for normal levels of background and trace illumination. 3. Observe
Contents
1. HEWLETT PACKARD L Troubleshooting Tip Random HV Fuse Blowing in 1740A 1742A and 1743A 100 MHz Oscilloscopes Doug Moloney Hewlett Packard Over the past few years there have been some cases of random fuse blowing in the high voltage power supplies of the 1740A 1742A and 1743A 100 MHz Oscilloscopes And when the fuse is replaced no ap parent problem seems to exist Also because of the random nature of the problem and the difficulty of prov ing whether the transformer is at fault many HV transformers have been replaced when they were not the cause Obviously there is a problem It s just hard to track down Actually there are several causes and no one cause seems to be predominant So if you have a scope with a blown HV fuse and if when you replace the fuse it does not blow immedi ately after power up follow this procedure l Replace the fuse with a DC am meter capable of 1 to 1 5 amps 2 Turn the scope on and set both BEAM INTENSITY and SCALE for normal levels of background and trace illumination 3 Observe the HV oscillator cur rent Normal current is approxi mately 650 mA to 800 mA Excessive current is gt 900 mA 4 If current is excessive start checking the following compo nents in the following order Part No 5952 0112 SERVICE INFORMATION FROM HEWLETT PACKARD NOVEMBER DECEMBER 1982 Check For Component A15C1 Leakage or open do not just disconnect to c2. 64203A 7 64203A 8085 Emulator Subsystem Emulator Pod serial prefix numbers 2241 and above Parts list for user cable with active assembly 64213A 1 64213A 6802 Emulator Subsystem Emulator Pod serial prefix numbers 2252 and above Parts list for user cable with active assembly 64215A 1 64215A 6809 Emulator Subsystem Emulator Pod serial prefix numbers 2250 and above Parts list for user cable with active assembly 64262A 3 64262A 8048 Emulator Subsystem Emulator Pod serial prefix numbers 2240 and above Parts list for user cable with active assembly 645XX PROM PROGRAMMER 64500S 2 64500S Positive PROM programmer Se rial prefix 1924A ID code failure 64502A 2 64502A programmer module Verify failure 64621A STATE ANALYSIS CONTROL BOARD 64621A 1 Serial prefix 2144A 12VDC in Clock Preprocessor Control cable 85650A QUASI PEAK ADAPTER 85650A 3 All serials Correct AC mains fuses NOVEMBER DECEMBER 1982 BENCH BRIEFS 11 WWW HPARCHIVE COM a i s If you want service notes please check the appropriate boxes below and return this form separately to one of the following addresses Hewlett Packard 1820 Embarcadero Road Palo Alto California 94303 For European customers ONLY Hewlett Packard Central Mailing Dept P O Box 529 Van Hueven Goedhartlaan 121 AMSTELVEEN 1134 Netherlands O 3779B 25 o 5180A 9 O 3779B 26 o 5335A 15 o 3779C 5 O 5342A 37 o 3779D 5 O
3. Level Meas Set Switch Controller Data Line Analyzer Data Line Analyzer Channel Selecter Pri Multiplex Analyzer Pri Multiplex Analyzer Jitter Generator Receiver LF Impedance Analyzer Power Meter Signature Multimeter Thermal Printer ASCII Interface 5300B HP IB Interface Module Universal Cntr Universal Cntr Opts 011 020 021 030 031 040 041 Universal Cntr Opt H99 Universal Cntr Opt 096 H42 Universal Cntr Opts 011 020 021 030 031 040 041 Universal Cntr military Universal Cntr Frequency Frequency Cntr Opt 011 Cntr Opt 011 Cntr Opt 011 Cntr Opts 002 Microwave Microwave 011 Microwave Microwave 011 Cntr Opt 011 Cntr Opts 004 Microwave Source Synchro Electronic Cntr Opt 011 program in program in program in program in program in program in program in 03785 10004 04192 90501 00436 10006 00436 10007 59300 10002 59300 10001 59300 10001 59300 10002 59300 10002 59300 10001 59300 10001 59300 10001 59300 10002 59300 10002 59300 10001 59300 10002 59300 10001 59300 10001 59300 10001 59300 10002 59300 10001 59300 10002 59300 10002 59300 10001 WWW HPARCHIVE COM manual manual manual manual manual manual manual 85A 9825B 9830A 9825A 85A 98254 98254A 854 85A 98254A 98254 98254A 85A 85A 98254A 854 98254 98254 98254 854A 98254
