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HP 8719ES, Service Manual

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14-2

Service Guide

Assembly Replacement and Post-Repair Procedures

HP 8719ET/20ET/22ET

Information on This Chapter

HP 8719ES/20ES/22ES

RF Network Analyzers

Information on This Chapter

This chapter contains procedures for removing and replacing the major assemblies of the
HP 8719ET/ES, HP 8720ET/ES, and HP 8722ET/ES network analyzers. A table showing
the corresponding post-repair procedures for each replaced assembly is located in the

“Post-Repair Procedures” on page 14-35

.

Summary of Contents for 8719ES

Page 1: ...Service Guide HP 8719ET 20ET 22ET HP 8719ES 20ES 22ES Network Analyzers HP Part Number 08720 90397 Printed in USA September 1999 Copyright 1999 Hewlett Packard Company ...

Page 2: ...specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology to the extent allowed by the Institute s calibration facility and to the calibration facilities of other International Standards Organization members Regulatory and Warranty Information The regu...

Page 3: ...ond a warning note until the indicated conditions are fully understood and met CAUTION Caution denotes a hazard It calls attention to a procedure that if not correctly performed or adhered to would result in damage to or destruction of the instrument Do not proceed beyond a caution sign until the indicated conditions are fully understood and met How to Use This Guide This guide uses the following ...

Page 4: ...finitions The Programmer s Guide provides general HP IB programming information a command reference and example programs The Programmer s Guide contains a CD ROM with example programs The CD ROM provides the Installation and Quick Start Guide the User s Guide the Reference Guide and the Programmer s Guide in PDF format for viewing or printing from a PC The Service Guide provides information on cal...

Page 5: ... Option W51 1 9 Option W32 1 9 Option W52 1 9 Option W34 1 9 Option W54 1 10 2 System Verification and Performance Tests Sections in This Chapter 2 2 How to Test the Performance of Your Analyzer 2 3 ANSI NCSL Z540 1 1994 Verification 2 3 Non ANSI NCSL Z540 1 1994 Verification 2 3 Instrument Verification Cycle 2 4 Preliminary Tests 2 6 Required Equipment and Tools 2 6 Check the Temperature and Humi...

Page 6: ...utput Power Adjustments 3 17 Preparing the Instrument 3 17 Setting the Main Power DAC to Preset Values 3 18 Setting the Potentiometers to the Minimum Levels 3 19 Adjusting the Mid Band Power 3 20 Adjusting the Low Band Power 3 21 Adjusting the High Band Power Agilent 8722ET ES 3 21 Fine Tuning the Flatness 3 22 Power Linearity Adjustment 3 24 Preparatory Steps 3 24 In Case of Difficulty 3 29 Blank...

Page 7: ...r Printer 4 11 If Using an External Disk Drive 4 11 Troubleshooting Systems with Multiple Peripherals 4 12 Troubleshooting Systems with Controllers 4 12 Step 4 Faulty Group Isolation 4 13 Power Supply Check 4 14 Check the Rear Panel LEDs 4 14 Check the Post Regulator A8 LEDs 4 14 Digital Control Check 4 15 Observe the Power Up Sequence 4 15 Verify Internal Tests Passed 4 16 Source Check 4 17 Phase...

Page 8: ...ture 5 12 Inspect the Motherboard 5 12 If the Green LEDs of the Post Regulator A8 Are Not All ON 5 13 Maintain A15W1 Cable Connection 5 13 Check the Post Regulator A8 Fuses and Voltages 5 13 Remove the Assemblies 5 14 Briefly Disable the Shutdown Circuitry 5 15 Inspect the Motherboard 5 16 Error Messages 5 17 Check the Fuses and Isolate A8 5 17 Fan Troubleshooting 5 18 Fan Speeds 5 18 Check the Fa...

Page 9: ...hase Lock Problems 7 8 Swap IF Output Cables to Check R Sampler Assembly A64 7 9 Check Open Loop Power 7 11 Check Reference Board A12 7 13 Check Fractional N Digital A14 with ABUS 7 14 ChecktheFractional NAnalog A13 andFractional NDigital A14 withaSpectrumAnalyzer 7 15 Check the VCO A14 Range with Oscilloscope 7 16 Substituting Tuning Voltages to Check the VCO 7 17 Divide by N A14 Circuit Check 7 ...

