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Agilent Technologies 83621A User's Manual

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2. Adjustments Required Troubleshooting Foldout Block 1 Perform Adjustments Located in front of the Special Cases tab Adjustments successful 2 A23 10 MHz Reference Troubleshooting RF 000 RF Troubleshooting NN ee T TZZ ZTZV Z ZJ KVT HI Message Displayed on Synthesizer RF RF RF RF RF RF RF YO Amplifier Bias LOBAND Tuning Voltage LOBAND Locked Check Amp Multiplier Amp Filter Doubler LOBAND Output Level Go to Paragraph RF 100 RF 300 RF 400 RF 500 RF 600 RF 700 RF 800 RF Troubleshooting 1 RF 100 2 RF Troubleshooting Following the disassembly and replacement procedures lift the RF deck up into the service position Check the ribbon cable that connects the YO A26 to the RF interface board A20 If it is loose then reseat the cable Correct any other obvious faults Perform the following test l Press PRESET PRESET SERVICE 3 Press 266 Es es 4 Select D If the test fails go to RF 2690 Otherwise go to the oa Foldout block 1 located just prior to the Special Cases tab pen ig 2 ie target atten prole et x R gt A RF 300 100MHz 8 Go To A7 9000 Continue RF 301 X gt 250mV DC Continue Go To RE 303 Disconnect W20 From A J Disconnect W22 From A10J6 A10J6 RF 405 ase ILLGSCOPE SYNTHESIZER NOTHERBO
3. After you repair the opens go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 12 A19 Rear Panel Interface Troubleshooting A19 1325 A19 1326 A19 1327 15VDC SYNTHESIZER HOTHERSOARD Ea Ped Er errr mms Peri eanugnhkeRads JS caunas Y ai 4090550024200 3 FRONT OF INSTRUMENT Go To A16 9000 Continue There is an open on the motherboard between A22J8 4 and A16J1 30 31 70 or 71 Verify this with an ohmmeter Is jumpering an acceptable repair ea Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A19 Rear Panel Interface Troubleshooting 13 A19 1330 A19 1331 A19 1332 aupastos amp FRONT GF INSTRUMENT Go To A16 9000 Continue There is an open on the motherboard between A22J8 8 and A16J1 18 19 58 or 59 Verify this with an ohmmeter Is jumpering an acceptable repair ag Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 14 A19 Rear Panel Interface Troubleshooting A19 8000 Perform the following 1 Turn the synthesizer off 2 Unplug the line power cord Salt 3 Remove the 8 screws that hold the rear panel 4 Lower the rear panel there is no need to disconnect it completely 5 Completely remove W31 W31 connects A19 to the
4. Reed ten e A ee e nedare Perro M Fractional N Troubleshooting A4 000 Message Displayed on Synthesizer Go to Paragraph A4 Read Buffers A4 100 A4 3 25V Supply A4 200 A4 Tuning Range A4 300 A4 FNGO Control A4 400 A4 D REF Supply A4 9000 ia A4 FN Chip Registers A4 9000 o A4 2 2V Supply A4 9000 A4 Sweep Test A4 9000 AA Switching Speed A4 9000 A4 Monotonicity A4 9000 A4 Fractional N Troubleshooting 1 FOSA FOSO 2 MENE ASSEN END Go To 44 1300 Continue A4 101 Go To A4 1305 Continue 2 A4 Fractional N Troubleshooting A4 102 Loop self test 232 1 3 Press 232 ENTER a ae eg TTT a re a kv re reiser Bees pP 8 S g Go To A4 1310 Continue A4 103 Loop self test 231 3 Press 231 4 Select Lao A4 Fractional N Troubleshooting 3 Go To A4 1315 Continue A4 104 Go To A4 1320 Continue 4 A4 Fractional N Troubleshooting A4 105 Go To A4 1325 Go To A4 9000 A4 Fractional N Troubleshooting 5 FRONT OF INSTRUMENT Go To A4 1330 Continue A4 201 pHeoRaeoaM gt I CN sanan a o LOUOEBARTORCARA i Go To A4 1300 Go To A4 9000 6 A4 Fractional N Troubleshooting A4 300 The pulse width is 10 to 20 ns The frequency is 125 kHz The oscilloscope must present a 502 load Do not use a high impedance probe The combination of low frequency and narrow pulse width makes this a very di
5. 2 Change the 20 dB attenuator to the filter FL2 3 Delete all references to the attenuator ILT 2112 1 Change A38 to A25 2 Change RF 3890 to RF 2590 ILT 2120 1 Change A38 to A25 2 Change RF 3890 to RF 2590 HP 8366 Change B 2 3 Troubleshooting ILT 2130 Change AM modulator RF 3890 to mod splitter RF 2590 ILT 2255 Change step 3 to read The bridge detector in the HP 83621A 31A or the coupler detector in the HP 83651A RF 3090 ILT 2256 1 In the second sentence change bridge detector to coupler detector 2 Change step 5 to read The bridge detector in the HP 83621A 31A or the coupler detector in the HP 83651A RF 3090 ILT 2257 1 Change step 2 to read The amplifier multiplier RF 2890 2 Change step 5 to read The bridge detector in the HP 83621A 31A or the coupler detector in the HP 83651A RF 3090 ILT 2620 In the table change RF 3890 AM modulator to RF 2590 mod splitter 1LT 2650 1 Delete all references to A38 2 In the table change AM modulator A38 to mod splitter A25 2 4 Change B HP 8369 Troubleshooting A6 Troubleshooting 6 400 Section 1 For the power measurement a In step 7 set the synthesizer to 2 3 GHz b In step 8 sweep from 2 3 to 7 4 GHz c In step 8 verify that the power is greater than 22 dBm 2 For the frequency measurement a In step 1 set the synthesizer to
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7. External Leveling Spurious Signals Non Harmonics Single Sideband Phase Noise CW Frequency Accuracy y The most likely cause of line related spurs is EMI electromagnetic interference from other sources or from poor grounding EMI can occur as a result of 22 Instrument Level Troubleshooting ILT 2620 shielding degradation in the synthesizer due to damage or faulty reinstallation of the top or bottom covers or the braided shielding A faulty line filter FL1 can also cause spurs Recheck the measurement and set up for faulty grounds Check the synthesizer shielding Check the environment for unusually strong line currents close to the measurement If there is no likely external source replace FL1 After taking action go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab The problem can be caused by the A10 assembly ALC or a microcircuit Using the table below go to the indicated paragraphs Failing Frequency Go to Range Paragraph lt 2 GHz only A10 9000 ALC or RF 2490 low band SP OTTO Above and below 2 3 GHz A10 9000 ALC instrument Level Troubleshooting 23 ILT 2630 There are two types of non harmonic non line related spurious signals spurs w Crossing spurs These are usually caused by poor shielding or by interaction between the YO loop phase detector assembly A5 and the sampler assembly A6 Another caus
8. Reconnect W1 and W4 the cables connecting the front panel processor A3 to the display A21 Reconnect the instrument to ac line power Set the line power switch to ON Measure the previously failed voltage sg Go To A21 9000 Continue oH vi Set the line power switch to STANDBY Disconnect the instrument from ac line power Reconnect W5 the ribbon cable connecting the front panel processor A3 to the keyboard A1 Reconnect the instrument to ac line power Set the line power switch to ON Measure the previously failed voltage ag Go To A1 9000 Continue A16 A17 A18 Troubleshooting 93 A16 7034 The problem may be intermittent Go to Special Cases if you need additional assistance 94 A16 A17 A18 Troubleshooting A16 9000 Replace the A16 assembly Adjustments Required Troubleshooting Perforrn Foidout x Adjustments Block 1 I xLocated in front of the Special Cases tab Adjustrnents Successful A16 A17 A18 Troubleshooting 95 puros Besnsnacesnsnsententelet eluate ella Fol Pal end Poser lace AR eat ab eleb head Oe MeN Nene pen ae EEE EELE enrere emsav eege p gm mm mem ares u nesesrene rro opone A17 Rectifier Filter Replacement A17 000 If you think the problem with your instrument may originate on the A17 assembly go to Instrument Level Troubleshooting Oo
9. examine the YO loop for the cause of failure E 2 3 4 RF path from the directional coupler A39 to the sampler A6 YO sampler and YO phase detector adjustments Sampler YO A26 or mod splitter YO phase detector A5 or YO driver A13 Replace W14 Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab TIPO tet SYS 200 1 Check W33 A22J4 to A24J6 for poor connection or damage 2 Reseat the pulse assembly A9 3 Replace the pulse assembly A9 or the low band microcireuit A24 System Troubleshooting 7 SYS 300 1 Check all cabling and connections associated with the ALC A10 and low band A24 assemblies 2 Perform the low band A24 and ALC A10 adjustments 8 System Troubleshooting a a TT SYS 500 1 Check all cabling and connections associated with the ALC A10 and the AM modulator A38 2 Perform the ALC adjustments 3 Replace the AM modulator if it has not already been replaced 4 Replace the RF interface A20 5 Replace the ALC assembly A10 System Troubleshooting 9 SYS 600 10 System Troubleshooting For the HP 83651A only perform the following setup 1 Set the power switch to standby 2 Reconnect any disconnected cables 3 Disconnect W60 from the amplifier filter A29 as shown in the following figure Set the line power switch to ON Pa 5 Press ALC 6 Select 1 7 Press cw
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11. 28 to gt 11 dBm from 2 i to 7 GHz Press cw Press the up arrow increments frequency SYS 652 Repeat steps 1 through 5 until the CW frequency equals 26 5 GHz HP 83631A or 20 GHz HP 836214 if there is an unleveled condition at a specific frequency set that CW frequency and repeat steps 1 through 3 PONER METER Disconnect W57 From A38 Range From 28dBm to 11dBm FREQUENCY COUNTER Continue Go To RF 2890 Perform the following setup Set the power switch to standby Reconnect any disconnected cables Disconnect W49 from the A41 diode switch Connect a power meter to the output of A41 Turn power on Press cw Press the up arrow and increment the frequency from 2 to 7 GHz The power level should be gt 8 dBm Use a frequency counter to verify that the end points of the frequency range have been measured a Go To RF 4190 Go To RF 3890 y RUED Ne System Troubleshooting 17 SYS 653 SYS 654 18 System Troubleshooting Use a power meter to measure the power out the RF output connector Does power meet specifications in all bands Continue Go To RF 3090 Perform the following setup 1 Set the power switch to standby 2 Reconnect any disconnected cables 3 Remove W45 which connects to the input of the bridge detector 4 Turn power on 5 Press ED 7 Press cw 8 Press 2 GHz The following sequence exercises direct contr
12. 3 Press 4 Select 1 9 Select When comparing the oscilloscope waveform to the one shown the amplitude of the pulses is important the timing is not SYNTHESIZER MOTHERACARD FRONT OF INSTRUMENT Continue Go To A13 9000 A13 YO Driver Troubleshooting 11 A13 501 When comparing the oscilloscope waveform to the one shown the amplitude of the pulses is important the timing is not SYNTHESIZER NOTHERBOARD FRONT OF INSTRUMENT Go To A5 9000 Continue A13 502 There is an open on the motherboard between XA 1332 26 and XA5J2 26 Verify this with an ohmmeter Is jumpering the open an acceptable repair aq Go To A22 9006 Continue A13 503 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 12 A13 YO Driver Troubleshooting A13 600 Do the following 1 Set the line power switch to STANDBY 2 Disconnect the power cord 3 Measure the resistance of the YO tuning coil XA13J2 14 to XA13J2 60 should be gt 3502 to lt 652 SYNTHESIZER MOTHERBUARA FRONT OF INSTRUMENT Continue Go To A13 9000 A13 601 Was the resistance lt 350 I Go To A13 610 Continue A13 602 Do the following 1 Remove A13 2 Measure the resistance of the YO tuning coil XA13J2 14 to XA13J2 60 A13 YO Driver Troubleshooting 13 FRONT OF INSTRUMENT Continue Go To A13 9000 A13 603 Do the following 1 Disconnect W42 from A26J1 rib
13. 8 Press 2 GHz The following sequence exercises direct control over the power level with the ALC loop open Continue with the following sequence 1 Press POWER LEVEL 2 Use the rotary knob to set the ALC for maximum measured power 3 Using the rotary knob the measured RF power should be adjustable from lt 28 to gt 0 dBm 4 Press cw 5 Press 4 increments frequency Repeat steps 1 through 5 until the CW frequency equals 26 5 GHz If there is an unleveled condition at a specific frequency set that CW frequency and repeat steps 1 through 3 SYS 601 POMER METER Disconnect W60 From A29 SL Range From lt 28dBm to 0dBm M 2 0 to 26 5GHz LS Continue Go To SYS 605 Perform the following setup 1 Set the power switch to standby 2 Reconnect any disconnected cables 3 Remove W57 which connects the AM modulator A38 to the amplifier filter A29 Turn power on Select Press cw Press 2 GHz The following sequence exercises direct control over the power level with the ALC loop open Continue with the following sequence 1 Press POWER LEVEL 2 Use the rotary knob to set the ALC for maximum measured power 3 Using the rotary knob the measured RF power should be adjustable from lt 28 to gt 0 dBm 4 Press cw Press A increments frequency oF Com Ao GQ System Troubieshooting 11 Repeat steps 1 through 5 until the
14. i Fractionl N VCO Fractional N Reference and API Spurs Sweep Ramp YO Driver 10V Reference Sampler Assembly YO Loop Gain YO Driver Gain and Linearity YO Delay Modulator Offset and Gain Power Flatness ALC Power Level Accuracy Amplifier Multiplier Adjustments RF 2890 RF 2990 RF 2890 Amplifier Filter Adjustments Low Power SRD Bias Square Wave Symmetry 12 Instrument Level Troubleshooting ILT 2010 Set up for power measurement 1 Set the power switch to STANDBY 2 Remove the top and bottom covers 3 Turn the synthesizer power on 4 Press SERVICE 3 ver e Select 7 Press GHz 8 Using the rotary knob sweep the frequency from 2 to 7 GHz and verify that power is greater than 25 dBm gt Set up for frequency measurement 1 Press 2 GHz 2 Using A increment the frequency 3 The measured frequency equals the front panel indication 40 MHz 2 to 7 GHz b Fe Disconnect W54 i From FL2 M Manually sweep 2 to 7GHz e Continue Go To ILT 2015 Instrument Level Troubleshooting 13 ILT 2011 Set up for power measurement 1 Reconnect any disconnected cables 2 Put the RF deck in the service position a 3 Remove W51 which connects the directional coupler A39 to the 20 dB attenuator AT3 4 Press enal 5 Select asterisk on 6 Select 1 7 Press G Guz 8 Using the rotary knob
15. instrument History Introduction This manual documents the current production versions of the HP 83621A 31A 51A instruments As future versions of these instrument models are developed this manual will be modified to apply to those instruments Information provided in this chapter will then allow you to adapt this manual to the earlier versions All HP 83621A 31A synthesized sweepers with serial prefix numbers lower than 3103A are documented in a previous manual set Order either 83621 90007 or 83631 90007 ANA eae a iis Serial Prefix This manual applies to synthesized sweepers with a Numbers model number and serial number prefix listed on the title page see the serial number attached to the synthesizer s rear panel Figure 2 1 shows a typical serial number label A prefix four digits followed by a letter and a sequential suffix five digits unique to each instrument compose the serial number SS PREFIX SUFFIX INSTALLED OPT OPTIONS A n SA Figure 2 1 Typical Serial Number Label HP 8360 instrument History 2 1 Troubleshooting et How to Use instrument History 2 2 instrument History Find the serial prefix number of your instrument in the following tables make the changes that are listed for that prefix The actual changes with instructions are on the following pages Note Incorporate the changes in reverse alphabetical order HP 83621A 31A Instrument History Changes
16. protective covers removed A15 1310 Perform the following setup Ls 2 3 32 A15 CPU Troubleshooting Set the line power switch to STANDBY Disconnect the line power cord Wait for all the indicators in the power supply section to go out Remove the rear panel and disconnect W31 the ribbon cable that connects the motherboard to A19 Refer to the disassembly procedures as needed Temporarily replace the rear panel leaving the ribbon cable loose Take great care to ensure the ribbon cable is not in contact with any line power wires or connections Reconnect the line power cord Repeat the power on sequence and observe the indicators on A15 A15 1311 A15 1320 Did all the indicators turn on temporarily and then turn off ay Continue Go To A19 9000 Perform the following setup 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Reconnect W31 the ribbon cable that connects A19 to the motherboard Go to A15 8500 Perform the following setup 1 Set the line power switch to STANDBY 2 Remove the A14 assembly 3 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off aq Continue Go To A14 9000 A15 CPU Troubleshooting 33 A15 1321 A15 1330 A15 1331 A15 1335 34 A15 CPU Troubleshooting Perform
17. 5 to 13Vde FRONT OF INSTRUMENT Continue Go To A16 4602 A16 A17 A18 Troubleshooting 57 A16 4601 Do the following 6 Set line power switch to STANDBY Disconnect the instrument from line power Wait for all the indicators in the power supply section to go out Remove A16 Connect the instrument to line power using an isolation transformer Set the line power switch to ON Measure the voltage of the 5 Vdc unregulated supply from A17 to A16 at XA16J1 15 16 55 and 56 5 to SYNTHESIZER MOTHERBOARG 13Vde FRONT OF INSTRUMENT Go To A17 9000 Continue A16 4602 Do the following if not already performed L 2 3 Set line power switch to STANDBY Disconnect the instrument from line power Wait for all the indicators in the power supply section to go out Remove A16 58 A16 A17 A18 Troubleshooting A16 4603 Note Measure the resistance of the 5 Vdc supply to ground XA16J1 13 14 39 40 53 54 79 and 80 to ground SYNTHESIZER HOTHERRORRD FRONT OF INSTRUMENT Continue Go To A16 4620 Remove the following assemblies w A4 fractional N m A5 YO phase detector m A7 reference w AQ pulse m All FM driver w A12 SYTM driver m A13 YO driver w A14 sweep generator a Ai5 microprocessor m A6 sampler Be sure to disconnect the rigid cable connected to the input of A6 before removing A6 Otherwise damage to the cable A6 and possibly the fil
18. LOW Ven FRONT OF INSTRUMENT Continue Go To A15 9000 A10 602 There is an open on the motherboard between XA10J2 3 and XA 1531 39 or there is an open between XA10J2 33 and XA15J1 78 note that these lines are two separate signals Verify this with an ohmmeter Is jumpering the open an acceptable repair a4 Go To A22 9000 Continue A10 603 Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 14 A10 ALC Troubleshooting A10 700 A10 701 A10 702 Perform the following setup Note the pass fail condition of test 132 Press 133 ENTER Note the pass fail condition of test 133 Did both test 132 and test 133 fail ag Continue Go To A10 710 DAR Nr Did only test 132 fail ag Continue Go To A10 705 The most likely cause of this failure is either W34 A22J6 to A25J2 or A10 However before replacing A10 check all cables especially W34 and wiring harnesses around A10 and the RF deck If you find any problems correct them and then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab If you do not find any problems replace A10 go to A10 9000 if it has not already been replaced Otherwise replace the AM modulator A38 go to RF 3890 A10 ALC Troubleshooting 15 A10 705 The most likely cause of this failure is either W35 A22J5 to A24J7 or A10 However befo
19. Restart troubleshooting at A16 000 A16 208 Replace FL1 line module filtered and ac voltage selection switch wiring harness and then restart troubleshooting at A16 000 10 A16 A17 A18 Troubleshooting A16 209 A16 210 A16 300 A16 301 The A22 motherboard has a defect in the traces carrying line power Do not attempt to repair A22 Replace A22 go to A22 9000 Inspect A17 and A18 Check for signs of physical damage On the A18 assembly look closely at the large resistors underneath and adjacent to the large heat sinks on A18 Check the fuses on A17 and A18 one each If they are open replace them Restart troubleshooting with A16 000 Do not attempt to repair either assembly Replace A17 and A18 as required Reassemble the instrument and restart troubleshooting from the beginning of instrument level troubleshooting If you have already taken this action refer to A16 206 for additional information Are any A18 indicators on Go To A16 302 Continue Select the first correct condition and go to the indicated paragraph Neon Green Amber Go To HIGH VIT 13 6V PRERGSHTDWN Paragraph A18 9000 A16 320 A16 360 A16 380 A dash indicates a don t care condition A16 A17 A18 Troubleshooting 11 Ai6 302 Set the line power switch to STANDBY Disconnect the ac line cord and check the line fuse Is the line fuse good a q Go To A16 400 Go To A16 204 A16 320 Do the following 1 D
20. lt 100 ms sweep time m Slow sweep time gt 5s sweep time m Single sweep or manual sweep m Trigger sweep m Trigger out delay m Save recall registers Ig Go To ILT 4000 Continue instrument Level Troubleshooting 9 ILT 117 ILT 118 ILT 119 Did one or more of the following performance tests fail or do you believe they would have Internal Timebase Aging Rate Power Accuracy Power Flatness Maximum Leveled Power External Leveling Swept Frequency Accuracy Single Sideband Phase Noise Spurious Signals Line Related Spurious Signals Harmonics Spurious Signals Non Harmonics Continue Go To ILT 2500 Were self tests run because of a failure associated with a source module aq Continue Go To 1LT 7500 Were self tests run because of a network or scalar analyzer system failure 3 3 Continue Go To ILT 8000 10 Instrument Level Troubleshooting Frequency Switching Time OW Frequency Accuracy ILT 120 Are all failures gone Continue Done 1LT 121 You have encountered a problem not dealt with by these procedures Consult Special Cases to troubleshoot this problem instrument Level Troubleshooting 11 ILT 2000 Select the failing adjustment and go to the indicated paragraph A15 9000 as _ A14 9000 _ 17 200 ILT 2240 Failed Adjustment ADC Calibration 10 MHz Standard
21. A14 111 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A14 Sweep Generator Troubleshooting 3 Disconnect W18 From ANI Continue Go To A14 9000 A14 201 Disconnect W18 AY From A7J4 Continue Go To A7 9000 4 Ai4 Sweep Generator Troubleshooting A14 210 W418 is open or damaged Replace W18 and then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A14 Sweep Generator Troubleshooting 5 A14 300 Perform the following key sequence l om A rT I Ra Select Select I Eg feigt qe la E A PK FRONT OF INSTRUMENT Go To A14 9000 Continue 6 A14 Sweep Generator Troubleshooting A14 301 SYNTHESIZER MOUTHERSORRD FRONT OF INSTRUMENT Continue Go To A15 9000 A14 310 There is an open on the motherboard between XA14J1 35 and XA15J1 35 Verify this with an ohmmeter Is jumpering the open an acceptable repair Go To A22 9000 Continue A14 311 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A14 Sweep Generator Troubleshooting 7 A14 400 Do the following 1 Set the line power switch to STANDBY 2 Unplug the line power cord 3 Measure the resistance between XA14J1 78 and ground gt 10 kQ VOLTRETER SYNTHESIZER MOTHERBOARD acgasg dd sazadseagNaeenen gt 10 Continue
22. Adjustments Successful A13 YO Driver Troubleshooting 17 A A ng MOTRIN NANIZALI Meee ee eee APLI ee een NARNII ttanta ze spen enrenee tee NN eNN EF AAAI AEII EEE EAN nere PE EES Cree eee teeta PPEP DANNSA de Fade I Pu nn ted nrndarnenen mvenenrenenenn avnenenm som A14 Sweep Generator Troubleshooting A14 000 Message Displayed on Synthesizer Go to Paragraph Ai4 10VREF Supply A14 100 A14 1 MHz Clock A14 200 A14 Sweep Status Line A14 300 A14 Z Axis Blanking A14 400 A14 Rear Panel VSWP A14 500 A14 Triple Timer U12 A14 9000 A14 Triple Timer U13 A14 9000 A14 Bucket Counter A14 9000 A14 Event Latch Buffer A14 9000 Al4 Event RAM A14 9000 A14 Marker Control A14 9000 A14 Stop Sweep Control A14 9000 A14 Bucket Generator A14 9000 A14 ABUS Ground A14 9000 A14 Level Correction DAC A14 9000 A14 Sweeptime DAC A14 9000 A14 VSWP Output A14 9000 A14 Ramp Generator A14 9000 A14 Reset Loop A14 9000 A14 Sweep Generator Troubleshooting 1 A14 100 VOLTHETER SYNTHESIZER MOTHERBOARO Continue Go To A14 9000 A14 101 SYNTHESIZER MOTHERBOARD 10v amp 200mv Go To A13 9000 Continue 2 A14 Sweep Generator Troubleshooting A14 110 There is an open on the motherboard between XA14J2 23 and XA13J2 21 Verify this with an ohmmeter Is jumpering the open an acceptable repair ag Go To A22 9000 Continue
23. DS1 on ag Go To A2 9000 Continue Perform the following setup Set the line power switch to STANDBY Disconnect the instrument from ac line power Wait for all the indicators in the power supply section to go out Reconnect W3 Disconnect the two ribbon cables W1 wa that connect the A3 front panel processor to the A21 display Connect the instrument to ac line power using an isolation transformer and set the line power switch to ON Is the 13 6V LED green DS1 on Go To A3 9000 Go To A16 1000 A16 A17 A18 Troubleshooting 23 A16 600 A16 700 A16 701 A16 702 Were the A18 indicators correct in the previous step Go v A16 9000 Go 4 A16 5000 Were all A18 indicators correct a q Go To A16 720 Go To A16 701 Did the fan turn properly when power was turned on Go To A16 710 Continue Are any red A16 LEDs on ap Continue Go To A16 4000 24 A16 A17 A18 Troubleshooting A16 703 Measure the voltage of the 13 6 Vdc supply at XA16J1 36 to ground a TIT amagada ye r gee ansernuasadanr j Sagi 13 61 1 5Vde Continue Go To A16 9000 A16 704 Either an open exists on the motherboard between XA16J1 36 and XA18P1 49 or A18 is faulty Verify the open with an ohmmeter If an open does exist do not attempt to repair it but go to A22 9000 If no open exists go to A18 9000 A16 A17 A18 Troubleshooting 25 A16 710 Do the following 1 2
24. HP 83621A 31A SYS 650 er SYS YTM Biasing SYS 700 System Troubleshooting 1 SYS 102 Perform the following setup 1 Set the line power switch to standby 2 Disconnect W14 from the YO A26J2 Ensure that the cable does not short out anything else Set the line power switch to ON Press PRESET START Ge ED O E 5 Press msec Ignore the UNLOCK message 6 Set the oscilloscope as follows m Trigger on negative edge Sweep time 10 msec 7 Compare the waveform on the oscilloscope to the one shown Ignore the amplitude of the pulses Look for A5 sweeping to lock 8 Reconnect W14 to A26J9 a Go ASJ3 Disconnect Wit From A26J2 AD SWEEPINGE v r TO LOCK OmSee gt A2632 Go To SYS 120 Continue SYS 104 Perform the following setup 1 Press S 2 Select S tM 3 Press 652 TER 4 Select Lo 3 asterisk on 4 System Troubleshooting 9 Select on a 6 Press PRIOR 7 Select 1 the test is complete The YO Driver Gain and Linearity adjustment is the most likely cause of failure of the previous test Other YO related adjustments can also be contributing to the failures If the adjustments don t resolve the failure or if you have good reason to suspect another assembly rather than the adjustments use the following table The table used with the pass fail data obtained from the previous test indicates which assembly is the
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26. Refer to the disassembly and replacement procedures as required 5 Reconnect the ribbon cable W31 between the rear panel interface A19 and the motherboard A22 6 Reinstall the rear panel Go To A16 9000 99 A16 A17 A18 Troubleshooting A16 7010 A16 7020 A16 7021 me GO de bo 1 o gt Set the line power switch to STANDBY Reinstall one of the previously removed assemblies Set the line power switch to ON Remeasure the voltage If the voltage now fails the assembly just installed is faulty Go to Axx 9000 where xx is the assembly number For example if the assembly is A7 then go to A7 9000 Repeat this procedure until the problem has been isolated or until no more assemblies exist If no more assemblies exist go to Special Cases Lift the RF deck up into the service position Refer to the disassembly and replacement procedures as required Set the line power switch to STANDBY Remove all ribbon cables connecting the microcircuits to the RF interface board A20 Set the line power switch to ON Measure the previously failed voitage p Go To A20 9000 Continue 1 Lift the RF deck up into the service position Refer to the disassembly and replacement procedures as required Set the line power switch to STANDBY Select a microcircuit attenuator or other assembly on the RF deck and reconnect the ribbon cable for that assembly Set the line po
27. The YO Driver Gain and Linearity adjustment is the most likely cause of failure of the previous test Other YO related adjustments can also be contributing to the failures If the adjustments don t resolve the failure or if you have good reason to suspect another assembly rather than the adjustments use the following table The table used with the pass fail data obtained from the previous test indicates which assembly is the most likely cause of failure Each paragraph indicates several possible causes of failure in order of most probable cause listed first Data Point Failures Go To Paragraph 2 303 GHz only SYS 105 5 7499 GHz only SYS 106 6 8009 GHz only SYS 106 7 4 GHz only SYS 107 Switching Test only SYS 108 2 303 GHz and 6 8009 GHz only SYS 109 AM Other Combinations SYS 110 SYS 105 1 YO adjustments 2 Sampler adjustments 3 Sampler A6 4 YO A26 System Troubleshooting 5 SYS 106 SYS 107 SYS 108 SYS 109 SYS 110 SYS 120 6 System Troubleshooting pr Sampler adjustments Sampler A6 YO A26 YO adjustments RF path from the mod splitter A25 to the sampler A6 This path includes FL2 W51 W54 path and A35 not present in some instruments YO A26 YO driver A13 YO phase detector A5 YO driver A13 YO A26 Sampler A6 Sampler adjustments Using the troubleshooting block diagram located at the end of Special Cases
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29. located just prior to the Special Cases tab A20 130 There is an open on the motherboard between the RF interface board A20 and the processor A15 Consult the following table to determine the exact location of the open 8 A20 RF interface Troubleshooting 4206 RF Interface Board Name A15 Processor XA15J1 12 XA15J1 52 XA15J1 13 XA15J1 53 AALSII 14 XA15J1 54 XA20J1 5 RA2051 39 XA20J1 4 XA2011 38 XA20J1 3 XA20J1 37 A20 131 A20 136 Is jumpering the open an acceptable repair ag Go To A22 9000 Continue Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab SYNTHESIZER MITHERBOARE Continue Go To A15 9006 There is an open on the motherboard between XA20J1 57 and XA15J1 41 Verify this with an ohmmeter Is jumpering the open an acceptable repair Go To A22 9000 Continue A20 RF Interface Troubleshooting 9 A20 137 Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A20 140 SYNTHESIZER NOTHERBORRU Continue Go To A15 9000 A20 141 There is an open on the motherboard between XA20J1 33 and XA15J2 59 Verify this with an ohmmeter Is jumpering the open an acceptable repair aq Go To A22 9000 Continue A20 142 Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special C
30. performance test s refer to table 3 1 Go to Special Cases Paragraph SC 000 You are through Troubieshooting Follow the instructions displayed on the synthesizer TROUBLESHOOTING FOLDOUT IDAS tate tevree PE r rer wee tee Special Cases o eT Special Cases 1 SC 000 introduction If you have not used the Instrument Level Troubleshooting section yet go to ILT 000 before continuing with Special Cases The Instrument Level Troubleshooting section contains help with hard failures performance test and adjustment failures as well as some system failures Special Cases is not a step by step process It is a collection of routines techniques and information describing the block diagram It deals with failures and situations not covered in the previous troubleshooting sections This information is intended to be used with the overall block diagram at the end of this section In using this section you will be required to select and develop your own testing processes and make your own judgments in analyzing the results of your tests 2 Special Cases SC 100 Safety Considerations Warning When the instrument is connected to ac line power or the A18 high voltage neon indicator is on there are voltages present that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service
31. q Go To RF 2890 Continue A12 412 A high resistance exists on either W37 the ribbon cable that connects the RF deck to A28 or on A20 itself the RF interface assembly Replace W37 or A20 and then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 12 A12 Multiplier Filter Driver Troubleshooting erre e en yaa o E id O oO when D Ye 2 a a a hen y z 9 F 5 5 a 2 N re D a A a e br E gt 3 Boo E p he gt fhi E 5 Z Y 3 so lel D O fut pa ra lu Q 1 ji 3 lt amp im M p E ls i E if Ale o m E g ajil N E go i 8 O a rl 9 a A12 501 SYNTHESIZER NOTHERBOARD 10V to 16V Go To A5 9000 Continue A12 502 There is an open on the motherboard between XA12J2 26 and XA5J2 26 Verify this with an ohmmeter Is jumpering the open an acceptable repair 3 gt g Go To A22 9000 Continue A12 503 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 14 A12 Multiplier Filter Driver Troubleshooting A12 600 Do the following 1 Set power switch to standby 2 Disconnect the power cord 3 Measure the resistance of the YTF tuning coil from XA12J2 44 to XA1232 30 SYNTHESIZER MOTHERBOARK FRONT OF INSTRUMENT Continue Go To A12 9000 A12 601 Was the resistance lt 350 9 Go To A12 610 Continue A12 602 Do the
32. sweep the frequency from 2 to 7 GHz and verify that power is gt 24 5 dBm Set up for frequency measurement 1 Press 2 GHz 2 Using 4 increment the frequency 3 The measured frequency equals the front panel Indication 40 MHz 2 to 7 GHz N 20dB Attenuator ag ar Na Disconnect W51 From AT3 M Manually sweep 2 ta 7GHz AA Continue Go To ILT 2020 14 Instrument Level Troubleshooting ILT 2012 Set up for power measurement 1 Reconnect any disconnected cables 2 Put the RF deck in the service position 3 Remove W52 connects the YIG oscillator A26 to the directional coupler A39 4 Press GERE 5 Select asterisk on 6 Select Press 2 GHz 7 8 Using the rotary knob sweep the frequency from 2 to 7 GHz and verify that power is gt 8 dBm Set up for frequency measurement 1 Press 2 GHz 2 Using 4 increment the frequency 3 The measured frequency equals the front panel indication 40 MHz 2 to 7 GHz POHER METER m Yig Oscillator Disconnect W52 From A26 M Manualty sweep 2 to 7 4GHz i Go To RF 2690 Continue Instrument Level Troubleshooting 15 ILT 2013 Check W52 for damage deformation or excessive RF path loss Is W52 defective Go To RF 2590 Continue Replace W52 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab ILT 2015 Remove A6 from the synthesiz
33. tab The rear panel TRIGGER OUTPUT seems to be working properly If an undetected problem exists consider replacing the sweep generator assembly A14 9000 Instrument Level Troubleshooting 61 62 IL T 3700 ILT 3701 Press PRESET Using an oscilloscope check for TTL levels at the following points on the rear panel AUXILIARY INTERFACE connector If a failure occurs there is no TTL activity on one or more of the lines go jr to the indicated paragraph Note Some of these signals move very slowly Pin Go to aa pa arano 3710 ee ILT 3730 k EOS If no failure occurs continue with ILT 3701 Perform the following setup 1 Press START SWEEP 3 GHz 2 Press STOP SWEEP 7 GHz Check for a 0 to 10V ramp at pin 18 of the AUXILIARY connector Instrument Level Troubleshooting ILT 3702 AUXILLIARY INTERFACE t3 a Q gt s 25 REAR PANEL Sg wey sa Go To ILT 3760 Continue Locate pin 5 on the auxiliary interface Alternately short to ground and open pin 5 Observe pin 18 with voltmeter if the instrument has a front panel with a display and keyboard observe the SWEEP indicator on the front panel When pin 5 is shorted to ground the output at pin 18 should stop sweeping and the front panel SWEEP indicator should be off when the pin is not shorted to ground the output at pin 18 should sweep and the indicator should be on or blinking This is the stop sw
34. 26 65 and 66 to ground SYNTHESIZER MOTHERGORRO E a erasrncso a i anast pni avscaganacanra VPO 750 FRONT GF INSTRUMENT Continue Go To A16 4410 A16 4404 Follow the disassembly procedures to remove the RF deck Measure the resistance of the XA16J1 25 26 65 and 66 to 15 Vdc supply to ground ground SYNTHESIZER MOTHERBOARD ovosoosea H s eonn Rae FOI EE TETEN ET 2750 FRONT OF INSTRUMENT Go To A16 4430 Continue 46 A16 A17 A18 Troubleshooting A16 4405 A16 4406 Reinstall the RF deck in the service position Refer to the disassembly procedures as needed Remove the ribbon cables that connect the microcircuits to the RF deck Measure the resistance of the 15 Vdc supply to ground XA16J1 25 26 65 and 66 to ground SYMTHESIZER NOTHERBOARD tal ETTE laogoosdoverneonods ard gt 7502 FRONT OF INSTRUMENT Go To A20 9000 Continue Reconnect the microcircuit ribbon cables one at a time while measuring the resistance of the 15 Vdc supply to ground XA16J1 25 26 65 and 66 to ground Replace the microcircuit that causes a lt 750 resistance measurement Also check the 15V fuse on A16 and replace it if open Did a microcircuit cause a low resistance measurement Go To A16 4408 Continue A16 A17 A18 Troubleshooting 47 A16 4407 Go to the paragraph indicated below to replace the faulty microcircuit Microcircuit