4. tion to enhance analog circuitry 3456A 17 All serials 3456A Service Kit 03456 69800 replaced by Service Kit 44056A 3476A B DIGITAL MULTIMETER 3476A 2A All serials General service information regarding replacement parts for 3476A 3476B 6 All serials General service information regarding replacement parts for 3476B 3555B TRANSMISSION AND NOISE MEASURING SET 3555B 5 Serials 0992A03536 and below Improved power supply 3586A B C SELECTIVE LEVEL METER 3586A B C 9 Field replacement kits for the A50 Step Loop and A51 Summation Loop assemblies 3586A B C 10 All serials Announcement of service spare parts kit for HP model 3586A B C Selective Level Meter 3711A IF BB TRANSMITTER 3711 2 All serials Part number change for IF Attenuator 3712A IF BB RECEIVER 3712 5 All serials 15V rail fuse blowing intermittently 3712 6 All serials Part number change for IF Attenuator 3730B DOWN CONVERTER 3730B 2 All serials Part number change for OPT 010 IF Attenuator 3770B TELEPHONE LINE ANALYZER 3770B 26 All serials Preferred replacement of power supply switching transistors HP part number 1854 0665 3779A B C PRIMARY MULTIPLEX ANALYZER 3779A 23 All serials Service accessories for per formance tests 3779A 24 All serials Preferred replacement of ROMs on A23 3779B 25 All serials Service accessories for per formance tests 3779B 26 All serials Preferred replacement of ROMs on A23 3779C 5 All s
5. 5342A 38 O 3785A 2 O 5342A 39 O 3785B 2 O 5343A 14 O 3964A 19 O 5343A 15 O 3968A 21 O 5343A 16 O 4935A 7 O 5343A 17 O 4935A 8 O 53448 1 O 4940A 16 O 5451C 06 O 5005B 1 O 5451C 07 O 5046A 2 O 6034A 5 S O 5180A 1 O 8447C 1 oO 5180A 2 O 8557A 4 o 5180A 3 o 8557A 5 O 5180A 4 O 8558B 16A O 5180A 5 O 8558B 23 O 5180A 6 O 8558B 24 o 5180A 7 oO 8559A 11 Name Service Note Order Form Firm Address City State DEO bo opaca Qca o000 oO Please photocopy this order form if you do not want to cut off the page ET LR TS Ba PAL NS LT EN SE LOT TRE FS SE TONE DELS FLEE POLIS ONES ESE SAI Te RITE I a TE TRE SE 140T 1C S oO 3336A B C 4A O 340B 342A 5 O 3336A B C 5A S O 346B 3 O 3336A B C 9 O 400E EL 2B O 3437A 8 O 400E EL 13 O 3455A 20A O 400F FL 7 oO 3456A 1B O 400GL 3 O 3456A 14 O 652A 6 O 3456A 17 o 1310B 2 O 3476A 2A oO 1311B 6 O 3476B 6 o 1317B 2 o 3555B 5 O 1321B 2 O 3586A B C 9 o 1340A 5 O 3586A B C 10 o 1351A 1 O 3711 2 o 1351S 1A o 3712 5 O 1645A 8 O 3712 6 O 1805A 2 oO 3730B 2 o 3060A 51 oO 3770B 26 o 3325A 11A S O 3779A 23 O 3325A 12 oO 3779A 24 HEWLETT PACKARD COMPANY 1820 Embarcadero Road Palo Alto California 94303 BENCH BRIEFS NOV DEC 1982 Volume 22 Number 5 Service information from Hewlett Packard Company To obtain a qualification form for a free subscription send your request to the above address Reader comments or technical article contributions are wel
6. attention to proper probe selection Since all probes inherently create some error the objective is to select a probe that reduces the error to an acceptable or known level Proper probe selection increases the confidence you can place in oscilloscope measurements True part of your confidence comes from knowing your scope but the right probe determines whether or not the full accuracy potential of your oscilloscope is realized If you would like a copy of this catalog contact your local HP Sales and Service office Soe aS Ee i pT Pe OR 5 RE a SE ZS OT AEE EEN E IE TS BE eg BAT NES ES SH RRS SE ee Se More on Printed Circuit Board Rework Repair and Cleaning If you found the article on rework ing and cleaning printed circuit boards interesting there is more HP has produced three video tapes that go into more detail and show many more good optical microscope and SEM photographs such as the one below If you are interested in learning more on printed circuit board reli ability contact your nearest HP sales or service office about the fol lowing video tapes Printed Circuit Board Reliability 36 min HP part 90660R Printed Circuit Board Contact Re liability 25 min HP part 90661R Analysis of Multilayer Ceramic Ca pacitors 27 min HP part 90662R den drite den drit n 1 Geol a a branch ing figure or marking resembling moss or a shrub or tree in form found on or in certain
