MHz ADJ on A15U302 for a frequency counter reading of 300 000000 MHz f30 Hz 6 Replace the dustcap on A15U302 Adjustment Procedures 2 51 ...

Page 86: ...nal is applied to the INPUT 5Ofl The detected audio is monitored by an oscilloscope FM DEMOD is adjusted to peak the response displayed on the oscilloscope OSCILLOSCOPE wj SIGNAL GENERATOR I OUTPUT ADAPTER ADAPTER Figure 2 16 Demodulator Adjustment Setup Equipment AM FM Signal Generator HP 8640B Oscilloscope HP 1980A B Adapters Type N m to BNC f 2 required 1250 1476 S K 1 1 5 2 52 Adjustment Proce...

Page 87: ... MHz 4 Adjust the HP 8640B FM Deviation vernier for a full scale reading on the meter Set the FM to off 5 Set the HP 1980A B controls as follows CH 1 ON CH 2 OFF CH lVOLTS DIV 50mV TIMEBASE MAIN CHACOUPLING AC SECS DIV 1 00 ms DIV TRIGGER INT H F R E J O N T R I G G E R C O U P L I N G A C 6 On the HP 8560A press m and set the controls as follows CENTER FREQ lOO MHz SPAN 5 MHz REF LVL 10 dBm RES B...

Page 88: ...djusting A4C707 FM DEMOD for the loudest audio tone from the internal speaker This adjustment method may give broader and less accurate results than when using the oscilloscope to peak the response 11 Set the HP 8560A LuNE switch to off Disconnect the probe from A4R718 2 54 Adjustment Procedures ...

Page 89: ...METER F R E Q U E N C Y ADAPTER A l 5 R F kRD PROP SK1 1 6 Figure 2 17 External Mixer Bias Adjustment Setup Equipment DVM HP 3456A Adapters Type BNC f to SMA m 1250 1200 Type BNC f to dual banana plug _ 1251 2816 Cables BNC 122 cm 48in HP 10503A Procedure 1 Set the HP 8560A LINE switch off and disconnect the ac power cord Remove the analyzer cover and connect the equipment as illustrated in Figure...

Page 90: ...14 External Mixer Bias Adjustment 3 On the HP 8560A press m EXTERNAL MIXER BIAS then BIAS OFF 4 Adjust A15R926 EXT BIAS ZERO for a DVM reading of 0 000 Vdc 512 5 mV 2 56 Adjustment Procedures ...

Page 91: ...d 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 Only the determination of the Flatness Compensation Amplifier slope is performed if the HP 8560A has Option 002 SYNTHESIZED FREQUENCY BNC CABLE STANDARD SWEEPER EXT SPECTRUM POWER SENSOR IN OUT K117 Figure 2 18 Extern...

Page 92: ...TA 3RD IF AMP and CAL 3RD AMP GAIN Wait until the message ADJUSTMENT DONE appears in the active function block Note Perform the following steps only if the HP 8560A does not have Option 002 6 Press or to display the conversion loss value for each frequency listed in Table 2 12 Record any conversion loss reading not equal to 30 dB in Table 2 12 at the appropriate frequency 7 If all conversion loss ...

Page 93: ......

Page 94: ...equency Control assemblies Prop up the Al4 Frequency Control assembly 2 Remove the shield covering the third converter and A15Al Second IF Amplifier See Figure 2 19 3 Read the gain printed on the A15Al Second IF Amplifier label Select a value for A15U802 from Table 2 13 based upon the gain of the Second IF Amplifier 4 Reinstall the shield on the Al5 assembly 5 Perform the External Mixer Amplitude ...

Page 95: ...16 Second IF Gain Adjustment c c c 1 A15Al B E N E A T H 5 I E L D SK118 Figure 2 19 Location of AlSAl Adjustment Procedures 2 61 ...

Page 96: ...Amplifier U802 Value Gain Range dB dB 13 1 to 14 2 1 14 3 to 15 2 2 15 3 to 16 2 3 16 3 to 17 2 4 17 3 to 18 2 5 18 3 to 19 2 6 19 3 to 20 2 7 Second IFA Pad Part Number 0955 0308 0955 0309 0955 0310 0955 0311 0955 0312 0955 0313 0955 0314 2 62 Adjustment Procedures ...

Page 97: ...its range of adjustment The Signal ID Oscillator is then set to the frequency determined by the following equation Oscillator frequency 298 MHz Oscillator frequency range 4 FREQUENCY COUNTER SIGNAL ANALYZER ADAPTER Y 1 Al5 RF TEE TEST CABLE Al4 SPECTRUM ANALYZER FREOUENCY FREOUENCY A15J601 PC BOARD I PROP Figure 2 20 Signal ID Oscillator Adjustment Setup Equipment Microwave Frequency Counter HP 53...

Page 98: ...r the power on sequence is complete set the HP 8560A controls as follows CENTERFREQ 300MHz SPAN 0 Hz Press mCTRL INTERNAL MIXER SIG ID ON SGL SWP Press INSTR PRESET on the HP 8566A B and set the controls as follows CENTER FREQUENCY 10 7 MHz FREQUENCY SPAN 200 kHz Set the HP 5343A controls as follows SAMPLE RATE Fully Counterclockwise 50R 1MR SWITCH 500 10 Hz 500 MHz 500 MHz 26 5 GHz SWITCH 10 Hz 5...

Page 99: ...SIG ID for the lowest obtainable frequency with less than 3 dB decrease in amplitude from maximum Record the frequency counter reading as Fs dB LOW F3 dB L O W MHz 11 Calculate the difference between Fs dB HIGH and Fs dB LOW then divide results by four Enter the result as FOFFSET FOFFSET kHz 12 Add FOFFSET to Fs dB LOW recorded in step 10 and record the result as FSIGID FSIGID MHz 13 Adjust A15C62...

Page 100: ...CL divide by two chip Equipment Spectrum Analyzer HP 8566 Adapters Type N m to BNC f 1250 1476 Cables BNC 122 cm HP 10503A Procedure 1 Set the HP 8560A LINE switch off disconnect the power cord and remove the analyzer s cover Fold down the Al5 RF and Al4 Frequency Control assemblies Prop up the Al4 Frequency Control Assembly 2 Connect the equipment as shown in Figure 2 21 S I GNAL ANALYZER I Al5 R...

Page 101: ... HP 8566 and set the controls as follows START FREQ 10 MHz STOP FREQ 3lOMHz RES BW 3 MHz VIDEO BW lMHz REFERENCE LEVEL 10 dBm ATTEN OdB 5 While observing the HP 8566 display adjust A15R726 600 MHz AMPLITUDE to minimize the noise floor Adjustment Procedures 2 67 ...

Page 102: ... OCXO Stability is determined by the characteristics of the particular oscillator and the environmental and warmup conditions to which it has been recently exposed The spectrum analyzer must be on continuously for at least 24 hours immediately prior to oscillator adjustment to allow both the temperature and frequency of the oscillator to stabilize Equipment Frequency Counter HP 5334A B Frequency S...

Page 103: ... the automatic power on adjustment sequence is complete press PRESET to ensure that the frequency reference is set to internal b Allow the spectrum analyzer to remain powered on continuously for at least 24 hours to ensure that both the temperature and frequency of the A21 OCXO can stabilize c Connect the frequency standard to the frequency counter s rear panel TIMEBASE IN OUT connector as shown i...

Page 104: ...0 010 Hz 10 mHz Locate the FREQ ADJ control on the HP 8560A This control is accessible through the center deck of the spectrum analyzer See Figure 2 22 5 6 Remove the dust cap screw Use a nonconductive adjustment tool to adjust the FREQ ADJ control on the A21 OCXO for a frequency counter indication of 0 00 Hz 7 8 9 On the HP 5334A B Frequency Counter select a 10 second gate time by pressing GATE I...

Page 105: ...e limits These limits are tested in the Tracking Adjustment Range performance test This adjustment should only be performed if the Tracking Adjustment Range performance test has failed This adjustment recenters the tracking oscillator range The A10 Tracking Generator is partially removed from the spectrum analyzer to perform this adjustment A synthesized sweeper is used as the first local oscillat...

Page 106: ...P 8560A LINE switch on Press mCTRL TRACKING GENRATOR SRC PWR ON AUX REAR PANEL and 10 MHz EXT Allow the HP 8560A to warmup for at least five minutes Set the controls as follows CENTERFREQ 300MHz SPAN 0 Hz 4 Press INSTR PRESET on the synthesized sweeper and set the controls as follows CW 4 2107GHz POWERLEVEL 12dBm FREQUENCY STANDARD Switch rear panel EXT 5 Set the frequency counter controls as foll...

Page 107: ...ange the relationship between the COARSE TRACK ADJ dac number and the output frequency is nonlinear Adjust COARSE TRACK ADJ and FINE TRACK ADJ until the frequency counter reads Fcenter flO0 Hz Record the values of COARSE TRACK ADJ and FINE TRACK ADJ in Table 2 14 Adjust AlOC3 TRK OSC CTR until the frequency counter reads 300 MHz f500 Hz Repeat steps 7 through 14 at least once more until no further...

Page 108: ...cking Generator 3 3 1 All YTO 3 32 Al3 Second Converter 3 3 3 Procedure 9 Al4 and Al5 Assemblies 3 34 Procedure 10 Al7 CRT Driver 3 37 Procedure 11 Bl Fan 3 3 8 Procedure 12 BTl Battery 3 39 Procedure 13 Rear Frame Rear Dress Panel 3 40 Procedure 14 W3 Line Switch Cable 3 44 Procedure 15 EEROM A2U501 3 50 Procedure 16 A21 OCXO Option 003 3 51 Tools required to perform the procedures are listed in ...

Page 109: ... procedures by reference designation or name followed by a color code The code is identical to the resistor color code The first number indicates the base color with second and third numbers indicating any colored stripes For example W23 coax 93 indicates a white cable with an orange stripe Table 3 1 Required Tools Description 5 16 inch open end wrench 3 mm hex Allen wrench 4 mm hex Allen wrench N...

Page 110: ...tion When replacing the analyzer s cover use caution to avoid damaging any cables 3 4 When installing the cover assembly be sure to locate the cover s air vent holes on the bottom side of the 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 Torque each screw to 40 to 50 inch pounds to e...

Page 111: ...ltage probe under the A6AlW3 post accelarator cable s rubber shround to obtain a reading on the voltmeter See Figure 3 2 9 Keep the high voltage probe on the post accelerator connector until the voltage has dropped to a voltmeter reading of less than 5 mV less than 5 V at the connector This normally takes about 30 seconds 10 Disconnect the line power cord from the spectrum analyzer 11 Using a smal...

Page 112: ...ial at A6AlW3 is 9 kV Failure to discharge A6AlW3 correctly may result in severe electrical shock to personnel and damage to the instrument HIGH VOLTAGE PROBE A6AlW3 GROMMET A6A 1 W3 SK123 Figure 3 2 Discharging the Post Accelerator Cable Assembly Replacement 3 5 ...

Page 113: ... W41 18 For Option 002 analyzers use a 5 16 inch open end wrench to disconnect W47 from the front panel RF OUT 50R connector 19 Disconnect W42 from A7J3 and the front panel 1ST LO OUTPUT connector For Option 002 analyzers disconnect W46 from the front panel 1ST LO OUTPUT connector 20 Disconnect W36 coax 86 from the front panel IF INPUT connector 21 Remove the VOLUME knob and potentiometer from the...

Page 114: ...tch assembly 26 Remove the three screws 1 securing the front frame assembly to the analyzer s right side frame See Figure 3 4 1 3 P L A C E S q Figure 3 4 Front Frame Mounting Screws 27 Remove the three screws securing the front frame assembly to the analyzer s left side frame 28 Remove the four screws 1 F g 1 ure 3 3 securing the CRT clamps to the deck 29 Pull the cable tie 1 to free W9 See Figur...

Page 115: ... the glass with the silver coated edge towards the inside of the analyzer 1 Place the analyzer on its right side frame with the front end extending slightly over the front of the work bench 2 Gently place the A18 CRT assembly into the Al Front Frame assembly as llustrated in Figure 3 6 3 Place the front frame and CRT assemblies into the analyzer using caution to avoid pinching any cables 4 Dress t...

Page 116: ...T clamps to the deck 10 Place W9 between the CRT assembly and the A6 Power Supply assembly top shield so that the W9 wires are below the surface of the top shield 11 Connect W42 to A7J3 and the front panel 1ST LO OUTPUT connector For Option 002 analyzers connect W46 to the front panel 1ST LO OUTPUT connector 12 Use a 9 16 inch nut driver to reconnect CAL OUTPUT connector to the front panel 13 Conn...

Page 117: ...e line power switch ground lug with the screw The screw is captive 19 Fold up the Al4 and Al5 assemblies as described in Procedure 9 A14 and Al5 Assemblies Replacement steps 3 through 5 20 Place the analyzer top side up on the work bench and connect AlAlWl to A3J602 21 Snap post accelerator cable A6AlW3 to the A18 CRT assembly 22 Snap the black grommet protecting the A6AlW3 into the CRT shield 23 ...

Page 118: ...pad Note The front panel softkey actuators are part of the CRT bezel assembly and are not replaceable Should the softkeys become damaged replace the bezel assembly Replacement 1 Install the rubber keypad ensuring that the screw holes are visible through the pad 2 Place the AlAl Keyboard assembly over the rubber keypad Secure with nine panhead screws 3 Connect the RPG cable to AlAlJ2 and AlWl to Al...

Page 119: ... the RPG shaft to the front panel 4 Remove the RPG Replacement 1 Place the RPG into the front frame with the cable facing the bottom of the 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 AlAlJ2 4 Attach the RPG knob using a number 6 hex Allen wrench 5 Replace the A9 ...

Page 120: ...mblies 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 analyzer s right side frame with two hinges Fold both the A2 and A3 assemblies out of the analyzer as a unit 6 Fold both the A4 and A5 assemblies out of the analyzer as a unit 7 Remove th...

Page 121: ...e folded out position and attach ribbon cables Wl and W2 4 Attach all coaxial cables to the assembly as illustrated in Figure 3 9 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 3 9 6 Lay the A2 A3 A4 and A5 assemblies flat against each other in the folded out position Make sure that no cables ...

Page 122: ...COMPONENT SIDE COMPONENT BLACK W 5 4 RED w 5 3 BROWN W52 W H I T E W I A2 W 2 7 ORANGE A 4 w20 B L U E W 2 4 G R E E N w 5 4 RED w20 BLUE A19Wl w 5 3 BROWN VI2 w 5 1 G R A Y Y E L L O W Figure 3 8 Assembly Cables 1 of 2 SK130 Assembly Replacement 3 15 ...

Page 123: ...Procedure 5 A2 A3 A4 and A5 Assemblies W 5 2 w29 WH I TE V I O L E T W 2 7 ORANGE Figure 3 8 Assembly Cables 2 of 2 SK131 3 18 Assembly Replacement ...

Page 124: ...on the A6 power supply top shield 9 Fold the A2 and A3 assemblies together as a unit into the analyzer Be sure to fold HP IB cable A19Wl between the A3 and A4 assemblies using the two sets of hook and loop velcro fasteners 10 Fold ribbon cable AlAlWl 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 ...

Page 125: ...Procedure 5 A2 A3 A4 and A5 Assemblies AlAlWl A3 J602 P J P A19Wl SK133 Figure 3 10 HP IB and AlAl Wl Cable Placement 3 18 Assembly Replacement ...

Page 126: ...e that the analyzer s line power switch is in the off position 6 Connect a high voltage probe lOOO l such as the HP 34111A to a voltmeter with a 10 megohm input 7 Connect the clip lead of the probe ground to the chassis of the spectrum analyzer 8 Slip the tip of the high voltage probe under the A6AlW3 post accelarator cable s rubber shround to obtain a reading on the voltmeter See Figure 3 2 9 Kee...

Page 127: ...ack to A6JlOl See Figure 3 11 3 Secure the A6Al High Voltage assembly to the A6 Power Supply assembly using three panhead screws and washers Connect ribbon cable A6AlWl to A6J5 4 Snap post accelerator cable A6AlW3 to the CRT assembly AGAIWI A6Al FAN POWER L I NE POWER SK134 W I Figure 3 11 A6 Power Supply Connections 5 Ensure that all cables are safely routed and will not be damaged when securing ...

Page 128: ... Supply Assembly 7 Fold the A2 A3 A4 and A5 assemblies into the analyzer as described in Procedure 5 A2 A3 A4 and A5 Assemblies Replacement steps 6 through 12 Figure 3 12 Power Supply Cover SK135 Assembly Replacement 3 21 ...

Page 129: ...lOOO l such as the HP 34111A to a voltmeter with a 10 megohm input 7 Connect the clip lead of the probe ground to the chassis of the spectrum analyzer 8 Slip the tip of the high voltage probe under the A6AlW3 post accelarator cable s rubber shround to obtain a reading on the voltmeter See Figure 3 2 9 Keep the high voltage probe on the post accelerator connector until the voltage has dropped to a ...

Page 130: ... screws and washers Connect ribbon cable A6AlWl to A6J5 2 Snap post accelerator cable A6AlW3 to the CRT assembly 3 Place the black grommet protecting the post accelerator cable into the CRT shield 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 3 12 One ...

Page 131: ...re 7 A6Al High Voltage Assembly 10 Fold the A2 A3 A4 and A5 assemblies into the analyzer and secure the analyzer cover assembly as described in Procedure 5 A2 A3 A4 and A5 Assemblies 3 24 Assembly Replacement ...

Page 132: ...mblies n If the All YTO or A10 Tracking Generator Option 002 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 A7 First LO Distribution Amplifier A8 Low Band Mixer A9 Input Attenuator A10 Tracking Generator Option 002 All YTO Al3 Second Converter Figure 3 14 illustrates the location of the assemblies and Figure 3 15 provi...