35. 3 Oo Ot da Oo 90 N Set the line power switch to STANDBY Disconnect the instrument from ac line power Wait for all the indicators in the power supply section to go out Remove A16 Remove the rear panel and disconnect the fan Check all fuses on A16 There are six small plug in fuses and two solder in fuses All the fuses are close to the bottom of the board Replace any fuses that are open Reinstall A16 Connect the instrument to ac line power using an isolation transformer and set line power to ON the fan should still be disconnected Continue with A16 711 A16 711 Measure the voltage at XA16J1 1 415 ta 25Vde Go To A16 718 Continue 26 A16 A17 A18 Troubleshooting A16 712 Wait 2 to 3 minutes Measure the voltage at XA16J1 41 for a positive voltage greater than 2 0 Vdc This voltage may increase in value while the measurement is taken VOL THETER SYNTHESIZER NOTHERBORRS f FRONT OF INSTRUMENT Go To A16 718 Continue A16 713 Measure the voltage at A22J11 3 This connector is located at the right rear of the instrument by the fan VIK THETER SYNTHESIZER MOTHERBOARD 15 to 25Vde FRONT Of INSTRUMENT Go To A16 716 Continue A16 A17 A18 Troubleshooting 27 A16 714 Wait 2 to 3 minutes Measure the voltage at A22J11 1 for a positive voltage greater than 2 0 Vdc This voltage may increase in value while the measurement is taken This connector is located at the r
36. 3120 Disconnect W179 From A7J5 10MHz REF OUTPUT OMHz GE Go To 47 9000 Continue Replace W19 the coaxial cable that connects A7J5 to the rear panel and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Before continuing be sure that auto sweep operates correctly If it does not restart troubleshooting at ILT 000 Measure the resistance between the TRIGGER INPUT and XA15J1 61 Is the resistance gt 90 and lt 1100 ag Go To ILT 3140 Continue instrument Level Troubleshooting 43 ILT 3121 Perform the following setup 2 Select Go To A15 9000 Continue ILT 3122 Is the front panel SWEEP indicator flashing and do you have a front panel ag Continue Go To A15 9000 44 Instrument Level Troubleshooting ILT 3123 ILT 3124 ILT 3125 Perform the following setup m Connect a function generator to the rear panel trigger input m Set the function generator for a 10 Hz TTL square wave a Observe the SWEEP OUTPUT on the rear panel REAR PANEL OV to 10V RAMP Y Go To ILT 3150 Continue Does your instrument have a front panel with a display and is the front panel SWEEP indicator flashing Go To ILT 3170 Continue The trigger and sweep output seem to be working If an undetected failure exists look at the instrument block diagram located at the end of Special Cases The assemblies most intimately tied to the trigger input and sw
37. A15 go to A15 9000 Otherwise you are done A15 CPU Troubleshooting 45 A15 9000 A15 9001 46 A15 CPU Troubleshooting Perform the following Set the line power switch to STANDBY Remove the A15 assembly Install a new A15 assembly Set the line power switch to ON en v rer ar fatt Se eaten Ka rpm Ne dT ty EY O hal ape a EL NET A Ene Press 228 ENTER Fore om DO me OO ND Be perry rere q Go To A15 9005 Continue The calibration data stored in RAM and EEROM on the failed A15 assembly appears intact The following procedure retains the calibration data by transferring the EEROMs to the new A15 assembly However the replacement of the EEROMs on A15 is somewhat _ complex Do not rush through this procedure A single error could cause you to lose all the calibration data This data requires several days to recreate Carefully follow these steps 1 Set the line power switch to STANDBY 2 Remove the line power cord 3 Very carefully remove the defective A15 assembly and place it on an ESD mat 4 Using appropriate tools and taking great care not to damage the EEROM U14 remove the EEROM from the defective A15 assembly and install the EEROM U14 on the new A15 assembly 5 Install the new A15 assembly in the instrument 6 Reconnect line power A15 9002 A15 9005 7 Set the line power switch to ON 10 11 12 Go To A15 9020 Continue To retain traceabi
38. A2 A19 is faulty 3 W2 is faulty connects the A2 assembly to the motherboard 88 Instrument Level Troubleshooting 4 W31 is faulty connects the A19 assembly to the motherboard 5 The ALC assembly A10 is faulty This may be true only if leveling is the problem 6 The source module is faulty To confirm this try to use the unused SMI connector or substitute a new source module or synthesizer 7 A remote possibility exists that the motherboard A22 has a fault If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem instrument Level Troubleshooting 89 ILT 8000 The best way to find network analyzer problems is by testing the input and output ports To do this refer to paragraph ILT 3000 Each port is listed and can be tested separately The ports of interest in a network analyzer will most likely be the following w For instruments using Analyzer language set the switch to 1 binary 001 If the instrument is used with HP 8510 systems either set the language part of the switch to 1 or set the language to Analyzer language at the front panel This is also applies to systems that depend on HP 8340 8341 compatibility m Concerning the address switches the HP 8510 and other systems assume that the HP IB address is 19 binary 10011 w Using the network analyzer s On Site Service Handbook verfiy that all conn
39. Are any of the switches set incorrectly Go To ILT 3301 a Correct the switch settings reinstall A12 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 52 Instrument Level Troubleshooting ILT 3301 ILT 3302 Perform the following setup 1 Press CHE TWE 2 Press 5 sec 3 Observe the Volts GHz out the rear panel 4 The scaling of the ramp can be 1 0 5 or 0 25 V GHz See the following table Upper Frequency Scaling Limit GHz Volts GHz lt 15 1 0 15 to 30 0 5 REAR PANEL Skans D e or ster GHz 5sec OS RR Go To ILT 3303 Continue Nothing seems to be wrong with the Volts GHz output If there is an undetected fault the most likely source is the multiplier filter driver assembly A12 If the problem still exists go to Special Cases to troubleshoot this problem instrument Level Troubleshooting 53 ILT 3303 Disconnect W27 From Ai2J1 W27 VOLTS GHz Go To A12 9000 Continue Replace W27 connects A12 to the rear panel Volts GHz and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab ILT 3400 Perform the following setup 1 Press SWEEP TIME 2 Press 30 SEC Alternately short to ground and open the rear panel STOP SWEEP IN OUT center conductor Observe the SWEEP OUTPUT at the rear panel with a voltmeter if the instrument has a front panel with a display and key
40. CW frequency equals 26 5 GHz If there is an unleveled condition at a specific frequency set that CW frequency and repeat steps 1 through 3 Disconnect W57 From A38 POKER METER Range From lt 28dBm to gt OdBm FREQUENCY COURTER 14 Continue Go To RF 2990 SYS 602 Perform the following setup Set the power switch to standby Reconnect any disconnected cables Disconnect W56 from the A28 amp multiplier Connect a power meter to the output of A28 Turn power on Press cw Press the up arrow and increment the frequency from 2 to 26 5 GHz The power level should be greater than 5 dBm Use a frequency counter to verify that the end points of the frequency range have been measured pq Continue Go To RF 3890 IM OT 0 ND ke 12 System Troubleshooting SYS 603 SYS 605 SYS 606 Perform the following setup Set the power switch to standby Reconnect any disconnected cables Disconnect W49 from the A41 diode switch Connect a power meter to the output of A41 Turn power on Press cw Press the up arrow and increment the frequency from 2 to 7 GHz The power level should be greater than 8 dBm Use a frequency counter to verify that the end points of the frequency range have been measured ap Go To RF 4190 Go To RF 2890 I Co om GW bh re Use a power meter to measure the power out the RF output connector Does power meet specifications in all band
41. Change PCO HP Internal Use Only No Change Needed 10940 Serial Prefix Number 3317A 32454 B 10795 10825 3213A B 10258 31434 B 10492 31394 B 10385 3137A B A 10135 3108A B A 09966 3104A B A 10304 3103A B A HP 83651A instrument History Changes Serial Prefix Change Number No Change Needed PCO HP Internal Use Only 10940 B 10795 10825 10258 10492 10385 HP 8360 Troubleshooting _ NAAA J a Change B Instruments with serial prefix 3245A and lower use a modulator splitter A25 rather than an AM modulator A38 diode switch A41 coupler A39 and 20 dB attenuator AT3 Also HP 83651A instruments with serial prefix 3245A and lower user a DC blocking capacitor A36 and a coupler detector rather than the bridge detector A30 Make the following changes to the Troubleshooting manual Instrument Level ILT 2011 Troubleshooting 1 Change step 3 to read Remove W51 which connects section the mod splitter A25 to the filter FL2 2 In step 8 verify that the power is gt 24 5 dBm 3 Change the measurement setup illustration to show W51 being disconnected from the 20 dB attenuator AT3 and a power measurement of gt 24 5 dBm ILT 2012 In step 3 change the directional coupler to the mod splitter A25 ILT 2020 1 Change the directional coupler to the mod splitter A25
42. External ALC Input Rear Panel Source Module Interface Front Panel Source Module Interface IB Input Output 10 MHz Ref Input Trigger Input Sweep Output Stop Sweep Input Output Auxiliary Interface Rear Panel HP IB Address Switches Select the first faulty 1 0 port listed below Go to Paragraph ILT 3010 ILT 3020 ILT 2240 put ILT 3060 ILT 3070 ILT 3080 ILT 3090 1 1 3100 Ref Output ILT 3110 ILT 3120 ILT 3200 ILT 3300 ILT 3400 Z Axis Blanking Markers Output LT 3500 3700 3800 Output ILT 3600 ILT ILT Repeatedly select ttribute Does the ponr remain when you toggle ap Done Continue ILT 3011 The remaining display problems are most likely one of the following a Cosmetic fault The display appearance is fuzzy varies in brightness from segment to segment or another superficial characteristic is questionable Replace the display go to A21 9000 m The display takes a long time to update and UNLOCK flashes in the display Press and select L 3 The following is a prioritized list Find the first one gt that applies 1 REF UNLOCK go to A7 9000 2 SAMPLER UNLOCK go to A6 9000 3 FRACN UNLOCK go to A4 9000 4 YO UNLOCK consider the following in the order listed a A6 go to A6 9000 b A5 go to A5 9000 c A13 go to A13 9000 d A26 go to RF 2690 5 HET UNLOCK go to RF 2490 m If the display u
43. Foldout x Block 1 Perform Adjustments xLocated in front of the Special Cases tab lt Adjustments SSuccessful A5 YO Loop Troubleshooting A5 000 Message Displayed on Synthesizer Go to Paragraph A5 Digital Interface A5 100 A5 ABUS Ground A5 200 A5 Switched Amplifier A5 300 A5 IF Frequency Counter A5 400 A5 Integrator A5 500 A5 Overmod Detector A5 600 A5 Phase Detector A5 8500 A5 Output to YO Driver A5 8500 A5 Output to FM Coil A5 8500 A5 Track and Hold A5 8500 A5 YO Loop Troubleshooting 1 A5 100 Perform the ne tey sequence FRONT OF INSTRUMENT Continue Go To A5 8500 2 A5 YO Loop Troubleshooting A5 110 P A Go To A15 9000 Continue n on the motherboard between XA5J1 7 A5 111 There is an Ope and XA153 1 10 Verify this with an ohmmeter jumpering the open an acceptable repair Go To A22 9000 Continue er and go to the Tr t prior to the A5 112 Install a jump oubleshooting Foldout block 1 located jus Special Cases tab A5 200 Perform the following key sequence 1 Press GREE ED 2 Select Selfter A5 YO Loop Troubleshooting 3 Continue A5 220 Verify that Portions of the si gnal are lt 700 mv OWever expect some Portions of the signal to rise to levels of up to 15 Vde is is not a failure as long as Portions of the signal are lt 700 mv 7 SILOS SYNTHESIZER BOTHERROA RO P 8 Ji E Continue Go To A15
44. Go To Paragraph A29 amp filter A28 amp multiplier A26 YO A24 low band A31 attenuator A32 amp doubler A33 amp switch A16 4408 You may have removed the defect in the disassembly process or the problem may be intermittent Also check the 15V fuse on A16 and replace it if open Go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A16 4410 Reinstall the previously removed assemblies one at a time while measuring the resistance of the 15 Vdc to ground XA16J1 25 26 65 and 66 to ground Replace the assembly that causes a resistance measurement of lt 7502 If no assembly causes a low resistance measurement you may have removed the defect in the disassembly process or the problem may be intermittent Also check the 15V fuse on A16 and replace it if open Go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 48 A16 A17 A18 Troubleshooting A16 4420 A16 4421 A16 4430 Check the 15V fuse on A16 Is the fuse open a 3 Go To A16 7600 Continue Do the following 1 Replace the defective fuse 2 Install A16 3 Connect the instrument to line power using an isolation transformer 4 Set the line power switch to ON Is the green 15V LED on ag Go To A16 7000 Continue Replacing the fuse seems to have fixed the problem but this simple solution is suspect You may want to monitor the instrument fo
45. Interface Troubleshooting A20 102 Signal Location XA20J1 44 XA20J1 8 XA20J1 43 XA20 1 7 XA20J1 42 Go To A20 125 Continue Perform the following GERVICE 3 4 Select 5 Select 6 Check for TTL activity at the points listed in the following table 7 If any measurement fails consider the test failed If 8 A20 RF interface Troubleshooting 3 Go To A20 136 y Signal Location XA203J1 5 XA20J1 39 XA20J1 4 XA20J1 38 XA20J1 3 XA20J1 37 A20 103 Perform the following setup 1 2 Select 3 Press 4 Select I 5 4 A20 RF interface Troubleshooting Go To A20 135 Continue A20 104 Perform the following setup 1 Press wn Select DANA 2 3 Press 4 Select i asterisk meo AA ri re tm ster 7 Select ATON AN TYF A20 RF Interface Troubleshooting 5 8 After making the following measurement to exit the test select L E OSCILLOSCOPE gt 4 0Vp FRONT OF INSTRUMENT Continue Go To A20 140 A20 105 Following the disassembly and replacement procedures lift the RF deck up into the service position Check the ribbon cable that connects the YO A26 to the RF interface board A20 If it is loose then reseat the cable Correct any other obvious faults Perform the following test 1 Press SERVICE 2 S elect mse 3 Press 4 Select 1 If the test fails go to RF 2690
46. Otherwise go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab x 6 A20 RF interface Troubleshooting A20 120 A20 121 A20 125 There is an open on the motherboard between the RF interface board A20 and the post regulator A16 Consult the following table to determine the exact location of the open Verify this with an ohmmeter A16 Post Regulator A20 RF interface Board XA16J1 30 31 70 71 XA20J1 24 25 59 60 XA16J1 25 26 65 66 XA20J1 26 61 XA1631 22 62 XA20J1 27 62 XA1631 13 14 53 54 XA20J1 31 32 66 67 XA16J1 39 40 79 80 XA20J1 13 48 XA16J1 76 XA20J1 68 XA16J1 6 7 8 46 47 48 XA20J1 14 15 49 50 Is jumpering the open an acceptable repair aq Go To A22 9000 Continue Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab There is an open on the motherboard between the RF interface board A20 and the processor A15 Consult the following table to determine the exact location of the open Verify this with an ohmmeter A20 RF Interface Troubleshooting 7 Name A15 A20 RF Processor Interface Board AB2 XA15J1 8 XA20J1 44 XA153J1 48 XA2031 8 XA15J1 9 XA20J1 43 XA15J1 49 XA2051 7 XA15J1 10 XA20J1 42 Is jumpering the open an acceptable repair Go To A22 9000 Conine A20 126 Install a jumper Then go to the Troubleshooting Foldout block 1
47. Press 2 Select ay Go To A4 9000 Continue The adjustment may have repaired the A4 assembly Go to Instrument Level Troubleshooting N Troubleshooting A4 320 The pulse width is 10 to 20 ns The frequency is 125 kHz The oscilloscope must present a 500 load Do not use a high impedance probe The combination of low frequency and narrow pulse width makes this a very difficult pulse to see Do not use a frequency counter to check frequency because of the tendency to count the second harmonic Disconnect W11 from A7J3 Go To A7 9000 Continue A4 321 Replace W11 A7J3 to A4J1 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A4 Fractional N Troubleshooting 11 A4 400 Loop self test psu 3 Press G7 DER i 4 Select Loop Do Go To A4 1340 Go To A4 9000 12 A4 Fractional N Troubleshooting A4 1300 A4 1301 A4 1305 A4 1306 There is an open on the motherboard between XA4J1 15 16 40 or 41 and XA7J1 15 16 40 or 41 Verify this with an ohmmeter Is jumpering an acceptable repair E 67 Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab There is an open on the motherboard between XA4J1 43 and XA7J1 43 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue Install a jumper and go to the Troubl
48. Replacement Procedures in the Service manual for instructions b Replace A16 go to A16 9000 c Replace A17 go to A17 9000 A16 383 Refer to A16 382 In addition consider A18 for replacement go to A18 9000 Finally return to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A16 384 Perform the following 1 Set the line power switch to STANDBY 2 Disconnect power and wait for all indicators in the power supply to go out 3 Remove A17 and A18 Go to A16 205 18 A16 A17 A18 Troubleshooting A16 385 A16 390 A16 391 In this case change both A18 and A17 Go to A17 9000 then A18 9000 Then restart troubleshooting at A16 000 When you are confident that the power supply is good begin troubleshooting at ILT 000 Do the following 1 Set the line power switch to STANDBY 2 Disconnect the instrument from ac line power 3 Remove A15 4 Connect the instrument to ac line power using an isolation transformer and set the line power switch to ON Is the A18 5VHD OVER CURRENT indicator on ag Go To A15 9000 Continue Do the following 1 Set the line power switch to STANDBY 2 Disconnect the instrument from ac line power 3 Wait for all the indicators in the power supply section to go out 4 Install A15 Install A16 Remove the front panel and disconnect the ribbon cables W2 and W3 that connect the front panel to the motherboard 7 Conne
49. S A Troubleshooting How to Use This Chapter Menus f you are not familiar with the menus in this instrument go to the Menus chapter in the Service manual and fold out the service menu map see the following figure Use the map for reference as you troubleshoot HP 8360 Troubleshooting Introduction 1 1 Where to Begin Troubleshooting Caution Follow all troubleshooting procedures in the order given y Done out of order these procedures can miss critical checks You can waste time and possibly replace the wrong assembly Begin with Instrument Level Troubleshooting This section directs you to the appropriate troubleshooting module Troubleshooting These modules pictorially guide you through the Modules required measurement steps see the following example Each module covers one or more assemblies and isolates a problem to the assembly level Test Equipment Used YRTMESIZER NOTHERBOARE Pins Measured A Connector Measured Signals Measured Where to go if the Where to go if the Measurement Fails Measurement Passes 1 2 Troubleshooting Introduction HP 8360 Special Cases This section covers problems not isolated in the troubleshooting modules Special Cases aiso contains an instrument block diagram Troubleshooting Foidout The troubleshooting foldout referenced in the troubleshooting modules is located just prior to the Special Cases tab Equipment Required Tabl
50. ST ee nt ST vu a AS OE ASKER SHIP OMD GIRARE Gi ene A uap OF sim va 2811 vi i i E wapo Ry Y A A ZHWROh SL 4901 pe SHG E gt Chiens TED AO THING 593 cm MA EEN ZHAO TH 1 Ey j vor 4 o G i A NVR ped we GE F E Y RAG OA MID OA RE e y 3 E w i po UNG ned IA nn OE e GIA THAOD OT a gt m on eT oA HE Wa ee Sofie hf re LHR CUNA vid e f ZIA 401393130 dJSvHd ag EE EAD CANED AN MED sett OD 05 ERRO OT Tid dl H F as OA SVA ou er 7 P SISSHINAS AQNINO3YS 1 O INON LASENG SSMM HNYIG IMS JOLIS AIAS SKY Z ua DOGY 1 ol fr LNG 1NdNE zHO A OA i len A UN CIINVA SV3Y INS SIV O d d i GR am eee cece co aNd 23138 2 AHORGR ONY OMLNOS j Bea zr BAGINTOD SME Ne MID ja l SOLVEINIO os A ar f GIO OGIrOG at peren AAA DD EEE JR 4 sna ONUWOI rai Y hoy vd OVE nov i 35 Vid BY OG devia DnS q LON a a i MY OL MW DL day DL AO TANVd YV3Y INS REMO AL Sty E M ae S SP g OYYOSHIHLON 6 Zev O d TER se tho mere u pi he atre Nord ed Ss Pee PNAS A la L ais rie Aa T Te i i INS gY l 6 y i s i x Dar HO TANG AA nt ha A
51. Service manual for substitute front panel ordering information Start the front panel emulation software or install a substitute front panel If the front panel emulation software or substitute front panel is operational go to ILT 103 If not use the following information to determine the next step m If you used a substitute front panel but it didn t work restart troubleshooting with that substitute front panel installed go to ILT 000 a If you used the front panel emulator program part of the Service Support Software but it didn t work go to ILT 6810 tnt ILT 6000 Replace RPG1 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 72 Instrument Level Troubleshooting ILT 6500 ILT 6501 ILT 6502 ILT 6504 Does your instrument have a front panel display and keyboard a q Go To 1LT 6810 Continue Does the instrument display k POWER SUPPLY FAILURE x x x Continue Go To ILT 6860 Does the instrument display xxx CHECK INSTRUMENT Continue Go To ILT 6811 Is the display blank nearly blank or unintelligible ag Continue Go To ILT 6805 Instrument Level Troubleshooting 73 ILT 6505 ILT 6506 ILT 6507 ILT 6508 ILT 6800 Is the keyboard unresponsive Continue Go To ILT 6805 Is the front panel red INSTR CHECK light on aq Continue Go To ILT 6811 Does the display appear correct except for missing segments
52. To A16 7000 Continue A16 4721 Do the following 1 Replace the defective fuse 2 Install A16 3 Connect the instrument to line power using an isolation transformer 4 Set the line power switch to ON Is the green 8V LED on Go To A16 7000 Continue Replacing the fuse seems to have fixed the problem but this simple solution is suspect You may want to monitor the instrument for several minutes with the covers on to insure that an intermittent problem does not exist Go to the Troubleshooting Foldout block 1 70 A16 A17 A18 Troubleshooting A16 4730 Refer to the disassembly procedures to remove the rear panel and disconnect ribbon cable W31 from the motherboard Measure the resistance of the 8 Vde supply to ground XA16J1 7 8 47 and 48 to ground SYRTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Go To A22 9000 Go To A19 9000 A16 4800 Measure the voltage of the 15 Vdc unregulated supply from A17 to A16 at XA16J1 32 33 72 and 73 SYNTHESIZER MOTHERGOARS FRONT OF INSTRUMENT Continue Go To A16 4802 A16 A17 A18 Troubleshooting 71 A16 4801 Do the following 1 Set line power switch to STANDBY 2 Disconnect the instrument from line power 3 Wait for all the indicators in the power supply section to go out 4 Remove A16 5 Connect the instrument to line power using an isolation transformer 6 Set the line power switch to ON Measure the voltage of the 15 Vdc unregulated supply
53. Vert Sensitivity lt 5 mV Div Horiz Sensitivity 50 ns Div 10 Magnifier Trigger Event Triggerable Oscilloscope 54111D 541 10D Oscilloscope Probes Power Meter Power Range 1 uW to 100 mW Accuracy 0 01 0 01 to 0 05 GHz 10 05 to 26 5 GHz 0 05 to 50 GHz Service Accessory Kit 1 May be replaced by a spectrum analyzer 2 For ordering information see Replaceable Parts in the Service manual 1 4 Troubleshooting Introduction HP 8360 Instrument Level Troubleshooting EEE ERE SG EOD EE ILT 000 Begin Follow the instructions in this section in the order i given The equipment required to troubleshoot the Troubleshooting synthesizer is listed in table 1 1 in the introduction to troubleshooting You may use any equipment that meets the critical specifications listed Go to paragraph ILT 100 instrument Level Troubleshooting 1 ILT 100 ILT 101 Can you safely connect the instrument to line power gel Go To 416 000 Continue Turn on line power and make the following observations during power up The amber standby light goes off w The green power on light comes on m The fan operates Because the fan is very quiet you may need to feel for airflow Is line power on and does the unit appear safe to operate a 4 Go To A16 000 Continue Does the amber standby light go off the green power on light come on and the fan operate a4 Go To A16 060 Continue 2 Instrumen
54. alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem The most probable fault is a loose cable between A24 and the RF OUTPUT connector Use the block diagram to guide you in checking power levels between A30 and the RF OUTPUT connector Then use the block diagram to check the following items 1 The RF OUTPUT connector 2 The amplifier multiplier RF 2890 in the HP 83621A 31A and the amp doubler RF 3290 in the HP 836514 3 The amp doubler RF 3290 The bridge detector RF 3090 5 The amp doubler RF 3290 HP 83651A only in Instrument Level Troubleshooting 21 ILT 2260 Repair reseat or reconnect the cables as required and continue with the performance tests or adjustments as required ILT 2500 At this point all adjustments related to the failing performance test should have been successfully completed Select the first failing performance test and go to the indicated paragraph Failing Performance Test o Go to Paragraph Frequency Switching Time Swept Frequency Accuracy o trazo Power Accuracy ILT 2610 Line related spurs are spurious signals offset from the carrier by multiples of the line frequency If for example the line frequency is 60 Hz line related spurs can occur at 60 120 180 240 Hz and so on The most prevalent spur Is the second harmonic Power Flatness
55. and loops you can verify whether a specific instrument state causes a failure and you can check the apparent state what the processor thinks of the hardware The following example sets up the fractional N A4 loop at 50 MHz looks at the fractional N OOL line Out Of Lock and views the YO and other frequencies Note When the display indicates a loop value this is the frequency that the microprocessor has set up The frequency was not ug measured and reported Therefore if the frequency displayed is different from real frequency you have an indication of a problem 1 Press CW keeps the fractional N at one frequency 2 Press 3 Select Select Select E 4 Control Phase Locked Loop 5 6 Press Sets the fractional N to 50 MHz i 8 9 pr ry Press PRIOR Y cares MHz 10 Special Cases Interpret the r display as follows Label Interpretation FRAC N MHz The frequency of the fractional N A4 SAMPLER MHz The frequency of the sampler A6 The fractional N frequency divisor in the YO phase detector A5 This number should be 3 or 4 HARM The harmonic of the sampler frequency BAND The frequency band we are using 0 through 4 This indicates the harmonic of the YO to which the SYTM A28 is tuned Except in the case of band 0 where the frequency of the YO is mixed down using the low band A24 assembly Now select e asterisk on I
56. configuration number is wrong continue with the following key sequence otherwise go to paragraph ILT 113 y Select E 2 Input the correct calibration constant and press 3 Select 4 Press PRESET Go to paragraph ILT 111 Sete Instrument Level Troubleshooting 81 ILT 7100 A custom or user preset can look like a failure especially if the user preset is mistakenly implemented instead of the factory preset The following is a list of failures you might encounter and some possible causes to look for in a user preset Failures Possible Causes External reference is selected and External reference is not 10 MHz at 6 dBm External reference is not connected Reference is connected incorrectly External leveling is selected and There is no external ALC input An improper external leveling point is selected The external ALC input is connected but the RF sour turned off Leveling mode is selected There is an improper combination of external ALC and ALC bandwidths Inaccurate RF External leveling or AM selected and Power ALC leveling search mode is selected AM is selected with de levels at the AM input An instrument without a front panel has the RF output turned off DC FM frequency offset or multiplier is selected and DC FM is selected with a de voltage applied A frequency offset is selected A frequency multiplier is selected Sweep Does Not Single or external sweep
57. following observations during power up e Amber standby light OFF front panel m Green power on light ON front panel u A18 neon high voltage indicator DS2 ON u A18 green 13 6V LED DS1 ON s A18 amber preregulator shutdown LED DS7 OFF s All other A18 LEDs OFF s A16 green LEDs from left to right component side or from right to left when facing the front of the instrument 22V STBY ON 5V ON 8V ON 15V ON 5VHD ON 5V ON 15V ON 40V ON Al6 red LEDs OFF a The fan is operating 2 Ignore any activity on the front panel display 3 Turn the line power switch OFF A16 A17 A18 Troubleshooting 5 Were all the indicators correct and does the instrument appear safe to operate aq Go To A16 700 Go To ILT 000 A16 200 Do the following 1 Disconnect the ac line power cord 2 Wait for all the indicators in the power supply section to go out 3 Remove the rear panel completely refer to the disassembly and replacement procedures as required 4 Disconnect and inspect the 8 pin line switch connector ac voltage selection switch line module fuse holder and other attached hardware for damage or discoloration 5 Inspect the motherboard Do the parts appear damaged g g Continue Go To A16 207 6 A16 A17 A18 Troubleshooting A16 201 Measure the resistance of the three line power connections high low and ground with re
58. from A17 to A16 at XA16J1 32 33 72 and 73 SYNTHESIZER MOTHERBOARD geneae OF jaa cacaos ara Y FRONT OF INSTRUMENT Go To A17 9000 Continue A16 4802 Do the following if not already performed 1 Set line power switch to STANDBY 2 Disconnect the instrument from line power 3 Wait for all the indicators in the power supply section to go out 4 Remove A16 72 A16 A17 A18 Troubleshooting A16 4803 Note i 6Ancanu4da Nana Measure the resistance of the 15 Vde supply to ground XA16J1 30 31 70 and 71 to ground SYNTHESIZER MOTHERBOARD ES paanaor lt FRONT OF MSTRUMENT Continue Go To A16 4820 Remove the following assemblies m A4 fractional N m A5 YO phase detector m AT reference m A9 pulse m Ali FM driver w A12 SYTM driver m A13 YO driver Ai4 sweep generator m A15 microprocessor m A6 sampler Be sure to disconnect the rigid cable connected to the input of A6 before removing A6 Otherwise damage to the cable A6 and possibly the filter FL2 can occur A16 A17 A18 Troubleshooting 73 Measure the resistance of the 15 Vdc supply to ground XA16J1 30 31 70 and 71 to ground SYNTHESIZER MOTHERBORRO ge COHOMaAMe cosas OPA fonoca sorna PP Continue Go To A16 4810 A16 4804 Refer to the disassembly procedures to remove the RF deck Measure the resistance of the 15 Vdc supply to ground XA16J1 30 31 70 and 7
59. ii DTE 4 5 0Vd 13 6Vde FRONT OF INSTRUMENT Go To A16 000 Continue ILT 6861 H FRONT OF INSTRUMENT Go To A16 000 Go To A16 1000 78 Instrument Level Troubleshooting ILT 6900 The most likely cause for this failure is the keyboard assembly A1 9000 but the front panel microprocessor assembly A3 9000 could also be at fault If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem instrument Level Troubleshooting 79 ILT 7000 Recall the calibration constants from EEPROM 1 Press 2 Select View calibration constant 463 hardware configuration again If a password is set you must know it to do this step GERVICE 1 Press 2 Select 3 If ENTER PASSWORD 0 appears on the top line of the display a Enter the password b Press C Select Ae 4 Select Press 463 ENTER 6 Note the value of calibration constant 463 Compare it to the following list HP 83621A 30864 HP 83631A 30864 HP 83651A 32176 Gt Is the synthesizer hardware configuration number correct aq Continue Go To ILT 111 80 Instrument Level Troubleshooting era eins ILT 7001 Since the hardware configuration number was incorrect in both the working memory and EEPROM it is likely that this is not the only fault ees If you are sure the synthesizer hardware
60. is obtained using a feedback path The entire path forward and feedback is as follows Beginning with the YO A26 the signal is passed to the directional coupler A sampled portion of the directional coupler output is fed back through W51 FL2 and W54 to the sampler A6 Harmonic mixing takes place in the sampler A6 and then the heterodyned output from the sampler A6 is fed to the YO phase detector This signal is mixed with the divided output of the fractional N A4 to obtain phase error information This phase error signal is amplified by the YO driver and used to control the frequency of the YO A26 Note that the YO is driven by a low frequency path via A13 and a high frequency path out of the YO phase detector A5 H either path is broken the YO will not lock Two ALC loops exist One loop exists for band 0 not present in ail instruments the other loop is for all other bands The band 0 path includes the sampled and detected output from the low band A24 via W24 to the ALC A10 This voltage is compared to a reference from A14 The difference between these signals is an error signal that is amplified and sent back to the low band A24 modulator The second ALC loop begins with the bridge detector Like band 0 this signal goes to the ALC A10 where it is compared to a reference The difference between the reference and the detector output voltage is used as an error signal This error signal is sent back to the AM modula
61. pass a 3 Go To A2 9000 Continue Perform the following setup 1 Press PRESET 2 Press SWEEP TIME 10 0 SEC Using either an oscilloscope or a voltmeter check the following voltages on the front panel SMI connector Note that pin 12 is a sweep ramp To adjust the sweep ramp change the instrument sweep time if you use an oscilloscope try a sweep time of approximately 100 ms 15 Vde Did all voltages pass amg Go To ILT 3075 Continue Instrument Level Troubleshooting 35 ILT 3072 Measure on the center pin at each end of the cable FRONT PANEL SMI CONNECTOR Wio Continue Go To ILT 3074 ILT 3073 Replace the cable W10 that connects the front panel SMI input to the A10 assembly and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab ILT 3074 Although the problem has not been isolated the following are possible m The front panel SMI A2 is faulty a W2 is faulty connects A2 to the motherboard m The ALC assembly A10 is faulty This is true if leveling is the problem m The source module used with the synthesizer is faulty To confirm this either use the rear panel SMI or substitute a new source module or synthesizer m A remote possibility exists that the motherboard A22 is faulty If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this
62. power measurement 1 Reconnect any disconnected cables 2 Put the RF deck in the service position 3 Remove W52 connects the YIG oscillator A26 to the directional coupler A39 4 Press EEE 5 Select Tools asterisk on 6 Select 7 Press 2 GHz 8 Using the rotary knob sweep the frequency from 2 0 to 7 4 GHz and verify that power is gt 11 5 dBm Set up for frequency measurement 1 Press 2 GHz 2 Using 4 increment the frequency 3 The measured frequency equals the front panel indication 40 MHz 2 0 to 7 4 GHz YIG Disconnect W52 From A2S M manuaty sweep 2 0 TO 7 4GHz UG Go To RF 2690 Continue A6 Sampler Troubleshooting 11 A6 403 A6 410 A6 420 Check W52 for damage deformation or excessive RF path loss Is W52 defective aq Go To RF 3990 Continue Replace W52 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Remove A6 from the synthesizer and disconnect W54 from A6 Inspect and test W54 for defects Is W54 defective aa Go To A6 9000 Continue Replace W54 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab There is a high loss path between the directional coupler A39 and the sampler A6 This path includes two hard lines W54 W51 a low pass filter FL2 and an attenuator AT3 The most likely failure is a poor connection Correct t