7. stones or minerals due to the presence of a foreign material b any arborescent crystalline growth 2 Anat the branching process of a neuron which conducts impulses toward the cell See diag under neuron This particular form of dendrite was caused by excessive use of circuit cooler during troubleshooting The board surface was se verely disturbed due to the radical temper ature change This created a fissure providing the gold a route to grow follow ing the path of least resistance between the different potentials of the adjacent traces The result is a resistive short between the two traces NOVEMBER DECEMBER 1982 BENCH BRIEFS 3 WWW HPARCHIVE COM Many Hewlett Packard instruments with HP IB capability have calculator controlled programs available that can save you considerable time in verifying instrument operation Most programs are documented with instructions listing flowchart check points etc For more information on the programs listed below contact your local HP office 3042A 3045A 3047A 3050B 3052A 3054A 33354 3437A 3455A 3495A 35824A 3585A 37201A 372034 3745A 3745B 3747A 3747B HP IB Verification Programs MODEL Network Analyzer Spectrum Analyzer Spectrum Analyzer with 35601A Interface Voltmeter System Voltmeter System Voltmeter System Frequency Synthesizer System DVM System DVM Scanner Spectrum Analyzer Spectrum Analyzer HP IB Extender HP I
8. ulator circuit on A25 rear panel assembly 5180A 4 Serials 2224A00310 and below Modification to prevent possible noise problems associated with the TRIG OUT circuit on the A25 rear panel assembly 5180A 5 Serials 2210A00211 and below Modification to A8 and A9 high speed memory assemblies to correct bad data points 5180A 6 Serials 2220A00300 and below Input amplifier static protection and frequency bandwidth modifications 5180A 7 All serials AC line protections mains fuse change 5180A 9 All serials ROM EPROM replacement strategy 5335A UNIVERSAL COUNTER 5335A 15 Serials 2224 and below Modification to improve the performance of the X10 Attenuator Circuitry in Option 040 5342A MICROWAVE FREQUENCY COUNTER 5342A 37 Serials 2104A04095 and below Replace ment for A10U6 Divide by N Assemblies 5342A 38 Serials 2244A06615 and below A18 Time Base Buffer and A21 Power Supply Assembly compatibility 5342A 39 Serials 2228A and below Resistors required when changing A10U2 Divide by N Assemblies 5343A MICROWAVE FREQUENCY COUNTER 5343A 14 Serials 2104A00335 and below Replace ment for A10U6 Divide by N Assemblies 5343A 15 Serials 2204A and below ROM change corrects miscounts and limit errors in manual mode 5343A 16 Serials 2228A and below Resistors required when changing A10U2 Divide by N Assemblies 5343A 17 Serials 2232A00845 and below A18 Time Base Buffer and A21 Power Supply Assembly compatibil
9. 8 All serials Resistors incorrectly loaded on 10388A interface 10 BENCH BRIEFS NOVEMBER DECEMBER 1982 WWW HPARCHIVE COM 1805A DUAL CHANNEL VERTICAL AMPLIFIER 1805A 2 Serials 1409A and below Preferred re placement for A9T1 3060A CIRCUIT TEST SYSTEM 3060A 51 All serials New Volume 1C CCD Manual 3325A SYNTHESIZER FUNCTION GENERATOR 3325A 11A S Serials 1748A00101_ through 1748A06800 Notification of potential safety hazard 3325A 12 Serials 1748A 05825 and below Proce dure for installing Rev E power supply 3336A B C SYNTHESIZER LEVEL GENERATOR 3336A B C 4A 3336A serials prior to 1930A00409 3336B serials prior to 1931A00396 3336C serials prior to 1932A00276 Procedure for replacing 3336A B C Rev A Rev B Rev C or Rev D power supplies A2 PC board with the 3336A B C Rev E power supply 3336A B C 5A S 3336A serials 1930A00409 through 1930A00530 3336B serials 1931A00396 through 1931A00570 3336C serials 1932A00276 through 1932A00340 Trace spacing discrepancy in Revi sion D power supply 220V 240V applications 3336A B C 9 Spare Parts Service Kit 3437A SYSTEMS VOLTMETER 3437A 8 All serials Parts recommendation for on site repair 3455A DIGITAL VOLTMETER 3455A 20A All serials 3455A Service Kit 03455 69801 replaced by Service Kit 44055C 3456A DIGITAL VOLTMETER 3456A 1B All serials 3456A Service Kit 03456 69801 replaced by Service Kit 44056B 3456A 14 Serials 2201A06299 and below Modifica
10. 854A 85A 98254 3746A 3755A 3771A 3771B 3777A 3779A 3779B Manual 3785A B Manual Manual Manual Manual Manual Manual Manual 04192 90100 Op 436A Manual 436A 2 Serv Note Note 5005B Manual 5050A 4 Serv Note 5312A 2 Serv Note 5312A 4A Serv Note 5316A 3A Serv Note 5328A 17 Serv Note 5328A H99 Manual 5328A H42 Manual 5328A 33B Serv Note 5328A 34B Serv Note 5335A Manual 5335A 7B Serv Note 5340A 11 Serv Note 5341A Manual 5342A Manual 5342A 32A Serv Note 5343A Manual 5343A 11A Serv Note 5344S Manual 5345A 9A Serv Note NOVEMBER DECEMBER 1982 BENCH BRIEFS 5 5345A 5345A 5345A 5353A 5354A 53554 5358A 5359A 5363A 5363B 5370A 5420A B 5423A 59301A 59303A 59304A 59306A 59307A 59308A 59309A 59313A 59500A 6034A 69321B 6940B 6941B 6942A 69xxx 7220 Electronic Cntr Opt 012 Electronic Cntr Opt 911 Electronic Cntr Opt 012 Channel C Plug In 4 GHz Frequency Cntr Automatic Frequency Cnvtr Measurement Stor Time Synthesizer Time Interval Probes Time Interval Probes Univ Time Intv Cntr Digital Signal Analyzer Structural Dynamics Ana ASCII Parallel Cnvtr Digital to Analog Cnvtr Numeric Display Relay Actuator VHF Switch Timing Generator Digital Clock Analog to Digital Cnvtr Multiprogmr Interface Power Supply D A Voltage Converter Multiprogmr Multiprogmr Extndr Multiprogmr Multiprogmr Plug