Page 10: ... 10 19 Service Modes More Menu 10 21 Analog Bus on OFF 10 22 Description of the Analog Bus ANAB 10 22 The Main ADC 10 22 The Frequency Counter 10 22 Analog In Menu 10 23 Analog Bus Nodes 10 24 PEEK POKE Menu 10 31 Firmware Revision Softkey 10 32 HP IB Service Mnemonic Definitions 10 33 Invoking Tests Remotely 10 33 Analog Bus Codes 10 34 Service Related Error Messages in Alphabetical Order 10 35 1...

Page 11: ...ock Comparing Phase and Frequency 12 15 Tuning the YIG Oscillator 12 15 Phase Locked Sweep 12 15 A12 Reference The Crystal Reference Frequencies 12 16 Source Block The YIG Oscillator Signals 12 16 ALC Automatic Leveling Control 12 18 Signal Separation ES Models Only 12 19 A58 M A D S Modulator Amplifier Detector Splitter 12 19 A58 M A D and A74 Switch Splitter Option 400 Only 12 20 A69 Step Attenu...

Page 12: ...13 86 Miscellaneous Part Numbers 13 87 14 Assembly Replacement and Post Repair Procedures Information on This Chapter 14 2 Assembly Replacement Sequence 14 3 Procedures in This Chapter 14 4 Replacing the Line Fuse 14 5 Tools Required 14 5 Removal 14 5 Replacement 14 5 Removing the Covers 14 6 Tools Required 14 6 Removing the top cover 14 6 Removing the side covers 14 6 Removing the bottom cover 14...

Page 13: ... Replacement 14 24 Removing the A19 Graphics Processor Assembly 14 26 Tools Required 14 26 Removal 14 26 Replacement 14 26 Removing the A3 Disk Drive Assembly 14 28 Tools Required 14 28 Removal 14 28 Replacement 14 28 Removing the A62 A63 Test Port Couplers and LED Board Assemblies 14 30 Tools Required 14 30 Removal 14 30 Replacement 14 30 Removing the A26 High Stability Frequency Reference Option...

Page 14: ...thium Battery Disposal 15 5 General Safety Considerations 15 6 Safety Earth Ground 15 6 Before Applying Power 15 6 Servicing 15 6 Compliance with German FTZ Emissions Requirements 15 8 Compliance with German Noise Requirements 15 8 Declaration of Conformity 15 9 ...

Page 15: ...14 1 14 Assembly Replacement and Post Repair Procedures ...

Page 16: ...RF Network Analyzers Information on This Chapter This chapter contains procedures for removing and replacing the major assemblies of the HP 8719ET ES HP 8720ET ES and HP 8722ET ES network analyzers A table showing the corresponding post repair procedures for each replaced assembly is located in the Post Repair Procedures on page 14 35 ...

Page 17: ...stments Refer to Chapter 3 Adjustments and Correction Constants Step 5 Perform the necessary performance tests Refer to Chapter 2 System Verification and Performance Tests WARNING These servicing instructions are for use by qualified personnel only To avoid electrical shock do not perform any servicing unless you are qualified to do so WARNING The opening of covers or removal of parts is likely to...

Page 18: ...embly on page 14 14 Removing the Rear Panel Interface Board Assembly on page 14 16 Removing the Source Assemblies on page 14 18 M A D S A58 YIG 1 A54 YIG 2 A55 Cavity Oscillator A57 Removing the A7 CPU Board Assembly on page 14 20 Removing the A7BT1 Battery on page 14 22 Removing the A15 Preregulator Assembly on page 14 24 Removing the A19 Graphics Processor Assembly on page 14 26 Removing the A3 ...

Page 19: ...For continued protection against fire hazard replace fuse only with same type and rating 3 A 250 V F The use of other fuses or materials is prohibited 1 Disconnect the power cord 2 Use a small slot screwdriver to pry open the fuse holder 3 Replace the blown fuse For 115V operation use a 5A 125V TD fuse HP part number 2110 1059 For 230V operation use a 4A 250V TD fuse HP part number 2110 0734 Repla...

Page 20: ...ing the attaching screws item 2 2 Loosen the top cover screw item 3 3 Slide cover off Removing the side covers 1 Remove the top cover 2 Remove the lower rear foot item 4 that corresponds to the side cover you want to remove by loosening the attaching screw item 5 3 Remove the handle assembly item 6 by loosening the attaching screws item 7 4 Slide cover off Removing the bottom cover 1 Remove both l...

Page 21: ...Service Guide 14 7 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the Covers RF Network Analyzers ...