63. re angpao O Continue Was the resistance lt 350 aq Go To A12 410 Continue Do the following 1 Remove A12 2 Measure the resistance of the SY TM tuning coil from XA 1232 14 to XA12J52 60 A12 Multiplier Filter Driver Troubleshooting 9 A12 403 SYNTHESIZER MOTHERDORRD mn KAZ 1 pagos GY aaneeratadsansan Mp Continue Go To A12 9000 Do the following mw Disconnect W37 from A28J1 ribbon cable connecting RF interface to amp multiplier m Check for an open circuit between XA12J2 14 and XA12J2 60 gt 100 kQ SYNTHESIZER MOTHERBOARD Continue Go To RF 2890 10 A12 Multiplier Filter Driver Troubleshooting A12 404 Do the following m Using the disassembly instructions in the manual remove the RF Deck w Check for an open circuit between XA12J2 14 and XA12J2 60 gt 100 kQ SYNTRESTZER NOTHERROARD VOLTNETER sema nasa pga plc el El XA 1232 FRONT OF INSTRUMENT Go To A22 9000 Go To A20 9000 A12 410 YOLTHETER SYNTHESIZER NOTHERBOARD MOM aonane PPT TE aaia eai ee lt 20 Go To A22 9000 Continue A12 Multiplier Filter Driver Troubleshooting 11 A12 411 Do the following m Using the disassembly instructions in the manual remove the RF deck m Disconnect W37 from A28 amp multiplier n Measure the resistance of the YTM coil at the amp multiplier The resistance should be gt 35 to lt 650 between A28J7 4 and A28J7 12
64. sequence and observe the indicators on A15 So Did all the indicators turn on temporarily and then turn ag Go To A15 8500 Go To A20 9000 A15 CPU Troubleshooting 27 A15 1120 A15 1200 28 A15 CPU Troubleshooting One of the following assemblies is defective E A4 fractional n w A5 YO loop m T reference m AQ pulse m A10 ALC m All FM driver u A12 SYTM driver A13 YO driver A14 sweep generator 1 Set the line power switch to STANDBY 2 Replace an assembly 3 Set the line power switch to ON 4 Check the display s operation If the display or the indicators on A15 begin to operate incorrectly the assembly just replaced is defective If the display does not fail replace another assembly and repeat the process When the defective assembly is identified go to the 9000 paragraph for that assembly for replacement instructions For example for A4 go to A4 9000 for A5 go to A5 9000 and so on Perform the following setup 1 Set the line power switch to ON and observe the 12 LEDs on the top edge of A15 2 When the 4 left most LEDs DS1 display 0010 observe and record the state of the right 8 LEDs DS2 and DS3 3 Find the state of the right 8 LEDs in the following table and go to the indicated paragraph Go To Paragraph X1XX XXXX XXX XXXX 11XX XXXX A15 1201 AH Else A15 8500 A15 1201 An EEROM failure has occurred There is some chance that the EEROM data can be
65. square pad correctly indicates pin 1 A2 Source Module Interface Troubleshooting 3 If one or more signals do not have TTI pulses the test has failed If all signals have TTL pulses the test has passed Signal Location A2231 22 A22J1 21 A22J1 20 A22J1 19 A2231 18 A22J1 17 A22J1 16 A22J1 15 Go 4 A2 1310 K A2 104 Loop self test ke 3 Press l arn a A O me ror elect Loop I G i 3 em pip eter ad meer oe bel 4 A2 Source Module interface Troubleshooting Location A22J1 28 A2231 27 A22J1 26 A22J1 25 A22J1 23 If one or more signals do not have TTL pulses the test has failed If all signals have TTE pulses the test has passed Go To A2 1315 Go To A2 8000 A2 Source Module Interface Troubleshooting 5 A2 200 A22J1 is located at the very front of the instrument on the motherboard Early versions of the A22J1 motherboard pins may be mislabeled The square pad correctly indicates pin 1 SYNTHESIZER MOTHERBOARD Go To A2 1320 Continue A2 201 VOLTNETER SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Go To A2 1325 Go To A2 8000 6 A2 Source Module Interface Troubleshooting A2 1300 There is an open on the motherboard between A22J1 32 and XA17J1 4 5 6 34 35 or 36 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue A2 1301 Install a jumper Then go to the Troubleshooting Foldout block 1 located just pr
66. the first LED that is off and go to the indicated paragraph If all LEDs are on go to A16 1001 aaa Paragraph 40V A16 4200 5VHD A16 9000 22V STBY A16 4300 15V A16 4400 5V A16 4500 5V A16 4600 A16 4700 _ A16 4800 A16 1001 Is the red A16 PRS LED post regulator shutdown on ay Continue Go To A16 9000 A16 1002 Is the red A16 PRA LED post regulator alert on 3 gt g Continue Go To A16 4002 30 A16 A17 A18 Troubleshooting A16 2000 Note ug Measure the power supply voltages in the order given Measure all of the voltages at the test points on the top edge of A16 If a voltage is out of specification go to the paragraph indicated These power supply voltages and tolerances rely on DC voltmeter accuracy of better than 0 5 If your voltmeter is less accurate compensate accordingly Power Supply Nominal Tolerance Go To Name Voltage Paragraph 40V 40 Vdc 40 8 Vdc A16 9000 22V STBY 22 Vde 0 4 Vdc A16 9000 15V 15 07 Vde 0 3Vde A16 9000 5V 5 2 Vdc 01 Vde A16 9000 45V 45 2 Vde 0 4Vde A16 9000 8V 8 Vde 0 2Vde A16 9000 15V 415 12 Vdc 3 0 3Vdc A16 9000 5VHD TTL Hi TTL Hi A17 9000 H4 5VAUp TTL Hi TTL Hi A16 9000 If no errors occur go to Special Cases or restart troubleshooting with ILT 000 A16 A17 A18 Troubleshooting 31 A16 4000 A16 4001 A16 4002 Is the red A16 PRS LED post regulator shutdo
67. were test patches for the diagnostics and attenuator correction data Both sets of data will have to be recreated To recreate the attenuator correction data refer to the performance tests and adjustments For the test patches on the diagnostics refer to the appropriate service or installation notes When the HP IB diagnostic was performed was the HP 8360 series synthesizer disconnected from all HP IB busses a Continue Go To A15 8500 A15 CPU Troubleshooting 23 Ai5 501 Remove all HP IB connections and restart the troubleshooting process A15 1100 Perform the following setup 1 Set the line power switch to STANDBY 2 Completely remove the following assemblies u A4 fractional n s A5 YO loop m A7 reference m AQ pulse m A10 ALC m All FM driver a A12 SYTM driver A13 YO driver w A14 sweep generator 3 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off aq Continue Go To A15 1120 A15 1101 Perform the following setup 1 Set the line power switch to STANDBY 2 Replace all of the assemblies removed in the previous step and reconnect all cables 3 Carefully remove the A6 assembly Be sure to disconnect all flexible and semi rigid coax cables before removing A6 4 Repeat the power on sequency and observe the indicators on A15 24 A15 CPU Troubleshooting A15 1102 A15 1103 Did all the indicators turn on temporar
68. 02 1 Set the line power switch to STANDBY 2 Remove the following assemblies z A4 fractional N m A5 YO phase detector m A7 reference m AQ pulse a Ali FM driver a A12 SYTM driver A16 A17 A18 Troubleshooting 87 Al3 YO driver Al4 sweep generator z Al5 microprocessor 3 Set the line power switch to ON 4 Measure the previously failed voltage q Continue Go To A16 7010 A16 7003 1 Set the line power switch to STANDBY 2 Replace all previously removed assemblies 3 Remove A6 Note i Be sure to disconnect the rigid cable connected to the ES input of A6 before removing A6 Otherwise damage to the cable A6 and possibly the filter FL2 can occur 4 Set the line power switch to ON 5 Measure the previously failed voltage sg Continue Go To A6 9000 A16 7004 Set the line power switch to STANDBY Replace A6 Remove the RF deck Refer to the disassembly and replacement procedures as required 4 Set the line power switch to ON Ge DD em 88 A16 A17 A18 Troubleshooting A16 7005 A16 7006 m ON re oS a I Measure the previously failed voltage aq Continue Go To A16 7028 Set the line power switch to STANDBY Disconnect the instrument from ac line power Replace the RF deck Remove the front panel assembly Refer to the disassembly and replacement procedures as required Disconnect all ribbon cables between the motherboard and the front panel Reconnec
69. 1 to ground SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Go To A16 4830 Continue 74 A16 A17 A18 Troubleshooting A16 4805 Refer to the disassembly procedures and reinstall the RF deck in the service position Remove the ribbon cables that connect the microcircuits to the RF deck Measure the resistance of the 15 Vdc supply to ground XA16J1 30 31 70 and 71 to ground SYNTHESIZER MOTHERBOARD tere nn E A niaagom by lnaocssnannagger re FRONT OF INSTRUMENT Go To A20 9000 Continue A16 4806 Reconnect the microcircuit ribbon cables one at a time while measuring the resistance of the 15 Vdc supply to ground XA1631 30 31 70 and 71 to ground Also check the 15V fuse on A16 H defective replace it Did a microcircuit cause a resistance measurement of lt 10 kQ Go To A16 4808 Continue A16 A17 A18 Troubleshooting 75 A16 4807 Go to the paragraph indicated to replace the faulty microcircuit Microcircuit Go To Paragraph A29 amp filter A28 amp multiplier A26 YO A24 low band A31 attenuator A32 amp doubler A33 amp switch A16 4808 You may have removed the defect in the disassembly process or the problem may be intermittent Also check the 15V fuse on A16 If defective replace it Go to Troubleshooting Foldout block 1 A16 4810 Reinstall the previously removed assemblies one at a time while measuring the resistance of the 15 Vde supply to ground XA16J1
70. 10 Modulator Drive Hi Bnd A10 700 A10 Loop Integrator A10 800 A10 T C Ref Supply A10 9000 A10 Detector Offset DAC A10 9000 A10 Detector x10 Amplifier A10 9000 A10 AM Logger Offset A10 9000 A10 ALC Troubleshooting 1 A10 200 A10 201 4 A10 ALC Troubleshooting Are there any cables connected to the rear front panel ALC input Go To A10 202 Continue Perform the following setup Remove all connections to the external ALC input 1 2 3 4 5 Continue Go To ILT 000 A10 102 There is an open on the motherboard between XA10J2 21 and XA13J2 21 Verify this with an ohmmeter Is jumpering the open an acceptable repair a q Go To A22 9000 Continue A10 103 Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A10 ALC Troubleshooting 3 A10 200 A10 201 4 A10 ALC Troubleshooting Are there any cables connected to the rear front panel ALC input ty Go To A10 202 Continue Perform the following setup Remove all connections to the external ALC input 1 2 Press PRESET SERVICE 3 ea nu 4 5 Continue Go To ILT 006 A10 202 Press cw Sor Disconnect N25 2 to 2 0Vde 4 Sl gt Go g A10 9000 A10 203 Perform the following setup 1 Press PRESET GM Ges 2 Press POWER LEVEL 10 48m 10d8m 248 NE OUTPUT Continue Go To RF 3090 A10 ALC Troubleshooti
71. 2 3 GHz b In step 3 the frequency range is 2 3 to 7 4 GHz c Change the measurement setup illustration to show these differences A6 401 1 For the power measurement a Replace step 3 with the following text Remove W51 connects the mod splitter A25 to FL2 b In step 7 set the synthesizer to 2 3 GHz c In step 8 sweep from 2 3 to 7 4 GHz d In step 9 verify that the power is greater than 22 dBm 2 For the frequency measurement a In step I set the synthesizer to 2 3 GHz b In step 3 the frequency range is 2 3 to 7 4 GHz c Change the measurement setup illustration to show these differences A6 492 1 For the power measurement HP 8360 Change B 2 5 Troubleshooting 2 6 Change B a In step 3 W52 connects the YIG oscillator A26 to the mod splitter A25 b In step 7 set the synthesizer to 2 3 GHz c In step 8 set the power to gt 8 dBm the frequency range is 2 3 to 7 4 GHz 2 For the frequency measurement a In step 1 set the synthesizer to 2 3 GHz b In step 3 the frequency range is 2 3 to 7 4 GHz c Change the measurement setup illustration to show these differences A6 403 If W52 is not defective go to RF 2590 A 6 420 Replace A6 420 with the following text There is a high loss path between the mod splitter A25 and the sampler A6 This path includes two hardlines W54 and W51 and a low pass filter FL2 The most likely failure is a poor conne
72. 22 9000 Continue A4 1327 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A4 Fractional N Troubleshooting 17 A4 1330 A4 1331 A4 1335 A4 1336 A4 1337 There is an open on the motherboard between XA4J2 11 12 41 or 42 and XA7J2 11 12 41 or 42 Verify this with an ohmmeter Is jumpering an acceptable repair ag Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Using an ohmmeter measure the resistance from XA4J1 50 to XA15J1 77 Is the resistance less than or equal to 2 aq Continue Go To A15 9000 There is an open on the motherboard between XA4J1 50 and XA15J1 77 Verify this with an ohmmeter Is jumpering an acceptable repair 1 Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 18 A4 Fractional N Troubleshooting A4 1340 A4 1341 Go To A14 9000 Continue There is an open on the motherboard between XA4J1 2 and XA14J1 5 Verify this with an ohmmeter Is jumpering an acceptable repair ay Go To A22 9000 Continue A4 1342 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A4 Fractional N Troubleshooting 19 A4 9000 Adjustments Required Troubleshooting
73. 30 31 70 and 71 to ground Replace the assembly that causes a resistance measurement of lt 10 kQ If no assembly causes a low resistance measurement you may have removed the defect in the disassembly process or the problem may be intermittent Also check the 15V fuse on A16 If defective replace it Go to Troubleshooting Foldout block 1 76 A16 A17 A18 Troubleshooting A16 4820 A16 4821 Check the 15V fuse on A16 Is the fuse defective ag Go To A16 7000 Continue Do the following 1 Replace the defective fuse 2 Install A16 3 Connect the instrument to line power using an isolation transformer 4 Set the line power switch to ON Is the green 15V LED on Go To A16 7000 Continue Replacing the fuse seems to have fixed the problem but this simple solution is suspect You may want to monitor the instrument for several minutes with the covers on to insure that an intermittent problem does not exist Go to the Troubleshooting Foldout block 1 A16 A17 A18 Troubleshooting 77 A16 4830 A16 4900 Lom InoosagngP KNE En Refer to the disassembly procedures to remove the rear panel and disconnect ribbon cable W31 from the motherboard Measure the resistance of the 15 Vdc supply to ground XA16J1 30 31 70 and 71 to ground SYKTHESIZER MOTHERSOARD ED a KE aR gt FRONT GF INSTRUMENT Go To A22 9000 Go To A19 9000 Do the following 1 Set line power switch t
74. 400 Go To A19 9000 instrument Level Troubleshooting 65 ILT 3730 Check for TTL activity at J8 36 on the motherboard SYNTHESIZER MOTHERBOARD REAR OF INSTRUMENT Continue Go To A19 9000 ILT 3731 Check for TTL activity at XA14P2 37 on the motherboard SYNTHESIZER BOTHERBORAD OSCILLOSCOPE REAR OF INSTRUMENT Go To A14 9000 Continue 66 Instrument Level Troubleshooting ILT 3735 There is an open on the motherboard between A22J8 and XA14J2 37 Verify this with an ohmmeter Is jumpering an acceptable repair ag Go To A22 9000 Continue ILT 3736 Repair the open between J8 36 and XA14P2 37 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab ILT 3740 Check for TTL activity at 38 39 on the motherboard SYNTHESIZER MOTHERBORRO FRONT OF INSTRUMENT Continue Go To A19 9000 instrument Level Troubleshooting 67 ILT 3747 Check for TTL activity at XA14P1 68 on the motherboard GSCILLOSCOPE SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Go To A14 9000 Continue ILT 3745 There is an open on the motherboard Is jumpering an acceptable repair 9 Go To A22 9000 Continue ILT 3746 Repair the open between J8 39 and XA14P1 68 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 68 Instrument Level Troubleshooting ILT 3800 The rear panel HP IB switch controls the instrument language and addres
75. 42 to ground SYNTHESIZER NOTHERROARD YOLTHETER BARD ERBSDAR amp 4 FRONT GF BISTRUMENT Go To A23 9000 Continue Do the following if not already performed 1 Set line power switch to STANDBY 2 Disconnect the instrument from line power 3 Wait for all the indicators in the power supply section to go out A16 A17 A18 Troubleshooting 41 Measure the resistance of the 22Vdc supply to ground XA16J1 43 to ground SYNTHESIZER NOTHERACARO Continue Go To A16 9000 A16 4302 Remove A12 Measure the resistance of 22Vdc to ground XA16J1 43 to ground VOLTMETER SYNTHESIZER MOTHERBOARD Go To A22 9000 Go To A12 9000 42 A16 A17 A18 Troubleshooting A16 4400 A16 4401 Measure the voltage of the 15 Vdc unregulated supply from A17 to A16 at XA16J1 27 28 67 and 68 SYNTHESIZER NOTHERBOARD FRONT OF INSTRUMENT Continue Go To A16 4402 When the instrument is connected to ac line power or the A18 high voltage neon indicator is on there are voltages present that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service on this instrument with its protective covers removed An isolation transformer must be used during all these procedures Observe all safety practices Remove all jewelry metal that can short to ground Do the following 1 Set line power switch to STANDBY 2 Disconnect the instr
76. 5 2 3 4 Turn the line power switch on 5 6 Select 1 7 Press cw 8 Press 2 GHz Use the rotary knob to vary the CW frequency over a range of 2 GHz to 26 5 GHz Measure the power and frequency over this range as shown in the following figure POWER METER TT Disconnect W55 From A33JU Go To RF 2590 Go To RF 2890 Change B 2 15 Special Cases Section In SC 250 Block Diagram Notes make the following changes 1 In the second paragraph change the third and fourth sentences to read Beginning with the YO A26 the signal is passed to the mod splieer A sampled portion of the mod splitter output is fed back through W51 FL2 and W54 to the sampler A6 2 Replace the fourth paragraph with the following one The second ALC loop begins with the bridge detector in the HP 83621A 31A or the coupler detector in the HP 83651A A30 Like band 0 this signal goes to the ALC A10 where it is compared to a reference The difference between the reference and the detector output voltage is used as an error signal This error signal is sent back to the mod splitter A25 where it is used to control the loop gain And finally the level corrected signal out of the mod splitter A25 is amplified A29 frequency multiplied and filtered A28 2 16 Change B HP 8360 Troubleshooting Change A Instrument Level Troubleshooting Section RF Section System Section Special C
77. 6 go to RF 2690 e HET UNLOCK go to RF 2490 4 The microprocessor may cause the fault go to A15 9000 If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem ILT 2695 The diagnostics already performed are probably more accurate than the remaining procedures These procedures may not be able to identify the failed assembly This is particularly true when a specification has only marginally failed Before continuing verify all RF cable connections on the RF deck If no problems are found go to ILT 2240 28 Instrument Level Troubleshooting ILT 2700 ILT 2701 ILT 2710 REAR PANEL otis OUTPUT 10MHz 10Hz Continue Go To ILT 2710 The 10 MHz standard is out of tolerance Perform the 10 MHz Standard adjustment see the Service manual If the 10 MHz output is still out of tolerance after performing the adjustment go to A23 000 and replace the 10 MHz standard assembly If the 10 MHz standard is within tolerance but the CW accuracy is not an undetected failure must also be present Look for unlock indicators and investigate the sampler and fractional N assemblies instrument Level Troubleshooting 29 ILT 3000 RF Out HP 10 MHz Trigger ILT 3010 toggle this a 30 Instrument Level Troubleshooting Failing Input or Output Display Output Keyboard Input
78. 64 HP83651A 32176 Is the synthesizer hardware configuration number correct Go To ILT 7006 Continue ILT 111 Does the synthesizer have a user preset implemented aa Continue Go To ILT 7100 ILT 112 Were self tests run because an adjustment failed Continue Go To ILT 2000 instrument Level Troubleshooting 7 ILT 113 Ifa FAULT message is displayed check the Fault Menu Does a RAMP fault exist aa Continue Go To A14 9000 ILT 114 Perform the following calibration eden DN 3 Wait for the calibration to complete lt 1 minute If the calibration runs without errors continue with ILT 115 Otherwise go to performance tests and adjustments ILT 115 Were self tests run because of a faulty signal at one or more of the 1 0 ports listed below Display Out 10 Mile Ret In Extemal ALC ln Front Panel SMI HPAI Switches at ipl Continue Go To ILT 3000 Auxiliary Int 8 instrument Level Troubleshooting ILT 116 Do all of the following work properly m Power level functions ott o RF on off o a Power sweep i Power slope a Attenuator uncoupling o Up down power size a Setting frequencies start stop CW etc o Up down size o Frequency offset c Frequency multiplier Marker functions m Sweep functions a List o Step m Step size m Step points m Step dwell Step sweep trigger ra a Sweep ramp m Frequency list a Fast sweep time
79. 8 Troubleshooting 3 A16 103 1 Turn the instrument ON and make the following observations during power up m Amber standby light front panel OFF a Green power on light front panel ON u 18 neon high voltage indicator DS2 ON m 18 green 13 6V LED DS1 ON m A18 amber preregulator shutdown LED DS7 OFF m Ail other A18 LEDs OFF 2 Turn the instrument to STANDBY Were all indicators correct and does the instrument still appear safe to operate ap Go To A16 500 Continue A16 104 1 Verify that the line switch is in STANDBY Disconnect the ac line power cord Wait for all the indicators in the power supply section to go out Install A16 Reconnect ac line power through an isolation transformer 6 Observe the amber standby light and the green power on light on the front panel of the instrument Also check the indicators on A16 and A18 Compare their status to the following list u Amber standby light ON a Green power on light OFF m A18 neon high voltage indicator DS2 ON u A18 green 13 6V LED DS1 ON m A18 amber preregulator shutdown LED DS7 ON a Other A18 LEDs OFF a Al6 green 22V standby LED ON Ww NO O gt 4 A16 A17 A18 Troubleshooting A16 105 a Other A16 LEDs OFF Were all indicators correct and does the instrument still appear safe to operate ag Go To A16 600 Continue 1 Turn the line power switch to ON and make the
80. 9000 4 A5 yo Loop Troubleshooting A5 221 A5 222 A5 300 There is an open on the motherboard between XA5J2 22 and XA15J2 24 Verify this with an ohmmeter Is jumpering the open an acceptable repair Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab The instrument may be showing an UNLOCK message If so the keyboard response will be very sluggish This is normal Also the frequency may be somewhat unstable Perform the following key sequence 1 Press PRESET 2 Select Tac Eesti WAA Da x av AAA YO cds 7 a islas A A a D rS ETE AO RAR Gr Aner ro lt i EA La a a pera Disconnect W13 From A5J1 Y A5Jt Continue Go To A5 8500 A5 YO Loop Troubleshooting 5 A5 301 A5 302 A5 400 From A6J2 10dBm to 10dBm Go To A6 9000 Go To A5 302 Replace W13 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Perform the following key sequence 1 Press PRESET SERVICE ANI AN 2 Select Selft 3 Press 51 ENTER E TN f ve O 4 Select Loop ast Prev cr K eraan Wield ANS A e 6 A5 YO Loop Troubleshooting Disconnect Wi3 Note that this TTL signal cycles about every one to three seconds It is a low duty cycle low frequency signal that is difficult to see Go To A5 410 Continu
81. A E WHPOL g iSi DAA A na Mark TI ET INT i D UTA ED ADA Mirat ret ae SVR 2030058 ONY MIYAGI F wy LOBO WEPEE DE Lim NINO VIS 112388 OSVOBSIHLOME i ZZY 0 9 St Gi Oi i 130 18 18 THO SAGES GEPRE CHIFF N OU URPO THIOTA HIO RS VHd re oreo i LSA i FGM l 6 EROSIE EE 8 Git A LAGLNO dA iP E WAPLE bs Hand WA i SNY BZV 3 I 3 i 130 I J a 390m8 osv AA A GILINdS GON GSV EE GEM SKARD it Hah SIAI CA E a bee me av av hla Thd 3 2 3 1 r gt i CAS A MARA A A UR E A CNY 333 i EE MOAYNNGLLY 7 Po DENE SON 2H A QA PGS HIRR OA SLY HOHE 2HB AGEL QA pm gt E a i dr lt i A some 4D SD str OPS Ke AAN Tht 0384 37 z AGUVOEUSHIOW in ge I i cov 0 S vo a a MIAO HILUTI ITON GULV EE GENE CRD GE FAA GEN MER 357 38d XI ay n Sa OY rY OL SIYOdY Five UIT GIY 1803 MOT PE dite je ll PUPP dn ALZ l a i E HINNA AB NYa 938NN Agt H SINN AR SIYEN AQF 13NYe INOM PE ee WS zy SON DINA AFL NV Yv38 lithe i Div gy yr ov 7 UV SANN SMUVES DIBNN VAT G 54 ange gt wHPSE Oh Li ara Le a i sf IHMOP 5 1 HOOT ME av OL 4 E
82. A1 Front Panel Keyboard Troubleshooting 1 A1 9000 Replace the Al assembly i Adjustments NS Required gt Troubleshooting Foldout Biock 1 Perform Adjustments Located in front of the Special Cases tab Adjustments Successful 2 Ai Front Panel Keyboard Troubleshooting A2 Source Module Interface Troubleshooting A2 000 Message Displayed on Synthesizer Go to Paragraph A2 LED Control Latch A2 100 A2 SMI Control Latch A2 200 A2 SMI Sensing Circuit A2 8000 A2 Source Module Interface Troubleshooting 1 A2 100 A22J1 is located at the very front of the instrument on the motherboard Early versions of the A22J1 motherboard pins may be mislabeled The square pad correctly indicates pin 1 SYNTHESIZER MOTHERBOARD la gannanunn os i sanas OS eneupesnanenes Go To A2 1300 Continue A2 101 Loop self test ane 1 2 aif 3 Press 232 da Gu 4 Loop D 2 A2 Source Module Interface Troubieshooting A2 103 SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT a Go To A2 1305 Continue Loop self test 233 rr 3 Press 233 ENTER A a T RIAD a elect Loop ast S 8 tet y AED A en nce Lorn i reise at Sac ect rr AA ee Check all signals listed below for TTL pulses at A22J1 A22J1 is located at the very front of the instrument on the motherboard Early versions of the A22J1 motherboard pins may be mislabeled The
83. A15 ROM Tests A15 400 A15 HPIB Interface Chips A15 500 A15 ADC Circuitry A15 9000 A15 uProcessor Test A15 9000 A15 Peripheral Timers A15 9000 A15 RAM Tests A15 9000 A15 CPU Troubleshooting 1 A15 100 A15 101 2 A15 CPU Troubleshooting Perform the following setup 1 Set the line power switch to STANDBY 2 Completely remove the following assemblies a A4 fractional N mw AS YO loop nm reference u A9 pulse a A10 ALC s All FM driver s A12 SY TM driver s A13 YO driver x Al4 sweep generator 3 Set the line power switch to ON 4 Press ERESET SERVICE 5 Select Self i 6 Press 231 En D T Select Bi 231 Pe Go Y A15 120 Perform the following setup 1 Set the line power switch to STANDBY 2 Replace all of the assemblies removed in the previous step and reconnect all cables 3 Carefully remove the A6 assembly Be sure to disconnect all flexible and semi rigid coax cables before removing A6 4 Set the line power switch to ON 5 Press 6 Select a 7 Press ENTER Continue Go To A6 9000 A15 102 Perform the following setup 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Replace the A6 assembly removed in the previous step and reconnect all cables 5 Using the disassembly instructions remove the front panel and disconnect W2 the ribbon cable that
84. A15 255 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A6 and A7 assemblies Go To A15 8500 Perform the following 1 Set the line power switch to STANDBY Replace the A7 assembly Set the line power switch to ON Press CEDG Ed ete Go To A7 9000 Go To A6 9000 Perform the following Set the line power switch to STANDBY Remove the A4 and A5 assemblies Set the line power switch to ON Press Pi ot GO ND tas A15 261 A15 265 A15 270 6 Press 232 E 7 Select De Continue Go To A15 265 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A4 and A5 assemblies Go To A15 8500 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A4 assembly 3 Set the line power switch to ON 4 Press SERVICE 5 Select A y Go To A4 9000 Go To A5 9000 Perform the following 1 Set the line power switch to STANDBY 2 Using the disassembly instructions carefully remove the RF deck 3 Set the line power switch to ON 4 Press PRESET SERVICE A15 CPU Troubleshooting 13 A15 271 A15 280 14 A15 CPU Troubleshooting Continue Go To A20 9000 Perform the following A 2 Set the line power switch to STANDBY Replace the A20 assembly Go To A15 8500 Perform the following setup 1 2 3 Set the line power switch to STANDBY Disconnect the li
85. A16 9000 However some chance exists that A17 is unable to supply sufficient current If replacing A16 does not solve the problem then replace A17 go to A17 9000 Then gt go to Troubleshooting Foldout block 1 e 86 A16 A17 A18 Troubleshooting EEE gt K kE A _ AA A AA A16 7000 The most probable fault is A16 However some chance exists that the supply in question could be loaded by an assembly only when power is applied If you suspect this type of loading continue with A16 7001 otherwise go to A16 9000 A16 7001 The following is a general procedure You will have to adapt this procedure to your own situation If you are unsure how to proceed or you have questions about safety do not continue with this procedure Instead refer the instrument to qualified service personnel Warning Y When the instrument is connected to ac line power or the A18 high voltage neon indicator is on there are voltages present that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service on this instrument with its protective covers removed An isolation transformer must be used during all these procedures Observe all safety practices Remove all jewelry metal that can short to ground The power supply interconnect tables located in Special Cases are useful in determining where to make your measurements Continue with A16 7002 A16 70
86. A19 101 Loop self test 232 1 Press inan A V Cobain 2 Select 3 Press ENTER e r dra e 2 A19 Rear Panel Interface Troubleshooting A19 100 The A22J8 connector is located at the back of the SYNTHESIZER MOTHERBOARD BACK OF INSTRUMENT Go To A19 1305 Continue A19 102 Loop self test 233 Go To A19 1310 Continue A19 Rear Panel Interface Troubieshooting A19 103 Loop self test 231 1 Press SERVICE 2 Select 3 3 Press 4 Select Signal Location A22J8 57 A22J8 58 A2238 55 A22J8 56 A22J8 54 H one or more signals do not have TTL pulses the test has failed If all signals have TTL pulses the test has passed Go To A19 1315 Go To A19 8000 4 A19 Rear Panel Interface Troubleshooting A19 200 Loop self test 233 AA a a Ere AA 9 Atm tn hte tt ms 4 Select 1 Geri Signal Location A2258 52 A22J8 51 A2238 50 A22J8 49 A2238 48 A2258 47 A2238 46 A2238 45 If one or more signals do not have TTL pulses the test has failed If all signals have TTL pulses the test has passed Go To A19 1320 Go To A19 8000 A19 Rear Panel interface Troubleshooting 5 A19 300 Go To A19 1325 Continue A19 301 VOL TAE TERM SYNTHESIZER MOTHERBOARD BACK OF INSTRUMENT Go To A19 1330 Go To A19 8000 6 A19 Rear Panel Interface Troubleshooting A19 1300 A ata 2 F
87. A6 9000 Perform the following setup Set the line power switch to STANDBY Disconnect the line power cord Wait for all the indicators in the power supply section to go out Replace the A6 assembly removed in the previous step and reconnect all cables Using the disassembly instructions remove the front panel and disconnect W2 the ribbon cable that connects the motherboard to A2 Temporarily replace the front panel leaving the ribbon cable loose Reconnect line power the power on control is on A2 so the synthesizer will power up automatically even in standby and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off au Continue Go To A2 9000 A15 CPU Troubleshooting 41 A15 1403 Warning A15 1404 42 A15 CPU Troubleshooting Perform the following setup 1 Disconnect the line power cord 2 Wait for all the indicators in the power supply section to go out 3 Remove the front panel 4 Reconnect W2 to A2 5 Disconnect W3 the ribbon cable that connects A3 to the motherboard 6 Temporarily replace the front panel leaving the ribbon cable loose 7 Reconnect the line power cord 8 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off aq Continue Go To A3 9000 When the instrument is connected to ac line power or the A18 high voltage neon indicator i
88. ARD on FRONT OF INSTRUMENT Continue Go To A15 9000 RF 406 There is an open on the motherboard between XA20J1 55 and XA15J1 80 Verify this with an ohmmeter Is jumpering the open an acceptable repair Go To A22 9000 Continue RF 407 Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 6 RF Troubleshooting EEE vm RF 500 Check the ribbon cable that connects the amplifier multiplier A28 to the RF interface board A20 If it is loose reseat the cable Correct any other obvious faults Perform the following test 1 Press PRESET GEO 3 Press ENTER 4 Select 1 l aea If the test fails go to RF 2890 Otherwise go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab RF Troubleshooting 7 RF 600 8 RF Troubleshooting ange Check the ribbon cable that connects the amplifier filter A29 to the RF interface board A20 If it is loose reseat the cable Correct any other obvious faults Perform the following test 1 Press CREED ERT 2 Select Se 4 Select De If the test fails go to RF 2990 Otherwise go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab TOE L T RF 700 Using the disassembly and replacement procedures lift the RF deck into the service position Check the ribbon cable that connects the doubler A32 to the
89. Driver Troubleshooting A13 300 Perform the ke key sequence gt When comparing the oscilloscope waveform to the one shown the amplitude of the pulses is important the timing is not aan SYNTHESIZER MOTHERROARO Continue Go To A13 9000 A13 YO Driver Troubleshooting 7 A13 301 When comparing the oscilloscope waveform to the one shown the amplitude of the pulses is important the timing is not Go To A14 9000 Continue A13 302 There is an open on the motherboard between XA13J2 50 and XA14J2 57 Verify this with an ohmmeter Is jumpering the open an acceptable repair aq Go To A22 9000 Continue A13 303 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 8 A13 YO Driver Troubleshooting A13 400 Perform the following key sequence FRONT OF INSTRUMENT P A dy Continue Go To A13 9000 A13 YO Driver Troubleshooting 9 A13 401 SYMTHESIZER MOTHERBORRO Go To A14 9000 Continue A13 402 There is an open on the motherboard between XA13J2 35 and XA14J2 42 Verify this with an E ohmmeter Is jumpering the open an acceptable repair ag Go To A22 9000 Continue A13 403 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 10 A13 YO Driver Troubleshooting A13 500 Perform the following key sequence 1 Press 2 Select Selftes
90. Exceeding this length may lock up the data bus 2 The rear panel SMI A19 The CPU assembly A15 4 The ribbon cable W23 connects A19 to motherboard 5 There is a remote possibility of a motherboard A22 fault Ww If these alternatives do not fix the problem consult Special Cases to troubleshoot this problem ILT 3100 Check the continuity from the rear panel 10 MHz input to the end of W16 connects to A7J1 DIGITAL VOLTHETER 10MHz INPUT Hd W16 AN Continue Go To ILT 3102 40 Instrument Level Troubleshooting ILT 3101 Replace W16 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab ILT 3102 OdBM to 10dBm Disconnect the ext ref from the rear panel 10MHz REF IN PUT aaa INPUT Continue Go To A7 9000 ILT 3103 Correct the reference into the rear panel If a problem still exists refer to the instrument block diagram located at the end of Special Cases to troubleshoot this problem instrument Level Troubleshooting 41 ILT 3110 ILT 3111 REAR PANEL 10MHz OUTPUT NI I 4 Go To ILT 3112 Continue There does not seem to be a failure The rear panel output should be 10 MHz at approximately 0 dBm If a problem still exists refer to the instrument block diagram located at the end of Special Cases to troubleshoot this problem 42 Instrument Level Troubleshooting ILT 3112 ILT 3113 ILT
91. Foldout block 1 located just prior to the Special Cases tab 10 A7 Reference Troubleshooting EEE nn 5 A7 400 Loop self test EE A7 401 Check for a TTL signal with a period of 1 5 to 3 0 seconds SYNTHESIZER MOTHERNCARO FRONT OF INSTRUMENT Go To A7 9000 Go To A7 1340 A7 Reference Troubleshooting 11 A7 500 Are you using an external standard Go To A7 520 Continue A7 501 1047 14 Continue Go To A7 503 A7 502 The external standard is faulty Correct the external reference see instrument specifications and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 12 A7 Reference Troubleshooting A7 503 Disconnect WIG From A7J FREQUENCY COUNTER li Continue Go To A7 505 A7 504 Replace W16 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A7 505 VOLTMETER SYNTHESIZER NGTHERRGARD FRONT OF INSTRUMENT wi Go To A7 9000 Go To A7 1345 A7 Reference Troubleshooting 13 A7 520 LEK KJELE Be a FRONT OF INSTRUMENT Go To A7 9000 Go To A7 1346 14 A7 Reference Troubleshooting A7 1300 A7 1301 A7 1302 ero re MM dot t 2 205 e A TELENETTET EE Go To A16 9000 Continue There is an open on the motherboard between XA7J1 43 and XA16J1 76 Verify this with an ohmmeter Is jumpering an acceptable repair ag Go To A22 9000 C