11. B Extender Sel Level Meas Set Sel Level Meas Set Sel Level Meas Set Sel Level Meas Set 4 BENCH BRIEFS NOVEMBER DECEMBER 1982 TAPE PART NO 03042 90211 03045 10001 35601 10001 35601 10011 03050 90230 03050 90212 03052 90011 03052 10002 03052 10004 03052 10008 03054 10002 03054 10005 03335 10001 03437 10001 03455 10001 03455 10002 03495 10001 03495 10002 03582 10001 03585 10001 37201 18100 37203 12101 03745 18003 03745 18003 03745 18003 03745 18003 9825A 98254A 9845B 9836A 98254 98304A 98254A 98354A 9835B 9845B 98354A 9845B 98254 98254 98304A 98254A 98304A 98254A 98254A 98254 98254 9825A 98254 98254A 98254 98254A WWW HPARCHIVE COM PROGRAM DOCUMENTATION 3042A Manual 3045A Manual 35601A Manual 35601A Manual 3050B Manual 3050B Manual 3052A Manual 3052A Manual 3052A Manual 3052A Manual 3054A Manual 3054A Manual 3335A Manual 3052A Manual 3052A Manual 3052A Manual 3495A Manual 3495A Manual 3582 Manual 3585 Manual 37201A Manual 37203A Manual 3745A B 52 Serv Note 3745A B 52 Serv Note 3747A B 23 Serv Note 3747A B 23 Serv Note gt 3746A 3755A 37714 3771B 3777A 3779A 3779B 3785A B 4192A 436A 5005B 5150A 5312A 5312A 5316A 5328A 5328A 5328A 5328A 5328A 5335A 5340A 5341A 5342A 5342A 5343A 5343A 53445 5345A Sel
12. In Cds Graphics Plotter 6 BENCH BRIEFS NOVEMBER DECEMBER 1982 Plug in 59300 10001 59300 10002 59300 10002 59300 10001 59300 10001 59300 10001 59300 10001 59300 10001 59300 10001 59300 10001 59300 10001 05420 69002 05420 69002 59300 10001 59300 10001 59300 10001 59300 10001 59300 10001 59300 10001 59300 10001 59300 10001 14551 13001 06034 10002 14551 13001 14551 13001 14551 13001 14710 13001 14551 13001 07220 18001 5010 2585 98254 854 854A 98254A 98254A 98254 98254 98254A 98254 98254 98254A 9825A B 9825A B 9825A 9825A 9825A 98254 98254 98254 98254 98254 98254 85A 9825A 98254 98254 98254 98254A 98254 854A order from CPC 5957 3862 854A order from SDD WWW HPARCHIVE COM 5345A 12A Serv Note 5345A 19A Serv Note 5345A 20A Serv Note 5353A 1 Serv Note 5354A 6 Serv Note 5355A Manual 5358A Manual 5359A Manual 5363A 2 Serv Note 5363B Manual 5370A 1A Serv Note Supplied Supplied with tape with tape 59301 2 Serv Note 59303A 1 59304A 1 59306A 4 593074 3 59308A 1 59309A 3 Serv Note Serv Note Note Note Serv Serv Note Note Serv Serv 59313A Manual Supplied with tape 06034 10002 Kit Manual Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied with tape with tape with
13. MHz oscillation 400E EL AC VOLTMETER 400E EL 2B All serials Recommended replacement parts 400E EL 13 400E serials 1208A 29593 and below 400EL serials 2214A 28523 and below Option H99 instruments only Improved Option H99 Line indicator light operation 400F FL AC VOLTMETER 400F FL 7 400F serials 0950A 14305 and below 400FL serials 2213A 14250 and below Option H99 instruments only Improved Option H99 Line indicator light operation 400GL AC VOLTMETER 400GL 3 400GL serials 0943A 03870 and below Option H99 instruments only Improved Option H99 Line indicator light operation 652A TEST OSCILLATOR 652A 6 All serials Replacement procedure for the range switch S1 1310B GRAPHICS GENERATOR SYSTEM 1310B 2 All serials Explanation of Blue Stripe Board Exchange Program 1311B GRAPHICS GENERATOR SYSTEM 1311B 6 All serials Explanation of Blue Stripe Board Exchange Program 1317B GRAPHICS GENERATOR SYSTEM 1317B 2 All serials Explanation of Blue Stripe Board Exchange Program 1321B GRAPHICS GENERATOR SYSTEM 1321B 2 All serials Blue Stripe Board Exchange Program 1340A X Y DISPLAY 1340A 5 Serials 2038 and below Modification to im prove LVPS performance 1351A S GRAPHICS GENERATOR SYSTEM 1351A T All serials Explanation of Blue Stripe Board Exchange Program 1351S GRAPHICS GENERATOR SYSTEM 1351S 1A All serials Explanation of Blue Stripe Board Exchange Program 1645A DATA ERROR ANALYZER 1645A