Page 133: ...1 W 5 6 w 4 5 w 4 7 OPTION 0 0 2 F L 2 w 3 3 W 4 6 oPTIor I 0 0 2 w 4 3 OPT 10 0 0 2 w 5 7 A l 3 w 3 5 W I 0 WI6 A 1 0 O P T I O N 0 0 2 Figure 3 14 Assembly Locations I A l w 4 2 S T A N D A R D l A8 WI2 w 3 4 w 4 1 A 9 w 1 4 OPTION 0 0 2 SJ16 3 26 Assembly Replacement ...

Page 134: ...Procedure 8 A7 through Al3 Assemblies G A T E B I A W H I T E V I O L E T 9 7 G N D B L A C K Figure 3 15 RF Section Bias Connections 0 SJ17 Assembly Replacement 3 27 ...

Page 135: ...ssembly and disconnect W34 Replacement 1 Use a 5 16 inch wrench to attach W34 to A7J4 and W42 W43 on Option 002 to A7J3 2 Connect gate bias wire color code 97 to the A7 gate bias connection next to A7J2 3 Connect cable W12 to the A7 assembly 4 Place gate bias wire color code 97 beneath W38 and connect W38 to A7Jl Connect W42 W43 on Option 002 to the front panel 1ST LO OUTPUT connector Connect W39 ...

Page 136: ...3 4 Remove the two screws securing A8 to the center deck 5 Remove all semirigid coax cables from the A8 assembly Replacement 1 Place A8 on the center deck and attach all semirigid cables starting with A8J3 using caution to avoid damaging any of the cables center conductor pins 2 Use two panhead screws to secure A8 to the center deck Reconnect W45 to FL1 and A8 3 Tighten all semirigid coax connecti...

Page 137: ...ct the attenuator control ribbon cable to the A9 Input Attenuator 2 Place the A9 Input Attenuator into the analyzer with the A9 mounting brackets resting against the front frame center support and the right side frame Use caution to avoid damaging any cables 3 Attach the attenuator to the center support with one panhead screw 1 See Figure 3 15 4 Attach the attenuator to the right side frame using ...

Page 138: ...e Tracking Generator and disconnect W48 coax 80 CL 3 P L A C E S Q Replacement Figure 3 17 A10 Tracking Generator Mounting Screws 1 Connect W48 coax 80 to the Tracking Generator s INPUT connector 2 Orient the Tracking Generator so that its LO IN LO OUT and RF OUT connectors are closest to the Al3 Second Converter 3 Loosely connect the LO IN LO OUT and RF OUT semi rigid cables 4 Secure the Tracking...

Page 139: ...All mounting screws 1 shown in Figure 3 18 6 Disconnect WlO from All SJ19 Figure 3 18 A11 Mounting Screws Replacement 1 Reconnect WlO to All 2 Place the All Assembly in the analyzer 3 Secure the All Assembly to the right side frame using the four screws 1 removed in Removal step 5 4 Connect W38 to All 5 Install W56 FL2 W57 Ensure that all of the connections are tight 6 If the analyzer is an Option...

Page 140: ...om the Al3 assembly 3 Disconnect W33 coax 81 and W35 coax 92 from the Al3 assembly 4 Disconnect W57 from A13Jl 5 Remove the four screws securing Al3 to the main deck and remove the assembly Replacement 1 Secure Al3 to the analyzer s main deck using four panhead screws 2 Connect W57 to A13Jl Ensure that the connections on both ends of FL2 are tight 3 Connect W35 coax 92 to A13J2 310 7 MHz OUT jack ...

Page 141: ... on its right side frame 3 Remove the eight screws and washers holding the Al4 and Al5 assemblies to the bottom of the analyzer These screws are labeled 1 and 2 in Figure 3 19 A P 1 1 r SK143 Figure 3 19 Al4 and Al5 Assembly Removal Caution Washers are not captive Loose washers in instrument may cause internal damage 3 34 Assembly Replacement ...

Page 142: ...s 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 3 20 3 Lay the Al4 and Al5 assemblies flat against each other in the folded out position Make sure that no cables become pinched between the two assemblies Ensure that all coaxial cables...

Page 143: ...4 9 OPTION 0 0 3 w50 OPTION 0 0 3 w40 Ali Y W 3 7 w 5 1 W48 3 OPT 10 0 0 2 I WI4 w 3 7 WI 1 OPTION 0 0 2 W I W I 9 OPTION 0 0 1 w 3 5 W 3 6 DELETED I N O P T I O N 0 0 2 w29 A 3 4 A l 5 SJllO Figure 3 20 Al4 and Al5 Assembly Cables 3 36 Assembly Replacement ...

Page 144: ...securing Al7 assembly to the left side frame 5 Pull the Al7 Assembly out of the analyzer SK145 Figure 3 21 Al7 Mounting Screws Replacement 1 Connect W7 W8 W9 A6AlW2 and A18Wl to the Al7 CRT Driver Assembly Place the assembly into the center deck mounting slot next to the CRT assembly 2 Secure the Al7 assembly to the left side frame using two flathead screws Attach the board mounts to the left side...

Page 145: ... 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 passes through the instrument ...

Page 146: ...tage 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 9 Controller Section in this manual The battery should be replaced if its voltage is 2 6 V or less Removal Replacement 1 Locate the battery assembly cover on the analyzer s rear panel Use a screwdriver t...

Page 147: ...power cord to provide proper grounding while discharging the A6AlW3 post accelerator cable Make sure that the analyzer s line power switch is in the off position 7 Connect a high voltage probe lOOO l such as the HP 34111A to a voltmeter with a 10 megohm input 8 Connect the clip lead of the probe ground to the chassis of the spectrum analyzer 9 Slip the tip of the high voltage probe under the A6AlW...

Page 148: ...ck See Figure 3 22 21 Remove the six screws securing the rear frame to the left and right side frames 22 Use a 3 8 inch nut driver to remove the nut securing the earphone jack Carefully remove the jack using caution to avoid losing the lock washer located on the inside of the rear frame assembly Replace the washer and nut onto the jack for safekeeping 23 Remove the rear frame assembly 24 To remove...

Page 149: ...nch 10 Pull the red and black battery wires through the rear frame s battery assembly hole Solder the red wire to the battery assembly s positive lug and the black wire to the negative lug Replace the battery 11 Secure the battery assembly to the rear frame using two flathead screws 12 Reconnect the two cable ties on the A19 HP IB assembly to hold ribbon cable W7 to the A19 assembly 13 Connect the...

Page 150: ... ...

Page 151: ... 34111A to a voltmeter with a 10 megohm input 7 Connect the clip lead of the probe ground to the chassis of the spectrum analyzer 8 Slip the tip of the high voltage probe under the A6AlW3 post accelarator cable s rubber shround to obtain a reading on the voltmeter See Figure 3 2 9 Keep the high voltage probe on the post accelerator connector until the voltage has dropped to a voltmeter reading of ...

Page 152: ...front frame The screw is captive See Figure 3 25 A6Al w9 0 0 0 0 0 0 0 0 0 0 11 I Figure 3 24 W3 Dress and Connection to A6 Power Supply 20 Remove AlWl and AlWlDSl from the line switch assembly Let each hang freely Note If contact removal tool HP part number 8710 1791 is available complete assembly removal by performing Removal steps 21 and 22 If not skip to Removal step 23 w 3 SK 149 Assembly Rep...

Page 153: ...y as described in Procedure 2 Al Front Frame Al8 CRT Removal steps 16 through 29 24 Remove the left side frame from the analyzer using the hardware listed below The side frame will still be attached by the speaker wires Do not let it hang freely Screw Quantity 1 SCREW MACH M4 X 0 7 8 mm LG FLAT HD 3 2 SCREW MACH M3 X 0 5 35 mm LG FLAT HD 2 3 SCREW MACHM3X0 56mm LGFLATHD 6 25 Remove the line switch...

Page 154: ...T I O N O F T I E W R A P K N U C K L E W I R E 9 8 W I R E 9 2 8 W I R E 8 W I R E 9 1 8 PLIJNGER P U S H E S C O N T A C T O U T C O N N E C T O R B O D Y C O N T A C T R E M O V A L T O O L W I R E SK151 Figure 3 26 W3 Cable Connector Assembly Replacement 3 47 ...

Page 155: ...e deck 11 Connect AlAlWl to A3J602 12 Secure the power supply cover shield to the power supply using three flathead screws One end of the cover fits into a slot provided in the rear frame assembly 13 Redress W3 and the other cable assemblies down between the CRT assembly and the power supply cover such that the W9 wires are below the surface of the power supply cover 14 Fold up the A2 A3 A4 and A5...

Page 156: ...ed in the rear frame assembly 11 Place W3 and the other cable assemblies between the CRT assembly and the power supply cover so the W9 wires are below the surface of the power supply cover 12 Fold up the A2 A3 A4 and A5 assemblies into the analyzer as described in Procedure 5 A2 A3 A4 and A5 Assemblies Replacement steps 5 through 10 13 Fold up Al4 and Al5 assemblies as described in Procedure 9 Al4...

Page 157: ...tents of the program RAM into the new EEROM Turn the HP 8561B s LINE switch off then on cycling the analyzer power Allow the power on sequence to finish If error message 701 702 or 703 is displayed press cm MORE and RECALL ERRORS Use the STEP keys to view any other errors If error message 701 or 703 is displayed perform Adjustment 9 Frequency Response Adjustment in Chapter 2 If a TAM is available ...

Page 158: ...e the three screws 1 securing the OCXO to the main deck See Figure 3 28 5 Disconnect W49 coax 82 and W50 from the OCXO and remove the OCXO from the analyzer Figure 3 28 A21 OCXO Mounting Screws Replacement 1 Connect W49 coax 82 and W50 to the OCXO and position the OCXO in the analyzer 2 Secure the OCXO to the analyzer s main deck using three screws 1 See Figure 3 28 3 Fold the Al4 and Al5 assembli...

Page 159: ...timely processing of your order 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 Hewlett Packard office Direct Mail Order System Within the USA Hewlett Packard can supply parts through a direct mail order system Advantages of using the syst...

Page 160: ...special handling The toll free phone number 800 227 8164 is available 6 am to 5 pm Pacific standard time Monday through Friday and 916 785 BHOT for after hours weekends and holidays Hotline orders are normally delivered the following business day Parts List Format The following information is listed for each part 1 The Hewlett Packard part number 2 The part number check digit CD 3 The total quanti...

Page 161: ...ted Circuit Microcircuit Electron Tube Breakdown Diode Zener Voltage Regulator Cable Wire Jumper Socket Crystal Unit Piezoelectric Quartz Tuned Cavity Tuned Circuit A A Across Flats Acrylic Air Dry Method Ampere ADJ Adjust Adjustment ANSI American National Standards Institute formerly USASI ASA ASSY Assembly AWG American Wire Gage B BCD Binary Coded Decimal BD Board Bundle BE CU Beryllium Copper B...

Page 162: ...ncy Feet Foot F X D F i x e d G GEN General Generator GND Ground GP General Purpose Group II H Henry High HDW Hardware HEX Hexadecimal Hexagon Hexagonal HLCL Helical HP Hewlett Packard Company High Pass I IC Collector Current Integrated Circuit ID Identification Inside Diameter IF Forward Current Intermediate Frequency IN Inch 1NCL Including NT Integral Intensity Internal J I FET Junction Field Ef...

Page 163: ... POZI Pozidriv Recess PREC Precision PRP Purple Purpose PSTN Piston PT Part Point Pulse Time PW Pulse Width Q Figure of Merit R R REF RES 3F 2GD IND 2R 2VT Range Red Resistance Resistor Right Ring Reference Resistance Resistor Radio Frequency Rigid Round Rear Rivet Riveted s AWR Surface Acoustic Wave Resonator EG Segment GL Single 11 Silicon Square Inch L Slide Slow LT Slot Slotted SMA Subminiatur...

Page 164: ...oratories Inc White Wide Width UNHDND Unhardened W SW With Switch ZNR Zener W W Wire Wound V X V Variable Violet Volt Voltage X By Used with VAC Vacuum Volts Dimensions Alternating Current Reactance MULTI Abbreviation Prefix Multiple T tera lo G giga 109 M mega lo6 k kilo lo3 da deka 10 d deci 10 l C centi 1o 2 LIERS Abbreviation Prefix Multiple m milli 10 s P micro lo 6 n nano 10 9 P pica 10 12 f...

Page 165: ...AN DIEGO CA 32113 COILCRAFT INC CARY IL 02114 FERROXCUBE CORP SAUGERTIES NY US 02768 ITW FASTEX DES PLAINES IL 04222 AVX CORP GREAT NECK NY US 04713 MOTOROLA INC ROSELLE IL us 05791 LYN TRON INC BURBANK CA 05972 LOCTITE CORP NEWINGTON CT 06001 MEPCO ELECTRA INC MORRISTOWN NJ US 16132 COMPUTER TERMINAL CORP S A N A N T O N I O T X 06156 BAUM W A CO INC COPIAGUE NY 06341 PRODUCTS TECHNIQUES INC L O ...

Page 166: ...NTERSIL INC BOURNS INC COLORADO CRYSTAL CORP TELE TECH CORP ADVANCED MICRO DEVICES INC HARRIS CORP INTEL CORP FAIR RITE PRODUCTS CORP 3VERLAND PRODUCTS CORP MIDWEST COMPONENTS EXAR INTEGRATED SYSTEMS INC STETTNER CO SNAP ON TOOLS CORP 2ETTIG ENGRG MFG CO INC BERGWUIST CO SAMTEC VICHICON AMERICA CORP PRAGUE ELECTRIC CO Address BROOKLYN NY US S A D D L E B R O O K N J MOUNTAIN VIEW CA BURLINGTON MA ...

Page 167: ...HA WIRE CORP AMERICAN OIL SUPPLY CO HARDMAN INC INTL ELECTRONIC RESEARCH CORP SEALECTRO CORP AMER PRCN IND INC DELEVAN DIV CHASSIS TRAK DIV GENERAL DEVICES CO GRAHAM MAGNETICS INC STUART RADIATOR CO M A COM INC COOPER INDUSTRIES INC TELEDYNE INC SPECIALTY CONNECTOR CO Address PAOLI PA US HARTFORD CT CLIFTON NJ MIDLAND MI BEDFORD MA FULLERTON CA US ST PAUL MN US C L E V E L A N D O H YONKERS NY CON...

Page 168: ...HFT EXT SCREW MACH M3 x 0 5 GMM LG PAN HD SCREW MACH M3 5 x 0 6 GMM LG PAN HD SCREW MACH M3 5 x 0 6 GMM LG SCREW MACH M5 x 0 8 12 MM LG PAN HD SCREW METRIC SPECIALTY M4 x 0 7 THD 7MM MOUNT FLANGE SCREW MACH M4 x 0 7 lOMM LG PAN HD WRENCH HEX KEY ASSEMBLY INSTRUCTIONS OPTION 909 RACK KIT WITH FLANGES AND HANDLES Includes Parts Listed Below PANEL DRESS PANEL SUB SUPPORT REAR FRAME FRONT FRAME REAR C...

Page 169: ... 28480 0515 1241 28480 0515 1331 28480 5061 9501 28480 5061 9685 28480 0515 1106 55719 AWML4 28480 5958 6573 RACK SLIDE KIT 1 SLIDE CHAS 25 IN LG 21 84 IN TRVL 01561 C858 2 Includes Parts Listed Below Slides Cannot be Ordered Separately 4 SCREW MACH M5 x 0 8 14MM LG PAN HD 28480 3515 0949 9 SCREW MACH M4 x 0 7 12MM LG 28480 3515 1013 4 SCREW MACH M4 x 0 7 12MM LG PAN HD 28480 3515 0909 8 NUT CHANN...

Page 170: ...28480 5086 7744 5086 6744 8 REBUILT A7 EXCHANGE REQUIRED 28480 5086 6744 A8 5086 7748 4 1 LOW BAND MIXER 28480 5086 7748 5086 6748 2 REBUILT LOW BAND MIXER 28480 5086 6748 A9 5086 7822 5 1 PORT ATTEN 22 GHz 28480 5086 7822 5086 6822 3 REBUILT A9 EXCHANGE REQUIRED 28480 5086 6822 A10 5086 7799 5 1 TRACKING GENERATOR 28480 5086 7799 Opt 002 5086 6799 3 REBUILT AlO EXCHANGE REQUIRED 28480 5086 6799 A...

Page 171: ... RF ASSEMBLY RF ASSEMBLY RF ASSEMBLY RF ASSEMBLY RF ASSEMBLY SECOND IF AMP SAMPLER CAL OSCILLATOR ASSEMBLY CRT DRIVER ASSEMBLY CRT ASSEMBLY Order by Individual Parts CRT WIRING ASSEM Includes Shield A18L1 and A18Wl SPACER CRT TUBE CRT 6 7 IN CABLE ASSEMBLY TWO WIRE TRACE ALIGN P O A18MP1 A17J5 to A18Ll HP IB ASSEMBLY SABLE ASSEMBLY RIBBON HP IB IA2J5 to Rear Panel J2 BATTERY ASSY Includes W6 BTl X...

Page 172: ...IN SQ Part of W5 CHASSIS MECHANICAL PARTS See Figures 4 l through 4 6 for a complete listing of mechanical chassis parts ASSEMBLY SHIELDS PEAK DETECTOR TOP 28480 5021 6723 PEAK DETECTOR BOTTOM 28480 5021 6723 SCREW M2 5 14L 28480 0515 2080 SCREW M2 5 9 5L 28480 0515 1486 j RING 070ID 28480 0905 0375 WSHR LK M2 5ID 28480 2190 0583 Reference Designation Bl BTl HP Part Number 5061 9036 1420 0341 Fl 2...