92. Go To A14 9000 A14 401 Do the following 1 Ensure the instrument is still disconnected from line power 2 Remove A14 3 Measure the resistance between XA14J1 78 and ground gt 10 kQ 8 A14 Sweep Generator Troubleshooting VOL TNETER SYNTHESIZER MOTHERSORRO Continue Go To A14 9000 A14 402 Do the following 1 Ensure the instrument is still disconnected from line a power 2 Remove the rear panel 3 Disconnect the ribbon cable connecting A19 to the motherboard W31 4 Measure the resistance between XA14J1 78 and ground gt 10 kQ VOL TNETER SYNTHESIZER MOTHERBOARD Go To A22 9000 Go To A19 9000 A14 Sweep Generator Troubleshooting 9 A14 500 Are all cables removed from the synthesizer including the VSWP connection aq Continue Go To A14 9000 A14 501 Remove all cables and go to ILT 105 10 A14 Sweep Generator Troubleshooting A14 9000 Replace the Al4 assembly Adjustments Required Troubleshooting Perform Foldout x Adjustments Block 1 Located in front of the Special Cases tab Adjustments Successful A14 Sweep GeneratorTroubleshooting 11 mmm mmo ASEELLE nos SS en Rae tet ee DEANN o miro ene MIE II e IA ent A15 CPU Troubleshooting A15 000 Message Displayed on Synthesizer Go to Paragraph A15 I O Address A15 100 A15 I O Strobe A15 200 A15 1 0 Data A15 300
93. Go To A15 9000 Continue A13 YO Driver Troubleshooting 3 A13 103 There is an open on the motherboard between XA13J1 26 and XA15J1 44 Verify this with an ohmmeter Is jumpering the open an acceptable repair aq Go To A22 9000 Continue A13 104 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A13 120 One of the following assemblies is defective A10 ALC A12 SY TM Driver A14 Sweep Generator Replace any one of the assemblies and perform the following test 4 Select D T If the test fails the iy just replaced is defective If the test does not fail replace another assembly and repeat test number 182 When the defective assembly is identified go to the 9000 paragraph for that assembly for replacement instructions For example for A10 go to A10 9000 for A12 go to A12 9000 and so on 4 A13 YO Driver Troubleshooting A13 200 Perform the following key sequence Press Select FRONT OF INSTRUMENT Ji l Continue Go To A13 9000 A13 YO Driver Troubleshooting 5 A13 201 A13 202 A13 203 A Go To A14 9000 Continue There is an open on the motherboard between XA13J1 49 and XA14J1 67 Verify this with an ohmmeter Is jumpering the open an acceptable repair gallen Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 6 A13 YO
94. HP 83621A 31A 51A Synthesized Sweepers Troubleshooting Manual SERIAL NUMBERS This manual applies to any synthesized sweeper with the following model number and serial number prefix combinations You may have to modify this manual so that it applies directly to your instrument version Refer to the Instrument History chapter HP 83621A 31A HP 83651A 3317A 3317A 32454 32454 32134 3213A 3143A 3143A 3139A 3137A 3137A 3044A 3104A i 3108A 3103A o i woe so Agilent Technologies HP Part No 08360 90048 Printed in USA April 1993 Edition 4 pre mes OS IN o A see Po o tte S OPSA geeen vaneen em tetett cm serete tarer tenes Pane ee rre pernos fa z AS Certification Hewlett Packard Company certifies that this product met its published 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 NIST formerly NBS to the extent allowed by the Institute s calibration facility and to the calibration facilities of other International Standards Organization members Warranty This Hewlett Packard instrument product is warranted against defects in material and workmanship for a period of one year from date of delivery During the warranty period Hewlett Packard Company will at its option e
95. L T 7604 ILT 7605 Measure at the center pin at each end of the cable REAR PANEL SMI CONNECTOR wid amp s Og 2 a Replace the cable W10 that connects the front panel SMI input to the A10 assembly and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Continue Go To ILT 7604 An SMI or ALC connection does not seem to be a problem Go to paragraph ILT 7800 Either the front panel SMI A2 or the ribbon cable W10 is faulty Inspect the ribbon cable Replace the A2 assembly go to A2 9000 or replace W10 as required and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab instrument Level Troubleshooting 85 ILT 7700 Using either an oscilloscope or a voltmeter check the following voltages at the rear panel SMI connector Location Did all voltages pass ag Go To A19 9000 Continue ILT 7701 Perform the following setup m Press PRESET m Press ED Using an oscilloscope or a voltmeter check the following voltages on the rear panel SMI connector Note that pin 12 is a sweep ramp To adjust the sweep time use the front panel controls if you use an oscilloscope try a sweep time of approximately 100 ms Location Measurement 0 to 10V Sweep Ramp 86 Instrument Level Troubleshooting Did all voltages pass ay Go To ILT 7705 Continue ILT 7702 Measure at the center p
96. N and the top cover removed check the A16 power supply LEDs in the order given Choose the first LED that is off and go to the indicated paragraph If all LEDs are on go to A16 9000 _Paragraph A16 4200 A16 9000 A 16 4300 A16 4400 A16 4500 A16 4600 A16 4700 A16 4800 34 A16 A17 A18 Troubleshooting A16 4200 Measure the 40 Vdc unregulated supply at XA16J1 23 and 63 SYNTHESIZER MOTHERRGARD FRONT OF INSTRUMENT Continue Go To A16 4202 A16 4201 Do the following 1 Set line power switch to STANDBY 2 Disconnect the instrument from line power 3 Wait for all the indicators in the power supply section to go out 4 Remove A16 A16 A17 A18 Troubleshooting 35 Measure the 40 Vde unregulated supply from A17 to A16 at XA16J1 23 and 63 SYNTHESIZER MOTHERBOARD 42 to 50Vde FRONT OF INSTRUMENT Go To A17 9000 Continue A16 4202 Do the following if not already performed 1 Set line power switch to STANDBY 2 Disconnect the instrument from line power 3 Wait for all the indicators in the power supply section to go out 4 Remove A16 36 A16 A17 A18 Troubleshooting A16 4203 Measure the resistance of the 40 Vdc supply to ground XA16J1 62 to ground VOLTHETER SYKTHESKZER H THERGGARD agaaa gt CORFO RRA AA e Continue Go To A16 4220 Remove the following assemblies Ali FM driver u A12 SYTM driver s A13 YO driver a A14 sweep generat
97. NT Continue Perform the following key sequence Verify a signal of lt 700 mV However expect some portions of the signal to rise to levels of up to 15 Vde This is not a failure as long as the signal is primarily lt 700 mV 2 A6 Sampler Troubleshooting OSCILLOSCOPE SYNTHESIZER MOTHERBOARD 26 23 FRONT OF INSTRUMENT e q Go To A6 9000 Go To A6 120 A6 110 SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT A A Go To A15 9000 Continue A6 Sampler Troubleshooting 3 A6 111 There is an open on the motherboard between XA6J1 26 and XA15J1 42 Verify this with an ohmmeter Is jumpering the open an acceptable repair aq Go To A22 9000 Continue A6 112 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A6 120 Verify a signal of lt 700 mV However expect some portions of the signal to rise to levels of up to 15 Vdc This is not a failure as long as the signal is primarily lt 700 mV OSCILLOSCOPE SYNTHESIZER NOTHERBORAD FRONT OF INSTRUMENT Continue Go To A15 9000 4 AG Sampler Troubleshooting A6 121 There is an open on the motherboard between XA6J1 23 and XA15J1 25 Verify this with an ohmmeter Is jumpering the open an acceptable repair Go To A22 9000 Continue A6 122 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A6 Sampler Troubleshoo
98. NT OF INSTRUMENT Go To A20 9000 Continue A16 4706 Reconnect the microcircuit ribbon cables one at a time while measuring the resistance of the 8 Vdc supply to ground XA16J1 7 8 47 and 48 to ground Also check the 8V fuse on A16 If defective replace it Did a microcircuit cause a resistance measurement lt 10 kQ E Go To A16 4708 Continue 68 A16 A17 A18 Troubleshooting A16 4707 Go to the paragraph indicated to replace the faulty microcircuit Microcircuit Go To Paragraph A29 amp filter RF 2990 A28 amp multiplier RF 2890 A26 YO A24 low band A31 attenuator A32 amp doubler A33 amp switch A16 4708 You may have removed the defect in the disassembly process or the problem may be intermittent Also check the 8V fuse on A16 Replace it if defective Go to the Troubleshooting Foldout block 1 A16 4710 Reinstall the previously removed assemblies one at a time while measuring the resistance of the 8 Vdc supply to ground XA16J1 7 8 47 and 48 to ground Replace the assembly that causes a resistance measurement of lt 10 kQ If no assembly causes a low resistance measurement you may have removed the defect in the disassembly process or the problem may be intermittent Also check the 8V fuse on A16 If defective replace it Go to the Troubleshooting Foldout block 1 A16 A17 A18 Troubleshooting 69 A16 4720 Check the 8V fuse on A16 Is the fuse defective Go
99. OnRRMBeHte oransa e bog LILLE ETNE TE FRONT OF INSTRUMENT Go To A16 9000 Continue A19 1301 There is an open on the motherboard between A22J8 42 and A16J 39 40 79 or 80 Verify this with an ohmmeter Is jumpering an acceptable repair ay Go To A22 9000 Continue A19 1302 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A19 Rear Panel Interface Troubleshooting 7 A19 1305 A19 1306 A19 1307 Go To A15 9000 Continue There is an open on the motherboard between A22J8 60 and XA15J1 44 Verify this with an ohmmeter Is jumpering an acceptable repair g Go To A22 9000 Continue Instali a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 8 A19 Rear Panel interface Troubleshooting A19 1310 Go To A15 9000 Continue A19 1311 There is an open on the motherboard between A22J8 49 and XA15J1 53 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue A19 1312 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Ai9 Rear Panel Interface Troubleshooting 9 A19 1315 Check the following locations for TTL activity Location XA15J1 7 XA15J1 47 XA15J1 9 XA15J1 49 XA15J1 10 If one or more signals do not have TTL pulses the test has failed If all signals have TTL pu
100. RF interface board A20 If it is loose reseat the cable Correct any other obvious physical faults Perform the following test 1 Press PRESET O 2 Select s 3 Press D EATER 4 Select 1 If the test fails go to RF 3290 Otherwise go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab RF Troubleshooting 9 RF 800 RF 801 10 RF Troubleshooting Using the disassembly and replacement procedures lift the RF deck into the service position Check the ribbon cable that connects the low band assembly A24 to the RF interface board A20 If it is loose reseat the cable Correct any other obvious physical faults L Press GERVICE 2 Select S 3 Press ENTER 4 Select D ap Continue Go To RF 805 Do the following Set the line power switch to STANDBY Disconnect W50 from A41 Set the line power switch to ON Press Select T Press cw Press 10 mhz Use the RPG knob to vary the CW frequency over a range of 10 MHz to 1 99 GHz Measure the power and frequency over this range as shown in the following figure ID TOG GW NO re Diode Switch ap At D Disconnect W50 From A414 M to 7 396Hz Go Ki RF 4190 ha RF 802 Do the following 1 Reconnect W50 to A41 2 Press cw 3 Measure the DC voltage at 100 MHz 500 MHz 1 GHz and 2 GHz DIGITAL VOLTAETER Sp bis aa 0 2 to w From Lo
101. Troubleshooting Foldout block 1 located just prior to the Special Cases tab A16 A17 A18 Troubleshooting 63 A16 4630 Refer to the disassembly procedures to remove the rear panel and disconnect ribbon cable W31 from the motherboard Measure the resistance of the 5 Vde supply to ground XA16J1 13 14 39 40 53 54 79 and 80 to ground SYNTHESIZER MOTHERBOARD DUI acsons QORI faa anageaseoaese VPY gt 730 FRONE OF INSTRUMENT Go To A22 9000 Go To A19 9000 A16 4700 Measure the voltage of the 8 Vde unregulated supply from A17 to A16 at XA16J1 9 10 49 and 50 SYNTHESSZER MOTHERBOARO rev Aaaa ig ANAnnassn I WER EEE ETR fasacaono vans na 9 to 20Vdc FRONT OF INSTRUMENT Continue Go To A16 4702 64 A16 A17 A18 Troubleshooting A16 4701 Do the following 6 Set line power switch to STANDBY Disconnect the instrument from line power Wait for all the indicators in the power supply section to go out Remove A16 Connect the instrument to line power using an isolation transformer Set the line power switch to ON Measure the voltage of the 8 Vdc unregulated supply from A17 to A16 at XA16J1 9 10 49 and 50 SYNTHESIZER MOTHERBOARM 9 to 20Vde Go To A17 9000 Continue A16 4702 Do the following if not already performed Set line power switch to STANDBY Disconnect the instrument from line power Wait for al
102. U Troubleshooting Did all the indicators turn on temporarily and then turn off Go To A9 9000 Go To A10 9000 Perform the following setup 1 Set the line power switch to STANDBY 2 Remove the A7 assembly 3 Carefully remove the A6 assembly Be sure to disconnect all cables 4 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off a Continue Go To A15 1355 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A6 and AT assemblies Go To A15 8500 Perform the following setup 1 Set the line power switch to STANDBY 2 Replace the A7 assembly 3 Repeat the power on sequence and observe the indicators on A15 A15 1360 A15 1361 A15 1365 Did all the indicators turn on temporarily and then turn g Go To A7 9000 Go To A6 9000 Perform the following setup 1 Set the line power switch to STANDBY 2 Remove the A4 and A5 assemblies 3 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off Continue Go To A15 1365 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A4 and A5 assemblies Go To A15 8500 Perform the following setup 1 Set the line power switch to STANDBY 2 Replace the A4 assembly 3 Repeat the power on sequence and observe the indicators on A15 A15 CPU Troubles
103. a ae ee A17 9000 Replace the A17 assembly and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A17 and A18 are never completely isolated If replacing A17 does not resolve your problem try replacing A18 A17 Rectifier Filter Replacement 1 rro nn bb tm dd eee mmm renee Estes emer eaten enero r r vanen nb A18 Preregulator Replacement PA NE TNS TS A 18 000 if you think the problem with your instrument may originate on the A18 assembly go to Instrument Level Troubleshooting SU FTTJ e A18 9000 Replace the A18 assembly and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A17 and A18 are never completely isolated If replacing A18 does not resolve your problem try replacing A17 A18 Preregulator Replacement 1 re ACIDOS AAC cn men me Pernia eeemene yong eee A19 Rear Panel Interface Troubleshooting ES A19 000 Message Displayed on Synthesizer Go to Paragraph A19 Control Latch A19 100 A19 SMI Control Latch A19 200 A19 SMI Sensing Circuit A19 300 A19 Switched STD Supply A19 9000 A19 Rear Panel interface Troubleshooting 1 motherboard VOLTMETER SYNTHESIZER NOTHERSORAD GF INSTRUMENT Mayos EE pany aanng Go To A19 1300 Continue
104. a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab AS Pulse Troubleshooting 11 o Perform the following key sequence 1 Press PRESET SERVICE A9 400 ry nem Corwen ri a re rara Pears nn 9000 SYNTHESIZER ACTHERBOARD To A9 Fr tip zr my 19 isk on DC COUPLES Go aster E aH mue Cont 12 A9 Pulse Troubleshooting A9 401 FRONT OF INSTRUMENT Go To A14 9000 Continue A9 402 There is an open on the motherboard between XA9J1 1 and XA14J1 4 Verify this with an ohmmeter Is jumpering the open an acceptable repair ag Go To A22 9000 Continue A9 403 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A9 Pulse Troubleshooting 13 A9 9000 Replace the A9 assembly Adjustments Required Troubleshooting Foldout Block 1 Perform Adjustments Located in front of the Special Cases tab Adjustments Successful 14 A9 Pulse Troubleshooting Taai A10 ALC Troubleshooting EEE A 10 000 Message Displayed on Synthesizer Go to Paragraph A10 10VF Supply A10 100 A10 Meter Log Amplifier A10 200 A10 ALC Reference A10 300 A10 Detector Log Amplifier A10 400 A10 Source Module Intfc A10 500 A10 Unleveled Detectors A10 600 A10 Modulator Drive Lo Bnd A10 700 A
105. a small chance that the failure is A20 the RF interface assembly or W52 the cable that connects A25 the modulator splitter to A26 the YO Has mod splitter A25 been replaced Continue Go To A20 9000 RF 2591 New add after RF 2590 Following the disassembly and replacement procedures replace the mod splitter A25 Then perform the appropriate adjustments and performance tests and restart troubleshooting RF 2990 Change the AM modulator to the amp multiplier A28 RF 4190 Delete this paragraph Change B 2 9 SYS Troubleshooting 2 10 Change B Section SYS 000 1 Delete HP 83651A from the following message SYS YTM Tracking HP 83651A SYS 600 oo 2 Delete the following message La a SYS YTM Tracking HP 83621A 31A SYS 650 SYS 110 In step 1 change directional coupler A39 to mod splitter A25 SYS 400 New add after SYS 300 1 Check W32 A20J3 to A25J3 for poor connection or damage 2 Reseat the pulse board A9 3 Replace the pulse board A9 or the mod splitter microcircuit A25 SYS 500 1 In step 1 replace the A38 AM modulator with the A25 mod splitter 2 In step 2 perform the mod splitter and the ALC adjustments 3 In step 3 replace the AM modulator with the mod splitter SYS 600 through SYS 655 Delete these sections SYS 600 New add after SYS 500 Perform the following setup 1 Set the power switch to standby 2 Reco
106. aq Continue Go To ILT 6800 Since these tests could not isolate the problem go to Special Cases and continue troubleshooting The most likely cause for this failure is the display A21 9000 but the front panel microprocessor assembly A3 9000 could also be at fault If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem 74 Instrument Level Troubleshooting ILT 6805 IL T 6806 ILT 6810 Perform the following 1 Set the line power switch to STANDBY 2 Remove the front panel refer to the disassembly procedures as needed Reseat all ribbon cables on the front panel 4 Reseat all ribbon cables connecting the front panel to the motherboard 5 Replace the front panel on the instrument 6 Set the line power switch to ON ws Is the keyboard or display problem still present a 3 Continue Go To ILT 6810 The problem has apparently been solved by reseating the cables and reassembling the front panel Restart troubleshooting at ILT 000 Do the following 1 Turn the line power switch to ON 2 Check the indicators on the top edge of A16 for the following a Check that all eight green indicators are on b Check that all red indicators are off Are all A16 indicators correct Go e ILT 6860 K l instrument Level Troubleshooting 75 ILT 6860 mn 13 0 to THESIZER MOTHERBOARD OPT A
107. ases HP 8360 Troubleshooting Section HP 83621A 31A instruments with serial prefix 3137A and lower use a DC blocking capacitor A36 and a coupler detector rather than the bridge detector A30 Make the following changes to the Troubleshooting manual 1 In the following paragraphs replace the words bridge detector with coupler detector 1LT 2255 ILT 2256 ILT 2257 2 In paragraph ILT 2255 add the following as item 10 The DC blocking capacitor RF 3690 HP 83621A 31A only 1 Replace RF 3090 with the following The detector CR1 part of A30 has failed Replace it and its bias board together The directional coupler rarely fails however replace it at this time also only if it has failed 2 Add the following RF 3690 Replace the DC blocking cap A36 using the disassembly and replacement procedures Perform the appropriate adjustments and restart troubleshooting Rewrite item 3 in paragraph SYS 606 to read as follows Remove the hard line which connects to the input of the coupler detector A30 In the last paragraph of SC 230 delete the reference to the HP 83651A This information applies to all models Change A 2 17 erre mens A me y APP Pon ons Poona eaten crees II AS i Ctr Thy OL q wed SFIO ol il vivo eet FOV Ald IS YIM EE LEFTY 339 150 MN AT et dk ee pa AS a e e a
108. ases tab 10 A20 RF Interface Troubleshooting A20 9000 Replace the A20 assembly Adjustments Required Troubleshooting Perform Foldout Adjustments Block 1 xLocated in front of the Special Cases tab Adjustments Successful A20 RF Interface Troubleshooting 11 ENTEN NIETO PENNE EE Peete Pa ard and Prsnshrsnmenmenenmemnenes seeren serorea uvenenadnnedun arenas meerdere serde Gunenanan m uvenenennen Vansenenenssdasdasm mra svsmb ressm rmmeressmmmmenennen AA IE III brea er III errar at EL ETE OREO EET LOE E Da Paik aet eek eat enel ab end ennnnennnnnnnet meg 2920 2 227209009009 foe A21 Display Troubleshooting AG SEG SE SN A21 000 When the full self tests are run from the service menu the display test is not run Only the display to A3 interface is tested To test the display run the following test Perform the following key sequence You will see a fast moving cursor moving from side to side and line to line and a walking character set on each line In this way you can check each segment and the display s logic in presenting the characters To exit the test press PRESET If the message POWER SUPPLY FAILURE or CHECK INSTRUMENT appears on the display this is a sign that the front panel processor A3 was not able to communicate with the main processor A15 In this case the display is not at fault Go to ILT 000 A21 D
109. ated just prior to the Special Cases tab 8 A12 Multiplier Filter Driver Troubleshooting A 12 400 Do the following 1 Set power switch to STANDBY 2 Disconnect the power cord 3 Measure the resistance of the YTM tuning coil from XA12J2 14 to XA12J2 60 SYKTHESIZER MOTHERBOARD ay 60 g mm XA12J2 FRONT OF INSTRUMENT Continue Go To A12 9000 VOLTHETER A12 401 Was the resistance lt 350 ay Go To A12 410 Continue A12 402 Do the following 1 Remove A12 2 Measure the resistance of the SYTM tuning coil from XA12J2 14 to XA12J2 60 A12 Multiplier Filter Driver Troubleshooting 9 SYNTHESIZER HOTHERBUARE 35 TO 650 FRONT OF INSTRUMENT Continue Go To A12 9000 A12 403 Do the following a Disconnect W37 from A28J1 ribbon cable connecting RF interface to amp multiplier m Check for an open circuit between XA12J2 14 and XA12J2 60 gt 100 kQ SYNTHESIZER HOTHERGOARD VOLTHETER MI manana ananRA TaBoAnR ARKH 2 100KQ FRONT OF INSTRUMENT iG A 5 Continue Go To RF 2890 10 A12 Multiplier Filter Driver Troubleshooting A12 400 A12 401 A12 402 aacecnast ganan OP Do the following 1 Set power switch to STANDBY 2 Disconnect the power cord 3 Measure the resistance of the Y TM tuning coil from XA12J2 14 to XA12J2 60 SYNTHESIZER MUTHERBORRD paraa BG XA12J2 M DE FRONT OF INSTRUMENT Go To A12 9000 errr tty
110. ave only been demonstrated as a part of a system a collection of instruments In general the failure cannot be repeated or characterized without a system present When troubleshooting system failures use the following suggestions in the order given 1 Ensure that you have the proper equipment for troubleshooting A spectrum analyzer and an oscilloscope are usually required 2 Run the diagnostic routines of all instruments in the system Eliminate any errors that are identified by the diagnostics before continuing 3 Determine the minimum system required to replicate the problem When eliminating portions of the system eliminate software first if possible 4 Check the system for excessive cable lengths poor grounds and improper installation overheating air blockage 5 Verify that all instruments contain compatible versions of firmware and software 6 If the failure is also intermittent check the environment and timing of the failures Note any relationship to time of day local maintenance schedules Special Cases 13 day of the month weekends season or local holidays Also check any severe line power problems or limitations these may be related to local production efforts SC 250 Block Diagram Notes This section describes the YO loop RF path and the two ALC loops and gives help interpreting the block diagram Also tables showing the interconnection of data addresses and busses are given The YO loop phase lock
111. blems gt 5s sweep time Do the YO or amp multiplier adjustments see the Service manual m Unable to properly control single sweep or manual sweep o Single sweep If you cannot control single sweep go to A15 9000 If you can control single sweep but the RF signal deteriorates badiy you may need to adjust the amp multiplier amp filter or YO Go to the Service manual o Manual Sweep go to A15 9000 If the rotary knob is not functioning replace only the RPG rotary pulse generator m Unable to use trigger sweep go to A15 9000 Trigger out delay does not work First replace the A15 assembly go to A15 9000 If the problem remains replace the A14 assembly go to A14 9000 m Save recall registers do not function properly o If you are unable to save or recall registers go to A15 9000 o If the save recall registers are lost when power is turned off then replace the battery on A15 A15BT1 If the battery has already been replaced go to A15 9000 If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem instrument Level Troubleshooting 71 A _ tt ILT 5000 To continue you will need either the front panel emulation software for the HP 8360 series synthesizers or a substitute front panel Refer to Automated Tests in the Service manual for the software and instructions Refer to Replaceable Parts in the
112. board observe the SWEEP indicator on the front panel When the center conductor is shorted to ground 34 Instrument Level Troubleshooting ILT 3401 the SWEEP OUTPUT should stop sweeping and the front panel SWEEP indicator should be off when the center conductor is not shorted to ground the output should sweep and the indicator should be on or blinking Does the STOP SWEEP IN OUT properly control the rear panel SWEEP OUTPUT and the front panel SWEEP indicator ag Go To ILT 3405 Continue Press SEC You should see a TTL high with a short TTL low every 2 to 3 seconds OSCILLOSCOPE REAR PANEL stor SWEEP IN OUT Go To A14 9000 Continue instrument Level Troubleshooting 55 ILT 3402 The rear panel STOP SWEEP IN OUT seems to be working properly If an undetected problem exists consider replacing the sweep generator assembly A14 9000 Otherwise use the instrument block diagram located at the end of Special Cases to troubleshoot this problem ILT 3405 Identify XA14J2 36 Alternately short to ground and open the XA14J2 36 Observe the SWEEP OUTPUT at the rear panel with a voltmeter if the instrument has a front panel with a display and keyboard observe the SWEEP indicator on the front panel When the pin is shorted to ground the SWEEP OUTPUT should stop sweeping and the front panel SWEEP indicator should be off when the pin is not shorted to ground the output should sweep and the indicator sho
113. bon cable connecting RF interface to YO 2 Check for an open circuit between XA13J2 14 and XA13J2 60 gt 100 kQ SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Continue Go To RF 2690 14 A13 YO Driver Troubleshooting A13 604 Do the following 1 Using the instructions in the Disassembly and Replacement Procedures chapter of the Service Manual remove the RF deck 2 Check for an open circuit between XA13J2 14 and XA 1332 60 gt 100 kQ SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Go To A22 9000 Go To A20 9000 A13 610 VOLTME TER SYNTHESIZER MOTHERBOARD o Go To A22 9000 Continue A13 YO Driver Troubleshooting 15 A13 611 Perform the following 1 Using the disassembly instructions in the manual remove the RF deck 2 Disconnect W42 from A26 YO 3 Measure the resistance of the YO coil at the YO The resistance should be gt 35 to lt 652 between A26J1 4 and A26J1 12 Go To RF 2690 Continue A13 612 A high resistance exists on either W42 ribbon cable that connects the RF deck to A26 or on A20 itself Replace W42 or A20 and then go to the troubleshooting foldout block 1 located just prior to the Special Cases tab 16 A13 YO Driver Troubleshooting A 13 9000 Replace the A13 assembly E Adjustments Required Troubleshooting Foldout Block 1 fi xLocated in front of the Special Cases tab Perform Adjustments
114. c line power using an isolation transformer Do not turn on the instrument Are any A18 indicators on aaa a y Go To A16 205 Continue Replace the 22 volt transformer and then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A16 A17 A18 Troubleshooting 21 A16 500 Select the first correct condition and go to the indicated paragraph Neon Green Amber Go To HIGH VLF 13 6V PREREGSHTDWN Paragraph A16 205 A16 560 A16 380 A dash indicates a don t care condition A16 560 Do the following 1 Set the line power switch to STANDBY 2 Disconnect the instrument from ac line power 3 Wait for all the indicators in the power supply section to go out 4 Install A16 5 Remove the front panel and disconnect the ribbon oon cables W2 and W3 that connect the front panel to the motherboard 6 Connect the instrument to ac line power using an isolation transformer and set the line power switch to ON Is the 13 6V LED green DS1 on Go To A16 320 Continue 22 A16 A17 A18 Troubleshooting A16 561 A16 562 Do the following ot gt Set the line power switch to STANDBY Disconnect the instrument from ac line power Wait for all the indicators in the power supply section to go out Reconnect W2 Connect the instrument to ac line power using an isolation transformer and set the line power switch to ON Is the 13 6V LED green
115. cceptable repair ay Go To A22 9000 Continue A7 1323 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A7 Reference Troubleshooting 19 A7 1335 A7 1336 A7 1340 There is an open on the motherboard between XA7J2 22 and XA15J2 24 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Check for a TTL signal with a period of 1 5 to 3 0 seconds VOLTNETER SYNTHESIZER NOTHERBUARD E AS a MYTTTTL ET esaennn fl saanusesooanas Y LREFUNLK Continue Go To A15 9000 22 A7 Reference Troubleshooting A7 1341 There is an open on the motherboard between XA7J1 25 and XA15J1 36 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue A7 1342 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A7 1345 e seacene ees h WE aaamooo O85 sosscrsrrnocaoa il Go To A7 1347 Go To A15 9000 A7 Reference Troubleshooting 23 A7 1346 Continue Go To A15 9000 A7 1347 There is an open on the motherboard between XA7J1 24 and XA15J1 37 Verify this with an ohmmeter Is jumpering an acceptable repair ay Go To A22 9000 Continue A7 1348 Install a jumper and go to t
116. connects the motherboard to A2 6 Temporarily replace the front panel leaving W2 loose 7 Reconnect line power the power on control is on A2 so the synthesizer will power up automatically even in standby ota SERVICE hl Praia EAS 5 r Se E Te Se Y TNA rier Continue Go To A2 9000 A15 CPU Troubleshooting 3 A15 103 Warning y A15 104 4 A15 CPU Troubleshooting Perform the following setup 1 Disconnect the line power cord 2 Wait for all the indicators in the power supply section to go out 3 Remove the front panel 4 Reconnect W2 to A2 5 Disconnect W3 the ribbon cable that connects A3 to the motherboard 6 Temporarily replace the front panel leaving the ribbon cable loose 7 Reconnect the line power cord 8 Set the line power switch to ON 9 Observe the red indicators on A15 Are all A15 indicators off 3 gt g Continue Go To A3 9000 When the instrument is connected to ac line power or the A18 high voltage neon indicator is on there are voltages present that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service on this instrument with its protective covers removed Perform the following setup 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Remove the front panel and reconnect W3 the r
117. ct the instrument to ac line power using an isolation transformer and set the line power switch to ON DD a A16 A17 A18 Troubleshooting 19 Is the A18 5VHD OVER CURRENT indicator on Continue Go To A16 395 A16 392 Do the following 1 2 3 4 5 Connect the instrument to ac line power through an Set the line power switch to STANDBY Disconnect the instrument from ac line power Wait for all the indicators in the power supply section to go out Reconnect W2 isolation transformer and set the line power switch to ON Is the A18 5VHD OVER CURRENT indicator on aq Go To A3 9000 Go To A2 9000 A16 395 Do the following i Ze 3 Ot a Set the line power switch to STANDBY Disconnect the instrument from ac line power Wait for all the indicators in the power supply section to go out Install A15 Remove A14 Connect the instrument to ac line power using an isolation transformer and set the line power switch to ON 20 A16 417 A18 Troubleshooting A16 400 A16 401 Is the A18 5VHD OVER CURRENT indicator on aq Go To A14 9000 Go To A16 385 Do the following 1 Replace the line fuse 2 Remove the rear panel 3 Disconnect A22J10 wiring harness from the motherboard This wiring harness connects the 22V toroidal transformer to the motherboard 4 Ensure that the 22V wiring harness is out of the way and then replace the rear panel 5 Connect the instrument to a
118. ction Correct the faulty connection or replace the faulty part W54 FL2 W51 To check for excessive loss in a cable filter or isolator apply a known good signal for the frequency bands in question to the component see the block diagram at the end of Special Cases and test the output Over the frequency range of 2 0 to 8 0 GHz the loss for a coaxial cable should be lt 2 0 dB the loss for a filter or an isolator should be lt 4 0 dB Replace the defective part and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab HP 8360 Troubleshooting A10 Troubleshooting Section RF Troubleshooting HP 8360 Troubleshooting Section A10 702 Change the last paragraph to read as follows If you do not find any problems replace A10 go to A10 9000 if it has not already been replaced Otherwise replace the mod splitter A25 go to Rf 2590 RF 000 Add the following message RF MOD SPLIT Prelevel Det RF 200 RF 200 New add after RF 100 Check the ribbon cable that connects the mod splitter A25 to the RF interface board A20 If it is loose reseat the cable Correct any other obvious faults Perform the following test 1 Press PRESET PRESET SERVICE 2 Select Selft 3 Press 4 Select Ka Go 4 RF 202 RF 201 New add after RF 202 Set up for power measurement 1 Set the line power switch to STANDBY 2 Lift up the RF D
119. cuits to the RF deck Measure the resistance of the 5 VAUp to ground XA16J1 76 to ground VOL THE TER SYNTHESIZER NOTHERBOARD Go To 420 9000 Continue A16 A17 A18 Troubleshooting 81 A16 4906 Reconnect the microcircuit ribbon cables one at a time while measuring the resistance of the 5 VAUp to ground XA16J1 76 to ground Did a microcircuit cause a resistance measurement of lt 1 kQ aq Go To A16 4908 Continue A16 4907 Go to the paragraph indicated to replace the faulty microcircuit Microcircuit Go To Paragraph A29 amp filter RF 2990 A28 amp multiplier RF 2890 A26 YO A24 low band A31 attenuator A32 amp doubler A33 amp switch A16 4908 Reinstall A6 Measure the resistance of the 5 VAUp to ground XA16J1 76 to ground If A6 causes a resistance measurement of lt 1 kQ go to A6 9000 If not you may have removed the defect in the disassembly process or the problem may be intermittent Go to Troubleshooting Foldout block 1 82 A16 A17 A18 Troubleshooting A16 4910 Reinstall the previously removed assemblies one at a time while measuring the resistance of the 5 VAUp to ground XA16J1 76 to ground Replace the assembly that causes a resistance measurement of lt 1k If no assembly causes a low resistance measurement you may have removed the defect in the disassembly process or the problem may be intermittent Go to Troubleshooting Foldout block 1 A16 4930 Refer to the disassemb
120. dout block 1 located just prior to the Special Cases tab XA15J1 8 XA15J1 48 XA15J1 9 XA15J1 49 XA15J1 10 A2 Source Module Interface Troubleshooting 9 A2 1316 A2 1317 If one or more signals do not have TTL pulses the test has failed If all signals have TTL pulses the test has passed q Go To A15 9000 uv Continue There is an open on the motherboard data bus between A22J1 and XA15J1 Verify this with an ohmmeter Is jumpering an acceptable repair ag Go To A22 9000 Continue Select the failing signals and install jumpers as required Signal A2 Location A15 Location AB2 A2231 28 XA15J1 8 AB3 A2231 27 XA15J1 48 AB4 A2231 26 XA15J1 9 AB5 A2231 25 XA15J1 49 A2231 23 XA15J1 10 When the repair is complete go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 10 A2 Source Module interface Troubleshooting A2 1320 A2 1321 A2 1322 rE TTE E EII S sesuaa Y BO nauseas T ES E aa lt I Go To A16 9000 Continue There is an open on the motherboard between A22J1 1 and XA16J1 30 31 70 or 71 Verify this with an ohmmeter Is jumpering an acceptable repair aq L S Go To A22 9000 Continue Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A2 Source Module Interface Troubleshooting 11 A2 1325 T atakanto r