14. anges Includes compre hensive chart of waveguide specifications If you would like a copy of this cat alog contact your local HP Sales and Service office 2 BENCH BRIEFS NOVEMBER DECEMBER 1982 WWW HPARCHIVE COM Oscilloscope Accessories Probing In Perspective HP Part No 5952 1892 For many years oscilloscopes have been the chief test and analysis in struments used by electronic engi neers and technicians In recent years new techniques and compo nents have extended oscilloscope measurement capabilities to many new applications However the os cilloscope is a useful measurement instrument only if the test signal can be accurately coupled to the amplifiers In many applications the voltage probe is the only practical method to pick off and apply the signal With the increased band widths in today s scopes one probe cannot be used for all measure ments This application note pro vides an approach that will allow you to select the best probe for most commonly encountered oscilloscope measurement situations Major areas covered are e How to select the most accurate scope probe for a particular mea surement e How to quickly evaluate a given scope probe for its adequacy in a particular measurement situation e How to quickly estimate errors caused by the probe Almost any probe scope combination can be used to view a waveform However making accurate measurements requires careful
15. brary of operating and service manuals is also available on mi crofiche These two libraries and updating subscription service are available from Hewlett Packard un der the following part numbers Library Manuals only 5951 6505 Subscription Manuals only 5081 5812 Library Service Notes only 5951 6511 Subscription Service Notes only 5951 6517 Library Manuals amp Notes 5951 6523 Subscription Manuals amp Notes 5951 6529 Please contact your nearest HP Sales or Service office for prices and ordering details N a U Hi u i IK _s Need Any Service Notes They re free Here s the latest listing of Service Notes They recommend modifica tions to Hewlett Packard instru ments to increase reliability improve performance or extend their usefulness Use the order form at the rear of Bench Briefs to select the notes that relate to your instruments 140T OSCILLOSCOPE 140T 1C S Serials 2002A and below Modification to reduce possibility of electrical shock during failure conditions 340BR AND 342AR NOISE FIGURE METERS 340B 342A 5 340BR serials 1940A03366 to 2038A03431 342AR serials 1930A03371 to 2038A03644 Modification to prevent the diode cur rent adjustment potentiometer R20 from shorting to the instrument bottom cover on rack mount ver sions only 346B NOISE SOURCE 346B 3 Serials 2037A01401 to 2037A01457 Modifi cation to prevent a spurious 300
16. comed Please send them to the Bench Briefs Editor Editor Jim Bechtold Hewlett Packard 690 E Middlefield Rd Mt View CA 94042 Zip 8559A 12 8559A 13 8565A 16A 8566A 18 8569A 7 8672A 10A 8683A 1 8970A 1 8970A 2 64000 0D 64100A 13 64110A 2 64110A 3 64110A 4 64110A 5 64155A 1 64202 3B 64203A 7 64213A 1 64215A 1 3 S3AUP SOTOLHIG9 Oole OF AIG idfs LSNI All rights reserved Permission to reprint Bench Briefs granted upon written request to the Editor 12 BENCH BRIEFS NOVEMBER DECEMBER 1982 WWW HPARCHIVE COM O 64262A 3 oO 64500A 2 O 64502A 2 O 64612A 1 o 85650A 3 Bulk Rate U S Postage PAID Sunnyvale CA Permit No 317 Printed in U S A
17. ed Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied with with with with with with with with with with with with with with with with with with with with with with with with with with 8409B 11863D 8409C 11863F 8409C 11863E tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape tape Manual Manual Manual NOVEMBER DECEMBER 1982 BENCH BRIEFS 7 WWW HPARCHIVE COM 8501A Storage Normalizer Contact HP for tape 8501A Manual 8507A Network Analyzer 85030 10002 9830A 8507A Manual 8507B Network Analyzer 85030 10007 9825A 8507B Manual 8507C Network Analyzer 85030 10013 9845B 8507C Manual 8566A Spectrum Analyzer 08566 60002 9825B 8566A Manual 08566 90005 9825B Manual only 8568A Spectrum Analyzer 08568 60002 9825B 8568A Manual 08568 90028 9825B Manual only 8620C Sweeper Mainframe Contact HP for tape Supplied with tape 86210 Sweeper Plug in Contact HP for tape Supplied with tape 86220 Sweeper Plug in Contact HP for tape Supplied with tape 86222 Sweeper Plug in Contact HP for tape Supplied with tape 86230 Sweeper Plug in Contact HP for tape Supplied with tape 86235 Sweeper Plug in Contact HP for tape Supplied with tape 86241 Sweeper Plug in Contact HP for tape Supplied with tape 86242 Sweeper Plug in Contact HP for tape Sup