Page 173: ... 5 14L WSHR LK M2 5ID O RING 070ID IF 1 TOP IF 1 BOTTOM IF 2 TOP IF 2 BOTTOM SCREW 5MM 2 5 16 PNPDS D RING 070ID WSHR LK M2 5ID RLR OSC TOP RLR OSC BOTTOM SCREW 5MM 2 5 16 PNPDS I RING 070ID WSHR LK M2 5ID REF TOP REF BOTTOM SYNTHZR TOP SYNTHZR BOTTOM jIGPATH TOP jIGPATH BOTTOM BRACE RF BD SCREW SCREW 5MM 2 5 16 PNPDS RING 070ID vliSHR LK M2 5 ID Mfi Mfr Part Code Number 2848C 2848C 2848C 2848C 28...

Page 174: ... to A7 Part of Cable Assembly Microcircuit 08562 60045 CABLE ASSEMBLY RIBBON Al3 2ND CONV DRIVE A14J12 to A13 Part of Cable Assembly Microcircuit 08562 60045 CABLE ASSEMBLY RIBBON A10 CONTROL SIGNAL A14J13 to AlO NOT ASSIGNED Reference HP Part c Designation Number D Wl 5061 9024 1 w 2 5061 9025 2 w 3 5062 0 728 6 w 4 5061 9033 2 W5 5062 4838 W6 5062 7755 w 7 5061 9034 W8 5061 9030 w9 WlO Wll w12 w...

Page 175: ...J5 to A4J3 CABLE ASSEMBLY COAX 7 10 7 IF A15J601 to A5J3 CABLE ASSEMBLY COAX 8 REF IN OUT A15J301 to Rear Panel 59 CABLE ASSEMBLY COAX 87 SAMPLER IF A15JlOl to A14JlOl CABLE ASSEMBLY COAX 81 2ND LO DRIVE A15J701 to A13J4 CABLE ASSEMBLY COAX 0 lST LO SAMP A7J4 to Al5A2Jl Reference Designation W16 Opt 002 W18 iv19 Opt 001 w20 w22 W23 W24 W25 W27 w29 w31 W32 w33 w34 HP Part Number 08560 60001 5062 07...

Page 176: ...0 to Front Panel 54 CABLE ASSEMBLY SEMI RIGID A10 RF OUT A10 to Front Panel J6 CABLE ASSEMBLY COAX 80 A10 600 MHz A155702 to AlO ZABLE ASSEMBLY COAX 82 A21 OCXO A21 to A155305 ZABLE ASSEMBLY OCXO DRIVE A21 to A15J306 Reference Designation w35 W36 w37 W38 w39 w40 w41 W42 w43 Opt 002 w44 w45 W46 Opt 002 w47 Opt 002 W48 Opt 002 v49 Opt 003 v50 Opt 003 HP Part Number 5062 0710 5062 0725 5062 0707 0856...

Page 177: ...EMBLY COAX 9 10 7 MHz CAL SIG A5J4 to A4J8 CABLE ASSEMBLY COAX 1 FREQ COUNTER A2J7 to A4J5 CABLE ASSEMBLY COAX 2 VIDEO A3JlOl to A4J4 CABLE ASSEMBLY AUDIO A4J6 to LSI Jl and Rear Panel 53 CABLE ASSEMBLY SEMI RIGID A8J2 to FL2 Serial Prefix 3031A and Above CABLE ASSEMBLY SEMI RIGID FL2 to A13J1 Serial Prefix 3031A and Above MG Mfr Part Code Number 28480 5062 6478 28480 5062 6477 28480 5062 6476 284...

Page 178: ...4 20 Replaceable Parts ...

Page 179: ...MM LG PAN HD SCREW MACH M3 x 0 5 GOMM LG PAN HD SCREW MACH M3 x 0 5 lOOMM LG PAN HD WASHER FL MTLC NO 4 125 IN ID SCREW MACH M3 x 0 5 GMM LG PAN HD Figure 4 1 Parts Identification Assembly Mounting Mfi Code 28480 28480 28480 28480 28480 Replaceable Parts 4 2 1 ...

Page 180: ...4 22 Replaceable Parts ...

Page 181: ...NG GEAR SOCKET GEAR HANDLE PLATE BACKUP PLATE SCREW MACH M4 X 0 7 BMM LG SODEG FLH HD SCREW MACH M5 X 0 8 16MM LG COVER MOISTURE DEFLECTOR LF MOISTURE DEFLECTOR RT SIDE TRIM SCREW MACH M4 X 0 7 lOMM LG PAN HD REAR FOOT O RING 145 lN XSECT DIA SIL WASHER LK HLCL 5 0 MM 5 1 MM ID SCREW SKT HD CAP M5 X 0 8 40MM LG INSULATOR 292 X 355 MM 51 THK Mfi Mfr Part Code Number 28480 5041 8911 28480 5041 8912 ...

Page 182: ...4 24 Replaceable Parts ...

Page 183: ...8L1 A18Wl SPACER CRT TUBE CRT P O A18MPl Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 A18MPl A18MP2 A18Vl A18Wl HP Part c Number D 0515 1079 3 5180 9023 2 0515 1826 0 3050 0891 7 5063 0249 7 0515 1590 8 5041 7246 3 0515 1079 3 5041 8961 1 5021 5486 7 5001 5870 1 3050 0891 7 0515 1079 3 5001 8705 7 5001 5872 3 0515 1367 7 0515 1461 9 5021 7464 5 0515 1367 7 051...

Page 184: ...4 26 Replaceable Parts ...

Page 185: ...M3 X 0 5 GMM LG SEM FLHD NOT ASSIGNED SCREW MACH M3 X 0 5 GMM LG SEM FLHD SCREW MACH M3 X 0 5 GMM LG SODEG FLH HD NOT SHOWN IN FIGURE 4 4 Item 1 2 3 4 5 6 7 8 9 10 11 Opt 002 12 13 14 15 16 17 18 19 20 21 22 Option 003 HP Part Number 0515 0886 0515 0886 0515 0886 5021 6749 0515 0886 3 5001 8705 7 0515 0890 9 5001 8755 7 0515 0890 9 2360 0507 8 2360 0183 6 0515 0866 9 0515 1146 0 5001 8731 9 18560 ...

Page 186: ...4 28 Replaceable Parts ...

Page 187: ...G 126TD CATCHLATCH MG Code 2848C 2848C 2848C 2848C 0515 1622 5041 8906 1000 0897 0370 3069 BY DESCRIPTION BY DESCRIPTION SCREW MACH M2 5 X 0 45 GMM LG PAN HD TX FRONT FRAME RF1 ROUND STRIP STL MSH SIL RBR CU SN NVTM W LKWR M4 WASHER LK INTL T 3 8 IN 377 IN ID NUT HEX DBL CHAM 3 8 32 THD 094 IN THK RF INPUT ASSEMBLY SCREW MACH M3 X 0 5 8MM LG PAN HD TX RUBBER KEYPAD INCLUDES KEYCAPS LED LAMP LUM IN...

Page 188: ...4 30 Replaceable Parts ...

Page 189: ... HD FOR 0 312 D HOLE STL 04213 D 2730 LC2 1 ADAPTOR COAX STR F SMA 28480 1250 1753 INCLUDES WASHER AND NUT 4 SCREW MACH M3 X 0 5 GMM LG SODEG FLH HD 28480 0515 0890 1 SCREW MACH M3 X 0 5 GMM LG PAN HD 28480 0515 0898 5 NUT SPCLY 15 32 32 THD l IN THK 562 WD 00000 BY DESCRIPTION 1 CONNECTOR TEL P CKT 141 SHK DIA 28480 1252 0995 INCLUDES NUT AND JACK 1 REAR PANEL DRESS 28480 5001 8719 4 SCREW MACH M...

Page 190: ...4 32 Replaceable Parts ...

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Page 196: ...t End 5 9 Figure 5 8 Rear View 5 10 Use the list below to determine the figure s illustrating the desired assembly or cable Assemblies Figure Al Front Frame 5 6 AlAl Keyboard 5 6 A2 Controller 5 1 5 2 A3 Interface 5 1 5 2 A4 Log Amplifier Cal Oscillator 5 1 5 3 A5 IF Filter 5 1 5 4 A6 Power Supply 5 4 A6Al High Voltage Module 5 4 A7 LO Distribution Amplifier 5 7 A8 Low Band Mixer 5 7 A9 RF Attenua...

Page 197: ... WlO YTO Drive Cable 5 6 5 7 Wll Attenuator Drive Cable 5 6 W12 A7 LODA Drive Cable 5 6 5 7 W13 Al3 Second Conv Drive Cable 5 6 W14 A10 Control Signal Cable Opt 002 5 6 5 7 W15 Not Assigned W16 A10 ALC EXT Cable Opt 002 5 6 5 7 W17 NOT ASSIGNED W18 LO Sweep Coax 97 5 6 W19 Second IF Out Coax 83 Option 001 5 5 W20 Zero Span Video Coax 6 5 2 W21 NOT ASSIGNED W22 10 MHz Freq Count Coax 0 5 2 5 5 W23 ...

Page 198: ...Out Standard 5 7 W43 A10 LO IN Opt 002 5 7 W44 Semirigid 5 7 W45 Semirigid 5 7 W46 A10 LO OUT Opt 002 5 7 W47 A10 RF OUT Opt 002 5 7 W48 A10 600 MHz Coax 80 Opt 002 5 5 W49 A21 OCXO Coax 82 Option 003 5 5 W50 A21 OCXO Drive Option 003 5 5 W51 10 MHz IN Coax 84 5 3 5 5 W52 CAL Oscillator Out Coax 9 5 4 W53 Frequency Counter Coax 1 5 2 5 3 W54 Video Coax 2 5 2 5 3 W55 Audio Out 5 3 5 4 W56 Semirigid...

Page 199: ...I W 2 5 W 2 3 A3Wl W 6 nnnu noon 0000 0000 noon n o o n A 3 Figure 5 l Hinged Assemblies w20 COMPONENT W 2 4 W 2 w20 A19Wl w53 Wl A 2 Figure 5 2 Top View A2 Unfolded SK155 SK156 5 4 Major Assembly and Cable Locations ...

Page 200: ...w 5 4 A 4 w 5 5 W 2 7 Figure 5 3 Top View A2 and A3 Unfolded SK157 Major Assembly and Cable Locations 5 5 ...

Page 201: ... 5 W 2 7 A19Wl A 1 9 w 3 W8 w 4 w9 Wl W 5 2 I w29 AlAlWl A6Al A 2 1 A l 6 A l 7 w 5 5 LSI A 1 8 O P T I O N 0 0 3 SK158 Figure 5 4 Top View A2 A3 A4 and A5 Unfolded 5 6 Major Assembly and Cable Locations ...

Page 202: ... 3 W50 OPTION 0 0 3 w40 W22 w 3 1 w 3 7 WI7 W48 A OPTION 0 0 2 w3 3 Figure 5 5 Bottom View Al5 Unfolded W I 9 O P T I O N 0 0 1 W 3 6 DELETED IN O P T I O N 0 0 2 W 2 9 w 3 4 A l 5 W 3 2 Major Assembly and Cable Locations 5 7 ...

Page 203: ...AIAI WI8 W 3 2 I WI4 A14 wj7 WI 1 O P T 10 Figure 5 6 Bottom View Al5 and Al4 Unfolded 002 5 8 Major Assembly and Cable Locations ...

Page 204: ...O P T I O N 0 0 2 F L 2 w 3 3 W 4 6 O P T I O N 0 0 2 w 4 3 OPTION 0 0 2 w 5 7 A l 3 w 3 5 W I 0 WI6 A 1 0 3 Al 1 W 4 2 STANDARD WI2 w 3 4 w 4 1 A 3 WI4 OPT 10 0 0 2 O P T I O N 0 0 2 SJlll Figure 5 7 Front End Major Assembly and Cable Locations 5 9 ...

Page 205: ...Bl Figure 5 8 Rear View BTl A20 5 10 Major Assembly and Cable Locations ...

Page 206: ...oting and repair of this instrument without the cover exposes high voltage points that may if contacted cause personal injury Maintenance and repair of this instrument should therefore be performed only by a skilled person who knows the hazards involved Where maintenance can be performed without power applied the power should be removed When any repair is completed be sure that all safety features...

Page 207: ...probed provided caution is used to prevent accidental shorting between adjacent pins Figure 6 l 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 TA test and adjustment Module address line and OS output signal Test jack test points are identified on block diagrams by both the jack pin number and line n...

Page 208: ...I T P 2 AMPLIFIER J A C K r J4 MS8 J4 15j T E S T P O I N T S O N C I R C U I T B O A R D A S S E M B L Y TPI P O S T _ TP2 cpAD PONENT LEAD Figure 8 1 Assembly Test Points T E S T J A C K P I N N A M E T E S T J A C K P I N N U M B E R SK163 General Troubleshooting 6 3 ...

Page 209: ... M P NC A G N D NC NC A G N D 12 6V NC A G N D NC NC A G N D NC P R O B E P O W E R N O T E S c a n R a m p f o r t h e C o n t r o l l e r o r I n t e r f a c e b o a r d s o n l y 49 01 R T DAC 2 NC 45 47 A GN I I V I D E O T R I G 4 6 4 5 S C A N R A M P A G N D 44 43 lOV R E F Y T O E R R O R 42 41 A G N D F C E R R O R CABLE 4LIFSTB 40 39 L F C E N A B L E A G N D l 38 37 L O 3 E R R R F G A ...

Page 210: ...19Wl HPIB C A B L E C O N N E C T I O N S R E A R P A N E L J 3 OD6 9 D OD5 D GND i 87 OD4 003 6 5 D G N D ODZ l 4 3 ODl D GND 2 1 l ODO A2J2 D GND 11 I I 12 L K E Y R P G I R G D GND 0 13 1 4 10 R E F D GND 1 15 1 6 I N C A19Jl R E A R P A N E L J2 S K 1 6 5 Figure 6 2 Ribbon Cable Connections 2 of 2 General Troubleshooting 6 5 ...

Page 211: ...ite 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 alternate softkey menu is displayed under CAL Figure 6 3 illustrates those areas of the CAL menu that are unique to the WR ENA mode of operation 6 6 General Troubleshooting ...

Page 212: ... R R I F S T A T E F U L L I F A D J R E F L V L ADJ J MORE 1 OF 2 t i Ei J Lu P A T T E R N FREQ D I A G N O S E 7 S E R V I C E C A L D A T A MORE 2 OF 2 F L A T N E S S STORE DATA Figure 6 3 WR ENA Softkey Menu General Troubleshooting 6 7 ...

Page 213: ...splay use the following BASIC program to read these errors over HP IB If the program returns an error code of 0 there are no errors 10 DIM Err 128 20 OUTPUT 718 ERR 30 ENTER718 Err 40 PRINTErr 50 END a If there is no response over HP IB set an oscilloscope to the following settings Sweep Time 2ms div Amplitude Scale 1 V div b The signals at A2J202 pin 3 and pin 14 should measure about 4 Vp p If th...

Page 214: ...er 7 ADC Interface Section Chapter 9 Controller Section Chapter 7 ADC Interface Section Chapter 8 IF Section Chapter 8 IF Section Chapter 8 IF Section Chapter 12 Display Power Supply Section Chapter 12 Display Power Supply Section Chapter 10 Synthesizer Section Chapter 11 RF Section Chapter 11 RF Section Chapter 11 RF Section Chapter 10 Synthesizer Section Chapter 11 RF Section Chapter 10 Synthesi...

Page 215: ...ide the limits The TAM locates the failure to a small functional area which can be examined manually Remember the following when using the TAM n Be sure the spectrum analyzer s power is turned off when installing or removing the TAM l Use the HELP softkey found in all menus for useful information n Pressing MODULE will return you to the TAM s main menu n The TAM acts as the active controller on th...

Page 216: ...ent modules with firmware revisions A or B cannot make valid measurements on test connector A14J16 on standard HP 8560A Spectrum Analyzers nor test connector A14J17 on HP 8560A Option 002 Spectrum Analyzers Revision Connectors One test connector on each assembly is reserved as a revision connector The TAM uses the revision connector to identify the assembly s design revision A revision voltage pla...

Page 217: ... with the analyzer s cover in place and requires only the CAL OUTPUT signal as a stimulus The entire procedure takes less than 2 minutes to complete if no failures are found AFI performs checks of five functional areas in a pre defined sequence The sequence minimizes the chance of making false assumptions The TAM checks the analyzer from the inside out For example the ADC is checked before the IF ...

Page 218: ...DACs in the Synthesizer Section RF Check The TAM tests the operation of A8 Low Band Mixer A9 Input Attenuator Second IF Distribution and most of the Al3 Second converter AFI also checks the Flatness Compensation Amplifiers part of the Al5 RF Assembly ensuring that their gain can be adjusted over a certain range If no signal is detected through the RF Section AFI will substitute the 298 MHz SIG ID ...

Page 219: ...r the Revision Connector must be re probed if the spectrum analyzer is returned to normal operation and then back to TAM control This is also true if the analyzer is turned off Cal Osc Troubleshooting Mode The Cal Osc Troubleshooting Mode enables front panel control of the Cal Oscillator on the A4 assembly The Cal Oscillator can be fixed tuned to three different frequencies The Cal Oscillator may ...

Page 220: ... 6 2 1 600 MHz Reference Loop 333 6 21 YTO Leveling Loop 334 6 22 Sampling Oscillator 335 6 22 Automatic IF Errors 400 to 599 6 22 System Errors 600 to 651 6 31 Digital Errors 700 to 799 EEROM Checksum Errors 700 to 704 6 31 Program ROM Checksum Errors 705 to 708 6 32 RAM Check Errors 713 to 714 6 33 Microprocessor Error 717 6 33 Battery Problem 718 6 33 Model Number Error 719 6 34 System Errors 7...