121. e A5 401 Set up the following measurement and look for a very slow moving TTL signal YOIFCNTR Go To A5 8500 Continue A5 YO Loop Troubleshooting 7 A5 402 Set up the following measurement and look for a very slow moving TTL signal Continue Go To A14 9000 A5 403 There is an open on the motherboard between XA5J1 25 and XA14J1 36 Verify this with an ohmmeter Is jumpering the open an acceptable repair Go To A22 9000 Continue A5 404 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 8 A5 YO Loop Troubleshooting A5 410 A5 411 A5 412 A5 500 Go To A14 9000 Continue There is an open on the motherboard between XA5J1 24 and XA14J1 75 Verify this with an ohmmeter Is jumpering the open an acceptable repair Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Perform the one key sequence 3 To nter a Fe Brees fo IO ENTER Where XXX is the frequency of the fractional N loop The frequency of the fractional N loop is valid from 30 MHz to 60 MHz A5 YO Loop Troubleshooting 9 A5 602 There is an open on the motherboard between XA5J1 49 and XA15J1 75 Verify this with an ohmmeter Is jumpering the open an acceptable repair a Go To A22 9000 Continue A5 603 Install a jumper Then go to Troubleshooting Foldout block 1 loca
122. e registers lack a logging feature but they can be used to exercise the instrument in a customized fashion without the use of an external controller or computer How to Loop and Log a Diagnostic Test You may loop on the full self tests test 0 a group of tests for example test 47 tests the A5 assembly or on a single test The following example loops on a single diagnostic test P gt PES i rf OTY 5 Select Do The instrument will continuously repeat test 51 Each time the test is completed the Number of PASSES or Number of FAILS is updated on the display The selftest menu will be updated with the results of the last test This can be useful in determining how often a failure occurs Continue with the following rosene Notice that the test is run once and the pass fail status in the selftest menu is updated Continue with the following to log the results of test 51 to the display OG _ asterisk on 9 Press PRIOR 10 Select Eog asterisk on 6 Special Cases causes the results of each measurement or 13 Select asterisk ea E Ks 14 Press PRIOR 15 Select Loop 16 Select D 17 18 19 Remove the instrument top cover and carefully remove ele coax cable from A5J1 the left most coax cable connected to A5 Notice that the instrument immediately ne to log the failures to the display Cont you may have to press Cont than once Whe
123. e 1 1 lists recommended troubleshooting equipment You may use any equipment that meets the critical specifications listed instruments Without a Front Panel Keyboard If your instrument does not have a keyboard there are two ways you can troubleshoot it 1 Use the front panel emulation software as instructed in instrument level troubleshooting The software itself is documented in the Automated Tests chapter of the Service manual 2 Use a substitute front panel to order see Replaceable Parts in the Service manual Lifting the RF Deck In some of the troubleshooting procedures you will be Up Into the Service required to lift the RF deck up into the service position Position Instructions for this procedure are documented in the Disassembly amp Replacement Procedures chapter in the Service manual as part of the RF Deck Disassembly amp Reassembly procedure HP 8360 Troubleshooting Introduction 1 3 Table 1 1 Recommended Troubleshooting Equipment Recommended HP Model or PN a 3456A Instrument Critical Specifications Range 50 to 50 Vde Accuracy 0 01 Input Impedance gt 10 MQ Digital Voltmeter 1 Frequency Counter Range 0 01 to 26 5 GHz Accuracy Time base 1 count Aging Range 5 x 10719 Sine Wave Amp gt 1 V rms Sine Wave Freq de to 100 kHz Function Generator 33254 Dual Channel Bandwidth de to 300 MHz
124. e graph and go to the paragraph shown for that frequency Note if your failure is between 100 Hz and 1 kHz check frequencies above and below the failure If the frequencies below 100 Hz are failing or are close to failing go to A7 9000 If the frequencies above 1 kHz are failing or are close to failing go to A6 9000 In the synthesizer phase noise is usually concentrated at one of three carrier offsets Failures of phase noise at these offsets have fairly predictable causes Before you change a module check the phase noise measurement system Instrument Level Troubleshooting 25 Note If the fault is only in low band the low band microcircuit A24 is also a possible cause RF 2490 E GO TO A7 9000 GO TO A6 9000 I 60 TO RF 2690 GO TO A13 9000 100Hz iKHz 10KHz 100KHz OFFSET FROM CARRIER These problems are very difficult to isolate and require patience Often the quickest and most economical way to isolate a problem is to substitute modules After taking action go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab ILT 2650 Perform a full user calibration I Press USER CAL 2 Select E If the problem still exists continue In general troubleshoot harmonics using the block diagram Go from the RF OUTPUT J1 to each of the active RF devices A24 A26 A28 A29 A38 and with options A32 and A33 Use the ALC menus to help control the 26 Ins
125. e is 10 MHz or harmonic of 10 MHz getting into the sampler assembly Check shielding grounds filtering on the A6 assembly and cable routing m Fixed offset spurs These are the most common spurs They appear at a fixed offset from the carrier The following table lists the most common offset spurs the their possible causes Note If the fault is only in low band the low band microcircuit A24 is also a possible cause Offset from Carrier Grounds connections and shielding A16 A17 A18 a kHz NN A3 A6 shielding filtering jii kHz y vi API adjustment shielding filtering possibly reference shielding filtering Random Low Frequency Fan B1 Most Likely Fault A16 A17 A18 Routing of cables to and from AT 24 Instrument Level Troubleshooting IL T 2640 These problems are very difficult to isolate and require patience Often the quickest and most economical way to isolate a problem is to substitute modules After taking action go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Poor grounds or shielding problems in either the environment or the measurement system can produce what looks like a failure in phase noise measurements Another common source of phase noise is physical vibration When you are sure that the measurements accurately reflect a failure refer to the following graph Locate the failed frequency on th
126. eck in the service position Remove the ribbon cables that connect the microcircuits to the RF deck Measure the resistance of the 5 Vdc supply to ground XA16J1 18 19 58 and 59 to ground SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Go To A20 9000 Continue A16 4506 Reconnect the microcircuit ribbon cables one at a time while measuring the resistance of the 5 Vdc supply to ground XA16J1 18 19 58 and 59 to ground Also check the 5V fuse on A16 and replace it if open Does a microcircuit cause a resistance measurement of lt 750 Go To A16 4508 Continue 54 A16 A17 A18 Troubleshooting A16 4507 Go to the paragraph indicated to replace the faulty microcircuit Microcircuit Go To Paragraph A29 amp filter A28 amp nuultiplier A26 YO A24 low band A31 attenuator A32 amp doubler A33 amp switch A16 4508 You may have removed the defect in the disassembly process or the problem may be intermittent Also check the 5V fuse on A16 and replace it if open Go to Troubleshooting Foldout block 1 located just prior to the Special Cases tab A16 4510 Reinstall the previously removed assemblies one at a time while checking the resistance of the 5 Vdc supply to ground XA16J1 18 19 58 59 to ground Replace the assembly that causes a resistance measurement of lt 7501 H no assembly causes a low resistance measurement you may have removed the defect in the disassembly process or the proble
127. eck into the service position refer to the disassembly and replacement procedures 3 Remove W52 the cable that connects the YIG oscillator A26 to the mod splitter A25 4 Set the line power switch to ON 5 Press GERVICE Change 8 2 7 2 8 Change B QO Press 9 Using the rotary knob sweep the frequency from 2 to 7 GHz 10 Verify that power is gt 8 dbm across the 2 to 7 GHz frequency range Set up for frequency measurement 1 Press 2 GHz 2 Increment the frequency using 3 The measured frequency equals the front panel indication 40 MHz from 2 to 7 GHz YO Disconnect W52 From A26 iy Go To RF 2690 Go To RF 2590 RF 202 New add after RF 201 The problem appears to be fixed Go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab RF 801 1 In step 2 change A41 to A25 HP 8366 Troubleshooting HP 8360 Troubleshooting 2 In step 7 change 45 Mhz to 10 Mhz 3 Use the RPG knob to vary the CW frequency over a range of 10 Mhz to 1 99 GHz 4 The power should be gt 7 dBm and the frequency should be 5 41 to 7 39 GHz 5 Change the measurement setup illustration to show these differences 6 If the measurement fails go to RF 2590 RF 802 1 In step 1 change A41 to A25 2 In step 3 change 2 GHz to 1 9 GHz RF 2590 New add after RF 2491 The mod splitter A25 is the most likely failure However there is
128. ect control over the power level with the ALC loop open Continue with the following sequence 1 Press POWER LEVEL 2 Use the rotary knob to set the ALC for maximum measured power 3 Using the rotary knob the measured RF power should be adjustable from lt 28 to gt 0 dBm 4 Press cw 5 Press A increments frequency OD MOT da Repeat steps 1 through 5 until the CW frequency equals 7 26 5 GHz HP 836314 514 or 20 GHz HP 836214 If there is an unleveled condition at a specific frequency set that CW frequency and repeat steps 1 through 3 Disconnect W61 From A28 POHER METER Range From lt 28dBm to gt 0dBm FREQUENCY COUNTER 2 0 to 26 56Hz HP 83631A 51A PG Ge 0214 TL dl 83621A Go To SYS 620 Go To RF 2990 HP 8360 Troubieshooting HP 8360 Troubleshooting SYS 605 New add after SYS 601 Use a power meter to measure the power out the front or rear panel RF output connector Does power meet specifications in all bands a Continue Go To RF 3090 SYS 606 New add after SYS 605 Perform the following setup 1 Set the power switch to standby 2 Reconnect any disconnected cables 3 Remove the hard line which connects to the input of the bridge detector for HP 83621A 31A or coupler detector for HP 836514 A30 Turn power on Press PRESET CW ate Select I Press cw Press 2 GHz The following sequence exercises direct c
129. ections between the HP 8510 and the other instruments are correct a RF output m Stop sweep in out m Sweep output m Trigger output HP IB m Front or rear panel source module interface w Auxillary Interface If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem 90 Instrument Level Troubleshooting A1 Front Panel Keyboard Troubleshooting AR TT EZ 0 TT SS TDT ID EEE A1 000 When the full self tests are run from the service menu the keyboard test is not run Only the keyboard to A3 interface is tested To test the keyboard run the following test Perform the p se key sequence On the display you will see a dash corresponding to each front panel softkey and hardkey except for PRESET Pressing a key causes the corresponding dash to toggle to an X Each successive key press toggles the C to the dash and back In addition the rotary knob RPG toggles the two dashes in the upper right hand corner of the display The one that toggles depends on the direction the RPG is turned To exit the test press If this test fails the key press does not cause a toggle to occur you may still have a good keyboard The front panel processor provides the interface between the keyboard and the rest of the instrument A bad interface could cause this test to fail Go to A3 000 to check the A3 to Al interface
130. eep line that connects to the rear panel BNC of the same name Did the sweep stop and start as described a 3 Go To ILT 3202 Continue instrument Level Troubleshooting 63 64 ILT 3703 ILT 3704 Locate pin 15 on the auxiliary interface Alternately short to ground and open pin 15 Observe pin 18 with a voltmeter if the instrument has a front panel with a display and keyboard observe the SWEEP indicator on the front panel When the pin is shorted to ground the output at pin 18 should stop sweeping and the front panel SWEEP indicator should be off when the pin is not shorted to ground the output at pin 18 should sweep and the indicator should be on or blinking This is the LQSS signal used to synchronize the A4 assemblies in systems that have more than one HP 8360 series synthesized sweeper Did the sweep stop and start as described Go To ILT 3405 Continue Most but not all auxiliary inputs and outputs have been checked The remaining faults will appear to be synchronization problems related to having multiple HP 8360 series sweepers in a system or problems with markers re you sure the instrument has an auxiliary interface problem aq Done Go To A19 9000 Instrument Level Troubleshooting ILT 3710 Press and check for TTL activity REAR PANEL Z AXIS BLANK MKRS Go To ILT 3501 Go To A19 9000 ILT 3720 Press and check for TTL activity REAR PANEL stor SWEEP IN OUT Go To ILT 3
131. eep output are the sweep generator assembly A14 and the CPU assembly A15 instrument Level Troubleshooting 45 ILT 3140 ILT 3141 ILT 3142 ILT 3150 Measure the resistance between A22J8 41 and XA15J1 61 Is the resistance gt 207 aq Go To 1 T 3160 Continue There is an open on the motherboard between A22J8 41 and XA15J1 61 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Measure the resistance between SWEEP OUTPUT and XA14J2 4 Is the resistance 90 to 1100 a q Continue Go To A14 9000 46 Instrument Level Troubleshooting ILT 3151 ILT 3152 ILT 3153 ILT 3160 Measure the resistance between A22J8 31 and XA14J2 4 Is the resistance gt 212 ag Go To ILT 3160 Continue There is an open on the motherboard between A22J8 31 and XA14J2 4 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A fault exists in either the rear panel SMI A19 or the ribbon cable W31 Inspect W31 Replace the rear panel SMI A19 or W31 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab instrument Level Troubleshooting 47 ILT 3170 Perform t
132. er and disconnect W54 from A6 Inspect and test W54 for defects Is W54 defective Go To A6 9000 Continue Replace W54 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab ILT 2020 There is a high loss path between the directional coupler A39 and the sampler A6 This path includes two hard lines W54 and W51 a low pass filter FL2 and a 20 dB attenuator AT3 The most likely failure is a poor connection Correct the faulty connection or replace the faulty part W54 FL2 W51 A less likely option is that the 20 dB attenuator AT3 is faulty Isolate and replace the faulty component and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab To check for excessive loss in a cable filter or attenuator connect the component input to a 16 Instrument Level Troubleshooting ILT 2030 ILT 2110 ILT 2111 ILT 2112 known good signal for the frequency bands in question see the block diagram at the end of Special Cases and test the output Over the frequency range of 2 0 to 8 0 GHz the loss for a coaxial cable should be lt 2 0 dB the loss for a filter should be lt 4 0 dB and the loss of the 20 dB attenuator should be 20 dB The most likely cause of this failure is A26 the YIG oscillator go to RF 2690 If replacing A26 does not resolve the problem it is possible but less likely that A13 the YO driver assembly could be
133. er switch to ON 4 Press SERVICE 6 7 Continue Go To A15 235 A15 CPU Troubleshooting 9 A15 231 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A11 and A12 assemblies Go to A15 8500 A15 235 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A11 assembly 3 Set the line power switch to ON 4 Press SERVICE 5 Select 6 7 Go To A11 9060 Go To A12 9000 A15 240 Perform the following Set the line power switch to STANDBY Remove the A9 and A10 assemblies Set the line power switch to ON In ta og Dom Continue Go To A15 245 10 A15 CPU Troubleshooting A15 241 A15 245 A15 250 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A9 and A10 assemblies Go to A15 8500 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A9 assembly 3 Set the line power switch to ON 4 Press SERVICE 5 Select Se fenu Go To A9 9000 Go To A10 9000 Perform the following 1 Set the line power switch to STANDBY 2 Remove the A7 assembly 3 Carefully remove the A6 assembly Be sure to disconnect all cables Set the line power switch to ON Press Select ae ee ee kn kor 6 pep Rare Press 32 ENTER i AS POTO M A15 CPU Troubleshooting 11 A15 251 A15 255 A15 260 12 A15 CPU Troubleshooting y Continue Go To
134. er switch to standby Remove the top and bottom covers Turn the synthesizer power on OR ON asterisk on Select LoopCnt Press 2 GHz 8 Using the rotary knob sweep the frequency from 2 0 to 7 4 GHz and verify that power is greater than 25 dBm O J Set up for frequency measurement 1 Press 2 GHz 2 Using increment the frequency 3 The measured frequency equals the front panel indication 40 MHz 2 0 to 7 4 GHz O Disconnect W54 From F112 M Manually sweep 2 0 to 7 4GHz yh Continue Go To A6 410 A6 Sampler Troubleshooting 9 A6 401 Set up for power measurement 6 Select Press 2 GHz Using the rotary knob sweep the frequency from 2 to y Press PRESET Select T Reconnect any disconnected cables Put the RF deck in the service position Remove the 20 dB attenuator AT3 from the directional coupler A39 Gu GERVICE asterisk on 7 4 GHz and verify that power is gt 7 dBm Set up for frequency measurement 1 2 3 Press 2 GHz Using A increment the frequency The measured frequency equals the front panel Indication 40 MHz 2 to 7 4 GHz POKER METER Disconnect AT3 From A39 2 7dBrn w51 Ae 20d8 FREQUENCY COUNTER M Manually sweep 2 0 to 7 4GHz UOMHz 14 Continue Go To A6 420 Directional Coupler 10 A6 Sampler Troubleshooting A6 402 Set up for
135. eshooting Continue Go To A15 320 Perform the following 1 Set the line power switch to STANDBY 2 Replace all of the assemblies removed in the previous step 3 Carefully remove the A6 assembly Be sure to disconnect all flexible and semi rigid coax cables before removing A6 Set the line power switch to ON 4 5 Press PRESET SERVICE 6 T En amp Press ENTER ay Continue Go To A6 9000 A15 302 Perform the following setup 1 Ze 3 4 Set the line power switch to STANDBY Disconnect the line power cord Wait for all the indicators in the power supply section to go out Replace the A6 assembly removed in the previous step Remove the front panel and disconnect W2 the ribbon cable that connects the motherboard to A2 Refer to the disassembly procedures as needed Temporarily replace the front panel leaving W2 loose Reconnect line power the power on control is on A2 so the synthesizer will power up automatically even in standby pg Continue Go To A2 9000 A15 CPU Troubleshooting 17 A15 303 Warning A15 304 18 A15 CPU Troubleshooting Perform the following setup l Disconnect the line power cord 2 Wait for all the indicators in the power supply section to go out Remove the front panel Reconnect W2 to A2 Disconnect W3 the ribbon cable that connects A3 to the motherboard Temporarily replace the front panel leaving W3 loose Reco
136. eshooting Foldout block 1 located just prior to the Special Cases tab A4 Fractional N Troubleshooting 13 A4 1310 Go To A15 9000 Continue A4 1311 There is an open on the motherboard between XA4J 1 26 and XA15J1 2 Verify this with an ohmmeter Is jumpering an acceptable repair a 4 Go To A22 9000 Continue A4 1312 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 14 A4 Fractional N Troubleshooting A4 1315 Go To A15 9000 Continue A4 1316 There is an open on the motherboard between XA4J1 4 and XA15J1 7 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue A4 1317 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A4 Fractional N Troubleshooting 15 A4 1320 Go To A15 9000 Continue A4 1321 There is an open on the motherboard between XA4J1 29 and XA15J1 52 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue A4 1322 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 16 A4 Fractional N Troubleshooting A4 1325 SYNTHESIZER NOTHERECHRG Go To A15 9000 Continue A4 1326 There is an open on the motherboard between XA4J1 31 and XA15J1 49 Verify this with an ohmmeter Is jumpering an acceptable repair I Go To A
137. ether the keyboard can communicate with the front panel processor Perform the following key sequence 1 Turn the line power switch to ON 2 Press and any other key together 3 Release and then release the other key 4 Look at the top edge of the front panel processor just to the left of the rotary knob RPG A series of six indicators should be visible To observe the data interchange between the keyboard and the front panel processor press a key and you should see the key code change The indicators should change each time you press a different key A3 Front Panel Processor Troubleshooting 1 The following selected key sequences do a good job of checking the interface between A3 and A1 If these or others are faulty the problem will be A3 A1 or the connecting ribbon cable W5 Indicators 101 101 010 010 100 000 010 000 110 000 001 000 101 000 000 001 000 O10 000 100 111 110 SYSTEM 011 011 1 1 ON 0 0FF 2 A3 Front Panel Processor Troubleshooting A3 9000 Replace the A3 assembly Adjustments Required Troubleshooting Foldout Block 1 I xLocated in front of the Special Cases tab Perform Adjustrnents Adjustments Successtul A3 Front Panel Processor Troubleshooting 3 eee eee out ttt tenned dann EA A A Eee rete en III III Fee Nee roer eee eee eat mmm rors EEES RARA mp nil
138. ference to the instrument chassis High line and low line resistance to ground should be gt I MQ The ground connection resistance to instrument chassis should be lt 0 10 VOL THETES er ee paee a TT EE a a y gt 1M0 i lt 0 40 deh Go To A16 207 Continue A16 202 Measure the resistance between high line and low line REAR PANEL AC POHER CONNECTION Go To A16 208 Continue A16 A17 A18 Troubleshooting 7 Ai6 203 Reconnect the rear panel 8 pin line switch connector to the motherboard A22J9 Measure the resistance between high line and low line VOLTNETER oran er atono VF gt 1MQ Continue Go To 416 207 A16 204 Warning Direct connections to line voltages will be exposed during this and subsequent steps Ensure that line power is compietely removed 8 A16 A17 A18 Troubleshooting A16 205 Ensure that all power is disconnected and all capacitors are discharged Remove the small red cover high voltage cover at the bottom rear of the instrument The cover is held in place with three screws Two screws are located on either side of XA18J1 A18 motherboard connector and are accessed from the top of the motherboard The third screw is located at the rear edge of the motherboard You may have to remove the rear panel to access this third screw Inspect the line power traces on the motherboard Look for signs of shorting discoloration or other signs of damage Are any of
139. fficult pulse to see Do not use a frequency counter to check frequency because of the tendency to count the second harmonic 500mV Div Disconnect Witt from AU Go To A4 320 Continue A4 301 Perform the following setup Turn the synthesizer off Remove the A4 assembly Turn the O EE on Com ON t Does FRACN rudiente OK Go To A4 1335 Continue A4 Fractional N Troubleshooting 7 A4 302 Perform the following setup 1 Carefully short XA4J1 50 to ground A4 should still be removed A Same A Ear menua Sees ae ite tet eT nto twice Gi Fr data gt JE E ED Beaver oase arrest my A Brende bars ame Late dratt fysste Does FRACN indicate UNLOCK a Go To A4 1335 Continue A4 303 Perform the following setup 1 Turn the synthesizer off 2 Re install the A4 assembly and reconnect the cables 3 Turn the synthesizer on Loop self test Li 8 A4 Fractional N Troubleshooting OSCILLOSCOPE SYNTHESIZER NOTHEREOARA Ox Go To A4 9000 Continue A4 304 Perform the following setup middle third of the Is the een needle i in the perserne display Go To A4 9000 Continue he A4 VCO tune adjustment refer A4 305 Try to execute I the Service manual and then to Adjustments in continue A4 Fractional N Troubleshooting 9 10 Ad Fractionai A4 306 A4 307 Was the adjustment successful ay Go To A4 9000 Continue Do self test 29 1
140. following Set the line power switch to standby Disconnect W14 from A5J3 Set the line power switch to ON Press msec Ignore the UNLOCK message 6 Set the oscilloscope as follows s Trigger on negative edge Sweep time 15 msec 7 Compare the waveform on the oscilloscope to the one shown Ignore the amplitude of the pulses Look for A5 sweeping to lock 8 Reconnect W14 to A5J3 Aa O Oo OSCILLOSCOPE Disconnect Wi From A5J3 Go To A5 9000 Continue System Troubleshooting 3 SYS 102 SYS 104 4 System Troubleshooting AS SWEEPING O MERT Perform the following setup 1 Set the line power switch to standby 2 Disconnect W14 from the YO A2632 Ensure that the cable does not short out anything else 3 Set the line power switch to ON 1 Press REED GED GH GOD O Ga 5 Press msec Ignore the UNLOCK message 6 Set the oscilloscope as follows n Trigger on negative edge m Sweep time 10 msec 7 Compare the waveform on the oscilloscope to the one shown Ignore the amplitude of the pulses Look for A5 sweeping to lock 8 Reconnect W14 to A2632 TO LOCK 1OmSec Go To SYS 120 Perform the a setup 2 Select Sr 3 Press 252 ENTER 4 Select Log asterisk on Disconnect W14 From A26J2 A26J2 Continue 5 Select on 6 Press PRIOR 7 Select E 8 Note the data points that fail and select the test is complete
141. following 1 Remove A12 2 Measure the resistance of the YTF tuning coil from XA12J2 44 to XA12J2 30 A12 Multiplier Filter Driver Troubleshooting 15 LL LE EE GJ H a 31 30 FRONT OF INSTRUMENT Continue Go To A12 9000 in A12 603 Do the following m Disconnect W41 from A29J1 ribbon cable connecting RF interface to amp filter m Check for an open circuit between XA12J2 44 and XA12J2 30 gt 100 kQ SYNTHESIZER NOTHERAGARD a AROARDA gt og ee FRONT OF INSTRUMENT Continue Go To RF 2990 16 A12 Multiplier Filter Driver Troubleshooting A12 604 Do the following z Using the disassembly instructions in the manual remove the RF Deck m Check for an open circuit between XA12J2 44 and XA12J2 30 gt 100 kQ SYNTHESIZER MOTHERBOARD Sarna ut es 2erVAIODO AAA PR FRONT OF INSTRUNENT Go To A22 9000 Go To A20 9000 A12 610 VOL TMETER SYNTHESIZER MOTHERBOARD Go To A22 9000 Continue A12 Multiplier Filter Driver Troubleshooting 17 A12 611 Do the following Using the disassembly instructions in the manual remove the RF deck m Disconnect W41 from A29 amp filter Measure the resistance of the YTF coil at the amp filter The resistance should be gt 35 to lt 650 between A29J7 4 and A2937 12 gg Go To RF 2990 Continue A12 612 A high resistance exists on either W41 the ribbon cable that connects the RF interface to A29 or on A20 itself
142. fon Ooi t ntaosaaseeana 000 FRONT OF INSTRUMENT Go To A16 9000 Continue A2 1326 There is an open on the motherboard between A22J1 29 and XA16J1 18 19 58 or 59 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue A2 1327 Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 12 A2 Source Module interface Troubleshooting A2 8000 A2 8500 Perform the following tasks 1 Remove front panel 2 Completely remove W2 W2 connects A2 to the motherboard 3 Using an ohmmeter check W2 Is W2 Faulty Go To A2 9000 Continue Replace W2 You may want to consider replacing the A2 assembly Then go to Troubleshooting Foldout block 1 located just prior to the Special Cases tab A2 Source Module interface Troubleshooting 13 A2 9000 Replace the A2 assembly Adjustments a Required Troubleshooting Foldout Block 1 Perform Adjustments Located in front of the Special Cases tab Adjustments successful 14 A2 Source Module interface Troubleshooting A3 Front Panel Processor Troubleshooting A3 000 The front panel processor A3 serves as an interface between the rest of the instrument and the display A21 and keyboard A1 Go to A21 000 for display testing Keyboard testing is given in A1 000 however the following is an additional test that checks wh
143. from A22J3 and disconnect W33 from A22J4 These cables are located between the RF mr and the SDE cage Do Test 108 Did in 108 pass pa Go To A9 9000 Continue A9 303 A9 304 A9 305 A9 306 Do the following l Reconnect W32_ to aa Did self test 4108 dl Ca Continue Go To A9 306 Do the following 1 Lea W32 aoe A2533 EEE Did self test 108 pass nd Go 4 RF 2590 Replace W32 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Do the following 1 Reconnect W33 to A22J4 2 Disconnect W33 Ton A2436 3 Select De E Did self test t 108 il Ca Continue Go To RF 2490 A9 Pulse Troubleshooting 9 A9 307 Replace W33 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A9 310 LOPENLOOP Go To A10 9000 Continue A9 311 There is an open on the motherboard between XA9J1 50 and XA10J1 50 Verify this with an ohmmeter Is jumpering the open an acceptable repair Go To A22 9000 Continue A9 312 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 10 A9 Pulse Troubleshooting A9 320 Go To A10 9000 Continue A9 321 There is an open on the motherboard between XA9J1 49 and XA10J1 49 Verify this with an ohmmeter Is jumpering the open an acceptable repair 3 gt 3 Go To A22 9600 Continue A9 322 Install
144. g setup 1 2 3 af amp ot Set the line power switch to STANDBY Disconnect the line power cord Wait for all the indicators in the power supply section to go out Reconnect W3 the ribbon cable that connects the motherboard to A3 Temporarily replace the front panel Reconnect the line power cord Repeat the power on sequence and observe the indicators on A15 A15 CPU Troubleshocting 39 Did all the indicators turn on temporarily and then turn off 2 gt g Go To A3 9000 Go To A2 9000 A15 1400 Perform the following setup 1 5et the line power switch to STANDBY 2 Completely remove the following assemblies e A4 fractional n m A5 YO loop m A7 reference m AQ pulse m A10 ALC m Ail FM driver m A12 SYTM driver m A13 YO driver m Al4 sweep generator 3 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off Continue Go To A15 1420 A15 1401 Perform the following setup i Set the line power switch to STANDBY 2 Replace all of the assemblies removed in the previous step and reconnect all cables 40 A15 CPU Troubleshooting A15 1402 Carefully remove the A6 assembly Be sure to disconnect all flexible and semi rigid coax cables before removing A6 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off I Continue Go To
145. hard lines making sure that none of the cables are cross threaded canted or damaged Check all connections from the YO A26 to the RF OUTPUT connector J1 Are all connections and cables good Go To ILT 2260 Continue 18 Instrument Level Troubleshooting ILT 2241 ILT 2242 ILT 2245 ILT 2246 Does the instrument have low band lt 2 GHz and does the RF power problem exist only in low band a q Go To ILT 2245 Continue The problem is most likely the low band microcircuit A24 A less likely possibility is the amplifier multiplier A28 in the HP 83621A 31A or the doubler A32 in the HP 83651A Before continuing check again for loose or poorly seated connectors Has A24 been previously replaced a 3 Go To RF 2490 Go To ILT 2257 Does the RF power problem exist only at frequencies gt 2 GHz Go To ILT 2256 Continue Is the synthesizer upper frequency limit 50 GHz a 4 Go To ILT 2255 Continue Instrument Level Troubleshooting 19 ILT 2247 Does the RF power problem exist only when the A32 doubler is active gt 26 5 GHz for instruments with an upper frequency limit of 50 GHz a q Go To ILT 2255 Continue ILT 2248 Loose connections or bad RF cabling can easily cause problems at these frequencies Check all cabling from the amplifier multiplier A28 to the RF OUTPUT J1 If all RF cabling appears intact the most probable cause is the amp doubler A32 Are the cabling and J1 i
146. he Troubleshooting Foldout block 1 located just prior to the Special Cases tab 24 A7 Reference Troubleshooting A7 9000 Replace the A7 assembly Adjustments Required Troubleshooting Foldout Block 1 fi Located in front of the Special Cases tab Perform Adjustments Adjustments Successful A7 Reference Troubleshooting 25 AAN pre ver NE PP AAN ENE ERNE EEN meae Am rm mm O ASAS A9 Pulse Troubleshooting SR SEKSE EROS RET TT RIE TT I ST TTT A A9 000 Message Displayed on Synthesizer Go to Paragraph A9 Self Bias A9 100 A9 Squegging Clamp A9 200 A9 Modulator Selection A9 300 A9 Integrate Hold Switch A9 400 A9 Slow Pulse Drive A9 9000 A9 Pulse Troubleshooting 1 A9 100 Perform the following key sequence 1 Press PRESET 2 3 Gro OE Ensure when viewing the waveform that the input to the oscilloscope is DC coupled An AC coupled input may distort the waveform Continue Go To A9 9000 2 A9 Pulse Troubleshooting A9 101 YO V GHz Go To A13 9000 Continue A9 102 There is an open on the motherboard between XA9J2 56 and XA1332 56 Verify this with an ohmmeter Is jumpering the open an acceptable repair ag Go To A22 9000 Continue A9 103 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A9 Pul
147. he faulty connection or replace the faulty part W54 FL2 W51 AT3 Isolate and replace the faulty component and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab To check for excessive loss in a cable or filter connect the component input to a known good signal for the frequency bands in question see the block diagram 12 A6 Sampler Troubleshooting PELA located behind the Troubleshooting Block Diagrams tab and test the output Over the frequency range of 2 0 to 8 0 GHz the loss for a coaxial cable should be lt 2 0 dB the loss for a filter should be lt 4 0 dB A6 Sampler Troubleshooting 13 A6 500 A6 501 Refer to the calibration manual Perform the following adjustments and return A6 VCO Tune m A6 Sampler Match m A6 Loop Gain a A6 IF Gain Were you able to perform the adjustments Go To A6 9000 Continue Perform the following key sequence E Select Se Press Use the rotary knob to review the results of the A6 self tests If any A6 self tests fail go to A6 9000 Otherwise go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 14 AG Sampler Troubleshooting A6 9000 Replace the A6 assembly Adjustments Required Troubleshooting Foldout Biock 1 Perform Adjustments xLocated in front of the Special Cases tab Adjustments Successful A6 Sam
148. he following setup Press DE Press GHz Press ED Press SINGLE To make the measurement repeatedly press SINGLE TTL should be present that goes low for about 5 seconds then high each time you press SINGLE VOLTMETER SYNTHESIZER NOTHERACARG Gir Aa G KO pi Ca PANDO Ps aeaactinnnooce JE Ssec TTL LOW THEN TTL HIGH LSWPLED mn FRONT OF INSTRUMENT Go To A14 9000 Continue 48 Instrument Level Troubleshooting ILT 3171 Repeatedly press SINGLE You should see a 5 second TTL low VOL TNE TER SYNTHESIZER MOTHERBOARD 49 BRON CABLE CONNECTOR FRONT OF INSTRUMENT Continue Go To ILT 3190 ILT 3180 There is an open on the motherboard between XA14J2 7 and A22J2 34 Verify this with an ohmmeter Is jumpering an acceptable repair au Go To A22 9000 Continue ILT 3181 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab instrument Level Troubleshooting 49 ILT 3190 ILT 3200 ILT 3201 There is a fault associated with the front panel processor assembly A3 keyboard A1 or the interconnecting cables W3 motherboard to A3 or W5 A3 to Al Either check the ribbon cables replace the appropriate assemblies or both If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem Perform the fol
149. hooting 37 A15 1370 A15 1371 A15 1380 38 A15 CPU Troubleshooting Did all the indicators turn on temporarily and then turn off gt Go To 44 9000 Go To A5 9000 Perform the following setup 1 Set the line power switch to STANDBY 2 Using the disassembly instructions carefully remove the RF deck A20 3 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off aq Continue Go To A20 9000 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A20 assembly Go To A15 8500 Perform the following setup 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Remove the front panel and disconnect W2 and W3 the ribbon cables connecting A2 and A3 to the A15 1381 A15 1385 motherboard Refer to the disassembly procedures as needed Temporarily replace the front panel leaving the ribbon cables loose Reconnect line power the power on control is on A2 so the synthesizer will power up automatically even in standby and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off a Continue Go To A15 1385 Perform the following l 2 Set the line power switch to STANDBY Reconnect the ribbon cables for A2 and A3 Go To A15 3500 Perform the followin