Page 22: ...e than one RF cable on the front panel 4 Remove the Line button item 3 5 Remove the trim strips item 4 from the top edge of the front frame by prying under the strip with a small slot screwdriver 6 Remove the 7 screws item 5 from the top and bottom edges of the frame a Remove all 4 flathead screws from the top and the 3 flathead screws from the bottom NOTE The 3 bottom screws are on both ends and ...

Page 23: ...Service Guide 14 9 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the Front Panel Assembly RF Network Analyzers ...

Page 24: ...1 Remove the front panel assembly from the analyzer refer to Removing the Front Panel Assembly on page 14 8 2 Remove the 4 ribbon cables item 1 through 4 from the front panel interface board 3 Remove the 4 screws item 5 that attach the interface board NOTE If the front panel interface board is to be replaced install the new board at this point and reverse steps 1 through 3 to complete the process ...

Page 25: ...Service Guide 14 11 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the Front Panel Interface and Keypad Assemblies RF Network Analyzers ...

Page 26: ...10 in lb Removal 1 Remove the front panel assembly A1 refer to Removing the Front Panel Assembly on page 14 8 2 Remove the 2 ribbon cables between Item 1 the inverter assembly A20 and the front panel interface board A2 Item 2 the inverter assembly A20 and the display assembly A18 3 Remove the 3 screws item 3 that attach the display cover to the front panel 4 Lift the display from the front panel a...

Page 27: ...Service Guide 14 13 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the Display Lamp and Assembly RF Network Analyzers ...

Page 28: ...he connectors attaching hardware item 5 5 Remove the hardware item 6 that attaches the RS 232 connector to the rear panel 6 Remove the 4 screws item 7 that attach the interface bracket to the rear panel 7 Remove the 6 screws item 8 and item 9 that attach the preregulator to the rear panel 8 Remove the 8 screws item 10 from the rear frame 4 from the top edge and 4 from the bottom edge 9 Remove the ...

Page 29: ...Service Guide 14 15 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the Rear Panel Assembly RF Network Analyzers ...

Page 30: ... jumper item 1 3 Remove the hardware that attaches the 9 BNC connectors to the rear panel item 2 4 Remove the hardware that attaches the test set I O interconnect to the rear panel item 3 5 Remove the rear panel from the analyzer refer to Removing the Rear Panel Assembly in this chapter 6 If the analyzer has option 1D5 disconnect the cable item 4 from the rear panel interface board 7 Disconnect th...

Page 31: ...Service Guide 14 17 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the Rear Panel Interface Board Assembly RF Network Analyzers ...

Page 32: ... source module to the analyzer 7 Disconnect the cables item 1 and item 2 for all but Option 400 from the M A D S 8 Remove the 4 screws item 5 and item 6 from the source module bracket Remove the bracket 9 Lift the source module out of the analyzer 10 Remove a screw item 7 from the back of the oscillator 11 Disconnect attaching RF cables A59 Source Interface Board Removal 12 Remove the 3 screws ite...

Page 33: ...rse the order of the removal procedure NOTE When replacing the A59 source interface board push the board evenly on all the microcircuit pins Check all the pin sockets from the back of the A59 board to ensure that all of the pins are inserted For HP 8722ET ES models you may need an eye glass to inspect the shallow pins of the S1 high band switch When replacing the source module into the analyzer pu...

Page 34: ...nd bottom cover refer to Removing the Covers on page 14 6 3 Remove the 4 screws item 1 on the rear panel 4 Turn the analyzer over and remove the screw item 2 that secures the CPU board to the deck 5 Disconnect the ribbon cable item 3 6 Disconnect the ribbon cable item 4 from the CPU board 7 Slide the board towards the front of the instrument so that it disconnects from the 3 standoffs item 5 8 Dis...

Page 35: ...Service Guide 14 21 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the A7 CPU Board Assembly RF Network Analyzers ...

Page 36: ...emoving the A7 CPU Board Assembly on page 14 20 2 Unsolder and remove A7BT1 from the A7 CPU board WARNING Battery A7BT1 contains lithium The battery may explode if it is incorrectly replaced Do not incinerate or puncture this battery Either dispose of the discharged battery according to manufacturer s instructions or collect as small chemical waste Replacement 1 Make sure the new battery is insert...

Page 37: ...Service Guide 14 23 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the A7BT1 Battery RF Network Analyzers ...

Page 38: ...panel refer to Removing the Rear Panel Assembly on page 14 14 2 Disconnect the wire bundles item 1 item 2 from the analyzer 3 Remove the preregulator A15 from the frame Replacement 1 Reverse the order of the removal procedure NOTE When reinstalling the preregulator A15 make sure the 3 grommets on the wiring bundles are seated in the slots on the back side of the preregulator and also in the slot i...