Page 221: ...e 101 NO STATE 106 ABORTED 107 HELLO 108 TIME OUT 109 CtrlFail 110 NOT CTRL 111 ARGMTS 112 CMD 113 FREQ NO 114 TIME NO 115 AMPL NO 116 UNITS 117 NOP NUM 118 NOP EP 119 NOP UPDN 120 NOP ONOF 121 NOP ARG 122 NOP TRC 123 NOP ABLK State to be RECALLed not valid or not SAVEd Current operation is aborted HP IB parser reset No HP IB listener is present Analyzer timed out when acting as controller Analyze...

Page 222: ... a valid argument for this command FULL is not a valid argument for this command LAST is not a valid argument for this command GRT DSP are not valid arguments for this command Argument can only be used with PLOT command PWRON is not a valid argument for this command Argument can only be used with FDIAG command Query expected for FDIAG command No preselector hardware to use command with Invalid COU...

Page 223: ... Transfer roller oscillator PLL is unlocked May indicate loss of 10 MHz reference The 10 MHz reference should measure greater than 7 dBm at A155303 The ADC measures XFRSENSE at the beginning of each sweep and if the voltage is outside certain limits the transfer oscillator pretuned DAC is adjusted to bring XFRSENSE within the proper range ERR 303 is set if this cannot be accomplished Main roller o...

Page 224: ...C is set to 255 before MAINSENSE changes to a negative polarity Main roller pretune DAC set to 255 The main roller pretune DAC is set to 5 causing MAINSENSE to go to the positive rail The DAC is incremented until MAINSENSE changes polarity ERR 311 is set if the DAC is set to 255 before MAINSENSE changes to a negative polarity Unable to adjust MAINSENSE to 0 volts using the fine adjust DAC The coar...

Page 225: ...se DAC is set to bring YTO ERR close enough to 0 volts for the main coil fine DAC to bring YTO ERR to exactly 0 volts ERR 317 is set if the main coil coarse DAC is set to one of its limits before bringing YTO ERR close enough to 0 volts 318 FREQ ACC Main coil fine DAC at limit The main coil fine DAC is set to bring YTO ERR to 0 volts after the main coil coarse DAC has brought YTO ERR close to 0 vo...

Page 226: ...AC sensitivity less than or equal to 0 During the LO adjust routine the fine adjust DAC is set to two different values and the MAINSENSE voltage is measured at each setting ERR 328 is set if the difference between these voltages is 0 or negative This is typically the result of the main roller loop s being unlocked Roller coarse adjust DAC sensitivity less than or equal to 0 During the LO adjust ro...

Page 227: ...ts a fault This routine first adjusts amplitude parameters then resolution bandwidths in this sequence 300 kHz 1 MHz 100 kHz 30 kHz 10 kHz 3 kHz 1 kHz 300 Hz 100 Hz 30 Hz 10 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 ...

Page 228: ...kHz Resolution Bandwidth in first XTAL pole Unable to adjust 10 kHz Resolution Bandwidth in second XTAL pole Unable to adjust 10 kHz Resolution Bandwidth in third XTAL pole Unable to adjust 10 kHz Resolution Bandwidth in Fourth XTAL pole Unable to adjust 10 kHz Resolution Bandwidth in first XTAL pole Unable to adjust 10 kHz Resolution Bandwidth in second XTAL pole Unable to adjust 10 kHz Resolutio...

Page 229: ...dwidth amplitude low in Fourth XTAL pole 1 kHz Resolution Bandwidth amplitude low in first XTAL pole 1 kHz Resolution Bandwidth amplitude low in second XTAL pole 1 kHz Resolution Bandwidth amplitude low in third XTAL pole 1 kHz Resolution Bandwidth amplitude low in Fourth XTAL pole 3 kHz Resolution Bandwidth amplitude low in first XTAL pole 3 kHz Resolution Bandwidth amplitude low in second XTAL p...

Page 230: ...nable to adjust third step Gain stage Lin to log conversion AMPL16 Unable to adjust 30 kHz Resolution Bandwidth in first LC pole Unable to adjust 100 kHz Resolution Bandwidth in first LC pole Unable to adjust 300 kHz Resolution Bandwidth in first LC pole Unable to adjust 1 MHz Resolution Bandwidth in first LC pole Unable to adjust 30 kHz Resolution Bandwidth in second LC pole Unable to adjust 100 ...

Page 231: ...e voltage should be near 15 V during a sweep and between 9 V and 9 V during retrace An intermittent error 499 indicates the Cal Osc phase locked loop probably can lock at 10 7 MHz but cannot lock at the 9 9 and 11 5 MHz extremes This may prevent the 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...

Page 232: ...t 100 Hz Resolution Bandwidth Crystal Sweep problem Unable to adjust 300 Hz Resolution Bandwidth Crystal Sweep problem Unable to adjust 1 kHz Resolution Bandwidth Crystal Sweep problem Unable to adjust 3 kHz Resolution Bandwidth Crystal Sweep problem Unable to adjust 10 kHz Resolution Bandwidth Crystal Sweep problem Unable to adjust symmetry of 10 kHz Resolution Bandwidth in first XTAL pole Unable...

Page 233: ...o pretune VCXO Unable to find CW CAL OSC signal during VCXO pretune at power up CAL Oscillator ID Indicates incompatible hardware Cal Osc not expected LOG Board ID Indicates incompatible hardware Log board not expected Unable to adjust amplitude of log scale Unable to adjust amplitude of log scale Divide by 0 D in CalLogGain problem Unable to adjust amplitude of log scale Divide by 0 M in CalLogGa...

Page 234: ...e Unable to adjust amplitude of log scale High MDACX value in CalLogExpand Possible problem in Log offset Log Expand stage Unable to adjust step gain amplifiers No TOS D in CalDetectors Unable to adjust amplitude of 1 MHz Resolution Bandwidth No TOS W in CalWidebandLog Unable to adjust amplitude of log scale Video offset error O Check video offset circuitry Unable to adjust amplitude of log scale ...

Page 235: ...rks properly the A4 Cal Oscillator sweep generator is failing to sweep its oscillator frequency at the correct rate The error is detected in sweeping on the skirts of the 100 kHz Resolution Bandwidth A properly operating sweep generator generates a series of negative going parabolas These parabolas generate the sweeps used to adjust resolution bandwidths of 10 kHz and below Check the sweep generat...

Page 236: ...alibration Attenuator Calibration Offset error from DC Logger Calibration Attenuator Calibration Absolute error from DC Logger Calibration Fidelity error from DC Logger Calibration Fidelity Offset error from DC Logger Calibration Fidelity Offset unstable from DC Logger calibration Fidelity Gain error from DC Logger calibration System Errors 600 to 651 ADC timeout errors occur if the A2 Controller ...

Page 237: ...TIM Check sum error of frequency response correction data Check sum error of elapsed time data 703 AMPL CAL Check sum error of frequency response correction data Default values being used 704 PRESELCT Check sum error 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 ...

Page 238: ...2U303 Check sum error of system RAM A2U302 Check sum error of system RAM A2U301 Check sum error of system RAM A2U300 Microprocessor Error 717 717 BAD UP Microprocessor not fully operational Refer to Chapter 9 Controller Section Battery Problem 718 718 BATTERY Nonvolatile RAM not working check battery BTl This error can also be generated if the battery has been disconnected then reconnected If this...

Page 239: ... and Adjustment Module and the HP 85620A Mass Memory Module Refer to the option module manual for a listing of error messages User Generated Errors 902 to 904 900 TG UNLVL 901 TGFrqLmt 902 BAD NORM 903 A DLMT 904 B DLMT 905 EXT REF 906 OVENCOL The OCXO oven is cold 907 DO IF CAL Still performing IF Cals or in need of IF Cals which were not yet done due to an OVENCOLD condition These error codes in...

Page 240: ...below See Figure 6 4 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 7 through 12 RF SECTION IF SECTION Figure 6 4 Functional Sections General Troubleshooting 6 35 ...

Page 241: ...ird IF to the 4 8 kHz fourth IF used only in 100 Hz 30 Hz and 10 Hz resolution bandwidths A7 LODA The A7 LODA LO Distribution Amplifier levels the output of the All YTO and distributes the power to the front panel 1ST LO OUTPUT A8 Low Band Mixer Option 002 Tracking Generator and A15A2 Sampler The leveling circuitry is on the Al4 Frequency Control Assembly A8 Low Band Mixer A8 Low Band Mixer is dc ...

Page 242: ... s variable gain 8 to 32 dB compensates for flatness variations within a band Band conversion loss is compensated by step gain amplifiers in the IF Section Control for the amplifiers originates from two DACs on the A3 Interface assembly DAC values are interpolated approximately every 17 MHz based on data obtained during the Frequency Response Adjustment A15 s flatness compensation control circuitr...

Page 243: ...1 Option 003 The PLL can also be locked to an external frequency reference The 10 MHz reference also supplies the reference for the Roller Oscillators the frequency counter on the A2 Controller assembly and the Cal Oscillator on the A4 Log Amplifier Cal Oscillator assembly YTO PLL A7 All P O A14 P O A15 The YTO PLL produces the instrument s first LO 3 0 to 6 81 GHz The oscillator s output is sampl...

Page 244: ...5 5 MHz The three PLLs are the Main Roller PLL Offset Roller PLL and Transfer Roller PLL The Offset Roller PLL tunes from 189 MHz to 204 MHz Because the output of the PLL is divided by 100 a one hundred to one relationship exists between frequency changes in the Offset Roller PLL and the YTO The Offset Roller PLL can be synthesized in 2 5 kHz steps yielding an effective frequency resolution on the...

Page 245: ...tinuous IF adjust ON a group of IF parameters are adjusted during each retrace period non disruptive If continuous IF adjust is OFF the most recent IF calibration data will be used The IF parameters adjusted include step gains log amplifier gain and offset bandwidth centering 3 dB bandwidth bandwidth amplitude crystal filter symmetry and oscillator frequency used in 10 Hz 30 Hz and 100 Hz resoluti...

Page 246: ...tions through address and data lines on the W2 Control Cable Analog Bus Analog signals from these sections are monitored by the ADC Interface Section s ADC Analog to Digital Converter circuit The ADC Interface section includes the A3 Interface Assembly AlAl Keyboard and AlA RPG front panel knob The A3 assembly includes log expand video filter peak detector track and hold real time DACs RF gain DAC...

Page 247: ...er bucket When reset the output of the peak detector equals its input Triggering The HP 8560A has five trigger modes free run single external video and line The Free Run and Single trigger signal comes from the 1 MHz ADC clock The line trigger signal comes from the A6 Power Supply Video triggering originates from A3 s video filter buffer circuit External triggering requires a TTL logic high level ...

Page 248: ... and post accelerator A6Al High Voltage Module contains the high voltage transformer and post accelerator multiplier Power is distributed through W8 to Al7 and through Wl to the rest of the assemblies A6AlW2 supplies CRT cathode and filament voltages to the Al7 assembly The speed of the analyzer s fan is variable A thermistor on A6 senses the temperature and adjusts the fan speed accordingly This ...

Page 249: ...6 44 General Troubleshooting ...

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Page 254: ...rol RF Gain DACs 7 11 A3 Assembly s Video Circuits 7 12 Log Offset Log Expand 7 14 Video MUX 7 15 Video Filter 7 15 Video Filter Buffer Amplifier 7 16 Positive Negative Peak Detectors 7 17 Peak Detector Reset 7 18 Rosenfell Detector 7 18 ADC MUX 7 19 Variable Gain Amplifier VGA 7 21 Track and Hold 7 21 A3 Assembly s ADC Circuits 7 22 ADC Control Signals 7 22 ADC Start Stop Control 7 23 ADC ASM 7 2...

Page 255: ...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 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 RT PULSE 29 HSCAN 30 30 D GND 31 31 20 31 31 tESERVED OFL ERR 33 33 R T DAC3 34 A GND 35 35 16 35 35 F GAIN 36 36 LO3 ERR 37 37 4 GND 38 38 13 38 38 LVFC ENABLE 39 39 FC ERR 4...

Page 256: ...Connections 2 of 2 Signal A GND SCAN RAMP VIDEO TRIGGER A GND NC R T DAC2 R T DACl 43J2 pins 44 45 46 47 49 50 Indicates signal source connectors A4J2 pins 44 47 A5J2 pins 7 4 114J2 pins 44 45 47 50 i I ADC lnterface Section 7 3 ...

Page 257: ...ted W2 control cable or faulty A3 assembly Perform the following steps to determine the cause of the error 1 Disconnect W2 from A3J2 and repeat the Automatic Fault Isolation procedure 2 If the analog data bus error is still present troubleshoot the A3 Interface assembly If the error disappears look for a short on W2 or another assembly connecting to it 3 To isolate a short on W2 reconnect W2 to A3...

Page 258: ...ariable Gain Amplifier VGA Check Video Filter Check Video Filter Buffer Amplifier Check Video MUX Manual Procedure to Perform DC ASM 1DC MUX LDC Start Stop Control iutomatic pault Isolation in this chapter inalog Bus Drivers lutomatic ault Isolation in this chapter inalog Bus Timing nterface Strobe Select eyboard RPG Problems ositive Negative Peak Detectors steps 3 through 10 eak Detector Reset os...

Page 259: ...S1 Video to Rear Panel MS2 Video MUX MS3 LOG Offset LOG Expand MSl MS3 Video Filter Buffer Amp MS3 MS5 OS1 Video Peak Detectors MS5 MS6 ADC MUX MS6 Variable Gain Amplifier MS6 MS7 Track and Hold MS7 MS8 A3J400 Revision Trigger ADC Start Stop Control Video Trigger DAC Real Time DAC l RF Gain DACs MS2 MS8 MS7 MS1 MS3 MS6 7 6 ADC lnterface Section ...

Page 260: ...SK3 SGL SWP LKSNS4 MHz 6 5 4 SK4 COPY LKSNS5 t LKSNSG 1 LKSNS7 z k z 2 0 I I 1 1 0 HOLD SK5 SK6 MKR FRE S P A N AMPLI QUENCY TUDE 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 AlAlWl from A3J602 and again check all inputs to U607 b If any input is low with AlAlWl disconnected suspect A3U604 A3U60...

Page 261: ...nd disconnect AlAlWl from A3J602 Jumper A3U608 pin 12 RPG 01 to U608 pin 14 f5 Vdc Jumper U401 pin 2 RPG 02 to U511 pin 11 HDPKD CLK This provides a 7 8 kHz square wave to the RPG 02 input of the RPG Interface 6 Set the m switch on 7 Check A3U608 pin 9 for narrow low going pulses approximately every 90 ms 8 Check A3U608 pin 13 LRPG RESET for narrow low going pulses approximately every 90 ms 9 Chec...

Page 262: ...mation by selecting each of the following trigger modes and checking the TRIG SOURCE0 and TRIG SOURCE1 lines as indicated in Table 7 6 below 2 If a trigger mode does not work check that a trigger signal is present at the appropriate MUX input as indicated in Table 7 6 Table 7 6 Trigger MUX Truth Table Trigger Mode FREE RUN VIDEO LINE EXTERNAL TRIG SOURCE0 TRIG SOURCE1 U613 pin 14 U613 pin 2 L L H ...

Page 263: ...level check for the presence of pulses on A3U409 pin 15 LDAC2 c While using the front panel knob to adjust the video trigger level check for the presence of pulses on A3U409 pin 16 LWRCLK d Check that pulses are present on U409 pin 6 IAO 9 If the LWRCLK and LDAC2 signals are not correct refer to Interface Strobe Select in this chapter 7 10 ADC lnterface Section ...

Page 264: ...ND 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 3 5 and 5 0 Vdc as the RF Gain DAC setting is increased from 0 to 255 6 If the DVM readings ...

Page 265: ...Troubleshoot the IF Section 6 If the BLANKING OUTPUT is always at a TTL high or low troubleshoot the A3 s trigger circuits 7 Reconnect W26 to A3JlOl and W20 to A2J4 8 Remove the A3 assembly s shield 9 If the video filters appear to be faulty refer to Video Filter in this chapter 10 If there appears to be a peak detector problem refer to Positive Negative Peak Detectors in this chapter 11 Connect t...

Page 266: ... 10 dBm and 30 dBm If the voltage does not change 100 mV per 10 dB step refer to Video Filter Buffer Amplifier in this chapter 18 If the voltage at A3TP17 is correct move the oscilloscope probe to A3TP6 Set the following controls to keep the ADC MUX set to the MOD VIDEO input during the sweep SWEEP TIME OS DETECTORMODE SAMPLE 19 Step the reference level from 10 dBm to 30 dBm while monitoring the v...

Page 267: ...e video 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 101 1 On the HP 8560A press PRESET l j and ZERO SPAN 2 Disconnect W26 coax 2 from A3JlOl and connect the output of a function generator to A3JlOl 3 Set the function generator to the following settings Output Sine wave Amplitude ...

Page 268: ...han the threshold voltage of 2 4 Vdc 6 If A3U104 and A3U109 are working properly set the REF LEVEL to 0 dBm 7 Monitor the voltage at A3TP14 while switching the analyzer between 10 dB div and 2 dB div The voltage should switch between 0 9 and 0 5 Vdc 8 If the voltage at A3TP14 is incorrect suspect either A3Q220 or A3Q221 9 The Video MUX will appear faulty if A3CR109 is shorted or leaky Diode A3CR10...