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151. ibbon cable that connects A3 to the motherboard 5 Reinstall the front panel 6 Y Remove the rear panel and disconnect W31 the ribbon cable that connects the motherboard to A19 Refer to the disassembly procedures as needed Temporarily replace the rear panel leaving the ribbon cable W31 loose Take great care to ensure that the ribbon cable is not in contact with any line power wires or connections 8 Reconnect the line power cord 9 Set the line power switch to ON 10 Press SERVICE 11 Select E 12 Press 13 Select Di Continue Go To A19 9000 A15 105 Perform the following setup 1 2 3 Press 231 ENE ENTER Set the line power switch to STANDBY Disconnect the line power cord Wait for all the indicators in the power supply section to go out Reconnect W31 the ribbon cable that connects A19 to the motherboard Remove the RF deck Refer to the disassembly procedures as needed Reconnect the line power cord Set the line power switch to ON Press PRESET PRESET SERVICE Ignore all unleveled A15 CPU Troubleshooting 5 A15 120 6 A15 CPU Troubleshooting Go To A15 8500 Go To A20 9000 One of the following assemblies is defective w A4 fractional n m A5 YO loop m A7 reference n 9 pulse A10 ALC m All FM driver e A12 SY TM driver Al3 YO driver w A14 sweep generator Replace any one of the assemblies and perform the followi
152. ight rear of the instrument by the fan YOLTAETER SYNTHESIZES NOTHERKGRRE Go To A16 716 Continue A16 715 The fan is either defective or the instrument has an intermittent connection Replace the fan and then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A16 716 Reconnect the fan There is an open in the motherboard between one of the following two points m XA16J1 1 and A22J11 3 m XA16J1 41 and A22J11 1 28 A16 A17 A18 Troubleshooting A16 717 A16 718 A16 720 Is a jumper wire on the motherboard an acceptable repair I Go To A22 9000 Continue Repair the motherboard and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Do the following 1 Set the line power switch to STANDBY 2 Disconnect the instrument from ac line power 3 Wait for all the indicators in the power supply section to go out 4 Reconnect the fan Go to A16 9000 Do the following 1 Set the line power switch to STANDBY 2 Disconnect the instrument from ac line power 3 Wait for all the indicators in the power supply section to go out 4 Reconnect the fan 5 Remove A18 6 Check fuse A18F1 Is the fuse damaged Go To A16 9000 Go To A16 703 A16 A17 A18 Troubleshooting 29 A16 1000 With the line power switch set to ON and the top cover removed check the A16 power supply LEDs in the order shown Choose
153. ily and then turn off Continue Go To A6 9000 Perform the following setup 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Replace the A6 assembly removed in the previous step and reconnect all cables 5 Using the disassembly instructions remove the front panel and disconnect W2 the ribbon cable that connects the motherboard to A2 Temporarily replace the front panel leaving W2 loose Reconnect line power the power on control is on A2 so the synthesizer will power up automatically even in standby and observe the indicators on A15 I oS Did all the indicators turn on temporarily and then turn off Continue Go To A2 9000 Perform the following setup 1 Disconnect the line power cord 2 Wait for all the indicators in the power supply section to go out 3 Remove the front panel 4 Reconnect W2 to A2 A15 CPU Troubleshooting 25 5 Disconnect W3 the ribbon cable that connects A3 to the motherboard 6 Temporarily replace the front panel leaving the ribbon cable loose Reconnect the line power cord Repeat the power on sequence and observe the indicators on A15 OO I Did all the indicators turn on temporarily and then turn off Continue Go To A3 9000 Warning When the instrument is connected to ac line power or the A18 high voltage neon indicator is on there are voltages pre
154. in at each end of the cable REAR PANEL SMI CONNECTOR W235 o Sep on ILT 7703 Replace the cable W23 that connects the rear panel SMI input to the A10 assembly and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Continue Go To ILT 7704 ILT 7704 An SMI or ALC connection does not seem to be a problem Go to paragraph ILT 7800 Instrument Level Troubleshooting 87 ILT 7705 ILT 7800 ILT 7801 Either the rear panel SMI A19 or the ribbon cable W23 is faulty Inspect the ribbon cable Replace the A19 assembly go to A19 9000 or replace W23 as required and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Before performing this check press and select I Wait until the instrument has completed the tracking process Using the source module User s Handbook determine the range of frequencies and power levels provided by the synthesizer Set the synthesizer for a manual sweep over the specified frequency range at the specified power POER METE FRONT REAR PANEL S Ur F OUTPUT ao Go To ILT 2240 Continue Since the previous tests didn t clearly isolate the problem the following is a prioritized list of the most likely causes of failure 1 Using the source module User s Handbook verify that the connections between the source module and the synthesizer are correct 2 Front Rear Panel SMI
155. ing Reference for additional information Once you have created a frequency list or have set up for alternating registers then exercise the instrument and check for unlock failures The following example creates a frequency list that steps from 200 to 500 MHz in 10 steps The instrument will dwell at each frequency for 500 ms The list is saved to register 1 The instrument s fault and unlock indicators are monitored Finally a ramp sweep is alternated with a list sweep 1 Press FREQUENCY MENU 8 Special Cases clears any current list gt O DON Da 10 11 12 13 14 Press SAVE ERE 1 ENTER Saves the list t to register 1 Now to view the instrument s state 15 16 17 18 19 Select Uni major loops see SC 220 for more information The following is an example of a setup for alternating registers One will be the frequency list saved to register 1 in the previous example the other will be the preset state of the instrument an analog sweep 20 Press PRESET SYSTEM the instrument should be sweeping normally 21 Select I Fre AS 22 You should now see the sweep indicator flashing as it switches between the two setups e 3 asterisk on Special Cases 9 C 220 Direct Control and Monitoring Direct control and monitoring allow you to test or monitor hardware in a particular state Since you have some control over the individual modules
156. ior to the Special Cases tab A2 1305 GSCILLOSCOFE q Go To A15 9000 Continue A2 Source Module Interface Troubleshooting 7 A2 1306 There is an open on the motherboard between A22J1 31 and XA15J1 1 Verify this with an ohmmeter Is jumpering an acceptable repair a 4 Go To A22 9000 Continue A2 1307 Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A2 1310 Check all signals listed below for TTL pulses at XA15J1 Location XA15J1 12 XA15J1 52 XA15J1 13 XA15J1 53 XA1531 14 XA15J1 54 XA15J1 15 XA15J1 55 If one or more signals do not have TTL pulses the test has failed If all signals have TTL pulses the test has passed aq A he 5 Go To A15 9000 Continue 8 A2 Source Module Interface Troubleshooting A2 1311 A2 1312 A2 1315 Check all signals listed below for TTL pulses at XA15J1 There is an open on the motherboard data bus between A22J1 and XA15J1 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue Select the failing signals and install jumpers as required Signal A2 Location A15 Location A2231 22 XA15J1 12 A2231 21 XA15J1 52 A2231 20 XA15J1 13 A22J1 19 XA1531 53 A22J1 18 XA1531 14 A22J1 17 XA15J1 54 DB6 A22J1 16 XA15J1 15 A22J1 15 XA15J1 55 When the repair is complete go to the Troubleshooting Fol
157. is selected and Function External sweep trigger is selected n improper external trigger is selected Single sweep is selected Discontinue use of the user preset for the remainder of your troubleshooting Go to ILT 112 82 Instrument Level Troubleshooting ILT 7500 The source module makes three connections with the HP 8360 series synthesizer m The source module interface m The RF output The external ALC connection This is the shielded connection that is part of the SMI connector If you are using a rear panel source module interface go to ILT 7700 If you are using a front panel source module interface continue with ILT 7600 ILT 7600 Using either an oscilloscope or a voltmeter check the following voltages at the front panel SMI connector es ae Did all voltages pass a 4 Go To A2 9000 Continue instrument Level Troubleshooting 83 ILT 7601 Perform the following setup m Press PRESET m Press SWEEP TIME 0 SEC pe Using an oscilloscope or a voltmeter check the following voltages on front panel SMI connector Note that pin 12 is a sweep ramp To adjust the sweep time use the front panel controls if you use an oscilloscope try a sweep time of approximately 100 ms Measurement Pine 480 Vac i Pin 12 O to 10V Sweep Ramp Did all voltages pass q Go To ILT 7605 Continue 84 Instrument Level Troubleshooting ILT 7602 IL T 7603 I
158. isconnect the instrument from line power 2 Wait for all the indicators in the power supply section to go out 3 Carefully remove A18 and discharge all the large capacitors 4 Check the fuse on A18 A18F1 Is A18F1 good Continue Go To A18 9000 12 A16 A17 A18 Troubleshooting A16 321 Reinstall A16 Then measure the resistance of XA1631 36 to ground YOLTRETER SYNTHESIZER MOTHERBOARD Continue Go To A18 9000 A16 322 Remove A16 Then measure the resistance of XA16J1 36 to ground VOL TMETER SYNTHESIZER MATHEREGARD KTLITTELEE pones COPA sacdatHKFRNADSG z a g Y A FRONT OF INSTRUMENT 1A Continue Go To A16 9000 A16 A17 A18 Troubleshooting 13 A16 323 Remove the front panel completely Refer to the disassembly procedures Measure the resistance of XA16J1 36 to ground YOLTRETER SYNTHESIZER MOTHERBOARD Go To A16 329 Continue A16 324 Connect W2 from the source module interface assembly A2 to the motherboard A22 Then measure the resistance of XA16J1 36 to ground VOL TRETER SYNTHESIZER MOTHERRORRE ha geaosereoa aso QA PA it Go To A2 9000 Continue 14 A16 A17 A18 Troubleshooting A16 325 A16 329 A16 360 Do the following 1 P Connect W3 from the front panel processor A3 to the motherboard A22 Disconnect the two ribbon cables W1 W4 that connect the A3 front panel processor to the A21 display Measure the resi
159. isplay Troubleshooting 1 A21 9000 Replace the A21 assembly Adjustments Required Troubleshooting Perform Foldout Adjustments Block 1 xLocated in front of the Special Cases tab Adjustments Successful 2 A21 Display Troubleshooting A22 Motherboard Replacement ee AE A22 000 There are no motherboard specific self tests If you think the problem with your instrument may originate on the A22 assembly go to Instrument Level Troubleshooting RRR a A22 9000 If you suspect an open trace verify it with an ohmmeter before replacing A22 To replace the motherboard assembly see Disassembly and Replacement Procedures in the Service manual Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A22 Motherboard Replacement 1 nF ee ors eR v re Meter erases meme ereuereesee ve eres Pee tesen em een AS EE sises se Pesse A23 10 MHz Reference Replacement ELLE TE AN I OG OI E DE A O ER A23 000 The 10 MHz reference standard is shipped with a cable that is not used When replacing the reference standard remove this cable and solder cable W30 from your old reference standard in its place The disassembly and replacement procedures show this cable Go to A23 9000 for A23 replacement A23 10 MHz Reference Replacement 1 A23 9000 Replace the A23 assembly
160. istance of the 40Vde supply to ground XA16J1 62 to ground Replace the assembly that causes a resistance measurement of lt 1002 Also check the 40V fuse on A16 and replace it if defective If no assembly causes a low resistance measurement you may have removed the defect in the disassembly process or the problem may be intermittent Go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A16 4220 Check the 40V fuse on A16 Is the fuse defective ag Go To A16 7000 Continue A16 4221 Do the following 1 Replace the defective fuse 2 Install A16 3 Connect the instrument to line power using an isolation transformer 4 Set the line power switch to ON Is the green A16 40V LED on ay Go To A16 7000 Continue Replacing the fuse seems to have fixed the problem but this simple solution is suspect You may want to monitor the instrument for several minutes with the covers on to insure that an intermittent problem does not exist Go 40 A16 A17 A18 Troubleshooting A16 4300 A16 4301 to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Do the following if not already performed 1 Set line power switch to STANDBY 2 Disconnect the instrument from line power 3 Wait for all the indicators in the power supply section to go out 4 Remove A16 Measure the resistance of the 22Vdc supply to ground XA16J1 2
161. ith the ALC loop open Continue with the following sequence 1 Press POWER LEVEL 2 Use the rotary knob to set the ALC for maximum measured power 3 Using the rotary knob the measured RF power should be adjustable from lt 17 to gt 13 dBm from 2 to 20 GHz and from lt 17 to gt 7 dBm from 20 to 26 5 GHz 4 Press cw 5 Press the up arrow increments frequency COs O Y ra Repeat steps 1 through 5 until the CW frequency equals 26 5 GHz HP 836314 or 20 GHz HP 836214 If there is an unleveled condition at a specific frequency set that CW frequency and repeat steps 1 through 3 System Troubleshooting 15 SYS 651 16 System Troubleshooting POHER gt Disconnect W45 from A28 SL N SD ERA M EI 20 to 26 5GHz HP 83631A MI 2 0 to 20GHz HF 83621A Continue Go To SYS 653 Perform the following setup Ce DD oom GH OF amp Set the power switch to standby Reconect any disconnected cables Remove W57 which connects the AM modulator A38 to the amp multiplier A28 Turn power on Press ara Select Leveling Press cw Press 2 GHz The following sequence exercises direct control over the power level with the ALC loop open Continue with the following sequence i pA Press POWER LEVEL Use the rotary knob to set the ALC for maximum measured power Using the rotary knob the measured RF power should be adjustable from lt
162. ither repair or replace products which prove to be defective For warranty service or repair this product must be returned to a service facility designated by HP Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to HP from another country LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse or operation outside of the environmental specifications for the product or improper site preparation or maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES HP SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY Assistance Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard Products For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are provided at the back of this manual Copyright Hewlett Packard Co 1400 Fountaingrove Pkwy Santa Rosa CA 95403 U
163. l Go To A10 9000 Continue 10 A10 ALC Troubleshooting A10 401 SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Continue Go To A15 9000 A10 402 There is an open on the motherboard between XA10J2 55 and XA15J2 27 Verify this with an ohmmeter Is jumpering the open an acceptable repair ay Go To A22 9000 Continue A10 403 Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A10 ALC Troubleshooting 11 A10 500 Are there any cables connected to the rear front panel SMI source module interface connectors ay Go To A10 9000 Continue A10 501 Perform the following setup Remove all connections to the SMI inputs Es 2 Press PRESET 3 Select Selftest Mar 4 5 one nad AAA A TS TE Press 37 ENTER Select rari Go To A10 9000 Continue A10 502 The problem appears to be partially solved Remove any remaining connections and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 12 A10 ALC Troubleshooting A10 600 Perform the following setup EE 2 Select 3 Press 131 ENTER 4 Select Loop 5 wes p Select LUN LUNLVLED_LOW FRONT OF INSTRUMENT Go To A10 9000 Continue A10 ALC Troubleshooting 13 A10 601 boscana SYNTHESIZER MOTHERBOARD ree nit tet LUNLVLED HI LUNLVLED
164. l the indicators in the power supply section to go out Remove A16 A16 A17 A18 Troubleshooting 65 Measure the resistance of the 8 Vde supply to ground XA16J1 7 8 47 and 48 to ground SYNTHESIZER MOTHERBOARN FRONT OF INSTRUMENT Continue Go To A16 4720 A16 4703 Remove the following assemblies m A4 fractional N m A5 YO phase detector m A7 reference m 9 pulse m All FM driver u A12 SY TM driver A13 YO driver m A14 sweep generator m 15 microprocessor a A6 sampler Note i Be sure to disconnect the rigid cable line connected to 3 the input of A6 before removing A6 Otherwise damage to the cable A6 and possibly the filter FL2 can occur EEE 66 A16 A17 A18 Troubleshooting Measure the resistance of the 8 Vdc supply to ground XA16J1 7 8 47 and 48 to ground SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Continue Go To A16 4710 A16 4704 Refer to the disassembly procedures to remove the RF deck Measure the resistance of the 8 Vde supply to ground XA16J1 7 8 47 and 48 to ground SYNTHESIZER NOTHERROARG Go To A16 4730 Continue A16 A17 A18 Troubleshooting 67 A16 4705 Refer to the disassembly procedures and reinstall the RF deck in the service position Remove the ribbon cables that connect the microcircuits to the RF deck Measure the resistance of the 8 Vdc supply to ground XA16J1 7 8 47 and 48 to ground SYNTHESIZER MOTHERADARO FRO
165. lity perform the ADC Adjustment using the automated tests software supplied with the synthesizer An HP 9000 series 200 300 desktop computer and HP BASIC are required in addition to the software Follow the procedure given in Automated Tests in the Service manual After completing the adjustment go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab This new A15 assembly is defective also Remove this A15 assembly and reinstall the original defective A15 assembly You must have the original A15 assembly because it contains all the calibration data for the instrument Go to A15 9000 and replace A15 again If the new A15 is not defective you will be instructed to transfer the calibration data to that assembly A15 CPU Troubleshooting 47 A15 9020 48 A15 CPU Troubleshooting You have lost both EEROM and battery backed up RAM This means that all hardware configuration data and all firmware correction are lost Before the instrument will perform properly you must complete the following steps in the order given 1 Replace the A15 assembly Install any firmware diagnostic patches as required the installation instructions for A15 should indicate which patches are required and how to install them Using the instrument level troubleshooting ILT 000 run the diagnostics to isolate any additional problems Recreate the hardware configuration data you will need to contact Hewle
166. lowing setup L Press BRESET GARD O Gu 2 Press Ghz 3 Press 00 You should see a 100 msec 0 0 to 10 0V ramp OSCILLOSCOPE REAR PANEL Go To ILT 3202 Continue Nothing seems to fail If an intermittent or non linear sweep output failure exists the most likely failure is the sweep generator assembly A14 Less likely failures are the rear panel SMI A19 and the ribbon cable W31 If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem 50 Instrument Level Troubleshooting ILT 3202 SYNTHESIZER MOTHERBOARD RIBBON CABLE CONNECTOR 50 2 REAR OF INSTRUMENT LY Continue Go To ILT 3160 ILT 3203 3 SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Go To A14 9000 Continue instrument Level Troubleshooting 51 ILT 3204 There is an open on the motherboard between XA14J2 4 an A22J8 31 Verify this with an ohmmeter Is jumpering an acceptable repair aq Go To A22 9000 Continue ILT 3205 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab ILT 3300 Turn the power switch to standby and remove the multiplier filter driver assembly A12 Inspect the DIP switch on the A12 assembly The switch should be set as indicated in the table below Upper Freq Limit Switch 1 Switch 2 Switch 3 OR seo avs av omes ef ome ems
167. lses the test has passed Go To A15 9000 Continue A19 1316 There is an open on the motherboard between XA15J1 and A22J8 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue 10 A19 Rear Panel Interface Troubleshooting A19 1317 A19 1320 Select the failing signals and install jumpers as required Signal A19 Location A22J8 57 A22J8 58 A22J8 55 A2238 56 A22J8 54 After you repair the opens go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Check all signals listed below for TTL pulses at XA15J1 Signal Location XA15J1 12 XA15J1 52 XA1531 13 XA15J1 53 XA15J 1 14 XA15J1 54 XA15J1 15 XA15J1 55 A19 Rear Panel Interface Troubleshooting 11 A15 Location XA15J1 7 XA1531 47 XA15J1 9 XA1531 49 XA15J1 10 If one or more signals do not have TTL pulses the test has failed If all signals have TTL pulses the test has passed Go To A15 9000 Continue A19 1321 There is an open on the motherboard data bus between A22J8 and XA15J1 Verify this with an ohmmeter Is jumpering an acceptable repair aq Go To 422 9000 Continue A19 1322 Select the failing signals and install jumpers as required Location Location DBO A2238 52 XA15J1 12 A22J8 51 XA15J1 52 A22J8 50 XA15J1 13 A2218 49 XA15J1 53 A22J8 48 XA15J1 14 A22J8 47 XA15J1 54 A22J8 46 XA1531 15 A22J8 45 XA15J1 55
168. ly procedures to remove the rear panel and disconnect ribbon cable W31 from the motherboard Measure the resistance of the 5 VAUp to ground XA16J1 76 to ground Is the resistance gt 1 kQ ag Go To A22 9000 Go To A19 9000 A16 A17 A18 Troubleshooting 83 Ze 3 A 16 5000 1 Remove Ai6 Check the 22V plug in style fuse Replace the fuse if required Reinstall A16 Continue to the next step A16 5001 Is the A16 22V STBY LED on ag Go To A16 9000 Continue A16 5002 Do the following 1 Ze 3 ot A gt Set the line power switch to STANDBY Remove A16 Connect the instrument to line power using an isolation transformer Set the line power switch to ON Measure the voltage of the 22 Vdc supply at XA16J1 4 and 44 84 A16 A17 A18 Troubleshooting Is the measured voltage between 23 and 55 V de with less than 2 V de ripple TARET TI TITE Y annaas gt SPAR agsosanosonnen PO am m e dr 23 to 55Vde FRONT OF INSTRUMENT Go To A17 9000 Continue A16 5003 Reinstall A16 Measure the voltage of the 22 Vdc supply at XA16J1 4 and 44 Is the measured voltage between 23 and 55 V de with less than 2 V de ripple SYNTHESIZER HOTHERBOARN r A m m a a an a a m an AAA anaggan tanga cornada PE 23 to 55Vde FRONT OF INSTRUMENT Continue Go To A16 9000 A16 A17 A18 Troubleshooting 85 A16 5004 The problem is most likely A16 go to
169. m may be intermittent Also check the 5V fuse on A16 and replace it if open Go to Troubleshooting Foldout block 1 located just prior to the Special Cases tab A16 A17 A18 Troubleshooting 55 A16 4520 Check the 5V fuse on A16 Is the fuse open Go To A16 7000 Continue A16 4521 Do the following 1 Replace the defective fuse 2 Install A16 3 Connect the instrument to line power using an isolation transformer 4 Set the line power switch to ON Is the green 5V LED on 3 Go To A16 7000 Continue Replacing the fuse seems to have fixed the problem but this simple solution is suspect You may want to monitor the instrument for several minutes with the covers on to insure that an intermittent problem does not exist Go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 56 A16 A17 A18 Troubleshooting A16 4530 Refer to the disassembly procedures to remove the rear panel and disconnect ribbon cable W31 from the motherboard Measure the resistance of the 5 Vdc supply to ground XA16J1 18 19 58 and 58 to ground SYNTHESIZER MOTHERBOARD Ent DOSurNoaDsa as gt AY TI sara fonaganasananat P z790 FRONT OF INSTRUMENT Go To A22 9000 Go To A19 9000 A16 4600 Measure the voltage of the 5 Vdc unregulated supply from A17 to at XA16J1 15 16 55 and 56 SYNTHESIZER MOTHERBOARD CCOO asaboa Me oa janprananoacarRa
170. m present The failure occurs each and every time a particular circumstance or sequence of events occurs The opposite of repeatable is intermittent The failure is reported by the firmware diagnostics If a failure is reported after running the full self tests then the failure is detected regardless of whether or not the failure has been isolated Don t use Special Cases unless Instrument Level Troubleshooting did not isolate the failure 4 Special Cases After you have classified your failure use this table to determine which techniques to use to isolate your failure FAILURE PARAGRAPHS Repeatable Detected Yes Yes or No Yes or No As an example if an instrument has an intermittent loss of RF power out the front panel maybe it fails once a day that hasn t been detected by the diagnostics you would use the techniques explained in paragraphs 5C 210 C 250 SC 230 and C 220 This is because it is a nonsystem failure nonrepeatable intermittent failure and undetected by the diagnostics Special Cases 5 SC 210 Looping and Logging The service looping and logging techniques can be used to localize an intermittent failure Looping repeatedly cycles the instrument through a series of states or tests Logging reports any detected failures These techniques work well with temperature cycling Other techniques that may be useful are frequency list mode and alternate registers The list mode and alternat
171. most likely cause of failure Each paragraph indicates several possible causes of failure in order of most probable cause listed first Data Point Failures Go To Paragraph 2 303 GHz only SYS 105 5 7499 GHz only SYS 106 6 8009 GHz only SYS 106 7 4 GHz only SYS 107 Switching Test only SYS 108 2 303 GHz and 6 8009 GHz only SY S 109 All Other Combinations SYS 110 SYS 105 1 YO adjustments 2 Sampler adjustments 3 Sampler A6 4 YO A26 System Troubleshooting 5 SYS 106 SYS 107 SYS 108 SYS 109 SYS 110 SYS 120 6 System Troubleshooting ND ort gpa Sampler adjustments Sampler A6 YO A26 YO adjustments RF path from the mod splitter A25 to the sampler A6 This path includes FL2 W51 W54 path and A35 not present in some instruments YO A26 YO driver A13 YO phase detector A5 YO driver A13 YO A26 Sampler A6 Sampler adjustments Using the troubleshooting block diagram located at the end of Special Cases examine the YO loop for the cause of failure L 2 3 4 RF path from the directional coupler A39 to the sampler A6 YO sampler and YO phase detector adjustments Sampler YO A26 or mod splitter YO phase detector A5 or YO driver 413 Replace W14 Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab SYS 101 lemen tOrmSec Perform the
172. motherboard 6 Using an ohmmeter check W31 Is W31 Faulty Go To A19 9000 Continue A19 8100 Replace W31 You may also want to replace A19 Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A19 Rear Panel Interface Troubleshooting 15 A19 9000 Replace the A19 assembly Adjustments Required Troubleshooting Perform Foldout Adjustments Block 1 Located in front of the Special Coses tab Adjustments Successful 16 A19 Rear Panel Interface Troubleshooting C A20 BF Interface Troubleshooting A20 000 Message Displayed on Synthesizer Go to Paragraph A20 RF Interface 8V A20 100 A20 RF Interface Troubleshooting 1 A20 100 A20 101 Perform the following voltage checks H any measurement fails the test has failed If all measurements pass the test has passed Name Limits Location 15VDC 14 7 to 15 5 XA20J1 24 25 59 60 15VDC 14 5 to 15 6 XA2011 26 61 40VDC 39 4 to 40 6 XA20J1 27 62 5 VA 5 0 to 5 3 XA20J1 31 32 66 67 5VD 5 0 to 5 3 XA20J1 13 48 5VAUp TTL High XA20J1 68 7 75 to 8 25 XA20J1 14 15 49 50 A Go To A20 120 Continue Perform the following setup ED asterisk on following table 7 If any measurement fails the test has failed If all measurements pass the test has passed 8 To exit the test select Le 2 A20 RF
173. n the motherboard between XA13J2 2 and XA12J2 21 Verify this with an ohmmeter Is jumpering the open an acceptable repair Go To A22 9000 Continue A12 111 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 4 A12 Multiplier Filter Driver Troubleshooting A12 200 Perform the following key sequence PRESET SERVICE 1 Press FRONT OF INSTRUMENT Continue Go To A12 9000 A12 Multiplier Filter Driver Troubleshooting 5 A12 201 SYNTHESIZER NOTHERBGOARD FRONT OF INSTRUMENT Go To A14 9000 Continue A12 210 There is an open on the motherboard between XA1231 24 and XA14J1 27 Verify this with an ohmmeter Is jumpering the open an acceptable repair a Go To A22 9000 Continue A12 211 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 6 A12 Multiplier Filter Driver Troubleshooting A12 300 Perform the following key sequence 1 Press 2 Select S 3 Press 16 4 Select L 6 Continue Go To A12 9000 A12 Multiplier Filter Driver Troubleshooting 7 A12 301 Go To A14 9000 Continue A12 310 There is an open on the motherboard between XA12J2 35 and XA14J2 42 Verify this with an ohmmeter Is jumpering the open an acceptable repair a 4 Go To A22 9000 Continue A12 311 Install a jumper and go to the Troubleshooting Foldout block 1 loc
174. n the test is samplers the instrument will begin logging to the display until it encounters another fai ailure 21 To stop looping and logging again press Loo 20 In the following example you will run a test and log all of the test results to a printer As in logging to the display you can choose to log all of the data or fail only data Logging data to a printer can be useful in situations that require testing over a long period of time or during temperature cycling 22 Connect the printer to the synthesizer s HP IB port 23 Set the printer to listen only and address 0 24 Cycle the printer power Fae 25 Select Ot en er asterisk on 26 Select 3 27 Press ser asterisk on Special Cases 7 32 Press PRIOR 33 Select Loop 34 Select I The printer will not print unless the synthesizer fails this test 35 Remove the instrument top cover and carefully remove the coax cable from A5J1 the left most coax cable connected to A5 Notice that the printer A meme begins to log the failures Frequency List and Alternate Registers These features may be used to replicate a problem Frequency list allows you to set up an arbitrary list of frequencies power levels and dwell times Alternate registers causes the synthesizer to alternate on successive sweeps between the present instrument state and a second instrument state stored in an internal register See the Operating and Programm
175. nce OT gt G N Select I Verify a signal of lt 700 mV However expect some portions of the signal to rise to levels of up to 15 Vdc This is not a failure as long as the signal is primarily lt 700 mV Go To A11 9000 Go To A11 120 A11 EM Driver Troubleshooting 3 A11 110 Go To A15 9000 Continue A11 111 There is an open on the motherboard between XA11J1 26 and XA15J1 43 Verify this with an ohmmeter Is jumpering the open an acceptable repair 3 gt g Go To A22 9000 Continue A11 112 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 4 Aii FM Driver Troubleshooting A11 120 Verify a signal of lt 700 mV However expect some portions of the signal to rise to levels of up to 15 V dc This is not a failure as long as the signal is primarily lt 700 mV Continue Go To A15 9000 A11 121 There is an open on the motherboard between XA11J1 51 and XA15J1 58 Verify this with an ohmmeter Is jumpering the open an acceptable repair Go To A22 9000 Continue A11 122 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A11 FM Driver Troubleshooting 5 A11 200 Perform the following key sequence EATER AS Go To A11 9000 Continue 6 A11 FM Driver Troubleshooting A11 201 SYNTHESIZER NOTHERRGARD Continue Go To A15 9000 A11 202 There is an o
176. nclude the following 1 Keyboard A1 2 Front panel processor A3 3 Cables W3 W5 If the display updates slowly examine and modify if required calibration constant 554 using the following procedure Press Select 2 Press 554 ENTER Calibration constant 554 should be set to 245 If it is not continue with the following Select Press Select If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem Instrument Level Troubleshooting 33 ILT 3060 Check the continuity from the front panel external ALC input rear panel for option 004 to the end of W9 connects to A10J4 VOL THE FER Sada dla E ST TE ll lll ela PENINA e m e i m n om mme x_x_ tUI IIA la soncacassd P MITE annan OBS sersanasonnaroa OP DUAL MODULATOR N D p O Disconnect W32 From A38 lt 5Vdc Continue Go To A10 9000 ILT 3061 Replace the cable W9 that connects the front panel external ALC input to A10J4 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab ILT 3070 Using either an oscilloscope or a voltmeter check the following voltages at the front panel SMI connector Measurement 45 2 Vde Location Pin 5 Pin 10 18 19 20 15 0 Vdc TTL High 34 Instrument Level Troubleshooting ILT 3071 Did all voltages
177. ne power cord Wait for all the indicators in the power supply section to go out Remove the front panel and disconnect W2 and W3 the ribbon cables connecting A2 and A3 to the motherboard Refer to the disassembly procedures as needed Temporarily replace the front panel leaving the ribbon cables loose Reconnect line power the power on control is on A2 so the synthesizer will power up automatically even in standby Observe the red indicators on A15 A15 281 A15 285 Are all A15 indicators off sg Continue Go To 415 285 Perform the following 1 Set the line power switch to STANDBY 2 Reconnect the ribbon cables for A2 and A3 Go To A15 8500 Perform the following 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out Reconnect W3 the ribbon cable that connects the motherboard to A3 Temporarily replace the front panel Reconnect the line power cord e O PUN o borg g th 10 Go To A3 9000 Go To A2 9000 A15 CPU Troubleshooting 15 A15 300 Perform the following setup 1 Set the line power switch to STANDBY 2 Remove the following assemblies m A4 fractional n m A5 YO loop m A7 reference a A9 pulse s A10 ALC m All FM driver m A12 SYTM driver A13 YO driver u A14 sweep generator 3 Set the line power switch to ON A15 301 16 A15 CPU Troubl
178. ng 5 A10 204 There is an RF output problem This failure made the A10 diagnostics fail Before we can go further this RF problem must be isolated Go to ILT 2240 6 A19 ALC Troubleshooting EEE U A a ET A10 300 Perform the following setup 1 Press Select vi oo AG N v 00 ad SERVICE at XA10J2 4 should be 4 5V 1 5V 10 The voltage at XA10J2 4 should be 0 0V 1 5V EG LG S4900X 030404030 tet C O Y Continue aganaga FRONT OF INSTRUMENT Go To A10 9000 A10 ALC Troubleshooting 7 A10 301 Perform the following setup Ct 5 fb asterisk 4 5V 1 5V 0 ID gt 10 The voltage at XA14J2 1 should be 0 0V 1 5V 11 12 The voltage at XA14J2 1 should be 9 0V 1 5V 13 Select Cont K VOLTRETER SYNTHESIZER MOTHERBOARS 2 hogocagae Ekman 2 LE ME EEG Go To A14 9000 Continue 8 A10 ALC Troubleshooting A10 302 There is an open on the motherboard between XA10J52 4 and XA14J2 1 Verify this with an ohmmeter Is jumpering the open an acceptable repair ag Go To A22 9000 Continue A10 303 Install a jumper Then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A10 ALC Troubleshooting 9 A10 400 Perform the following setup PRESET SERVICE Select I 1 Press 2 3 Press 4 3 SYATHESTZER MOTHERBOARD i
179. ng test 1 Press PRESET 2 Select E 3 Press 231 4 Select Do Tes Er A av ANS ark Sire ara Seman a Y ma ring AT preg ver PATT If the test fails the assembly just replaced is defective If the test does not fail replace another assembly and repeat test number 231 When the defective assembly is identified go to the 9000 paragraph for that assembly for replacement instructions For example for A4 go to A4 9000 for A5 go to A5 9000 and so on A15 200 Warning Perform the following setup 1 Set the line power switch to ON Ze 3 4 Press 2 5 Select A e a NA A tp est ole asterisk on 6 Press 7 Select E 8 Press NA a cosy AS a 9 Use the following table to determine your next step Only strobe 0 fails A15 210 Only strobe 1 fails A15 220 Only strobe 2 fails A15 230 Only strobe 3 fails A15 240 Only strobe 4 fails A15 250 Only strobe 5 fails A15 260 Only strobe 6 fails A15 270 Only strobe 7 fails A15 280 All other strobe failures A15 8500 ee When the instrument is connected to ac line power or the A18 high voltage neon indicator is on there are voltages present that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service on this instrument with its protective covers removed E A15 CPU Troubleshooting 7 A15 210 Perform
180. nnect any disconnected cables 3 Disconnect W45 or W56 from the amplifier filter A29 as shown in the following figure 4 Set the line power switch to ON 5 Press PRESET GW ALO HP 8360 Troubleshooting HP 8360 Troubleshooting 6 Select 7 Press cw 8 Press 2 GHz The following sequence exercises direct control over the power level with the ALC loop open Continue with the following sequence 1 Press POWER LEVEL 2 Use the rotary knob to set the ALC for maximum measured power 3 Using the rotary knob the measured RF power should be adjustable from lt 28 to gt 0 dBm 4 Press cw 5 Press A increments frequency Repeat steps 1 through 5 until the CW frequency equals 26 5 GHz HP 83631A 51A or 20 GHz HP 836214 If there is an unleveled condition at a specific frequency set that CW frequency and repeat steps 1 through 3 PGHER METER Disconnect WHS or W56 From A29 SL Range From s 28dBm to z Odim M 2 0 to 26 5GHz HP 83631A 51A HF 83621A Continue Go To SYS 605 SYS 601 New add after SYS 600 Perform the following setup 1 Set the power switch to standby 2 Reconnect any disconnected cables Change B 2 11 2 12 Change B 3 Remove W61 which connects the amplifier multiplier A28 to the amplifier filter A29 Turn power on Press PRESET GW LO Select Lev Press Press 2 06 The following sequence exercises dir