18. erials Service accessories for perfor mance tests 3779D 5 All serials Service accessories for perfor mance tests 3785A B JITTER GENERATOR AND RECEIVER 3785A 2 Serials 2226U 00210 and below Improve ment in synthesizer buffer loading 3785B 2 Serials 2216U 00130 and below Improve ment in synthesizer buffer loading 3964A INSTRUMENTATION TAPE RECORDER 3964A 19 All serials Mislabeled FM data PCAs 3968A INSTRUMENTATION TAPE RECORDER 3968A 21 All serials Mislabeled FM data PCAs 4935A TRANSMISSION IMPAIRMENT MEASURING SET 4935A 7 Serials 2208A and lower Modification required to make new transformer backward compatible 4935A 8 Serials 2208 and below Modification to im prove reliability of output level control 4940A TRANSMISSION IMPAIRMENT MEASURING SET 4940A 16 Serials 1401A and below New prefix 2240A with 0837 0252 Power supply improve ment and mini repair 5005B SIGNATURE MULTIMETER 5005B 1 Serials listed in text Function select error when returning to remote 5046A DIGITAL IC TEST SYSTEM 5046A 2 All serials List of IC text programs which have been revised 5180A WAVEFORM RECORDER 5180A 1 All serials Improved adjustment procedures for XYZ display circuit 5180A 2 Serials 2210A00220 and below Modifica tions to Z OUT 15V regulator and TRIG OUT circuits on the A25 rear panel assembly 5180A 3 Serials 2044A00200 and below Modification to prevent possible oscillation of the 15V reg
19. heck for leakage be cause no capacitor or open has the same ef fect as leakage A15CR1 Improper junction ca pacitance easiest way to check is by substitut ing another diode HP part no 1901 0028 HV Partial conduction of DISABLE A15Q1 disconnect col CIRCUIT lector of A15Q1 If cur rent is now normal troubleshoot HV dis able circuit WWW HPARCHIVE COM Ql osc Low Beta easiest way to check is substitution A15T1 Corona discharge from windings to core may not be visible when cold but usually becomes visable after approxi mately one hour with covers on In most cases the problem will be found by this process and with a high level of confidence in the cor rective action If you did not observe excessive cur rent the problem is either inter mittent or temperature related and monitoring the current for a longer period with the covers on will prob ably do the trick Hewlett Packard 1982 Application Notes from HP Microwave Literature WAVEGUIDE MEASUREMENT ACCESSORIES CATALOG Coaxial amp Waveguide Measurement Acces sorles Catalog HP Part No 5952 8262 Building a microwave measurement system from individual components seems simple enough Most scalar measurement techniques for atten uation or SWR are very straightfor ward and well described in the literature So it would seem all you have to do is assemble the parts and start measuring But like a chain a mea
20. ity 5344S MICROWAVE SOURCE SYNCHRONIZER 5344S 1 Serials listed in text Board change corrects remote command being ignored after local lockout 5451C FOURIER ANALYZER SYSTEM 5451C 06 All serials 54440A Filter adjustment procedure 5451C 07 All serials 54420A DAC adjustment procedure 6034A POWER SUPPLY 6034A 5 S Serials 2141A 00592 and below Re versed AC and neutral ACC at power module 8447C SERIES AMPLIFIERS 8447C 1 Serials 1937A and below Modification kit for replacement amplifier 8557A SPECTRUM ANALYZER 3557A 4 Serials 2106A and below Modification Kit HP Part Number 00853 60057 for HP 8557A com patibility with HP 853A Spectrum Analyzer Display 8557A 5 Serials 2106A and below Improved Log Amplifier Assembly 8558B SPECTRUM ANALYZER 8558B 16A All serials Changing standard 8558B into 75 ohm Option 001 or 002 8558B 23 Serials 2145A and below Modification Kit HP Part Number 00853 60058 for HP 8558B com patibility with HP 853A Spectrum Analyzer Display 8558B 24 Serials 2142A and below Improved Log Amplifier Assembly 8559A SPECTRUM ANALYZER 8559A 11 Serials 2208A and below Modification Kit HP Part Number 08553 60059 for HP 8559A com patibility with HP 853A Spectrum Analyzer Display 8559A 12 Serial prefix 2208A and below Anti crush Drive Hub and Reference Level knob 8559A 13 Serials 2208A and below Improved Log Amplifier Assembly 8565A SPECTRUM ANALYZER 8565A 16A All serial