Page 269: ...o BW 300 Hz 1kHz 3 kHz 10kHz 30kHz 100 kHz 300 kHz 1MHz 3 MHz Pin2 H L L L H L L L L Pin 5 L L H L L L H L L Pin 7 L L L L H H H H L Pin 10 Pin 12 L L L L L L L H L L L L L L L H H L Pin 15 L H L L L H L L L Video Filter Buffer Amplifier See function block W of A3 Interface Assembly Schematic Diagram sheet 5 of 6 The video filter buffer amplifier provides outputs for video trigger positive and neg...

Page 270: ... a The peak to peak deviation of the noise in NORMAL detector mode should be approximately two divisions Note the amplitude levels of the top and bottom of the displayed noise b Select POS PEAK detector mode c Confirm that the noise is about one third division peak to peak The noise should also be no higher than the top of the noise level in NORMAL detector mode d Select NEG PEAK detector mode The...

Page 271: ... 600 4 Check LPOS RST U422 pin 4 for 200 ns low going pulses every 128 pus 5 Check LNEG_RST A3U422 pin 12 for 200 ns low going pulses every 128 ps 6 Set the detector mode to NORMAL and check that LNEG_RST A3U422 pin 12 has two pulses spaced 40 pus apart and then a single pulse approximately 88 ps from the second pulse 7 Check HMUXSELO A3U408 pin 3 and HMUXSELl A3U408 pin 9 according to Table 7 8 T...

Page 272: ...bandwidth and mostly low with a 1 kHz video bandwidth ADC MUX See function block AA of A3 Interface Assembly Schematic Diagram sheet 6 of 6 The ADC MUX switches various inputs into the video path for conversion by the ADC The SCAN RAMP input is used during non zero span sweeps The YTO ERR FCMUX CAL OSC TUNE and OFL ERR inputs are used only during diagnostic and auto adjust routines and during retr...

Page 273: ... U108 If the scan ramp is absent in either mode do the following a Connect the oscilloscope probe to A3J400 pin 15 HSCAN b A TTL signal high during 50 ms sweep time and low during retrace should be present indicating A3 is working properly Refer to the Synthesizer Section troubleshooting procedure A faulty TTL signal indicates a bad A3 Interface assembly 9 Set the HP 8560A to the following setting...

Page 274: ...ace Assembly Schematic Diagram sheet 6 of 6 1 Press PRESET on the HP 8560A and set the controls as follows CENTER FREQ 300 MHz SPAN OHz DETECTOR MODE Sample REF LVL 70 dBm LOG dB DIV 2dB div SWEEP TIME 50ms 2 Disconnect any signal from the analyzer input A full scale display of sampled noise should be present 3 Trigger an oscilloscope on the positive going edge of HHOLD A3U506 pin 16 4 The wavefor...

Page 275: ...als from the A2 Controller Assembly HBADC CLKO 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 Al5 RF Assembly troubleshooting procedure in Chapter 11 3 Set the HP 8560A s ISPAN to zero 4 Reconnect W22 5 With an oscilloscope probe monitor A3J...

Page 276: ... A3U509 pins 2 and 14 are both TTL high 7 Press CAL and REALIGN LO IF During the realignment A3U509 pin 2 should be TTL low and pin 14 should be TTL high If correct the Start Stop Control circuitry is being selected properly by the processor and U508 in the ADC Register block is working properly 8 Press PRESET on the HP 8560A and set the controls as follows SPAN OHz DETECTOR MODE SAMPLE SWEEP TIME...

Page 277: ...h the most significant bit The digital result is then converted to an analog current in DAC U518 and compared with the SAMPLED VIDEO If the DAC current is too high the output of U512 will be high telling the SAR that the guess was high and that the bit just toggled should be set low It then moves on to the next most significant bit until all 12 bits have been guessed at Each guess takes 1 ps one c...

Page 278: ...e DAC output generated for that ramp counter setting HRAMP COMP toggles high indicating the end of a bucket The ramp counter counts horizontal buckets There are 600 buckets per sweep so the ramp bucket counter counts from 0 to 600 The ramp counter is incremented by HRST PK ENA 1 Press w on the HP 8560A and set the controls as follows SPAN lMHz DETECTOR MODE SAMPLE 2 For sweep times between 100 ms ...

Page 279: ...ontrol assembly 5 Press AMPLITUDE and check that pulses occur when toggling between ATTEN settings of 10 and 20 dB 6 Monitor U401 pin 7 LIF_STB with an oscilloscope or logic probe This is the strobe for the A5 IF assembly 7 Press AMPLITUDE and check that pulses occur when toggling between REF LVL settings of 10 dBm and 20 dBm 8 9 10 11 12 13 Monitor U401 pin 9 LLOG_STB with an oscilloscope or logi...

Page 280: ...07 pin 1 goes low approximately 2 ps after HANA BUS A3U400 pin 3 goes high 3 If HANA BUS is absent check for pulses on ABT A3U505 pin 2 and IA10 A3U505 pin 5 4 If A3U407 pin 1 is not delayed 2 11s from HANA_BUS check for the presence of the 1 MHz HBADC CLKO 5 If A3U407 pin 1 is not delayed 2 ps from HANA_BUS and HBADC_CLKO is correct suspect a fault in either A3U414 or A3U400 6 Press c 1 and set t...

Page 281: ...sembly Tables 7 10 and 7 11 are the truth tables for demultiplexers A3U410 and A3U500 Table 7 10 Demultiplexer A3U410 Truth Table Selected Outmt he Pin 15 LSCAN_KBD Pin 14 not used Pin 13 LDACl Pin 12 LDAC2 Pin 11 LDACS Pin 10 not used Pin 9 not used Pin 7 LADC REGl IA1 IA2 IA3 L L L H L L L H L H H L L L H H L H L H H H H H Table 7 11 Demultiplexer A3U500 Truth Table Selected Output Line IA0 IA1 ...

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Page 283: ... Offset 8 16 Video Output 8 16 Frequency Counter Prescaler Conditioner 8 17 AM FM Demodulator 8 17 4 8 kHz IF Filters 8 17 4 8 kHz and 10 7 MHz IF Filters 8 18 10 6952 MHz VCXO 8 19 Input Switch 8 19 LO Switch 8 19 Synchronous Detector 8 2 0 Limiter 8 2 0 Isolation Amplifier 8 2 0 Detector Mixer 8 2 0 Log Offset Gain Compensation 8 21 Log Offset Compensation 8 21 Log Gain Compensation 8 2 1 Video ...

Page 284: ...300 Hz to 3 kHz Resolution Bandwidth Out of Specification 8 36 Low Pass Filter 8 40 Sweep Generator 8 40 AM FM Demodulation Audio Amplifier and Speaker 8 40 8 2 IF Section ...

Page 285: ...ly checked Use Table 8 l to locate the manual procedure Table 8 2 lists assembly test connectors associated with each Manual Probe Troubleshooting test Figure 8 l illustrates the location of A4 and A5 test connectors Figure 8 2 illustrates the levels and paths through the IF Section Note HP 85629B Test and Adjustment Modules with firmware revisions A through F cannot make valid measurements on tes...

Page 286: ...easured in the limiter and a fault here indicates a broken limiter stage Signal path voltages are measured at the input after the video amplifier in the linear path after the offset and gain compensation circuits in the log path and after the video offset The Cal Oscillator is used as an input to the log amp for the purpose of measuring gains Faults in the signal path voltages indicate broken circ...

Page 287: ...4J9 Cal Osc Sweep Gen Hardware MSl MS2 Cal Osc Tune Line Test MS3 Cal Osc ALC Test MS4 Cal Osc Sweep Gen Output MS6 A4510 Detected log input voltage MS1 Limiter bias at end of bias chain MS2 Positive 15 V Supply MS5 A4Jll No connection MS1 Linear video tapped out of log amplifier MS2 Buffered log video before compensation MS3 Log video after temperature and offset compensation MS4 Revision code MS...

Page 288: ...on 4th XTAL Pole Stage Post Amplifier Stage 1 Post Amplifier Stage 3 3rd LC Pole Stage 4th LC Pole Stage IFDAC Channels A IFDAC Channels B IFDAC Channels C IFDAC Channels D Latched IF Control Lines Negative 15 V Supply 5 Volt Supply 10 Volt Reference Measured Signal Liner MSl MS2 MS3 MS2 MS3 MS4 MS3 MS4 MS5 MS4 MS5 MS6 MS5 MS6 MS7 MS6 MS7 MS8 MS8 MSl MS2 MS3 MS2 MS3 MS4 MS3 MS4 MS5 MS5 MS6 MS7 MS6...

Page 289: ...Cs are multiplexed onto test point channels through resistive networks One DAC from each of the quad DAC packages feeds into a network The TAM varies each DAC individually to isolate which ones failed Similarly 10 digitally controlled lines feed into a network and are monitored by the TAM The channels used to monitor the DACs are listed below Channel A A5J9 pin 1 MSl ChannelB A5Jgpin 3 MS3 Channel...

Page 290: ...put A4U811 pin 9 is 100 kHz If it is not verify that the 10 MHz reference is present at A4U811 pin 1 b Verify that the frequency found on the output of the divider A4U808 pin 15 matches the output of the reference divider Matching frequencies indicate the oscillator loop is locked If the loop is not locked troubleshoot the divider oscillator or phase detector c Verify that the frequency found at t...

Page 291: ...justment is halted n If REALIGN LO IF is selected All possible IF adjustments and LO adjustments are made with the most recent IF parameter variables used as the starting point w 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 ICAL menu w If ADJ CURR IF STATE is selected All amplitu...

Page 292: ...h 2 MHz and Narrowband modes RES BW 300 Hz through 100 kHz 2 10 dB DIV and 2 dB DIV log expand modes D Linear Scale Gains On A4 Log Amplifier Assembly E Peak Detector Offsets both Positive and Negative Peak Detectors with respect to normal sample path used by Auto IF Adjust 2 LC Bandwidths A 300 kHz resolution bandwidth center frequency bandwidth and gain B 1 MHz resolution bandwidth center freque...

Page 293: ...Overall gain C Gain variation with input frequency Requirements For the Automatic IF Adjustment routine to work the spectrum analyzer must provide the following basic functions n Power supplies n Control signals n ADC n 10 MHz Frequency Reference to the A4 Log Amp Cal Oscillator a Al5 RF Assembly isolation from the RF signal during IF adjustment Al5 RF Assembly isolation is a function of the REDIR...

Page 294: ...he A4 Log Amplifier assembly Table 8 4 lists the reference level range available in each band with 0 dB input attenuation Table 8 5 lists the input required at A5J3 for displaying a signal at top screen with 10 dB input attenuation and a 0 dBm reference level Table 8 4 Available Reference Level Range Band Frequency Range GHz Ref Level Range dBm I Table 8 5 Signal Level for Reference Level Display ...

Page 295: ... the fault is most likely on the A4 Log Amplifier assembly n If only the 1 dB DIV or 2 dB DIV scales are out of specification the fault is most likely on the A3 Interface assembly Resolution Bandwidths Performance Tests Most resolution 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 100...

Page 296: ... Detector Mixer and outputs a voltage proportional to the log of the input voltage The linear output is tapped off at the emitter of U501D U507 provides input offset adjustment capability and adjusts the offset of the opamp formed by U501A B C and D Q 502 is a buffer Q501 switches in additional offset for digital RBWs The logarithmic characteristic of the base emitter junction of U502B is used in ...

Page 297: ... 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 spectrum analyzers reference level IF Gain Application Guidelines ATTEN lO dB Power into A4J3 Reference Level Gain of A4U201C Gain of A4U201E Total Gain 6 dBm 50 dBm 0 dB 0 dB OdB 4 dBm 60 dBm 0 dB 10 dB 10 dB 14dBm 70 dBm 0 dB 20 dB 20 dB 24 dBm 80 dBm 20 dB 10 dB 30 d...

Page 298: ...yzer 7 The offset DAC A4U102 pin 2 should now be at its default value of approximately 2 45 V The voltage at U601 pin 3 should be approximately 0 V for a DAC output of 2 45 V 8 If this default offset voltage is incorrect DAC U102 is the most probable cause Video Output 1 On the spectrum analyzer press PRESET FREQUENCY 300 K SPAN 100 Hz m 10 dBm and SGLSWP 2 Connect the CAL OUTPUT to the INPUT 50R ...

Page 299: ...ot be demodulated perform the Demodulator Adjustment procedure If the output of A4C707 cannot be adjusted for 50 mVp p as described in the Demodulator Adjustment procedure troubleshoot the A4 FM Demodulator or Audio MUX circuits 4 8 kHz IF Filters Refer to function block N of A4 Log Amplifier Schematic Diagram sheet 3 of 4 in the HP 856OA 61B 63A Spectrum Analyzer Component Level Information binde...

Page 300: ...e spectrum analyzer through a 20 dB attenuator and dc block to the input of the HP 8566A B Set the sweep time of the HP 8566A B to 10 seconds Caution Damage to the HP 8566A B results if a dc block is not used The HP 8566A B and many other spectrum analyzers have dc coupled inputs and cannot tolerate dc voltages on their inputs 5 Set the HP 8566A B to single trigger and press TRACE B CLEAR WRITE Tr...

Page 301: ...in the 10 Hz to 100 Hz resolution bandwidth settings troubleshoot the 10 6952 MHz VCXO Error message 539 may occur if the VCXO is not oscillating If problems exist with the VCXO control voltage error messages 536 or 530 may occur Between sweeps the VCXO at times is turned off To prevent the oscillator from turning off press PRESET FREQUENCY 0 3 GHz SPAN 1 kHz GiYG Input Switch Refer to function bl...

Page 302: ...log amplifier works in the 300 kHz RBW but not in the narrower RBWs troubleshoot the log narrow filter in the limiter or isolation amplifier A4CR302 and A4CR303 are varactor diodes in the limiter filter and are used to tune the filter Limiter Refer to function block G of A4 Log Amplifier Schematic Diagram sheet 2 of 4 in the HP 856OA 61B 63A Spectrum Analyzer Component Level Information binder The...

Page 303: ...pensation circuits inject a i 10 dBm signal into J3 with the analyzer set to log mode Measure A4U503 pin 3 vin 1 and A4U508 pin 3 vout 1 and record the results Decrease the input level to 40 dBm and make the same measurements recording vin 2 and vout 2 The gain is then vout l vout 2 vin 1 vin 2 This gives an offset independent gain measurement Video MUX The video mux switches the video output betw...

Page 304: ...erence 15 dB attenuator also provides gain for changes in analyzer reference level Various buffer amplifiers provide a high input impedance to prevent loading of the previous filter pole and a low output impedance to drive the next filter pole Digital control signals from the W2 Control Cable the analog bus drive the control circuitry At the beginning of each sweep the analog bus sets each control...

Page 305: ... the source connection of a 3 dB power splitter to A5J5 Minicircuits Model ZSC J 2 l Connect one output of the power splitter to the input of an HP 8566A B Spectrum Analyzer Connect the other output of the power splitter to cable W27 coax 3 Note If a 3 dB power splitter is not available an SMB tee and an active probe with a 1O l divider may be substituted Connect the active probe between the tee a...

Page 306: ...8566A B and ADJ CURR IF STATE on the spectrum analyzer The IF signature is displayed on the HP 8566A B display 8 Compare the IF signature to the signature of a properly operating spectrum analyzer illustrated in Figure 8 3 If the signatures do not closely resemble each other a more detailed view of the signature may show the failed hardware a Set the HP 8566A B controls as follows Sweep Time O S d...

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Page 308: ...S B W 3 0 0 kHz V B W 3 0 0 kHz S W P 5 0 0 msec S K 1 7 4 Figure 8 5 Detailed IF Adjust Signature 2 R E F 1 0 0 dBm ATTEN 2 0 dB 1 0 dB S A M P L E I 1 C E N T E R 1 0 7 0 0 0 0 0 M H z S P A N 0 H R E S B W 3 0 0 kHz V B W 3 0 0 kHz S W P 1 4 set S K 1 7 5 Figure 8 8 Detailed IF Adjust Signature 3 8 26 IF Section ...

Page 309: ... B W 3 0 0 kHz V B W 1 kHz SWP 1 4 0 set S K 1 7 6 R E F 1 0 dB S A M P L E r Figure 8 7 Detailed IF Adjust Signature 4 0 dBm I ATTEN 2 0 dB C E N T E R 1 0 7 0 0 0 0 0 M H z S P A N 0 H z R E S B W 3 0 0 kHr V B W 1 kHz SWP 2 0 0 set S K 1 7 7 Figure 8 8 Detailed IF Adjust Signature 5 IF Section 8 27 ...

Page 310: ...spect a broken first step gain stage or a break in the signal path in the input switch first crystal pole or second crystal pole n Correct shape but noisy If the signature resembles Figure 8 10 suspect the second crystal pole output amplifier n Amplitude of Region B of Figure 8 11 varies more than 12 dB Suspect the third step gain stage output amplifier n Region B of Figure 8 12 is kinked Suspect ...

Page 311: ... dl 5 dB S A M P L E t I S P A N Q 1 Hz R E S B W 3 0 0 kHz V B W 3 0 0 kHz S W P 5 0 0 set S K 1 7 9 Figure 8 10 Noise with Correct Shape C E N T E R 1 0 7 0 0 0 0 0 M H z S P A N 0 H z R E S BW 3 0 0 kHz V B W 3 0 0 kHz SWP 5 0 0 set S K 1 8 0 Figure 8 11 Region B Amplitude Variation IF Section 8 29 ...

Page 312: ...t the controls as follows RES BW lMH z SPAN 500kHz FREQUENCY 300MH z 2 On the spectrum analyzer connect the 300 MHz CAL OUTPUT to the INPUT 50ohm 3 If the trace flatness is not within 2 5 dB a failure probably exists 4 A trace similar to Figure 8 13 indicates a crystal short failure 5 Set the spectrum analyzer SPAN to 3 MHz A trace that slopes across the screen see Figure 8 14 indicates a failed L...