181. nnect line power Set the line power switch to ON Observe the red indicators on A15 Are all A15 indicators off 9 Continue Go To A3 9000 Ow CO Dy cr When the instrument is connected to ac line power or the A18 high voitage neon indicator is on there are voltages present that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service on this instrument with its protective covers removed te Perform the following setup 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Remove the front panel and reconnect W3 the ribbon cable that connects A3 to the motherboard 5 Replace the front panel 6 Remove the rear panel and disconnect W31 the ribbon cable that connects the motherboard to A19 Refer to the disassembly procedures as needed 7 Temporarily replace the rear panel leaving W31 loose Take great care to ensure the ribbon cable is not in contact with any line power wires or connections 8 Reconnect line power 9 Set the line power switch to ON 10 11 12 Continue Go To A19 9000 A15 305 Perform the following 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Reconnect the A19 assembly removed in the previous s
182. ntact ay Go To ILT 2260 Go To RF 3290 ILT 2255 The most probable fault is a loose cable between A30 and the RF OUTPUT connector Use the block diagram to guide you in checking power levels between A30 and the RF OUTPUT connector Then use the block diagram to check the following items The RF OUTPUT connector The bridge detector RF 3090 The low power adjustment For abrupt power drop out only amplifier multiplier adjustments The amplifier multiplier RF 2890 If present the amp switch RF 3390 The amplifier filter adjustments The amplifier filter RF 2990 e GO ND m OO N GD OT 20 Instrument Level Troubleshooting ILT 2256 ILT 2257 If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem general power level problem exists The assemblies that affect a broad band of frequencies start with the bridge detector and end with J1 If a power level accuracy problem exists it is possible that the A10 assembly ALC is faulty There is no easy and effective way to continue testing without additional equipment The following is a prioritized list of the most probable causes 1 For power measurement level accuracy only the A10 assembly A10 9000 2 The RF OUTPUT connector 3 Hard lines between the A30 assembly and the RF OUTPUT connector 4 The bridge detector RF 3090 If these
183. nterpret the display as follows Label i CW MHz The frequency of the YO BAND The frequency band we are using 0 through 4 This indicates band 2 because the frequency is set to slightly more than 10 GHz 1 Select P D Fres The modules shown are checked for unlock failures If no unlock is found OK is displayed Special Cases 11 Sometimes it is useful to open up the ALC loop to keep it from railing Press ALC and select Lev E An UNLVLED indicator comes on because leveling ALC action is not functioning n normal operation this indicator means that the power requested is not available SC 230 Exchanging Assemblies Exchanging assemblies might be the only way to isolate some problems The following is a list of assemblies and the adjustments that may be required to make the synthesizer operational if the assembly is replaced If the adjustments are not performed failures may occur such as severe power loss or drop out failure to lock or sweep properly squegging and unleveled indications Perform the adjustments indicated in the following table in order to verify that you have eliminated the problem assembly Then to ensure that the synthesizer meets specifications go to Post Repair in the Service manual and perform the required adjustments and performance tests Assembly Adjustments Required Difficulty Equipment for Operation Required ADC Move Memory 415 9001 YO Loop Gain Sampler Assembly Am
184. o STANDBY 2 Disconnect the ac line power cord 3 Wait for all the indicators in the power supply section to go out 4 Remove A16 78 A16 A17 A18 Troubleshooting A16 4901 5 Measure the resistance of the 5 VAUp to ground XA16J1 76 to ground VOLTHETER SYNTHESIZER MOTHERBOARD Continue Go To A16 9000 Remove the following assemblies m A4 fractional N 2 A5 YO phase detector m T reference a A9 pulse a All FM driver m A12 SYTM driver a A13 YO driver m Al4 sweep generator w A15 microprocessor A16 A17 A18 Troubleshooting 79 Measure the resistance of the 5 VAUp to ground XA16J1 76 to ground __ YOLTHETER SYNTHESIZER KOTHERSGARD z CE S E E E E E a E Cal oan anwe POUR A i geascegoanencagoan gt 1KQ Continue Go To A16 4910 A16 4902 Refer to the disassembly procedures to remove the RF deck Also remove A6 Note ug Be sure to disconnect the rigid cable connected to the input of A6 before removing A6 Otherwise damage to the cable A6 and possibly the filter FL2 can occur 80 A16 A17 A18 Troubleshooting Measure the resistance of the 5 VAUp to ground XA16J1 76 to ground VOLTMETER SYNTHESIZER MOTHERBOARD 2 anDaaaeHRe aguas 6 asecarcann cado OPA 1KO Go To A16 4930 Continue A16 4905 Refer to the disassembly procedures and reinstall the RF deck in the service position Remove the ribbon cables that connect the microcir
185. ol over the power level with the ALC loop open Continue with the following sequence 1 Press POWER LEVEL 2 Use the rotary knob to set the ALC over its full range approximately 80 dBm to 0 dBm 3 Using the rotary knob the measured RF power should be adjustable from lt 8 to gt 13 dBm 4 Press cw 5 Press A increments frequency Repeat steps 1 through 5 until the CW frequency equals 26 5 GHz HP 83631A or 20 GHz HP 83621A If there is an unleveled condition at a specific frequency set that CW frequency and repeat steps 1 through 3 Range From 8dBm to 13dBrn Disconnect W45 From AJO j ase ona ai 2 0 to 26 5GHz HP 83631A A to 20GHz HP 83621A Continue Go To RF 3090 SYS 655 Replace W45 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab System Troubleshooting 19 SYS 700 1 Check the cabling associated with the amplifier multiplier A28 2 Replace the amplifier multiplier go to RF 2890 ag Go To RF 2490 Go To ILT 2257 a 20 System Troubleshooting 1 After Replacement or Repair Run Instrument Level Self Tests Did a self test the same as the origina failure Follow the instructions displayed on the synthesizer 2 After Adjustment Only Run Instrument Level Self Tests Did self test this failure the same as the original failure Go to paragraph AX 9000 Do applicable
186. on this instrument with its protective covers removed An isolation transformer must be used during all power supply troubleshooting procedures Observe all safety practices Remove all jewelry metal that can short to ground Line power is located at the rear of the instrument under the red plastic protective cover However dangerous voltages exist outside this area especially in the covered power supply section and the cable harnesses located at the rear of the instrument Before removing the power supply cover servicing any of the cables or harnesses or working in the proximity of these parts completely disconnect line power and wait for all power supply indicators to go off Follow this procedure anytime you install or remove assemblies or parts or otherwise physically service the instrument If your instrument does not have a red plastic WARNING cover at the bottom rear of the motherboard install one before continuing Completely disconnect line power before doing any servicing with the warning cover removed or damaged Also completely disconnect line power before installing or removing the warning cover Special Cases 3 SC 200 Classify Your Failure Classify your failure using the following definitions Failure System Repeatable Detected Definition The failure has only been demonstrated as a part of a system a collection of instruments In general the failure cannot be repeated or characterized without a syste
187. one or more self test failures Go to the paragraph shown on the synthesizer for the failure unless the message is A15 ROM tests In that case rather than the paragraph shown on the synthesizer go to A15 9020 A15 1210 When EEROM was lost most of the calibration data was saved by copying from battery backed up RAM However two types of data were not saved These data were test patches for the diagnostics and attenuator correction data Both sets of data will have to be recreated To recreate the attenuator correction data refer to the performance tests and adjustments For the test patches on the diagnostics refer to the appropriate service or installation notes A15 1300 Perform the following setup 1 Set the line power switch to ON and observe the 12 LEDs on the top edge of A15 2 When the 4 left most LEDs DS1 display 0011 observe and record the state of the right 8 LEDs DS2 and DS3 3 Find the state of the right 8 LEDs in the following table and go to the indicated paragraph A15 CPU Troubleshooting 31 A15 1310 A15 1320 A15 1330 A15 1340 A15 1350 A15 1360 A15 1370 A15 1380 A15 8500 Warning v When the instrument is connected to ac line power or the A18 high voltage neon indicator is on there are voltages present that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service on this instrument with its gt Y
188. ontinue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A7 Reference Troubleshooting 15 A7 1305 Go To A15 9000 Continue A7 1306 There is an open on the motherboard between XA7J1 4 and XA15J1 7 Verify this with an ohmmeter Is pe jumpering an acceptable repair aq Go To A22 9000 Continue A7 1307 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 16 A7 Reference Troubieshooting A7 1310 SYNTHESIZER MOTHERSORRA Go To A15 9000 Continue A7 1311 There is an open on the motherboard between XA7J1 29 and XA1531 47 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue A7 1312 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A7 Reference Troubleshooting 17 A7 1315 Go To A15 9000 Continue A7 1316 There is an open on the motherboard between XA7J1 31 and XA15J1 49 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue A7 1317 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 18 A7 Reference Troubleshooting A7 1320 Go To A15 9000 Continue A7 1321 There is an open on the motherboard between XA7J1 7 and XA15J1 10 Verify this with an ohmmeter Is jumpering an a
189. ontrol over the power level with the ALC loop open Continue with the following sequence 1 Press POWER LEVEL 2 Use the rotary knob to set the ALC over its full range approximately 80 dBm to 0 dBm 3 Using the rotary knob the measured RF power should be adjustable from lt 8 to gt 0 dBm HP 83651A or lt 8 to gt 10 dBm HP 83621A 31A Press cw 5 Press A increments frequency GM I COU oA ds Change B 2 13 Repeat steps 1 through 5 until the CW frequency equals 50 GHz HP 83651A 26 5 GHz HP 83631A or 20 GHz HP 83621A If there is an unleveled condition at a specific frequency set that CW frequency and repeat steps 1 through 3 Range From lt 8dBm to 0dBm HP 83651A Range From lt 8dBm to 2 10dBm POWER METER HP 83621A 31A Disconnect WES or W55 From AJO M 2 0 to 50GHz HP 83651A O to 26 5GHz HP 83631A 2 4 to 20GHz HP 83621A Continue Go To RF 3090 SYS 607 New add after SYS 606 Select your instrument s model and go to the paragraph indicated A mi Paragraph SYS 610 New add after SYS 607 Replace W45 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 2 14 Change B HP 8360 Troubieshooting HP 8360 Troubleshooting SYS 620 New add after SYS 610 Do the following 1 Set the line power switch to standby Reconnect any disconnected cables Disconnect W49 from A2
190. or A16 A17 A18 Troubleshooting 37 Measure the resistance of the 40 Vde supply to ground XA 1631 62 to ground SYNTHESIZER MOTHERSGARO Continue Go To A16 4210 A16 4204 Refer to the disassembly procedures to remove the RF deck Measure the resistance of the 40 Vdc supply to ground XA16J1 62 to ground VOLTHETER SYNTHESIZER HOTHERBOARD Go To A22 9000 Continue 38 A16 A17 A18 Troubleshooting A16 4205 A16 4206 TELLELELET ETT See Reinstall the RF deck in the service position Refer to the disassembly procedures Remove the ribbon cables that connect the microcircuits to the RF deck Measure the resistance of the 40 Vde supply to ground XA16J1 62 to ground VOLTHETER SYNTHESIZER HOTHERBOARN eaghooaens gt pagans 5 Go To A20 9000 Continue Reconnect the microcircuit ribbon cables one at a time while measuring the resistance of the 40 Vdc to ground XA16J1 62 to ground Replace the microcircuit that causes a resistance measurement of lt 1000 Also check the 40V fuse on A16 and replace it if open E no microcircuit causes a low resistance measurement you may have removed the defect in the disassembly process or the problem may be intermittent Go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A16 A17 A18 Troubleshooting 39 A16 4210 Reinstall the previously removed assemblies one at a time while measuring the res
191. ower on sequence and observe the indicators on A15 A15 CPU Troubleshooting 43 A15 1420 A15 8500 44 A15 CPU Troubleshooting Did all the indicators turn on temporarily and then turn by Go 4 ALS 8500 Go 4 A20 9000 One of the following assemblies is defective mw A4 fractional n a A5 YO loop m reference m AQ pulse m Al0 ALC All FM driver us A12 SY TM driver a A13 YO driver m A14 sweep generator Replace the assemblies one at a time Then check the display s operation If the display begins to operate incorrectly the assembly just replaced is defective If the test does not fail replace another assembly and repeat the process When the defective assembly is identified go to the 9000 paragraph for that assembly for replacement instructions For example for A4 go to A4 9000 for A5 go to A5 9000 and so on Perform the following 1 Set the line power switch to STANDBY 2 Replace any remaining assemblies that had been removed 3 Remove and replace A15 this resets the edge connector 4 Set the line power switch to ON 5 Press PRESET 7 Press 228 8 Press De ee Go To A15 9000 Continue A15 8501 Removing and replacing A15 has apparently fixed the problem Most likely it was an intermittent problem associated with the edge connector or IC sockets on A15 Record this situation for future reference If the problem recurs or if this is a recurrence then replace
192. panel Z AXIS BLANK MKRS seems to be working properly If an undetected problem exists consider replacing the sweep generator assembly A14 9000 58 Instrument Level Troubleshooting ILT 3505 Checking XA14J1 78 repeatedly press SINGLE w Not sweeping TTL high m During sweep TTL low SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Go To A14 9000 Continue ILT 3506 Checking A22J8 37 repeatedly press SINGLE m Not sweeping TTL high m During sweep TTL low VOLTMETER SYNTHESIZER MOTHERBOARD ge l RIBBON CABLE CONNECTOR MARAGA a 60 REAR OF INSTRUMENT Continue Go To ILT 3160 instrument Level Troubleshooting 59 ILT 3507 There is an open on the motherboard between XA14J1 78 and A22J8 37 Verify this with an ohmmeter Is jumpering an acceptable repair Go To A22 9000 Continue ILT 3508 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab ILT 3600 Press PRESET Check for a negative going TTL pulse at the TRIGGER OUTPUT connector on the rear panel OSCILLOSCOPE REAR PANEL TS rer om Continue Go To 1LT 3605 60 Instrument Level Troubleshooting IL T 3601 ILT 3605 Press PRESET Check for a negative going TTL pulse at A14J2 Disconnect W28 From AIWJ2 W28 TRIGGER OUTPUT Go To 414 9000 Continue Replace W28 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases
193. panel to the motherboard If no seating problem is found check the ribbon cable and replace it if damaged Otherwise go to A2 9000 An open exists between XA18J1 25 and A22J1 33 Do not attempt to repair this open Go to A22 9000 and replace the motherboard Select the first correct condition and go to the indicated paragraph OFF ON A16 381 ON oe ON A16 383 ON OFF A16 384 OFF ON OFF OFF A16 384 OFF ON ON OFF A16 384 A16 390 A dash indicates a don t care condition Has the instrument overheated is the instrument very warm to the touch ag Go To A18 9000 Continue A16 A17 A18 Troubleshocting 17 A16 382 There are several things that could cause overheating Two things to check are the air flow and environment For instance is the fan blocked Is the airflow on the sides of the instrument blocked If the instrument is in a racked system is the direction of airflow the same as other instruments in the system If these conditions do not exist take the following action 1 Check all fuses on A16 There are six small plug in fuses and two solder in fuses All the fuses are close to the bottom of the board 2 Check the fan connection to the motherboard remove the rear panel and possibly the RF deck to gain access See the disassembly instructions for more information 3 If these don t fix the problem then consider one or more of the following a Replace the fan see Disassembly and
194. partially recovered from RAM This test determines if any data might be recovered 1 Set the line power switch to STANDBY and then set it to ON and observe the 12 LEDs on the top edge of A15 2 When the 4 left most LEDs DS1 display 0010 observe and record the state of the right 8 LEDs DS2 and DS3 3 Find the state of the right 8 LEDs in the following table and go to the indicated paragraph LEDs Go To Paragraph I X1XX XXXX A15 1201 1XXX XXXX A15 1201 11XX XXXX A15 1201 All Else A15 8500 A15 1201 A15 1201 A15 CPU Troubleshooting 29 A15 1205 Perform the following Note Take great care during these procedures not to short out the battery for the battery backed up RAM pp Set the line power switch to STANDBY Disconnect the line power cord Very carefully remove the A15 assembly and place it on an ESD mat 4 Using plastic tools and taking great care not to short out the battery backed up RAM remove the EEROM U4 on A15 and install a new EEROM 5 Reinstall A15 6 Reconnect line power 7 Set the line power switch to ON 8 9 o Press PRESET SERVICE Select Mer 10 Select Were you able to save calibration constants from RAM to EEROM successfully g Go To A15 9020 Continue A15 1206 Perform the following 30 A15 CPU Troubleshooting Do all tests pass gg Continue Go To A15 1210 A15 1207 The synthesizer indicates
195. pdates slowly examine and modify if required calibration constant 554 using the following procedure Press PRESET SERVICE Select AR Adjust Menu Calib Menu Select Cal Calibration constant 554 should be set to 245 If it is not continue with the following Instrument Level Troubleshooting 31 Select M Press Select Ne ae te m The display has an intermittent fault such as going blank or unintelligible characters displayed Possible failures include the following 1 Display A21 2 Front panel processor A3 3 Cables W1 W3 W4 If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem 32 Instrument Level Troubleshooting Keyboard problems are most likely one of the following m The display takes a long time to update and UNLOCK flashes in the display Press and select 1 The following is a prioritized list Find the first one that applies 1 REF UNLOCK go to A7 9000 2 SAMPLER UNLOCK go to A6 9000 3 FRACN UNLOCK go to A4 9000 4 YO UNLOCK consider the following in the order listed a A6 go to A6 9000 b A5 go to A5 9000 c A13 go to A13 9000 d A26 go to RF 2690 5 HET UNLOCK go to RF 2490 Cosmetic fault The appearance or another superficial characteristic is questionable Replace the keyboard go to A1 9000 The keyboard has an intermittent fault Possible failures i
196. pen on the motherboard between XA11J1 50 and XA15J1 76 Verify this with an ohmmeter Is jumpering the open an acceptable repair ay Go To A22 9000 Continue A11 203 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A11 FM Driver Troubleshooting 7 A11 300 TTT rrr rar ERE e caono0oc3 A ROMO EN FRONT OF INSTRUMENT Continue Go To A11 9000 A11 301 SYNTHESIZER MOTHEREGARO EE EE ED agaeceno HOVE 0 8Yde Go To A16 9000 Continue 8 A11 FM Driver Troubleshooting A11 302 An open exists between XA11J2 44 and XA16J1 22 Verify this with an ohmmeter Is jumpering the open an acceptable repair ag Go To A22 9000 Continue Ai1 303 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A11 FM Driver Troubleshooting 9 A11 400 Are all cables removed from the synthesizer including connections to the FM input Continue Go To A11 9000 A11 401 Remove all cables and go to ILT 105 10 A11 FM Driver Troubleshooting A11 9000 Replace the All assembly Adjustrnents Required Troubleshooting Perform Foldout x Adjustments Block 1 I xLocated in front of the Special Cases tab Adjustments Successful A11 FM Driver Troubleshooting 11 dc ene SN BAA ede PAI rm emer eee Petete ome A dende e
197. pler Troubleshooting 15 E T EET WNP eet IIED eee EAN ELEN NINE BEETS en rm recorra venner INN NISC MERTEN Paes Seseent OAT Reference Troubleshooting ES E SRE A NA A7 000 Message Displayed on Synthesizer Go to Paragraph A7 ABUS Ground A7 100 A7 12V Supply A7 200 A7 10 MHz Standard Input A7 300 A7 UNLOCK Detector A7 400 A7 EXT Reference Switch A7 500 AT 5V Supply A7 9000 AT 5V Supply A7 9000 AT Open Loop VIUNE A7 9000 A7 40 MHz Output A7 9000 A7 125 kHz Output A7 9000 A7 INT Reference Switch A7 9000 A7 Reference Troubleshooting 1 A Mesa nen API tee PA EP ten Meer mmm III mm ntinue Co Go To A7 1300 A7 100 gt Loop self test 231 A7 101 1 Press PRESET SERVICE etre ee Eee AS A AIN A A eum E RIA denare sn A mr pt ron Perera ee ATA ere 2 A7 Reference Troubleshooting A7 102 FRONT OF INSTRUMENT Go To A4 1305 Continue A7 103 Go To A4 1310 Continue A7 Reference Troubleshooting 3 A7 104 Go To 44 1315 Continue A7 105 a Go To A7 1320 Continue 4 A7 Reference Troubleshooting A7 106 A7 107 Go To A7 1325 Continue A7 Reference Troubleshooting 5 A7 302 M t 10Hz il A i Continue Go To A7 304 A7 303 Go to A23 000 troubleshoot the 10 MHz reference A7 304 Replace W17 and go to the Troubleshooting
198. plifier Detector Offset Pulse Delay SYTM Adjustments Low Power SRD Bias YO Driver 10V Reference YO Gain amp Linearity YO Delay SYTM Adjustments Power Fiatness Amplifier Detector Gain 12 Special Cases Calibration data specific to your instrument is stored in the microprocessor A15 If you are exchanging assemblies be sure you know which ones are the originals The original calibration data will not apply to new assemblies To avoid having to reacquire calibration data through adjustments that can be lengthy once you have located the failed assembly ensure that you return all of the other original assemblies to the instrument The calibration data for the instrument resides in RAM and EEROM on Al5 If A15 has failed this data must be transferred to the new A15 assembly Be certain that A15 has failed before attempting to move the calibration data An error in the procedure could cause all of this information to be lost and recreating the information is a very lengthy procedure A15 9001 gives the procedure for transferring the calibration data On the HP 83651A the detector CR1 part of A30 and its bias board should be replaced as one unit The bias board resistors are factory selected They are specifically selected to compensate for thermal drift If the bias board or detector is replaced separately the instrument is likely to exhibit RF power out drift SC 240 System Failures System failures are failures that h
199. problem 36 instrument Level Troubleshooting ILT 3075 ILT 3080 ILT 3081 Either the front panel SMI A2 or the ribbon cable W10 is faulty Inspect the ribbon cable Replace the A2 assembly or W10 as required and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Using either an oscilloscope or a voltmeter check the following voltages at the rear panel SMI connector her finor Did all voltages pass ag Go To A19 9000 Continue Perform the following setup 1 Press PRESET 2 Press SWEEP TIME 10 SEC Using an oscilloscope or a voltmeter check the following voltages on the rear panel SMI connector Note that pin 12 is a sweep ramp To change the sweep ramp change the sweep time using an oscilloscope try a sweep time of approximately 100 ms Instrument Level Troubleshooting 37 Location Measurement 15 Yao Pino esovde Did all voltages pass aq Go To ILT 3085 Continue ILT 3082 Measure at the center pin at each end of the cable REAR PANEL SMI CONNECTOR W235 Continue Go To ILT 3084 38 Instrument Level Troubleshooting ILT 3083 ILT 3084 ILT 3085 ILT 3090 Replace the cable W23 that connects the rear panel SMI input to the A10 assembly and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab The problem is not isolated but the following are possible fail
200. pu em reeet mers EPEA amore oo eet meron ena rre a reer II erent marne eere EA NEN adr Pado mm bn cated eee Sean ete enets Tee Pate nurvenennenene A12 Multiplier Filter Driver Troubleshooting A12 000 Message Displayed on Synthesizer Go to Paragraph A12 10 V Supply A12 100 A12 YTM Kick Circuit A12 200 A12 Rise time Comp Circuit A12 300 A12 Output Driver A12 400 Ai2 YO Error Attenuator A12 500 A12 YTE Output Driver A12 600 A12 Delay Offset DAC A12 9000 A12 Delay Gain DAC A12 9000 A12 Droop Circuit A12 9000 A12 V GHZ Buffer A12 9000 A12 Rear Panel V GHZ A12 9000 A12 Offset DAC A12 9000 A12 Slope DAC A12 9000 A12 VCOMP Summer A12 9000 A12 V GHZ Attenuator A12 9000 A12 Track Hold Circuit A12 9000 A12 YTM Tune in LO Band A12 9000 A12 YTF Kick A12 9000 A12 YTF Delay Offset DAC A12 9000 A12 Multiplier Filter Driver Troubleshooting 1 A12 YTF Delay Gain DAC A12 YTF Offset DAC A12 YTF Slope DAC A12 YTF VCOMP Summer 2 A12 Multiplier Filter Driver Troubleshooting A12 9000 A12 9000 A12 9000 A12 9000 A12 100 SYNTHESIZER HOTHERBOARD FRONT OF INSTRUMENT Continue Go To A12 9000 A12 101 SYNTHESEZER HOTHERBOARD an opeg A 6602009000600 y FRONT OF INSTRUMENT Go To A13 9000 Continue A12 Multiplier Filter Driver Troubleshooting 3 A12 110 There is an open o
201. r for example W20 from A7J7 to A24 m All other lines are part of the motherboard m Ali fuses are shown au The rear panel line fuse is next to the switching regulator A18 a Eight fuses are located on the post regulator A16 Some of these fuses are soldered in One fuse is located on the rectifier filter A17 o One fuse is located on the switching regulator A18 This fuse has an LED located close by If the LED is on the fuse is good cl One fuse is located on the RF Interface A20 on the RF deck m Options may be shown in the upper right hand corner of the block diagram The letters at the coax cables indicate how the options fit into the RF deck a Assemblies shown in the front or rear panels are located in those panels including A2 However part of A2 is shown in the lower left hand corner of the block diagram This portion of A2 contains the front panel power switch and was positioned at this point on the block diagram for convenience m Signals are labeled with power and frequency limits if appropriate Signals not labeled are either TTL digital signals or they are too complex or unique to characterize for the purposes of the block diagram Special Cases 15 m Cables are labeled with reference designators Signals going from the RF interface A20 to the RF deck are actually ribbon cables These ribbon cables carry power supply voltages and signals required for controlling the microcircuits 16 Special Cases
202. r several minutes with the covers on to insure that an intermittent problem does not exist Go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab Follow the disassembly procedures in the Service manual to remove the rear panel and disconnect ribbon cable W31 from the motherboard Measure the resistance of the 15 Vdc supply to ground XA16J1 25 26 65 and 66 to ground A16 A17 A18 Troubleshooting 49 SYNTHESIZER HOTHERROARD FRONT OF INSTRUMENT Go To A22 9000 Go To A19 9000 A16 4500 Measure the voltage of the 5 Vdc unregulated supply from A17 to A16 at XA16J1 20 21 60 and 61 SYNTHESIZER MOTHERBOARD 7 to 13Vde Y FRONT GF INSTRUMENT Continue Go To A16 4502 50 A16 A17 A18 Troubleshooting A16 4501 A16 4502 Do the following 1 2 3 6 Set line power switch to STANDBY Disconnect the instrument from line power Wait for all the indicators in the power supply section to go out 4 Remove A16 D Connect the instrument to line power using an isolation transformer Set the line power switch to ON Measure the voltage of the 5 Vdc unregulated supply from A17 to A16 at XA16J1 20 21 60 and 61 7 to 13Vde SYNTHESIZER MOTHERBOARD TELF TEVE Boares amp FRONT OF INSTRUMENT Go To A17 9000 Continue Do the following if not already performed 1 Set line power switch to STANDBY 2 Disconnect
203. re replacing A10 check all cables especially W35 and wiring harnesses around A10 and the RF deck Note that W35 does not slip on to A24J7 it screws on If you find any problems correct them and then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab If you do not find any problems replace A10 go to A10 9000 if it has not already been replaced Otherwise replace the A24 go to RF 2490 A10 710 The problem is almost certainly A10 However before replacing A10 check all cabling and wiring harnesses around A10 and the RF deck If you find any problems correct them and then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab If you do not find any problems replace A10 go to A10 9000 if it has not already be replaced If A10 has been replaced go to A10 702 A10 705 and Special Cases for additional information 16 A10 ALC Troubleshooting A10 800 Are all cables removed from the synthesizer including any connections to EXT ALC a q Continue Go To A10 9000 A10 801 Remove all cables and go to 111 105 A10 ALC Troubleshooting 17 A10 9000 Replace the A10 assembly Adjustments Required Troubleshooting Perform Foldout Adjustments Block 1 xLocated in front of the Special Cases tab Adjustments Successful 18 A10 ALC Troubleshooting A11 101 Perform the following key seque
204. run to confirm correct operation of the synthesizer For example were self tests run after a repair as a periodic check or as part of a calibration aq Continue Done Does the synthesizer have a front panel with a display and keyboard and do you want to test the display and keyboard ag Go To ILT 110 Continue Test the display by running self test 257 1 Press SERVICE 2 Select Sel 3 Press 257 7 4 Select lo 57 To exit the test press PRESET Do marching characters and a fast moving cursor _ appear on the display ag Go To A21 9000 Continue Instrument Level Troubleshooting 5 6 ILT 109 ILT 110 Test the keyboard by running self test 21 oe we DN Turn the rotary knob on the front panel clockwise and counter clockwise Do an X and a dash flash in the upper right corner of the display a 4 Go To 1LT 6000 Continue Press all keys on the front panel except PRESET Do all dashes change to Xs Go To A1 9000 Continue If a password is set you must know it to do this step View calibration constant 463 hardware configuration 1 Press 2 Select I 3 If ENTER PASSWORD O appears on the top line of the display a Enter the password b Press ENTER C Select instrument Level Troubleshooting 5 Press ENTER 6 Note the value of calibration constant 463 Compare it to the following list HP83621A 30864 HP83631A 308
205. s Continue Go To RF 3090 Perform the following setup 1 Set the power switch to standby 2 Reconnect any disconnected cables 3 Remove the hard line which connects to the input of the bridge detector 4 Turn power on 6 Select E System Troubleshooting 13 14 System Troubleshooting 7 Press cw 8 Press 2 GHz The following sequence exercises direct control over the power level with the ALC loop open Continue with the following sequence 1 Press POWER LEVEL 2 Use the rotary knob to set the ALC over 1ts full range approximately 80 dBm to 0 dBm 3 Using the rotary knob the measured RE power should be adjustable from lt 8 to gt 0 dBm 4 Press cw 5 Press 4 increments frequency Repeat steps 1 through 5 until the CW frequency equals 50 GHz If there is an unleveled condition at a specific frequency set that CW ka and repeat steps 1 through 3 nge From lt 8dBm to gt 7dBm fap 83651A POWER METER Disconnect W59 From AJO pg Go To RF 3290 Go To RF 3090 _ eae ee SYS 650 For the HP 83621A 31A only perform the following setup 1 Set the power switch to standby 2 Reconnect any disconnected cables 3 Disconnect W45 from the amp multiplier A28 as shown in the following figure Set the line poewr switch to ON renner Select L Press ew Press 2 GHz The following sequence exercises direct control over the power level w
206. s Check the following list for possible solutions to the problem e To control the language from the front panel the language portion of the HP IB switch must be set to 7 binary 111 For instruments using SCPI set the language part of the switch to 0 binary 000 m For instruments using Analyzer language set the switch to 1 binary 001 If the instrument is used with HP 8510 systems either set the language part of the switch to 1 or set the language to Analyzer language at the front panel This also applies to systems that depend on HP 8340 8341 compatibility For instruments using CHL either set the switch to 2 binary 010 or set it to 7 binary 111 and set the language to CIIL at the front panel This language is an option a For MSIB instruments including option H10 set the switch to 3 binary 011 This cannot be set from the front panel a Concerning the address switches the HP 8510 and other systems assume that the HP IB address is 19 binary 10011 Did any of these suggestions fix the problem a Go To A19 9000 Done instrument Leve Troubleshooting 69 ILT 4000 Each function has a most likely assembly or group of assemblies responsible for an undefined fault Most of these faults are microprocessor control type faults and often point to the CPU assembly A15 The circuitry has been previously exercised by the self tests The functions listed below are primarily microprocessor manipulations of
207. s dl Go To A15 9020 Continue A15 CPU Troubleshooting 21 A15 405 Perform the following Note Take great care during these procedures not to short out the battery for the battery backed up RAM 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Very carefully remove the A15 assembly and place it on an ESD mat 4 Using plastic tools and taking great care not to short out the battery backed up RAM remove and replace the EEROM U4 on A15 with a new EEROM 5 Reinstall A15 6 Reconnect line power 7 Set the line power switch to ON 8 9 BPA AER PR TR oA RE ANT NA IA re a IN er teen aeneae a AA Fat TT ad pe ine tid s aren eae et ta r Select Adjust Menu Calib Menu Cal Util Menu za r AA AS Were you able to save calibration constants from RAM to EEROM successfully Go To A15 9020 Continue A15 406 Perform the following 1 Press pietna ERZ yore 22 A15 CPU Troubleshooting A15 407 A15 410 A15 500 Do all tests pass aq Continue Go To A15 410 The synthesizer indicates one or more self test failures Go to the paragraph shown on the synthesizer for the failure unless the message is A15 ROM tests In that case rather than the paragraph shown on the synthesizer go to A15 9020 When EEROM was lost most of the calibration data was saved by copying from battery backed up RAM However two types of data were not saved These data
208. s on there are voltages present that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service on this instrument with its protective covers removed Perform the following setup i Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Remove the front panel and reconnect W3 the ribbon cable that connects A3 to the motherboard A15 1405 Sy OF GO Replace the front panel Remove the rear panel and disconnect W31 the ribbon cable that connects the motherboard to A19 Refer to the disassembly procedures as needed Temporarily replace the rear panel leaving the ribbon cable loose Take great care to ensure the ribbon cable is not in contact with any line power wires or connections Reconnect the line power cord Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off Continue Go To A19 9000 Perform the following setup D Set the line power switch to STANDBY Disconnect the line power cord Wait for all the indicators in the power supply section to go out Reconnect W31 the ribbon cable that connects A19 to the motherboard Remove the RF deck Refer to the disassembly procedures as needed Reconnect the line power cord Repeat the p