21. lines The spacing between circuit board traces on the power supply assembly does not comply with IEC 348 requirements Refer to the following serial numbers to see if your instrument requires cor rective action 3336A 1930A00409 through 1930A00530 3336B 1931A00396 through 1931A00570 3336C 1932A00276 through 1932A00340 If your generator falls into the above group use the order form at the rear of Bench Briefs and order Safety Service Note 3336A B C 5A 2 which will tell you to return your unit to the nearest HP Service Center for repair 6034A System Power Supply The AC and NEUTRAL wires are reversed at the rear panel power module on units with serial num bers 2141A00592 and below As a result the line fuse is located in the NEUTRAL side of the power line This wire reversal does not affect the operation of the unit and under normal conditions will not be haz ardous to the operator However if an internal AC short to chassis ground occurs and the external ground path has been broken the chassis would be at AC potential with no fuse To correct the problem exchange the AC and NEUTRAL wires at the AC power module inside the rear panel For detailed instructions order Safety Service Note 6034A 5 S with the order form at the rear of Bench Briefs What Are Service Notes For one thing they are free For another they provide an after sales support link to Hewlett Packard for a continuous flow of
22. of these important notes they are printed on paper with a red border and the service note number has a S suffix In order to make you immediately aware of any potential safety prob lems we are highlighting safety related service notes here with a brief description of each problem Also in order to draw your atten tion to safety related service notes on the service note order form at the back of Bench Briefs each appro priate number is highlighted by being printed in color 3325A Synthesizer Function Generator A shock hazard may exist on all ex posed BNC connector shells on gen erators with serials 1748A00101 through 1748A06800 A trace on the underside of the A2 PC board 03325 66502 could pass less than 0 5mm from the edge of the instru ment subchassis This trace carries one half the line voltage in 220 or 240 volt AC applications For 100 or 120 volt AC lines this is a neu tral trace All 3325As in use in 220 or 240 volt AC applications must be re turned to the closest HP Service Center for the proper corrective ac tion Users operating 3325As from 100 or 120 volt AC lines have two options 1 return the unit to HP for service or 2 order the Safety Service Note 3325A 11A S with the order form at the rear of Bench Briefs and perform the steps de scribed in the note 3336A B C Synthesizer Level Generator A potential shock hazard may exist in units operated from 220 or 240 volt AC
23. plied with tape 86245 Sweeper Plug in Contact HP for tape Supplied with tape 86250 Sweeper Plug in Contact HP for tape Supplied with tape 86260 Sweeper Plug in Contact HP for tape Supplied with tape 86290 Sweeper Plug in Contact HP for tape Supplied with tape 86320 Sweeper Plug in Contact HP for tape Supplied with tape 86330 Sweeper Plug in Contact HP for tape Supplied with tape 86331 Sweeper Plug in Contact HP for tape Supplied with tape 86341 Sweeper Plug in Contact HP for tape Supplied with tape 86342 Sweeper Plug in Contact HP for tape Supplied with tape 86350 Sweeper Plug in Contact HP for tape Supplied with tape 86351 Sweeper Plug in Contact HP for tape Supplied with tape 86352 Sweeper Plug in Contact HP for tape Supplied with tape 8660A C Synthesized Sig Gen 08660 10001 9825A 8660A 29 Serv Note 8662A Synthesized Sig Gen 08662 60310 9825A 08662 60057 Op Note 8672A Synthesized Sig Gen 11712 10001 9830A 11712 90001 Kit Manual 11712 10002 9825A 11712 90001 Kit Manual 9872 Graphics Plotter 09872 18001 98254 Supplied with tape 09872 18002 98354 Supplied with tape 09872 18003 9845B 5010 2585 85A Supplied with tape order from CPC 5957 3862 85A Supplied with tape 8 BENCH BRIEFS NOVEMBER DECEMBER 1982 order from SDD WWW HPARCHIVE COM Safety Related Service Notes Service Notes from HP relating to personal safety and possible equip ment damage are of vital impor tance to our customers To make you more aware