Page 313: ...MHz S P A N 5 0 0 0kHz RBW 1 0MHz V B W 1 0MHz S W P 5 0 m s S K 1 8 2 Figure 8 13 Faulty Crystal Short ATTEN 1 0 d B R L 0dBm 10dB A C E N T E R 300 0000MHz S P A N 3 000MHz cRBW 1 0MHz V B W 1 0MHz S W P 5 0 m s S K 1 8 3 Figure 8 14 Faulty LC Pole IF Section 8 31 ...

Page 314: ...less than 0 volts on the FET source indicates a bad FET Bandwidth too wide Check for contamination on the printed circuit board Clean the board as required 3 kHz and 10 kHz Resolution Bandwidth Problems Asymmetric Filter Response Check the crystal symmetry control with the following steps 1 Press PRESET 2 Set the spectrum analyzer controls as follows RES BW 3kHz SPAN 100 kHz FREQUENCY 100kHz 3 On ...

Page 315: ...nalyzer press 1 SPAN ZERO SPAN w 1 IGHz 2 Press CAL IF ADJ OFF 3 Disconnect 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 spectrum analyzer reference level in 10 dB steps 7 At each step the signal displayed on the other spectrum analyzer s...

Page 316: ...nd delivers a 100 kHz logic signal to the phase detector function block V The divide by N circuitry function block Y divides the oscillator output of 9 9 MHz to 11 5 MHz by 99 to 115 resulting in a 100 kHz output to the phase detector When the cal oscillator PLL is locked narrow positive and negative of equal width pulses occur at the phase detector output Since the phase detector drives a low inp...

Page 317: ... CAL OSC AMPTD Range Refer to function block AC of A4 Calibration Oscillator Schematic Diagram in the HP 856OA 61B 63A Spectrum Analyzer Component Level Information binder 1 If A4R826 CAL OSC AMPTD has inadequate range to perform the IF Amplitude Adjustment press LCAL 2 Rotate A4R826 fully clockwise and disconnect W52 coax 9 from A5J4 3 Connect A5J4 to the input of a second spectrum analyzer 4 Set...

Page 318: ...r is not available an SMB tee and an active probe may be substituted Connect the active probe between the tee and the other spectrum analyzer The absolute power levels are approximately 3 dB higher than those stated below due to the elimination of the 3 dB power splitter 4 Press INSTR PRESET on the HP 8566A B and set the controls as follows CENTER FREQUENCY 10 8 MHz SPAN 0 Hz REFERENCE LEVEL 43 dB...

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Page 320: ...th R E F 4 3 0 dBm EF 4 3 0 dBm ATTEN 1 0 dB ATTEN 1 0 dB 1 dB F 1 dB L I 1 I I I I I 1 0 8 0 0 0 0 0 M H z S P A N 0 H z R E S B W 1 0 0 kHz V B W 1 0 kHz SWP 5 0 0 msec S K 1 8 6 C E N T E R 1 0 7 1 0 0 0 0 M H z S P A N 0 H z R E S B W 1 0 kHz V B W 1 kHz SWP 2 0 0 msec S K 1 8 7 Figure 8 18 Output Waveform 1 kHz Resolution Bandwidth 8 38 IF Section ...

Page 321: ... 0 H z RES B W 1 0 kHz V B W 1 kHz SWP 2 0 0 msec Figure 8 19 Output Waveform 300 Hz Resolution Bandwidth R E F 4 3 0 dBm ATTEN 1 0 dB 1 dB I I I I II I I I C E N T E R 1 0 7 1 0 0 0 0 M H z S P A N 0 H z R E S B W 1 0 kHz V B W 1 kHz SWP 2 0 0 msec S K 1 8 8 S K 1 8 9 Figure 8 20 Failed Crystal Set Symptoms IF Section 8 39 ...

Page 322: ...n shorting A4C801 and A4C802 the output is at 0 volts These switches open to start the sweep The output of A4U804A pin 1 is 0 35 V to 10 V depending on the sweep width selected by A4U802A and A4U803A This voltage appears across A4R801 Capacitor A4C801 integrates the current through A4R801 The output of A4U804B is a straight negative going ramp Capacitor A4C802 and resistor A4R802 integrate the out...

Page 323: ...ary the volume and listen for the variation in speaker output level Clipping is normal on the highest settings 6 If the audio is not working correctly monitor the signal at A4U704 pin 3 with an oscilloscope The signal should be 190 mV rms 25 with 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 ...

Page 324: ...8 42 IF Section ...

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Page 328: ... Intensity 9 10 Bad Characters or Graticule 9 10 Long Lines Dimmer Than Short Lines 9 11 Analog Zero Span Problems 9 12 Frequency Count Marker Problems 9 13 Frequency Counter 9 14 State and Trace Storage Problems 9 15 Keyboard Problems 9 16 Note When measuring voltages or waveforms make ground connections to A2TP3 The metal board standoffs are not grounded and should not be used when taking measur...

Page 329: ...ay 1 Connect the printer to the HP 8560A and set the printer s address to the value required by the TAM This is usually 1 2 All of the power supply indicator LEDs along the edge of the A2 Controller assembly should be lit 3 The rear panel CRT llO VDC ON indicator might not be lit even if llO V is present 4 Connect the TAM s probe cable to A2Jll 5 Press 1 SOFT KEY 83 DOWN SOFT KEY I The top soft ke...

Page 330: ...ne less time than the test number For example press it twice for the third test on the list b Press SOFT KEY t3 then SOFT KEY 64 and when the printout is complete SOFT KEY 6 12 If no failures were indicated in testing the A2 Controller move the probe cable to A17J4 13 Press SOFT KEY I and wait five seconds 14 Press SOFT KEY 4 The results will be sent to the printer 15 If no failure is indicated in...

Page 331: ...hould be one half the frequency of the previous line 6 If step 4 reveals problems microprocessor A2Ul is probably faulty 7 Set the HP 8560A s LINE switch off Replace jumper A2El Move the DSA jumper from connecting E5 and E6 to connecting E6 and E7 Display Problems Line Generators See function blocks D and I of A2 Controller Schematic Diagram sheet 1 of 4 in the Component Level Information binder T...

Page 332: ...gure 9 2 Line Generator Output Waveforms Blanking See function block J of A2 Controller Schematic Diagram sheet 1 of 4 in the Component Level Information binder 1 Using an oscilloscope check for blanking pulses at A2J202 pin 15 A2U206 pin 6 should be at a TTL high Blanking pulses turn the CRT beam off during the sample time of the line generators and when moving the CRT beam to a new position for ...

Page 333: ...ing divisions shows character mode VECTOR pulses 3 ps apart The BLANK pulses are synchronized to the VECTOR pulses by U214B The fourth trace shows the double pulses which delay the leading and trailing edges of the blanking pulses 6 Set the oscilloscope to the following settings to expand the first and fourth traces This displays how the rising edges of U213 13 determine the transitions of the bla...

Page 334: ...k different from those illustrated in Figure 9 2 check the waveforms at the low pass filter s input function block E 3 The waveform at the low pass filter should look like X POS in Figure 9 2 but have an amplitude from 0 V to 5 V 4 If the waveform in step 3 is incorrect set an oscilloscope to the following settings Amplitude Scale 10 V div Sweep Time 20ps div Triggering External 5 Trigger the osci...

Page 335: ...re not readily observable with an oscilloscope Continue with step 8 to observe the DAC outputs 8 To break the effect of feedback in the line generators and to observe the output of the DACs short J201 pin 1 to TP3 to observe U203 pin 1 and TPl Continue with step 9 9 Set an oscilloscope to the following settings Amplitude Scale 5 V div Sweep Time l ms div Coupling AC Triggering External 10 Trigger ...

Page 336: ...enerates a ramp the output vector which feeds back to U201A U203A and shows on its output 5 0 V div 0 0 0 v 1 0 0 ms div 0 000 s U201A 1 TP2 U203A 1 TPI S K 1 9 5 Figure 9 6 Distorted X Y Line Generator Waveforms 5 0 V div 0 0 0 v 2 0 0 us div 0 0 0 0 s U201A 1 T P 2 U203A 1 TPl S K 1 9 6 Figure 9 7 Expanded X Y Line Generator Waveforms Controller Section 9 9 ...

Page 337: ... DISPLAY If the intensity does not change troubleshoot the intensity DAC A2U212A A2U212A is controlled from the front panel The amplitude of the waveform at U211A pin 1 should increase or decrease with intensity changes Clamp U211B limits the voltage to about 4 2 V Short A2J201 1 to ground and set the intensity DAC to a number greater than 80 A major portion of the waveform should be limited to 4 ...

Page 338: ...cilloscope to A2J201 pin 2 Connect channel B to A2U210D 14 3 4 5 Set an oscilloscope to the following settings Amplitude scale 10 V div Sweep time 1 ms div Triggering External Externally trigger the oscilloscope off the signal at A2U207 pin 8 LBRIGHT The waveforms should look like those illustrated in Figure 9 9 If the waveform at J201 pin 2 is bad troubleshoot the X Line Generator function block ...

Page 339: ...o the following settings Amplitude scale 10 V div Sweep time 1 ms div Triggering External 3 Externally trigger the oscilloscope off the signal at A2U207 pin 8 LBRIGHT 4 The display should be similar to Figure 9 11 except that the untriggered trace should show at the left edge of the screen In these settings DEFl causes switching between the line generators and the analog inputs sweep and video DEF...

Page 340: ...ock Q of the A4 Schematic Diagram Perform the following steps to determine whether the problem is on the A4 Log Amplifier Cal Oscillator or A2 Controller assembly 1 2 3 4 5 6 7 Disconnect W53 from A2J7 Connect the output of a synthesized source such as an HP 3335A to A2J7 Set the synthesized source to the following settings Amplitude lO dBm Frequency 5 35MHz Set the HP 8560A to the following setti...

Page 341: ...511 pin 3 is high The FREQ COUNT input A2J7 is gated in U511B by HBKT PULSE The gated signal clocks divide by 16 counters U703A and U703B These counters are cascaded to form a divide by 256 counter The MSB of this counter CD7 clocks the CLKO input of U700 The frequency of CD7 is a function of COUNTER RES as shown in Table 9 2 If Timer U700 overflows OUT0 will be set and U701B clocked generating CN...

Page 342: ...ms STATE storage is in the two Program RAMS and TRACE storage is in the two Display RAMS With low battery voltage it is normal for STATES and TRACES to be retained if the power is off for less than one minute If the power 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...

Page 343: ...alue 3 If the display shows the analyzer to be in RMT and the ATTEN value displayed on the CRT changed according to the program the A2 Controller assembly is working properly Refer to Chapter 7 ADC Interface 4 If there was no response over HP IB the A2 Controller is probably defective Be sure to also check the A19 HP IB assembly and A19Wl 5 If there was an improper response for example the display...

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Page 345: ...Hz to 20 MHz lo 17 Roller Oscillator Span Problems LO Spans 51 MHz lo 18 First LO Span Problems All Spans lo 21 UnlockedYTO PLL lo 23 Operation l0 23 Troubleshooting an Unlocked YTO PLL lo 25 Unlocked Roller Oscillator PLL lo 32 Operation l0 32 Confirming an Unlocked Condition lo 32 Offset Oscillator PLL lo 33 Transfer Oscillator PLL lo 35 Main Oscillator PLL lo 37 Unlocked Offset PLL Sampling Osc...

Page 346: ...mbly In addition the Al4 assembly s Roller Oscillator PLL is actually comprised of the following three PLLs Main Oscillator PLL Transfer Oscillator PLL Offset Oscillator PLL This is not the same as A15 s Offset PLL The Main Oscillator PLL is sometimes swept backwards higher frequency to lower frequency This is necessary because of the way in which the Sampler IF signal is produced Note The Frequen...

Page 347: ...ampling Zenter Frequency MHz Oscillator s Frequency MHz 389 5 280 0 427 0 282 5 449 5 284 0 464 5 285 0 479 5 286 0 502 0 287 5 509 5 288 0 539 5 290 0 569 5 292 0 577 0 292 5 599 5 294 0 614 5 295 0 629 5 296 0 652 0 297 5 659 5 298 0 5 Disconnect W37 from A14J301 6 Connect a test cable from W37 to the input of another spectrum analyzer Tune the other spectrum analyzer to the following settings C...

Page 348: ...d 13 dBm Set jumper A14J23 to the NORM position and reconnect the All YTO 12 On the HP 8560A press 1 ICAL MORE FREQ DIAGNOSE and MAIN ROLLER Note the Main Roller Oscillator s frequency Main Roller Oscillator s Frequency M Hz 13 Disconnect W32 from A14J501 and connect the output of a signal source to A14J501 Connect a DVM s positive lead to A14J17 pin 1 and negative lead to A14J17 pin 6 See Figure ...

Page 349: ...y test cable from an HP 8340A B Synthesized Sweeper to A15A2Jl See Figure 10 2 20 Connect a BNC cable from the HP 8560A s 10 MHz REF IN OUT to the HP 8340A B s FREQUENCY STANDARD EXT input 21 Set the HP 8340A B to the following settings FREQUENCY STANDARD EXT POWER LEVEL 5 dBm FREQ STEP 7 5 MHz 22 Set the HP 8560A to the following settings SPAN OHz CFSTEP 7 5 MHz 23 Set the HP 8560A and HP 8340A B...

Page 350: ... a sampler IF of 100 2 MHz suspect the Al5 RF Assembly 25 Reconnect W34 to A15A2Jl and W32 to A15JlOl 26 If YTO unlocks only with certain center frequency and span combinations terminate the 1ST LO OUTPUT in 50 ohms 27 Set the HP 8560A s CENTER FREQ and m to generate the unlock conditions 28 Set the HP 8560A s trigger to SINGLE 29 Move jumper A14J23 to the TEST position 30 Disconnect W34 from A15A...

Page 351: ...done with the HP 8560A s SPAN set 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 520 MHz but this pretune accuracy shifts f10 MHz as a function of the S...

Page 352: ...quency 10 MHz Troubleshooting Using the TAM When using Automatic Fault Isolation the TAM indicates suspected circuits that need to be manually checked Use Table 10 4 to locate the manual procedure Table 10 5 lists assembly test connectors associated with each Manual Probe Troubleshooting test Figure 10 3 illustrates the location of Al4 and Al5 test connectors Al4 Al5 FREQUENCY RF CONTROL J901 3501...

Page 353: ...une DAC Clheck Main Roller Sweep Hold Switches Check Offset Oscillator and Buffer Amp Manual Procedure to Perform Confirming a Faulty Synthesizer Section steps 9 11 Unlocked YTO PLL steps 10 13 Third LO Driver amplifier steps l 6 Unlocked Reference PLL steps 8 13 Unlocked Reference PLL steps 12 and 13 Confirming a Faulty Synthesizer Section steps l 4j Confirming a Faulty Synthesizer Section steps ...

Page 354: ...eck YTF Gain and Offset DACs Check YTO FM Coil Driver Check YTO FM Coil Driver and Main Loop Error Voltage Driver Manual Procedure to Perform Offset Oscillator PLL steps 14 18 Offset Oscillator PLL steps 9 13 Offset Oscillator PLL steps 4 8 First LO Span Problems 51 MHz step 8 Offset Oscillator PLL steps 20 23 Unlocked Reference PLL steps 17 25 1 Unlocked Offset PLL steps 3 7 14 19 Unlocked YTO PL...

Page 355: ...il Course DAC MS3 Main Coil Fine DAC MS2 Main Coil DACs Output MS5 YTO Loop Phase Detector MS1 Main Loop Error Volt DVR MS4 Option Drive MS8 Option Drive Switch MS7 Option Drive DAC MS6 A14J18 f10 V Reference MSl MS2 LODA Drive MS5 MS6 MS7 MSE A14J19 Main Coil Tune DAC MS3 Sweep Generator DAC MS4 Sweep Generator Switches MS4 Second Conv PIN Switch MS8 Second Conv Mixer Bias MS1 Second Conv Drain B...

Page 356: ...upply MS2 Offset Lock RF Buffer MS4 IF AMP Limiter Bias MS6 Offset Lock Loop Buffer D MS7 Offset Lock Loop Buffer C MS8 Sampler Bias Test MS3 A15J502 Positive 15 Volt Supply MS2 Third LO Tune Voltage MS3 Offset Lock Loop Buffer MS4 600 MHz Oscillator Bias MS5 Calibrator AGC Amp Bias MS6 Calibrator Amp1 Adj MS7 3rd LO Driver Amp MSl MS8 A15J602 Positive 15 Volt Supply MS8 Flatness Compensation 3 MS...

Page 357: ...ference frequency error 2 will be multiplied by its harmonic on the PLL s output n A mixer reference frequency error 3 produces the identical error on the PLL s output n If divider input or output frequencies 4 are wrong check for incorrect divide numbers and data controlling the dividers PRETUNE ALTERNATE PATH UP DOWN REFERENCE I NPUT S K 1 1 0 4 Figure 10 4 PLL Locked at Wrong Frequency Unlocked...

Page 358: ...SENSE OUTPUl S K 1 1 0 5 Figure 10 5 Unlocked PLL 2 If the integrator s output voltage changes in the manner described in step 1 the problem is external to the PLL For example the pretune DAC could be faulty If the integrator s output voltage appears incorrect confirm that the pulses out of the phase detector 2 are attempting to tune the oscillator in the correct direction 3 If the phase detector ...

Page 359: ...f the analyzer Refer to Table 10 6 for a listing of sweep signal destinations versus First LO spans Sweeping the Roller Oscillator s Offset Oscillator PLL results in sweeping the YTO s FM coil There is a one to one relationship between the roller oscillator s frequency span and the first LO s span Table 10 6 Sweep Signal Destination versus Span First LO Span Sweep Signal Destination 20 MHz All YTO...