209. se Troubleshooting 3 A9 221 A9 222 A9 223 6 A9 Pulse Troubleshooting m de LEE Fawag e GN Go To A10 9000 Continue There is an open on the motherboard between XA9J2 55 and XA10J2 25 Verify this with an ohmmeter Is jumpering an acceptable repair Go y A22 9000 g Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A9 202 There is an open on the motherboard between XA9J1 25 and XA10J1 25 Verify this with an ohmmeter Is jumpering the open an acceptable repair ag Go To A22 9000 Continue A9 203 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A9 220 Press PRESET GW th a Continue Go To A9 9000 A9 Pulse Troubleshooting 5 A9 221 TITS nosats Y Go To A10 9000 Continue pS o A9 222 There is an open on the motherboard between XA9J2 55 and XA10J2 25 Verify this with an ohmmeter Is jumpering an acceptable repair aq Go To A22 9000 Continue A9 223 Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 6 A9 Pulse Troubleshooting A9 300 Perform the following key sequence Go To A9 310 Continue AS Pulse Troubleshooting 7 A9 301 A9 302 8 AS Pulse Troubleshooting Go To A9 320 Continue Do the oe 1 Select L Soop asterisk off 2 ven W32
210. sent that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service on this instrument with its protective covers removed A15 1104 Perform the following setup 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Remove the front panel and reconnect W3 the ribbon cable that connects A3 to the motherboard 5 Replace the front panel 6 Remove the rear panel and disconnect W31 the ribbon cable that connects the motherboard to A19 Refer to the disassembly procedures as needed 7 Temporarily replace the rear panel leaving the ribbon cable loose Take great care to ensure the ribbon 26 A15 CPU Troubleshooting A15 1105 cable is not in contact with any line power wires or connections 8 Reconnect the line power cord 9 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn ag Continue Go To A19 9000 Perform the following setup 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Reconnect W31 the ribbon cable that connects A19 to the motherboard 5 Remove the RF deck Refer to the disassembly procedures as needed Reconnect the line power cord 7 Repeat the power on
211. stance of XA16J1 36 to ground VOLTNETER SYNTHESIZER MOTHERDORRE aannDaRREHWs p 19 Go To A3 9000 Go To A21 9000 Since all of the connections to the 13 6V power supply have been removed and the resistance measurement is still less than 1002 there is a short on the motherboard Go to A22 9000 replace the motherboard Do the following 1 2 3 With the line switch in the STANDBY position Set the line power switch to STANDBY Disconnect the instrument from line power and wait until all A18 indicators are off Remove A18 measure the resistance of XA18J1 25 to ground Pin 25 is accessible from the component side top of the A16 A17 A18 Troubleshooting 15 motherboard It is the pin at the left rear corner of connector XA18J1 as viewed with the instrument front panel facing towards you VOLTPETER TOP GF SYNTHESIZER NOTHERBOARD Continue Go To A18 9000 A16 361 Measure the resistance of A22J1 33 to ground with the power switch in STANDBY Note that the numbering on the A22J1 connector may be incorrect Pin 33 is the left rear corner of A22J1 SYNTHESIZER MOTHERBOARO HAteebaeedey pesado Ypa oa Continue Go To 416 365 16 A16 A17 A18 Troubleshooting A16 362 A16 365 A16 380 A16 381 Red DS6 Red DS5 Red DS4 Red DS3 GoTo CURR LIMIT OVERVOLT OVERCURR OVERTEMP Paragraph Remove the front panel and check the seating of the ribbon cables connecting the front
212. t Level Troubleshooting ILT 102 Does the synthesizer have a front panel with a display and keyboard Go To ILT 5000 Continue ILT 103 Enable factory preset 1 Press SYSTEM 2 Select P P 3 Press PRESET Could you complete the factory preset ap Go To ILT 6500 Continue ILT 104 Press PRESET Start MHz Stop MHz Power dBm 10 000000 20000 000000 INT Compare the synthesizer display to the figure shown Stop and start frequencies may vary depending on the synthesizer model number Also flashing messages may appear on the front panel These messages include but are not limited to OVEN UNLOCK LOW UNLVLED and OVRMOD Do not consider these messages failures at this time instrument Level Troubleshooting 3 Is the display correct ag Go To ILT 6506 Continue ILT 105 Ensure that all external cables are removed from the synthesizer and then perform a full self test 1 Press 2 S el ect pe AAN 3 Wait about 1 minute for self tests to run Continue with paragraph ILT 106 IL T 106 kk ALL SELF TESTS HAVE PASSED ox No failures were found in any of the tests on the self test list Uptions Loop Log Cont Abort At the end of self test if the display shows ALL SELF TESTS HAVE PASSED continue with ILT 107 Otherwise follow the directions displayed on the synthesizer 4 instrument Level Troubleshooting ILT 107 ILT 108 Were the self tests
213. t the line power cord Set the line power switch to ON Measure the previously failed voltage Continue Go To A16 7030 Set the line power switch to STANDBY 2 Disconnect the instrument from ac line power Wait for all the indicators in the power supply section to go out Reinstall the front panel A16 A17 A18 Troubleshooting 89 Warning gt When the instrument is connected to ac line power or the A18 high voltage neon indicator is on there are voltages present that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service on this instrument with its protective covers removed An isolation transformer must be used during all these procedures Observe all safety practices Remove all jewelry metal that can short to ground 5 Remove the rear panel Refer to the disassembly and replacement procedures as required 6 Disconnect W31 the ribbon cable connecting the rear panel interface A19 to the motherboard A22 7 Reinstall the rear panel with the ribbon cable still disconnected 8 Reconnect the instrument to ac line power 9 Set the line power switch to ON 10 Measure the previously failed voltage Continue Go To A19 9000 A16 7007 1 Set the line power switch to STANDBY 2 Disconnect the instrument from ac line power 3 Wait for all the indicators in the power supply section to go out 4 Remove the rear panel
214. ted just prior to the Special Cases tab 12 A5 YO Loop Troubleshooting A5 8500 A5 8501 Are all five switch positions on ASSI open Continue Go To A5 9000 Open all five switch positions on A5S1 and rerun self tests If the same failure occurs as the original failure go to A5 9000 and replace A5 If the same failure does not occur go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A5 YO Loop Troubleshooting 13 A5 9000 Replace the A5 assembly Adjustments Required Troubleshooting Perform Foldout x Adjustments Block 1 located in front of the Special Cases tab Adjustments N Successful 14 AS YO Loop Troubleshooting o A6 Sampler Troubleshooting A6 000 Message Displayed on Synthesizer Go to Paragraph A6 ABUS Ground A6 100 A6 UNLOCK Detector A6 200 A6 Phase Amplifier A6 300 A6 IF Output Level A6 400 A6 VTUNE Endpoints A6 500 A6 Loop Integrator A6 9000 A6 Loop Gain DAC A 6 9000 A6 PAL Check A6 9000 A6 IF Amplifier Bias A6 9000 A6 Speed up Circuit A6 9000 A6 VTUNE Monotonicity A6 9000 A6 Switching Speed A6 9000 A6 Sampler Troubleshooting 1 A6 100 2 Select 3 Press 4 Select 5 Select Go To A6 110 A6 101 Select eee od Select El Perform the following key sequence 1 Press PRESET E SYNTHESIZER ACTHERBOARD FRONT OF INSTRUME
215. tep 5 Remove the RF deck Refer to the disassembly procedures as needed Reconnect line power Set the line power switch to ON Press PRESET Select Press ENTER ds E my svar 1 ane A15 CPU Troubleshooting 19 A15 320 20 A15 CPU Troubleshooting Go To A15 8500 Go To A20 9000 One of the following assemblies is defective m A4 fractional n m A5 YO loop m A7 reference m AQ pulse w A10 ALC w All FM driver mw A12 SYTM driver w A13 YO driver m Al4 sweep generator Replace any one of the assemblies and perform the following test 1 Press 2 Select NIT ara DE dy mu SSA iene 3 Press ENTER devas SERVICE pg Beren Rise DOS r shoes NT anes If the test fails the assembly just replaced is defective If the test does not fail replace another assembly and repeat test number 233 When the defective assembly is identified go to the 9000 paragraph for that assembly for replacement instructions For example for A4 go to A4 9000 for A5 go to A5 9000 and so on A15 400 A15 401 Perform the following Set the line power switch to ON 1 2 3 4 5 salen EE on g 6 Press PRIOR Aare aire EEROM tests Er all other pass fails Did all EEROM tests pass a Continue Go To A15 8500 Perform the following 1 Set the line power switch to ON 2 Press Did all RAM test
216. ter FL2 can occur A16 A17 A18 Troubleshooting 59 Measure the resistance of the 5 Vdc supply to ground XA16J1 13 14 39 40 53 54 79 and 80 to ground SYNTHESIZER MOTHERSCARO FRONT OF INSTRUMENT Continue Go To A16 4610 A16 4604 Refer to the disassembly procedures and remove the RF deck Measure the resistance of the 5 Vdc supply to ground XA16J1 13 14 39 40 53 54 79 and 80 to ground SYNTHESIZER MOTHERBOARD FRONT OF INSTRUMENT Go To A16 4630 Continue 60 A16 A17 A18 Troubleshooting A16 4605 Reinstall the RF deck in the service position Refer to the disassembly procedures Remove the ribbon cables that connect the microcircuits to the RF deck Measure the resistance of the 5 Vdc supply to ground XA16J1 13 14 39 40 53 54 79 and 80 to ground SYNTHESIZER MOTHERBOARD gt 750 FRONT OF INSTRUMENT Go To A20 9000 Continue A16 4606 Reconnect the microcircuit ribbon cables one at a time while measuring the resistance of the 5 Vdc supply to ground XA16J1 13 14 39 40 53 54 79 and 80 to ground Finally check the 5V fuse on A16 and replace it if open Did a microcircuit cause a resistance measurement of lt 750 ay Go To A16 4608 Continue A16 A17 A18 Troubleshooting 61 A16 4607 Go to the paragraph indicated to replace the faulty microcircuit Microcircuit Go To Paragraph A29 amp filter A28 amp multiplier A26 YO A24 low band A31 a
217. the line power traces on the motherboard damaged ap Continue Go To A16 209 Inspect A17 and A18 Check for signs of physical damage On the A18 assembly look closely at the large resistors underneath and adjacent to the large heat sinks on A18 Check the fuses on A17 and A18 one each If they are open replace them Do A17 and A18 appear damaged Continue Go To A16 210 A16 A17 A18 Troubleshooting 9 A16 206 H the problem was open fuses on either A17 or A18 it is unlikely that replacing the fuses will solve the problem completely Typically open fuses are an indication of other failures However you may want to replace the fuses and restart troubleshooting at A16 000 Otherwise do the following Replace the following 1 AC voltage selection switch wiring harness 2 FLI line module filtered 3 Fuse and fuse holder 4 Other line related hardware that shows any amount of damage Inspect and replace if damaged the following 1 A17 rectifier filter 2 A18 switching regulator 3 A16 post regulator 4 A22 motherboard inspect A22 closely before replacing See the disassembly instructions and replaceable parts information as necessary Restart troubleshooting at A16 0000 A16 207 Replace the following m FLi line module filtered m AC voltage selection switch wiring harness a Fuse and fuse holder m Any other damaged or discolored parts or assemblies m Replace the motherboard if damaged
218. the RF interface assembly Replace W41 or A20 and then go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 18 A12 Multiplier Filter Driver Troubleshooting A12 9000 Replace the A12 assembly Adjustments Required Troubleshooting Perform Foldout Adjustments Block 1 xLocated in front of the Special Cases tab Adjustments Successful A12 Multiplier Filter Driver Troubleshooting 19 eeeeees cee ements MAA mm Pt remos is tie III e BEES man yang popa A13 YO Driver Troubleshooting A 13 000 Message Displayed on Synthesizer Go to Paragraph A13 10V Reference A13 100 A13 YO Kick Circuit A13 200 A13 Width DAC U3B A 13 300 A13 Delay OFFST DAC U10A A13 400 A13 YO Loop Error A 13 500 A13 Driver Amplifier A13 600 A13 YO V GHz Buffer A13 9000 A13 CW DAC U3B A13 9000 A13 Sweep Attenuator A13 9000 A13 SWP Vern DAC U16A A13 9000 A13 OFF Vern DAC U16B A13 9000 A13 Delay GAIN DAC U10B A13 9000 A13 Narrow Wide Switch A13 9000 A13 YO Driver Troubleshooting 1 A13 100 Perform self test 182 1 Remove the A10 A12 and A14 assemblies 2 Press SERVICE MP 3 enu 4 Press ENTER 5 toon 6 Artene AILS Continue Go To A13 120 A13 101 Perform the following key sequence fruer 2 A13 YO Driver Troubleshooting Continue Go To A13 9000 A13 102
219. the appropriate adjustments and performance tests Replace the amp doubler A32 using the disassembly and replacement procedures in the Service manual Perform the appropriate adjustments and restart troubleshooting Replace the Am modulator A38 using the disassembly and replacement procedures in the Service manual Perform the appropriate adjustments and restart troubleshooting Replace the directional coupler A39 using the disassembly and replacement procedures in the Service manual Perform the appropriate adjustments and restart troubleshooting A41 is the most likely failure However there is a small chance that the problem is with the switching voltage on the DC feed on A41 At 1 9 GHz the voltage should be lt 4 V at 2 GHz the foltage should be gt 4 V Replace the diode switch A41 using the disassembly and replacement procedures in the Service manual Perform the appropriate adjustments and restart troubleshooting RF Troubleshooting 15 errmsmermeenee seoses o S FE s r mn see de eme e rem rre Perro erre vever an Pe EEN tetee EEE ENN rms des Seaton eneste System Troubleshooting TS EEE EEE AG EEE SG EP AA SYS 000 Message Displayed on Synthesizer Go to Paragraph SYS YO Loop Locking SYS 100 SYS LBAND Modulators SYS 200 SYS LBAND Leveling SYS 300 SYS HBAND Leveling SYS 500 SYS YTM Tracking HP 83651A SYS 600 N SYS YTM Tracking
220. the cause Go to A13 9000 to replace A13 Does the adjustment modulator offset and gain fail above 2 GHz Go To ILT 2115 Continue Does the adjustment modulator offset and 2 fail below 2 GHz ay Go To ILT 2120 Continue The problem is most likely the A10 assembly it is possible however that A24 and A38 are both faulty First go to paragraph A10 9000 If this does not fix the problem consider RF 2490 and or RF 3890 Instrument Level Troubieshooting 17 ILT 2115 ILT 2120 ILT 2130 ILT 2240 The problem is most likely either the A24 or the RF cables connected to A24 It is possible however that the A10 assembly may be the problem If A24 has not been replaced go to RF 2490 otherwise go to A10 9000 The problem is most likely either A38 or the RF cables connected to A38 It is possible however that the A10 assembly may be the problem If A38 has not been replaced go to RF 3890 otherwise go to A10 9000 The most likely cause of this problem is the A10 assembly If this assembly has not been replaced go to A10 9000 If this assembly has been replaced consider changing the AM modulator RF 3890 Or if the problem exists only in low band try changing low band RF 2490 The most common problem with RF power is loose or damaged connectors and coax cables especially hard lines on the RF deck If the instrument has sudden drops in power above 10 GHz check for faulty connections Check all
221. the following 1 Set the line power switch to STANDBY 2 Replace the A14 assembly Go to A15 8500 Perform the following setup 1 Set the line power switch to STANDBY 2 Remove the All and A12 assemblies 3 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off aq Continue Go To A15 1335 Perform the following 1 Set the line power switch to STANDBY 2 Replace the All and A12 assemblies Go to A15 8500 Perform the following setup 1 Set the line power switch to STANDBY 2 Replace the A11 assembly 3 Repeat the power on sequence and observe the indicators on A15 A15 1340 A15 1341 A15 1345 Did all the indicators turn on temporarily and then turn off ay Go To A11 9000 Go To A12 9000 Perform the following setup 1 Set the line power switch to STANDBY 2 Remove the A9 and A10 assemblies 3 Repeat the power on sequence and observe the indicators on A15 Did all the indicators turn on temporarily and then turn off Continue Go To A15 1345 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A9 and A10 assemblies Go to A15 8500 Perform the following setup 1 Set the line power switch to STANDBY 2 Replace the A9 assembly 3 Repeat the power on sequence and observe the indicators on A15 A15 CPU Troubleshooting 35 A15 1350 A15 1351 A15 1355 36 A15 CP
222. the following setup A15 211 8 A15 CPU Troubleshooting Set the line power switch to STANDBY Disconnect the line power cord Wait for all the indicators in the power supply section to go out Remove the rear panel and disconnect W31 the tibbon cable that connects the motherboard to A19 Refer to the disassembly procedures as needed Temporarily replace the rear panel leaving the ribbon cable loose Take great care to ensure that the ribbon cable is not in contact with any line power wires or connections Reconnect the line power cord Set the line power switch to ON Press SERVICE AN e Paaa nt ner Px oS ie a om oe me ES Aa Continue Go To A19 9000 Perform the following setup 1 Set the line power switch to STANDBY 2 Disconnect the line power cord 3 Wait for all the indicators in the power supply section to go out 4 Reconnect W31 the ribbon cable that connects A19 to the motherboard Go to A15 8500 A15 220 Perform the following 1 Set the line power switch to STANDBY 2 Remove the A14 assembly Set the line power switch to ON Press SERVICE 3 4 5 6 f Select 1 p Continue Go To A14 9000 A15 221 Perform the following 1 Set the line power switch to STANDBY 2 Replace the A14 assembly Go to A15 8500 A15 230 Perform the following 1 Set the line power switch to STANDBY 2 Remove the All and A12 assemblies 3 Set line pow
223. the instrument from line power 3 Wait for all the indicators in the power supply section to go out 4 Remove A16 A16 A17 A18 Troubleshooting 51 Measure the resistance of the 5 Vdc supply to ground XA16J1 18 19 58 and 59 to ground SYRTHESIZER NOTHEREOARD acogee OPH Sooceaeetaenag ROE eee y i A 2 750 FRONT OF INSTRUMENT Continue Go To A16 4520 A16 4503 Remove the following assemblies mw Ad fractional N m A5 YO phase detector m reference a A9 pulse m All FM driver e A12 SYTM driver A13 YO driver m Al4 sweep generator m A15 microprocessor z A6 sampler Note Be sure to disconnect the rigid cable connected to the og input of A6 before removing A6 Otherwise damage to the cable A6 and possibly the filter FL2 can occur mg 2777 52 A16 A17 A18 Troubleshooting Measure the resistance of the 5 Vdc supply to ground XA16J1 18 19 58 and 59 to ground SYNTHESIZER NOTHERROARO FRONT OF INSTRUMENT Continue Go To A16 4510 A16 4504 Refer to the disassembly procedures to remove the RF deck Measure the resistance of the 5 Vdc supply to ground XA16J1 18 19 58 and 59 to ground SYNTHESIZER NOTHERSORRD a j le 500028 a gnasTLABAHEOGN Oa gt 750 FRONT OF INSTRUMENT Go To A16 4530 Continue A16 A17 A18 Troubleshooting 53 A16 4505 Refer to the disassembly procedures and reinstall the RF d
224. the previously tested hardware Also use the block diagram located at the end of Special Cases for further assistance w Power level functions o RF on off does not function properly go to ILT 3052 oO Power sweep does not function go to A15 9000 possibly A14 9000 o Unable to set power slope go to A15 9000 c Unable to uncouple the attenuator go to A15 9000 or A20 9000 cr Unable to set up down power size go to A15 9000 B Setting frequencies start stop CW etc mo Unable to set up down size go to A15 9000 o Unable to set frequency offset go to A15 9000 c Unable to set frequency multiplier go to A15 9000 z Unable to control marker functions go to A15 9000 possibly A14 9000 m Sweep function control o List function does not work properly go to A15 9000 o Unable to control one of the following m Step size go to A15 9000 m Step points go to A15 9000 mw Step dwell go to A15 9000 m Step sweep trigger go to A15 9000 o Sweep ramp functions improperly go to A14 9000 u Frequency list does not work properly o For frequency changes greater than 500 MHz if unleveled or unlock indicators appear try the amp multiplier adjustments 70 Instrument Level Troubleshooting ra For all other cases A15 is the most likely cause of failure Go to A15 9000 to replace A15 Fast sweep time problems lt 100 ms sweep time Do the YO or amp multiplier adjustments see the Service manual a Slow sweep time pro
225. ting 5 A6 200 L200UNt OCK A6 201 Perform the following key sequence PRESET CERVICE Press Select Selftest I Press 67 ENTER Select asterisk on Select Ha GC DS ke ot PES The signal should be dominated by a TTL low Some TTL highs may be present failure is defined as a signal with no TTL lows OSCTLLOSCOPE FRONT OF INSTRUMENT Go To A6 9000 Continue The signal should be dominated by a TTL low Some TTL highs may be present A failure is defined as a signal with no TTL lows 6 A6 Sampler Troubleshooting A6 202 A6 203 SYNTHESIZER NOTHERBOARD L200UNLOCK FRONT OF INSTRUMENT Continue Go To A15 9000 There is an open on the motherboard between XA6J1 50 and XA15J1 38 Verify this with an ohmmeter Is jumpering the open an acceptable repair ay Go To 422 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab A6 Sampler Troubleshooting 7 A6 300 Set up the oscilloscope for 500 input impedance OSCILLOSCOPE Disconnect W15 From Continue Go To A6 9000 A6 301 d v to 1 0 Disconnect W15 From A6J1 El Go To A7 9000 Continue A6 302 Replace W15 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 8 A6 Sampler Troubleshooting N A6 400 Set up for power measurement Set the pow
226. to ac line power using an isolation transformer Do not turn the instrument on Listen and watch The instrument should remain inactive Disconnect the ac line power cord Inspect the line fuse it should be undamaged Does the instrument remain Inactive and is the line fuse undamaged aq Go To A16 200 Continue 2 A16 A17 A18 Troubleshooting A16 101 A16 102 Inspect A17 and A18 for signs of physical damage On the A18 assembly look closely at the large resistors underneath and adjacent to the large heat sinks on A18 Check the fuses on A17 and A18 one each If they are open replace them Then using the following table go to the indicated paragraph Either Either A17 or Go To Fuse Open A18 Damaged Paragraph A16 321 A16 321 A16 206 A16 102 Continue with the following setup 1 With ac line power disconnected install A17 and A18 2 Connect the instrument to ac line power using an isolation transformer Do not turn the instrument on 3 Observe the indicators on A18 and the amber standby light on the front panel of the instrument Compare their status to the following list m Amber standby light front panel ON m A18 neon high voltage indicator DS2 ON m A18 green 13 6V LED DS1 ON A18 amber preregulator shutdown LED DS7 ON a All other A18 LEDs OFF Were all indicators correct and does the instrument still appear safe to operate Go To A16 300 Continue A16 A17 A1
227. tor A38 where it is used to control the loop gain And finally the level corrected signal out of the AM modulator A38 is frequency multiplied and filtered A28 in the HP 83621A 31A and amplified and filtered A29 and amplified and doubled A32 in the HP 836514 14 Special Cases Notice that the reference signal for level control in both ALC loops is created by the sweep generator A14 This is specifically the LEVEL REF TO A10 exiting the sweep generator While it is not shown on the block diagram it does connect directly to the ALC A10 If this level reference is lost the ALC loop will not be controllable The block diagram is intended to relate both physical and electrical information The following items will help you interpret the block diagram PC assemblies shown with tabs are located in the open card cage or in the in the covered power supply cage A17 A18 located at the left rear corner of the instrument m The 22V transformer shown next to the switching regulator A18 is located between the covered power supply section and the rear panel Dangerous voltages exist in this area m All components located on the RF deck are located inside the heavy border labeled RF DECK m Semi rigid coax cables are shown with a double line and are labeled with a reference designator for example W50 from A25 to A24 on the RF deck m Flexible coax cables are shown with a single line and are labeled with a reference designato
228. trument Level Troubleshooting ILT 2660 ILT 2670 level during a measurement Pay attention to the bands in which the problem appears Use the table below to help isolate the problem Failing Data Points lt 2 GHz only Low band microcircuit A24 gt 20 0 GHz Doubler amp A32 All Other Cases YO A26 amp multiplier A28 AM modulator A38 and amp detector A29 Most Likely Causes After taking action go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab The most likely cause is the YO driver assembly go to A13 9000 the next possibility is YO assembly go to RF 2690 After taking action go to the troubleshooting foldout block 1 located just prior to the Special Cases tab The most likely faults are listed below 1 a 3 The most likely fault is the measurement setup Check the setup Check the calibration constants listed in the Service manual Pay special attention to the following calibration constants a Lock dwell time b Max phase lock wait If an unlock message appears press I The following is a prioritized list Find the first one that applies a REF UNLOCK go to A7 9000 b SAMPLER UNLOCK go to A6 9000 instrument Level Troubleshooting 27 c FRACN UNLOCK go to A4 9000 d YO UNLOCK consider the following in the order listed i A6 go to A6 9000 ii AS go to A5 9000 iii A13 go to A13 9000 iv A2
229. tt Packard for instructions or assistance Run the diagnostics and solve any additional problems as required Recreate all the calibration data use the performance tests and adjustments AIG A17 A18 Power Supply Troubleshooting Warning Y A16 000 When the instrument is connected to ac line power or the A18 high voltage neon indicator is on there are voltages present that can cause personal injury or death Only trained qualified personnel who are aware of the hazards involved should perform service on this instrument with its protective covers removed An isolation transformer must be used during all these procedures Observe all safety practices Remove all jewelry metal that can short to ground Troubleshooting power supplies is dangerous Be extra cautious Perform a complete visual inspection of the instrument and resolve any safety issues as required Continue to A16 100 A16 A17 A18 Troubleshooting 1 A16 100 Do the following we Ge DO ork ar 8 9 10 Set the line power switch to STANDBY Disconnect the ac line power cord Remove the instrument s top cover Wait for all the indicators in the power supply section to go out Completely remove the following assemblies m Al6 post regulator u A17 rectifier and filter a A18 switching regulator Inspect the line fuse on the rear of the instrument Replace it if necessary Connect the instrument
230. ttenuator A32 amp doubler A33 amp switch A16 4608 You may have removed the defect in the disassembly process or the problem may be intermittent Also check the 5V fuse on A16 Replace it if defective Go to Troubleshooting Foldout block 1 located just prior to the Special Cases tab A16 4610 Reinstall the previously removed assemblies one at a time while measuring the resistance of the 5 Vde supply to ground XA16J1 13 14 39 40 53 54 79 and 80 to ground Replace the assembly that causes a resistance measurement of lt 750 If no assembly causes a low resistance measurement you may have removed the defect in the disassembly process or the problem may be intermittent Also check the 5V fuse on A16 Replace it if defective Go to Troubleshooting Foldout block 1 located just prior to the Special Cases tab 62 A16 A17 A18 Troubleshooting A16 4620 A16 4621 Check the 5V fuse on Al6 Is the fuse defective gg Go To A16 7000 Continue Do the following 1 Replace the defective fuse 2 Install A16 3 Connect the instrument to line power using an isolation transformer 4 Set the line power switch to ON Is the green 5V LED on Go To A16 7000 Continue Replacing the fuse seems to have fixed the problem but this simple solution is suspect You may want to monitor the instrument for several minutes with the covers on to insure that an intermittent problem does not exist Go to the
231. uld be on or blinking Does XA14J2 36 properly control the front panel SWEEP indicator aq Go To A14 9000 Continue ILT 3406 Identify A22J8 35 Alternately short to ground and open A22J8 35 Observe the SWEEP OUTPUT at the rear panel with a voltmeter if the instrument has a front panel with a display and keyboard observe the SWEEP indicator on the front panel When the pin is shorted to ground the SWEEP OUTPUT should stop sweeping and the front panel SWEEP indicator should be off when the pin is not shorted to ground the output should a sweep and the indicator should be on or blinking 56 Instrument Level Troubleshooting Does A22J8 35 properly control the front panel SWEEP indicator Continue Go To A19 9000 ILT 3407 There is an open on the motherboard between XA14J2 36 an A22J8 35 Verify this with an ohmmeter Is jumpering an acceptable repair aa Go To A22 9000 Continue Install a jumper and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab instrument Level Troubleshooting 57 ILT 3500 Perform the following setup Press PRESET Press SWEEP TIME GED ENGD A Press GHz Cs Press GHz Checking the Z AXIS BLANK MKRS on the rear panel repeatedly press SINGLE a While not sweeping TTL high b During sweep TTL low Cr de Go ho REAR PANEL E BLANK MKRS DIGITAL VOLTMETER Go To ILT 3505 Continue ILT 3501 The rear
232. ument from line power 3 Wait for all the indicators in the power supply section to go out Remove A16 Connect the instrument to line power using an isolation transformer 6 Set the line power switch to ON Qi a A16 A17 A18 Troubleshooting 43 Measure the 15 Vdc unregulated supply from A17 to A16 at XA16J1 27 28 67 and 68 SYNTHESIZER HOTHEREOARD FRONT OF INSTRUMENT Go To A17 9000 Continue A16 4402 Do the following if not already performed 1 Set line power switch to STANDBY 2 Disconnect the instrument from line power 3 Wait for all the indicators in the power supply section to go out 4 Remove A16 44 A16 A17 A18 Troubleshooting Measure the resistance of the 15 Vdc supply to ground XA16J1 25 26 65 and 66 to ground SYNTHESIZER HOTHERAORRO SSS caoena Q9 JOPPE TET AE Mn 2750 FRONT OF INSTRUMENT Continue Go To A16 4420 A16 4403 Remove the following assemblies w A4 fractional N m A5 YO phase detector m A7 reference u AQ pulse a Ali FM driver m A12 SYTM driver s A13 YO driver a Al4 sweep generator m A15 microprocessor m A6 sampler A EEE Note i Be sure to disconnect the rigid cable connected to the 53 input of A6 before removing A6 Otherwise damage to the cable A6 and possibly the filter FL2 can occur e a rea a e an ee A16 A17 A18 Troubleshooting 45 Measure the resistance of the 15 Vdc supply to ground XA16J1 25
233. ures m The rear panel SMI A19 is fauity m W31 is faulty connects A19 to the motherboard m The ALC assembly A10 is faulty This is true if leveling is the problem m The source module used with the synthesizer is faulty To confirm this try to use the front panel SMI or substitute either a new source module or synthesizer a A remote possibility exists that the motherboard A22 is faulty If these alternatives do not fix the problem use the instrument block diagram located at the end of Special Cases to troubleshoot this problem Either the rear panel SMI A19 or the ribbon cable W23 is faulty Inspect the ribbon cable Replace the A19 assembly or W23 and go to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab HP IB problems involve a ribbon cable and one of three assemblies The assemblies are listed below from most to least likely to fail First run the HP IB port self test that follows If this self test fails the CPU assembly A15 is the most likely failure If this test passes change the assemblies in the order listed 1 Ensure that nothing is connected to the HP IB connector 2 Press SERVICE Instrument Level Troubleshooting 39 3 Select 4 Press 9 Select Most likely failures 1 An excessive length of HP IB cable The specification for length of HP IB cable is no more than 2 meters per instrument and a maximum of 20 meters
234. w Band Detector Output gt 045 amp Go e A10 9000 RF Troubleshooting 11 RF 803 Measure the DC voltage at 100 MHz 500 MHz 1 GHz and 1 9 GHz DIGITAL VOLTNETER Go To RF 2490 Continue RF 804 Replace W24 and to to the Troubleshooting Foldout block 1 located just prior to the Special Cases tab 12 RF Troubleshooting Microcircuit _ Assembly Replacement RF 2490 RF 2491 RF 2690 RF 2691 The low band assembly A24 is the most likely failure There is a small chance that A20 has failed Has the low band assembly A24 been replaced ag Continue Go To A20 9000 Replace the low band assembly A24 using the disassembly and replacement procedures in the Service manual Then perform the appropriate adjustments and performance tests and restart troubleshooting The YO A26 is the most likely failure However there is a small chance that the failure is A20 Has the YO A26 been replaced Continue Go To A20 9000 Replace the YO A26 using the disassembly and replacement procedures in the Service manual Then perform the appropriate adjustments and performance tests and restart troubleshooting RF Troubleshooting 13 r e tree A e IIA AIN Wee EEE mmm eredes CNN eee II ene aseeseen sne tenseme meme F Ta RF 3090 RF 3290 RF 3890 RF 3990 RF 4190 The A30 bridge detector has failed Replace it and perform
235. wer switch to ON A16 A17 A18 Troubleshooting 91 92 A16 7030 A16 7031 bh pt or Remeasure the voltage If the voltage now fails this assembly is faulty Go to RF xx90 where xx is the assembly number For example if the assembly is A29 then go to RF 2990 Repeat this procedure until the problem has been isolated or until no more microcircuits exist If no more microcircuits exist go to Special Cases Set the line power switch to STANDBY Disconnect the instrument from ac line power Reconnect only W2 the ribbon cable connecting the source module interface assembly A2 to the motherboard A22 Reconnect the instrument to ac line power Set the line power switch to ON Measure the previously failed voltage gt Go To A2 9000 Continue bo pl Set the line power switch to STANDBY Disconnect the instrument from ac line power Reconnect W3 the ribbon cable connecting the front panel processor A3 to the motherboard A22 Disconnect the ribbon cables connecting the front panel processor A3 to the display A21 and the keyboard A1 Reconnect the the instrument to ac line power Set the line power switch to ON A16 A17 A18 Troubleshooting A16 7032 A16 7033 T Measure the previously failed voltage Go To A3 9090 Continue Mo p D Ot gt Set the line power switch to STANDBY Disconnect the instrument from ac line power
236. wn off Go ub A16 4100 gt Are all green LEDs on the A16 assembly on aq Go To A16 000 Continue Do the following 1 Set line power switch to STANDBY 2 Disconnect the instrument from line power 3 Wait for all the indicators in the power supply section to go out 4 Remove A15 5 Reconnect the instrument to line power using an isolation transformer 6 Set the line power switch to ON Is the red A16 PRA LED post regulator alert on gr Go To A15 9000 Continue 32 A16 A17 A18 Troubleshooting A16 4003 A16 4004 Do the following 7 Set line power switch to STANDBY Disconnect the instrument from line power Wait for all the indicators in the power supply section to go out Install A15 Remove the front panel and disconnect ribbon cable W3 from the motherboard Reconnect the instrument to line power using an isolation transformer Set the line power switch to ON Is the red A16 PRA LED still on ag Go To A3 9000 Continue Do the following 1 Set line power switch to STANDBY Ze 3 Disconnect the instrument from line power Wait for all the indicators in the power supply section to go out Remove A16 A16 A17 A18 Troubleshooting 33 Measure the resistance from XA16J1 78 to ground _ VOLYNETER SYNTHESIZER NOTHERBORAD we San nn GAGO E 408 Ba E Go To A22 9000 Go To A16 4900 A16 4100 With the line power switch set to O

Agilent Technologies 83621A User's Manual

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