Page 39: ...Service Guide 14 25 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the A15 Preregulator Assembly RF Network Analyzers ...

Page 40: ...RX screwdriver T 15 TORX screwdriver ESD electrostatic discharge grounding wrist strap Removal 1 Disconnect the power cord and remove the front panel refer to Removing the Front Panel Assembly on page 14 8 2 Disconnect the 2 ribbon cables item 1 and item 2 3 Remove the 2 screws item 3 that attach the GSP to the front of the analyzer 4 Pull the GSP A19 board item 4 out of the analyzer Replacement 1...

Page 41: ...Service Guide 14 27 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the A19 Graphics Processor Assembly RF Network Analyzers ...

Page 42: ...Removal 1 Disconnect the power cord and remove the bottom and left side covers refer to Removing the Covers on page 14 6 2 Remove the front panel refer to Removing the Front Panel Assembly on page 14 8 3 Turn the instrument upside down and disconnect the ribbon cable item 1 from the CPU board 4 Remove the 4 screws item 2 that secure the disk drive bracket to the side of the frame 5 Slide the disk ...

Page 43: ...Service Guide 14 29 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the A3 Disk Drive Assembly RF Network Analyzers ...

Page 44: ...Removing the Covers on page 14 6 2 Remove the front panel refer to Removing the Front Panel Assembly on page 14 8 3 Reaching the connections from the bottom of the analyzer disconnect the 4 RF cables attached to the couplers 2 from the back of the couplers and 2 from between the couplers 4 Remove the 6 screws item 1 from the bottom edge of the front panel frame 5 Remove the screw item 2 from the r...

Page 45: ...Service Guide 14 31 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the A62 A63 Test Port Couplers and LED Board Assemblies RF Network Analyzers ...

Page 46: ...30 from the high stability frequency reference board A26 3 Remove the BNC connector nut and washer from the 10 MHz PRECISION REFERENCE connector item 1 on the rear panel 4 Remove the screw item 4 that attaches the 1D5 assembly to the rear panel 5 Remove the screw item 2 that secures the high stability frequency reference board A26 to the bracket 6 Slide the board out of the bracket Be careful not ...

Page 47: ...Service Guide 14 33 HP 8719ET 20ET 22ET Assembly Replacement and Post Repair Procedures HP 8719ES 20ES 22ES Removing the A26 High Stability Frequency Reference Option 1D5 Assembly RF Network Analyzers ...

Page 48: ...screwdriver ESD electrostatic discharge grounding wrist strap Removal 1 Remove the rear panel refer to Removing the Rear Panel Assembly on page 14 14 2 Remove the 4 screws item 1 that secure the fan and fan cover to the rear panel Replacement 1 Reverse the order of the removal procedure NOTE The fan should be installed so that the direction of the air flow is away from the instrument There is an a...

Page 49: ...ulse Generator Raw Offset CC Sampler Calibration CC Test 51 Frequency Accuracy Performance Test Dynamic Range Performance Test A8 Post Regulator None Internal Test 0 Check A8 test point voltages A7 CPU a a If you have an EEPROM backup disk available you only need to perform the first three tests listed A7 Switch Positions Load Firmware CC Retrieval Serial Number CC Test 49 Option Number CC Test 50...

Page 50: ... Power Adjustments Power Linearity Adjustments Frequency Accuracy Performance Test Level Accuracy Performance Test Source Linearity Performance Test A54 YIG2 20 40 GHz HP 8722ET ES Source Pretune CC Test 43 Output Power Adjustments Power Linearity Adjustments Frequency Accuracy Performance Test Level Accuracy Performance Test Source Linearity Performance Test A55 YIG1 2 4 20 GHz Source Pretune CC ...

Page 51: ...uracy Performance Test Dynamic Range Performance Test A69 55 dB Step Attenuator Raw Offset CC Sampler Cal CC Frequency Accuracy Performance Test A70 Step Attenuator Output Power Adjustments Power Linearity Adjustments Level Accuracy Performance Test Source Linearity Performance Test A71 Step Attenuator Output Power Adjustments Power Linearity Adjustments Level Accuracy Performance Test Source Line...

Page 52: ...14 38 Service Guide Assembly Replacement and Post Repair Procedures HP 8719ET 20ET 22ET Post Repair Procedures HP 8719ES 20ES 22ES RF Network Analyzers ...

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