Page 360: ...ator PLL 3 If there are several spans in the main coil FM coil and roller span ranges affected suspect A14 s span attenuator YTO Main Coil Span Problems LO Spans 20 MHz For YTO Main Coil spans the YTO is locked at the beginning of the sweep and the sweep ramp is summed into the Main Coil Tune Driver 1 Perform the YTO Adjustment procedure in Chapter 2 If the YTO Adjustments cannot be performed cont...

Page 361: ...chematic sheet 2 of 5 5 Check the state of the Main FM VCO Sweep Switches as indicated in Table 10 8 6 The rest of the procedure troubleshoots the YTO FM Coil Driver Refer to function block N of Al4 Frequency Control Schematic sheet 2 of 5 Table 10 8 Settings of Sweep Switches I Switch I Switch State U318A Open U318C Open U318D Closed U324A Closed U324B Closed U324C Open Switch Control Line Pin 1 ...

Page 362: ...per A14J23 Roller Oscillator Span Problems LO Spans 51 MHz The following procedure troubleshoots problems with the Roller Oscillator PLL s Main Oscillator 101 kHz to 1 MHz and Offset Oscillator 5 100 kHz 1 Set the HP 8560A to the following settings CENTER FREQ 300 MHz SPAN lMHz RES BW 10kHz VIDEO BW 10kHz SWEEPTIME 50ms 2 Set an oscilloscope to the settings listed below and monitor A14J17 pin 1 Th...

Page 363: ... lower sideband of a Sampling Oscillator s comb tooth The YTO always sweeps forward lower frequency to higher frequency but the Roller Oscillator sometimes sweeps backwards higher frequency to lower frequency The FREQ DIAGNOSE menu will indicate a negative Main Roller frequency in this instance S o u r c e C Chon 1 1 C S l o p e 1 A u t o S c a l e C E n a b l e d 1 Leve I C A d j u s t 1 2 5 0 0 ...

Page 364: ... the sweep ramp is correct at A14J15 pin 13 but the Roller Oscillator is not sweeping properly in spans 5100 kHz troubleshoot the Offset Oscillator Sweep Hold circuit Refer to function block AD of Al4 Frequency Control Schematic sheet 5 of 5 If the Offset Oscillator Sweep Hold circuit is operating properly Replace the A14AlOl Offset Oscillator Refer to Function Block AE of Al4 Frequency Control Sc...

Page 365: ...should be present 8 Change the HP 8560A s span to 500 kHz and check for a 0 V to 5 V ramp at U323 pin 6 9 Change the HP 8560A s span to 200 kHz and check for a 0 V to 2 V ramp at U323 pin 6 10 Set the HP 8560A to the following settings START FREQ l0 MHz STOP FREQ 2 9 GHz SWEEPTIME 80ms 11 Monitor A14J15 pin 14 for a 0 V to 9 V ramp Switches U317A U317B and U317D should be open and U317C should be ...

Page 366: ... should be set as listed in Table 10 10 20 Check that U312D opens when the sweep time is set to 2 seconds 21 Check that U312B and U312C close when the sweep time is set to 20 seconds Table 10 10 Settings for Switches and Comparators Sweep Time 200 ms 2 s 20 s Switch Switch U312B U312C Open Open Open Open Closed Closed Switch U312D Closed Open Open Comparator Comparator U319A Pin 1 U319B Pin 7 High...

Page 367: ...and what polarity the YTO error voltage should have positive or negative to maintain lock To check if a negative Sampler IF is selected press CAL MORE FREQ DIAGNOSE MAIN ROLLER If the Main Roller Oscillator frequency is positive the Sampler IF is also positive A negative Main Roller frequency indicates that the Sampler IF is negative Notice that the polarity of the YTO loop error voltage YTO LOOP ...

Page 368: ...set Roller Oscillators have opposite sense with respect to the VCO span ramp VCO RAMP A positive going ramp moves the Main Roller Oscillator lower in frequency Main Roller spans while a positive going ramp moves the Offset Roller Oscillator higher in frequency Offset Roller spans Thus the polarity of the VCO Sweep Driver depends on whether a Main Roller or Offset Roller LO span is selected Table l...

Page 369: ...ositive Negative Does not apply TTL High Does not apply Does not apply TTL Low Does not apply Troubleshooting an Unlocked YTO PLL 1 If the YTO PLL is unlocked error code 301 should be displayed Place the HP 8560A in ZERO SPAN Figure 10 8 illustrates the simplified YTO PLL 2 Move the jumper on A14523 to connect pins 2 and 3 TEST position Refer to Figure 10 3 for the location of A14523 Error code 30...

Page 370: ...error by subtracting the frequency recorded in step 3 from the frequency recorded in step 4 Record the result below YTO Frequency Error MHz YTO Frequency Error YTO Frequency MEASURED YTO FreqUenCy CALCuLATED 6 On the HP 8560A press MORE FREQ DIAGNOSE and MAIN ROLLER Record the Main Roller frequency below Main Roller Frequency MHz 7 If the YTO Frequency Error recorded in step 5 is greater than 30 M...

Page 371: ...is a function of where the main roller oscillator is tuned The Main Roller Frequency column showing polarity indicates whether the YTO frequency is above t or below the sampler s harmonic b If the YTO Frequency Error recorded in step 5 is outside the range listed in Table 10 12 perform the following steps i Check the YTO Adjustments using the TAM ii Check the YTO DACs using the procedure in steps ...

Page 372: ...the 1ST LO OUTPUT amplitude is out of the specified range perform the First LO Distribution Amplifier Adjustment procedure Refer to Chapter 2 14 Set the HP 8560A to the following settings CENTER FREQ 300 MHz SPAN 0 Hz 15 Monitor the Roller Oscillator PLL s output at A14J304 ROLLER TST with a synthesized spectrum analyzer such as an HP 8568A B or HP 8566A B Refer to function block AQ of Al4 Frequen...

Page 373: ...ator frequency is 73 MHz this is changed to l 30 10 MHz If the Roller Oscillator is 93 MHz the accuracy is changed to lO 30 MHz This is done by changing the Main Coil Coarse DAC to keep the Sampler IF within the acquisition range of the YTO Loop When dealing with the Sampler IF and an unlocked YTO the same frequency differences apply to the Sampler IF 28 Set the HP 8560A to the following settings ...

Page 374: ...z to 20 MHz 36 Remove jumper A14J23 and connect a dc power supply to A14J23 pin 2 Set the dc power supply to t7 5 Vdc 37 Verify the nominal test point voltages listed in Table 10 13 38 Change the input voltage to 7 5 volts and re verify that the voltages listed in Table lo 13 are the same except for a change in polarity 39 The Main Loop Error Voltage Driver has a gain of either 1 5 or 15 the analy...

Page 375: ...oller Oscillator frequency is 93 MHz the accuracy is changed to lO 30 MHz This is done by changing the Main Coil Coarse DAC to keep the Sampler IF within the acquisition range of the YTO Loop When dealing with the Sampler IF and an unlocked YTO the same frequency differences apply to the Sampler IF 45 Set the HP 8560A to the following settings CENTER FREQ 300MHz SPAN 0 Hz 46 Place jumper A14J23 in...

Page 376: ...he primary cause of the failure Be sure to query the error message buffer for all encountered errors by pressing m MORE RECALL ERRORS and using the knob or step keys to scroll through all encountered errors The frequency displayed for the Offset Roller using the above procedure is the Offset Roller frequency loo During the LO ADJUST sequence performed at power on pretune DAC values for Roller Osci...

Page 377: ... of 5 in the Component Level Information binder A14TP302 A14AlOl 189 MHz to 204 MHz U102 pin 2 189 MHz to 204 MHz 3 dBm 2 Measure the Offset Amp and Offset Ox Bias voltages at the following test points A14J302 pin 5 Offset Amp Bias A14J302 pin 2 Offset Osc Bias between 2 and 4 Vdc between 7 and 8 Vdc 3 The oscillator s power level measured with an active probe at TP302 should measure 15 dBm 4 Set ...

Page 378: ...e amplitude of the signal at UllO pin 3 should measure greater than 0 1 Vp p Note Integrated circuit UllO contains the reference and VCO dividers phase detector and modulus pre scaler control circuitry 15 Set the HP 8560A to the following settings CENTER FREQ 300MHz SPAN 0 Hz 16 Check that there are narrow l psec pulses 400 psec apart at UllO pin 18 reference divider output and UllO pin 15 VCO div...

Page 379: ...al mixes with the Main Roller PLL s output producing the roller IF at approximately 2 MHz The roller IF is compared to the Offset Oscillator s divided output to phase lock the main roller oscillator 1 Use an active probe or sniff loop connected to a spectrum analyzer to test for an output from the A14A102 Transfer Oscillator The amplitude at TP301 should be approximately 4 dBm Refer to function bl...

Page 380: ...ould equal the Transfer Oscillator frequency divided by 32 15 Confirm that U127 pin 1 is high The signal amplitude at U127 pin 3 is 21 Vp p 16 Set the HP 8560A to the following settings CENTER FREQ 300MHz SPAN 0 Hz Note Integrated circuit U124 contains the reference dividers VCO dividers phase detector and modulus pre scaler control circuitry Refer to function block AH of Al4 Frequency Control Sch...

Page 381: ...L loops are locked 1 Measure the signal power at A145304 The signal should measure greater than 33 dBm 2 Measure the signal at A14TP305 The signal s nominal power should measure 16 dBm 3 If the output of A14TP305 is not correct confirm that the voltage at J303 pin 1 Out Amp Bias is between 3 Vdc and 6 Vdc Refer to function block A0 of Al4 Frequency Control Schematic sheet 5 of 5 in the Component L...

Page 382: ...ve with a lower limit between 0 V and to 5 V and an upper limit between 3 V and 5 V Refer to function block AL of Al4 Frequency Control Schematic sheet 5 of 5 18 The signal at U105 pin 1 should have a similar waveform as U106 pin 7 but may be different in amplitude from the Offset Oscillator Dividers U103 and U104 19 The Offset Oscillator Divider function block AJ is probably at fault if the signa...

Page 383: ... the Offset Lock Loop may be set Troubleshooting 1 Use an active probe and spectrum analyzer to confirm the presence of the following references to the Offset Lock Loop s input A15TP404 300 MHz at 5 dBm A15TP408 10 MHz TTL level 2 If either of these signals is not correct refer to Unlocked Reference PLL in this chapter 3 Force the PLL to unlock by shorting A15X201 pin 1 to A15X201 pin 5 with a sho...

Page 384: ...igh low 296 0 629 5 2 5 2 0 high low low low high 297 5 652 0 1 4 2 5 low low low high low 298 0 659 5 1 5 2 0 low 1 low low low high I INI M 1 1 Bl 1 B2 I B3 I B4 I B5 c To set the Sampling Oscillator to a desired frequency set span to 0 Hz and CENTER FREQ to the value listed in the table tThe signals at TP406 and TP407 are TTL levels 10 Measure the 280 MHz loop feedback signal at the following t...

Page 385: ...15J200 pin 16 disconnect the power supply 21 Connect A15TP406 to A15TP407 This forces both phase frequency detector inputs to the same 2 5 MHz signal 22 Observe the phase frequency detector outputs U406 pins 5 and 8 with an oscilloscope Narrow TTL pulses should be present Pin 5 is normally low pulsing high and pin 8 is normally high pulsing low 23 Check the cathode of CR401 with an oscilloscope Wi...

Page 386: ... and 10 MHz INT 5 Measuring tune line voltage LO3 ERR indicates if the Reference PLL is locked Measure the voltage at A15J502 pin 3 Connect the ground lead to A15J502 pin 6 6 If voltage is not between 0 V and 5 75 V the loop is unlocked and ERR 333 600 UNLK should be displayed on the CRT 7 If the 600 MHz oscillator is working the reason for the unlocked condition is either a problem in the 10 MHz ...

Page 387: ... if there is no input signal at U504 pin 3 U504 pin 5 will be TTL low and U504 pin 9 will be TTL high If there is no input signal at U504 pin 11 U504 pin 9 will be TTL low and U504 pin 5 will be TTL high To remove the 10 MHz reference input to the Phase Frequency Detector press AUXCTRL REAR PANEL and 10 MHz EXT with no signal applied to the rear panel 10 MHz REF IN OUT connector To remove the divi...

Page 388: ...505 d If the CAL OUTPUT signal level is greater than 10 dBm troubleshoot the PIN diode attenuator the detector or the feedback path 30 Measure the detector voltage at A15J502 pin 14 The voltage should measure approximately 0 3 Vdc when the CAL OUTPUT signal is at 10 dBm This voltage should change with adjustment of A15R561 CAL AMPTD 31 Check that the voltage at U507A Pin 3 is 1 7 Vdc If this volta...

Page 389: ...wanted products from A15A2 s output and amplifies the IF to a level sufficient to drive the YTO loop When the IF is between 78 and 87 MHz PIN diodes switch a 120 MHz notch filter in the sampler IF section 1 Set HP 8560A to the following settings CENTER FREQ 300 MHz SPAN OHz 2 Disconnect W32 from A15JlOl 3 Connect the input of a power splitter to A15JlOl Connect W32 to one of the splitter outputs C...

Page 390: ...cuitry Continue with the following steps 9 Set the HP 8560A to the following settings CENTER FREQ 300MHz SPAN OHz 10 Set a microwave source to the following settings Frequency 4 2107GHz Amplitude 5 dBm 11 Connect the microwave source to A15A2Jl 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 sig...

Page 391: ...pin 1 When the ramp reaches lO V for single band sweeps HSCAN is brought low and the integration ends During normal non fast zero spans sweep times 30 ms comparators U319A and B are high This turns on diodes CRl CR2 CR3 and CR4 Note that the integrating current maximum value 236 PA actually flows backwards through diodes CR3 and CR4 During retrace HSCAN is low closing U306B and U312A See Figure 10...

Page 392: ...C14 Cl5 Cl6 CURRENT SOURCE I SWEEP U308 RZO R24 C R 6 U312B C D 75oR 0 R 2 9 R65 U31 12A 5 2 6 K IK U312D S K 1 1 1 0 Figure 10 10 Simplified Sweep Generator during Retrace IO 48 Synthesizer Section ...

Page 393: ... 3 T O 1 0 5 5 M H z W H E N L O C K E D S A M E A S M A I N R O L L E R FREO 1 0 M H z A P P R O X OdBm I I O F F S E T P L L w 3 7 I G R A Y G R E E N I 6 0 0 MHz A P P R O X 0 dBm I 1 T O A l 3 SECOND CONVERTER A15AZJl u I t I 10 M H z I TCXO I I 4 I DE FdTED I I I OPT 003 SK1111 Figure 10 l 1 Simplified Synthesizer Section A J J305 Q w 4 9 O P T 0 0 3 iA21 oc tOl O P T 003 I I I I I h e J Synt...

Page 394: ...VER 1 56 MHz V I T U N E D A C V C O R A M P F R O M V C O S W E E P D R I V E R M A I N R O L L E R S W E E P H O L D J304 ROLLER TEST 25 d r M A I N P L L M A I N M I X E R X F E R O S C T P 3 0 1 4 dBn TP304 T T L I I II I I I I I I I 1 I I I I I I I I I I I I I I A14J301 1 0 M H z I REFl F R O M Al5 0 dBm I t I S K 1 1 1 2 Figure 10 12 Simplified Al4 Assembly Block Diagram lo 50 Synthesizer Se...

Page 395: ...L I 3a I 1 0 M H z DIST 1 0 M H z T C X O O F F S E T P L L I T T L L E V E L I I I I I I I I T T L J701 600 MHz 2 N D L O D R I V E 0 dBm m m __ 1 0 MHz A 2 1 0 OPTION J303 1 0 M H z REFl T O 4 L i 3301 1 0 MHz R E F I N O U T 0 dBm I N 2 T O lO dBm OU7 A l 4 0 dBm 3304 1 0 M H z REFZ T O A 4 0 dBm J302 T O M H z FREQ C O N T T O A 2 T T L L E V E L FROM c x o 003 S K 1 1 1 3 Figure 10 13 Simplif...

Page 396: ...cally 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 misadjustment Check operation ...

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Page 399: ...y Third Converter 11 10 Confirming Third Converter Output 11 11 Third Converter 1 l 11 Flatness Compensation Control 11 13 Control Latches 11 13 SIG ID Oscillator 11 13 10 MHz Reference ll 14 A10 Tracking Generator Option 002 11 18 Block Diagram Description 11 18 Output Goes Unleveled ERR 900 or ERR 901 11 19 Excessive Residual FM 11 20 Flatness Out of Tolerance 11 21 Vernier Accuracy Out of Toler...

Page 400: ...m analyzer input Troubleshooting Using the TAM When using Automatic Fault Isolation the TAM indicates suspected circuits that need to be manually checked Use Table 11 2 to locate the manual procedure Table 11 l lists assembly test connectors associated with each Manual Probe Troubleshooting test Figure 11 l illustrates the location of A15 s test connectors A l 4 FREQUENCY CONTROL J5Ol J304 J302 J1...

Page 401: ...er Check PIN Switch Check PIN Switches in SIG ID Oscillator Check Second Converter Control Check SIG ID Oscillator Check SIG ID Oscillator Operation Check Third Converter Manual Procedure to Perform Third Converter Third Converter Third Converter Calibrator Amplitude Adjustment in Chapter 2 A7 LODA LO Distribution Amplifier A9 Input Attenuator A13 Second Converter Al3 Second Converter steps 1 to 6...

Page 402: ...MS3 MS3 MSl MS8 MS5 MS6 MS7 MS2 Low Band Problems 50 Hz to 2 9 GHz 1 Disconnect all inputs from the front panel INPUT 500 connector 2 Set the HP 8560A to the following settings C E N T E R F R E Q 0 Hz SPAN 1 MHz INPUT ATTEN OdB 3 The LO feedthrough s amplitude observed on the display should be between 6 and 3 0 dBm Note The marker will not PEAK SEARCH on the LO Feedthrough when in a non zero span...

Page 403: ... the HP 8560A to the following settings CENTER FREQ 300MHz SPAN OHz 5 Place the jumper on A14J23 in the TEST position Remove W38 from the input of the A7 LODA 6 Use a power meter or another spectrum analyzer to measure the output of All YTO The power should be between 9 dBm and 13 dBm 7 Reconnect W38 to the LODA Place the jumper on A14J23 in the NORM position 8 If ERR 334 unLevelled output is pres...

Page 404: ...ore negative than 9 4 Vdc 6 Move the jumper from A14J18 pin 1 to A14J18 pin 2 The voltage measured on the DVM should be more positive than t12 3 Vdc 7 If the voltages do not meet the limits listed in steps 4 and 5 troubleshoot the Al4 Frequency Control assembly 8 Connect the positive DVM lead to A14JlO pin 1 9 The measured voltage should be approximately 5 Vdc If the voltage is not 5 Vdc troublesh...

Page 405: ...one or more logic levels listed in Table 11 3 is incorrect disconnect Wll from A14J6 and repeat step 4 checking only pins 3 5 11 and 13 of A14U420 Pins 4 6 10 and 12 should all read low TTL levels 7 If one or more logic levels listed in Table 11 3 is incorrect with Wll disconnected troubleshoot the Al4 Frequency Control assembly 8 If all logic levels are correct the A9 Input Attenuator is probably...

Page 406: ...probably on the Al5 RF Assembly Reconnect W33 to A13J4 Connect a DVM s positive lead to A14J19 pin 15 and the negative lead to A14J19 pin 6 If the DVM does not measure between 14 0 Vdc and i 15 0 Vdc perform the following a Set the HP 8560A s LINE switch off and disconnect W13 from A14J12 b Set the HP 8560A s LINE switch on and set the analyzer to the following settings CENTER FREQ 300MHz SPAN l0 ...

Page 407: ...ltage item a A14J18 pin 14 should be above 0 V If the output power is high the voltage should be more negative than 10 V If the voltages do not measure as indicated check that the voltages at A14J18 pins 5 and 13 item 4 are consistent with the operational amplifier s output Note If a TAM is available use Manual Probe Troubleshooting to make measurements on A14J18 pins 5 13 and 14 These voltages ar...

Page 408: ... Third Converter 1 Perform the IF Input Amplitude Accuracy performance test in the HP 8560A Installation and Verification Manual if Option 002 is not present This exercises most of the third converter 2 If the performance test fails or Option 002 is present perform the External Mixer Amplitude adjustment in Chapter 2 of this manual 3 If adjustment cannot be made disconnect W35 from A15J801 4 On th...

Page 409: ...s Compensation Amplifiers The 2nd IF Distribution switches between two possible 2nd IF inputs the internally generated 2nd IF or the external mixing IF INPUT non option 002 analyzers only A variable dc bias can be applied to the IF INPUT for external mixers which require such bias The selected input is fed to the A15Al 2nd IF Amplifier This is a microcircuit consisting of two stages of gain and tw...

Page 410: ...eir minimum values 11 Connect the other spectrum analyzer to A15J601 and measure the 10 7 MHz IF signal level The signal should measure approximately 10 dBm If the signal level is incorrect continue with step 13 12 Enter 0 into the HP 8560A Flatness Data The signal level at A15J601 should measure less than 32 dBm This sets the gain of Flatness Compensation Amplifiers to a minimum attenuators to ma...

Page 411: ... 3 On the HP 8560A press m and INTERNAL MIXER The voltage on the DVM should measure approximately 0 Vdc TTL low 4 Connect the DVM s positive lead to A15J901 pin 13 LSID The signal measured turns on the SIG ID oscillator 5 On the HP 8560A press SIG ID ON ITRIG and SINGLE 6 Subsequent pushes of the SINGLE softkey should cause the signal measured on the DVM to toggle between TTL high and low levels 7...

Page 412: ...ias Diodes CR501 and CR502 should be forward biased disabling the 3rd LO Driver Amplifier 6 The voltage at the R622 R623 node should measure approximately 5 Vdc biasing Q604 on 7 If oscillator bias voltages are correct place a 100 R resistor across SAWR U602 pins 1 and 2 If the SAWR has failed this will provide the equivalent loss of a correctly functioning SAWR and the circuit will begin to oscil...

Page 413: ...according to the procedure in steps 2 through 4 If the signals are correct in EXTernal operation but not in INTernal operation the problem lies in the TCXO its voltage reference the TTL level generator or the A21 OCXO if Option 003 Check these sections as follows On the HP 8560A press 10 MHz INT Check U305 pin 3 for approximately 12 Vdc Check for a 10 MHz sine wave 21 Vp p at U302 pin 2 non option...

Page 414: ...Graph C 1 1 1 0 0 V div 1 0 0 v 5 0 0 ns div 0 0 0 0 s 1 Ghan 1 1 A15J302 Figure 11 4 10 MHz TTL Reference at U303 Pin 5 II 16 RF Section ...

Page 415: ...ate Bias Voltage XMX External Mixer lZV EXT MIX 12V INT MIX SID SIG ID Oscillator ON 12V SIG ID OFF 8V SIG ID ON PIN DIODE SWITCH PIN Diode Switch Control For 2ND Conv IF Output RFGAIN Voltage to Control Gain of Flatness Comp Amps RFGAIN 1 and RFGAIN 2 Currents to Drive PIN Diodes in Flatness Comp Amps LlOdBA L20dBB LZOdBC L20dBD Control Lines to Set Attenuator Sections A B C and D to Attenuate Po...

Page 416: ...rence from the Al5 RF Assembly The upconverter also contains a filter to pass only the 782 14 MHz upper sideband Pentupler The pentupler multiplies the 782 14 MHz signal by five to generate 3 9107 GHz the spectrum analyzer s 1st IF A dual cavity band pass filter centered at 3 9107 GHz eliminates all unwanted multiples of 782 14 MHz Modulator The output of the Pentupler is passed through a Modulato...

Page 417: ...on and Verification Manual for more information on this specification It is normal for the TG to be unleveled at frequencies below 300 kHz If the TG output is unleveled and the start frequency of the TG is below 300 kHz ERR 901 TGFrqLmt TG Frequency Limit and ERR 900 TG UNLVL may be displayed refer to General Troubleshooting for information on checking for multiple error messages If the start freq...

Page 418: ...quency or power level at which the output is unleveled indicates a problem on the Al4 Frequency Control Assembly Excessive Residual FM Either the tracking oscillator or the ALC circuitry could be responsible for excessive residual FM The residual FM should be measured on another spectrum analyzer such as an HP 8566A B or HP 8568A B using slope detection with the HP 8560A set to zero span Proceed a...

Page 419: ... of tolerance power levels is close to the frequencies at which the output is unleveled suspect AlO If the power level at W43 is also out of tolerance suspect either the A7 LODA or the All YTO Refer to Synthesizer Section Troubleshooting 3 Check all coax cables especially semi rigid cables A fault in one of these cables can cause a very high Q power hole Vernier Accuracy Out of Tolerance Vernier a...

Page 420: ... harmonic content than the tracking generator output For the purposes of this check it is the variation in harmonic content versus frequency which is important If the variation of the harmonic level of the 1st LO versus frequency tracks the harmonic level variation of the tracking generator output repeat this step while measuring the 1st LO signal at the end of W43 nearest AlO If there is little v...

Page 421: ...curacy Out of Tolerance above No Power Output The A10 requires power supplies a 1st LO signal and a 600 MHz drive signal in order to provide power output 1 Check power supplies on A14J13 and AlOJl Refer to the Al4 Frequency Control Assembly schematic 2 Verify that the voltage at A14J17 pin 14 is greater than 14 Vdc If the voltage is not greater than 14 Vdc troubleshoot A14 3 Check that ALC EXT mea...

Page 422: ...n the Tracking Oscillator Range Adjustment procedure using a spectrum analyzer such as an HP 8566A B in place of the frequency counter Try to adjust AlOC3 until a signal is displayed on the HP 8566A B If adjusting AlOC3 does not start the tracking oscillator functioning the A10 Tracking Generator is suspect 11 24 RF Section ...

Page 423: ......

Page 424: ... and A6Al High Voltage Assemblies contain lethal 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 assemblies Failure to follow this precaution can represent a shock hazard which may result in personal injury Warning The voltage potential at A6AlW3 is 9 kV If the cable must be disc...

Page 425: ... _r F L 4 WI ILH I F A N A 6 OWER SUPPLi 1 2 6 4SSEMBLY 110 220 VOLTAGE SELECTOR O N R E A R P A N E L i 28 1 5 Wl 15 5 19v C R T S U P P L Y 1 5 v __ 15v __ it 1ov 4 H V SHUTDOWNt 5V H V O N H I G H V O L T A G E MODULE AbAlW3 POWER SUPPLY I N D ICATOR LEDS 4 2 IONTROLLER GENERATORS I I Al8Vl C R T S K 1 1 2 0 Figure 12 l Simplified Section Block Diagram 12 2 Display Power Supply Section ...

Page 426: ...0 9 42 9 9 10 12 13 14 15 16 17 18 19 20 21 12 39 12 12 38 14 37 15 36 16 35 17 34 18 33 19 32 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 29 23 23 28 24 24 27 2j 25 26 26 26 25 27 27 24 28 28 23 29 29 22 30 30 21 31 31 20 32 32 19 33 33 18 34 34 17 35 35 16 36 36 15 37 37 14 38 38 13 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 23 24 25 26 27 28 29 30 20 19...

Page 427: ...Regulator Dead Power Supply steps 22 23 Check Buck Regulator Control Circuitry Dead Power Supply steps 11 21 Check High Voltage Supplies High Voltage Supplies Check Input Rectifier Dead Power Supply steps 6 7 Check Intensity Adjustments Intensity Problems steps l 4 Check Kick Start Bias Circuitry Dead Power Supply steps 8 10 Check Low Voltage Supplies Low Voltage Supplies Troubleshooting Using the...

Page 428: ...display 1 Connect the printer to the HP 8560A and set the printer s address to the value required by the TAM This is usually 1 2 All of the power supply indicator LEDs along the edge of the A2 Controller Assembly should be lit 3 The rear panel CRT llO VDC ON indicator should also be lit 4 Connect the TAM s probe cable to A2Jll 5 Press m SOFT KEY 3 a SOFT KEY l The top soft key is l 6 The yellow LE...

Page 429: ...cribed High Voltage Supplies in this chapter Blank Display 1 If the LED above the front panel LINE switch is lit most of the A6 Power Supply is functioning properly 2 Carefully check the voltages on the front panel PROBE POWER jack Be careful to avoid shorting the pins together See Figure 12 3 3 Check that the fan is operating If the PROBE POWER voltages are correct and the fan is turning the A6 P...

Page 430: ...ay Distortion The HP 8560A uses a vector display The graticule lines traces and characters are composed of a series of straight lines vectors placed end to end If the vectors do not begin and end at the proper points the display appears distorted but in focus Symptoms range from characters appearing elongated and graticule lines not meeting squarely to an entirely unreadable display 1 Use the CRT ...

Page 431: ...y the signals at TPll TP14 TP12 and TP13 10 If signals are correct and cables to CRT are good suspect the CRT Focus Problems Focus problems may be due to a defective A18Vl CRT improper adjustments improper connections or absence of high voltage The A2 Controller s focus control circuitry has a very minor effect on the overall focus Although A17 s Grid Level Shifter function block D is the leading ...

Page 432: ...TP9 by 25 V 14 Set front panel INTEN to minimum and Z FOCUS fully counterclockwise and A17R26 X FOCUS to fully counterclockwise Verify that the peak to peak voltage at TP9 is about 40 Vp p due to X Dynamic Focus circuit 15 If circuit operation seems correct A18Vl CRT is probably at fault Intensity Problems Intensity problems or absence of display can be due to the Al7 assembly s Intensity Amplifie...

Page 433: ...injury Note The following measurements should be made with a high voltage probe such as the HP 34111A When using the high voltage probe connect the ground lead securely to the HP 8560A chassis 7 Carefully measure the grid voltage at A17J7 pin 6 and the cathode voltage at A17J7 pin 4 The display will work with a cathode voltage of 2450 V f250 V provided the grid voltage A17J7 pin 6 is 30 to 100 V m...

Page 434: ...RT with caution Failure to properly discharge A6AlW3 may result in severe electrical shock to personnel and damage to the instrument See Chapter 3 Procedure 2 Warning Always use an isolation transformer when troubleshooting either the A6 Power Supply or the A6Al HV Module When using an isolation transformer connect a jumper between AGTPlOl and A6TP301 This connects the circuit common to earth grou...

Page 435: ...7 nearest C209 18 If the current draw exceeds approximately 50 mA suspect a short in the Buck Regulator Control circuitry or a shorted CR201 19 Check TP204 for an 80 kHz sawtooth 4 Vp p 20 Check TP203 and TP207 for 40 kHz square 12 Vp p If the waveforms at either TP203 or TP207 are bad one of the FETs in the DC DC Converter is probably defective 21 Check TP105 and TP106 for a 12 Vp p sawtooth wave...

Page 436: ... down by a fault condition The Kick Start and Bias circuits provide power for the control circuitry during power up The Kick Start circuitry is an RC oscillator which emits a 200 ms pulse every 1 5 seconds These pulses switch current from the Input Rectifier through Q201 to charge C201 When the power supply is up a winding on T103 provides power to the control circuitry This voltage is high enough...

Page 437: ...e If necessary perform the High Voltage Power Supply adjustment in Chapter 2 5 If the DVM does not read approximately l 110 Vdc measure the voltage on A6U401 pin 10 This is the HV SHUT DOWN signal and should be near 5 Vdc 6 If HV SHUT DOWN is low suspect a bad connection along W8 between the A6 Power Supply and the 17 CRT Driver 7 If HV SHUT DOWN is correct connect an oscilloscope to A6TP402 Conne...

Page 438: ...k pin U401 pin 8 for a sawtooth signal The sawtooth should be flat topped and about 5 Vp p at a frequency of about 30 kHz 6 If the sawtooth is not flat topped suspect U402A and its associated circuitry 7 If the sawtooth is correct check the base of Q401 for 30 kHz pulses 8 If the duty cycle is high but there is no llO Vdc suspect the bridge rectifier CR401 through CR404 Blanking Signal 1 Connect a...

Page 439: ...ripple by more than 10 dB U202C and its associated circuitry permit the power supply to start up at low line voltages at low temperatures At low line voltages U202C will draw charge away from C206 through R205 This allows the Buck Regulator to turn on and draw current through the thermistors in the Input Rectifier This warms up the thermistors thereby decreasing their resistance and increasing the...

Page 440: ...ch tells the microprocessor that the supplies are up and stable PWR UP will go high when the 5 Vdc supply exceeds 4 99 Vdc PWR UP will go low when this voltage drops below t4 895 Vdc Once PWR UP is set low it will stay low for at least 50 ms before going high even if the 5 Vdc supply exceeds i 4 99 Vdc before 50 ms have elapsed Display Power Supply Section 12 17 ...

Page 441: ...12 18 Display Power Supply Section ...

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Page 444: ...w 3207A Table A 3 lists documented RF board assemblies shipped with HP 8560A Spectrum Analyzers serial prefixed below 3029A Updated or replacement CLIPS may be ordered through your local Hewlett Packard Sales or Service office using the CLIP part numbers provided in the following tables A complete set of the latest version of CLIPS can be ordered using HP Part Number 5958 7187 CLIPS are packaged i...

Page 445: ...009 08560 90069 3121A through 3204A 08560 60013 08560 90070 3207A and above 08562 60144 O 3560 90072 A4 Log Amplifier CAL OSC 3207A and above 08560 60022t 08560 90071 A5 IF Filter 2913A through 2949A 2950A through 3204A 3207A and above 08560 60011 08560 90025 08560 60029 08560 90026 08560 60061 08560 90077 A6 Power Supply 2913A and above 08562 60094t 08562 90111 A14 Frequency Control 2913A through...

Page 446: ...3 3029A through 3115A 3120A through 3133A 3137A through 3216A 3217A and above 08562 60117 08562 90113 08562 60145 08562 90185 08562 60152 08562 90184 08562 60169t 08562 90194 Al7 CRT Driver 2913A through 3040A 3049A through 3137A 3146A through 3218A 3221A and above 08562 60039 08562 90114 08562 60112 08562 90117 08562 60165 08562 90187 08562 60166 08562 90193 A19 HP IB 2913A and above 08562 60042 ...

Page 447: ...ly Instrument Assembly CLIP Part Number Serial Prefix Part Number A4 Log Amplifier 2913A through 2948A 08560 60010 08560 90022 2929A 08560 60033 08560 90023 2950A through 3204A 08560 60035 08560 90024 Al6 CAL OSC 2913A through 3204A 08560 60014 08560 90027 A 4 Component Level Information Packets ...

Page 448: ...30 3017A through 3027A 08560 60037 08560 90031 Al5 RF Board Option 012 2913A through 3009A 08560 60025 08560 90032 3017A through 3027A 08560 60038 08560 90033 Al5 RF Board Option 003 2913A through 3009A 08562 60101 08562 90102 3017A through 3027A 08562 60121 08562 90106 Al5 RF Board Option 013 2913A through 3009A 08562 60102 08562 90103 3017A through 3027A 08562 60125 08562 90108 A15 RF Board Opti...

Page 449: ...A 6 Component Level Information Packets ...

Page 450: ......

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