24. s Log Amplifier adjustment 8566A SPECTRUM ANALYZER 8566A 18 Serials 2139A and below Modifications to A13 HP IB interface 8569A SPECTRUM ANALYZER 8569A 7 Serials 2113A00220 and below Suppres sion of 70 kHz sidebands 8672A SYNTHESIZED SIGNAL GENERATOR 8672A 10A All serials Option 008 Retrofit for greater power output 8683A SIGNAL GENERATOR 8683A 1 Serials 2208A and below Improvement of pulse overshoot 8970A NOISE FIGURE METER 8970A 1 Serials 2116A and below Improvement of power measurement by eliminating oscillation 8970A 2 All serials Recommended modification upon A8Q1 replacement 64000 LOGIC DEVELOPMENT SYSTEM 64000 0D Service note index 64100A LOGIC DEVELOPMENT STATION 64100A 13 All serials Washing with harsh soaps or solvents will cause the water base paint to be removed 64110A LOGIC DEVELOPMENT SYSTEM MAINFRAME 64110A 2 All serials Incorrect power supply failure LED indications 64110A 3 All serials Low line trip adjustment 64110A 4 Serials 2225A 00293 and before Over power shutdown 64110A 5 All serials Washing with harsh soaps or solvents will cause the water base paint to be removed 64155A 1 64155A wide address memory controller board numbers 64155 66501 Modification to allow addressing of 2 megabytes of emulation memory 642XX EMULATOR SUBSYSTEM 64202 3B 64202A 8080 Emulator Subsystem Emulator Pod with repair numbers 2013A00420 and below User wait state failures
25. service related information about your instrument What Do Service Notes Say e Service Notes recommend modifi cations to instruments to increase reliability improve performance or extend their usefulness Service Notes are used to inform you of a revised adjustment pro cedure recommended parts re placements and new trou bleshooting procedures e Safety Service Notes communi cate potentially hazardous condi tions related to the use of instruments NOVEMBER DECEMBER 1982 BENCH BRIEFS 9 WWW HPARCHIVE COM What Are The Benefits To Me You can create a history file on each HP instrument you own Service Notes describe modifications to in struments out in the field and are the only way you have of keeping your operating and service manual up to date How Do I Obtain Service Notes Inside Bench Briefs is an abstract of all the current Service Notes issued over the last 2 3 months At the rear of Bench Briefs is a Service Note order form 1 Look in the abstract list for the model number of your instrument 2 Read the abstract to get an idea of what the note is about 3 If you want the note or notes many times there is more than one check the appropriate numbers on the order form and mail it to one of the listed addresses Are Back Issues Available Yes A library of all service notes ever issued for most HP measure ment and test instruments is avail able on microfiche In addition a li
26. suring sys tem is only as strong as its weakest link You need components de signed for measurement results no electrical or physical incompatibili ties no surprises That s why HP offers a broad line of measurement components designed for just that results HP has introduced many microwave measurement advances both in hardware and in techniques This catalog brings together that tech nical and product information needed for making microwave sca lar measurements with confidence Detailed information is presented on e Microwave Measuring Tech niques Applications informa tion on scalar reflection and transmission measurements fre quency power and noise figure measurements Includes tabular comparisons of accuracy and rel ative costs of various techniques Also includes a list of pertinent HP Application Notes e Equipment Selection Tables Band by band listings of hard ware model numbers required for reflection and insertion loss measurements in coax and wave guide e Associated Instruments Other electronic equipment commonly used in microwave measuring setups signal generators syn thesizers sweepers spectrum analyzers network analyzers power meters and counters e Coaxial and Waveguide Instru mentation Tables A listing of product model numbers by func tion vs frequency range for coax and waveguide e Connectors Information on coaxial connectors and wave guide fl
27. tape in classroom with tape with tape with tape with tape 7221 7225 T225 7225 7245 7310 7470 7580 7585 8160A 8409B 8409C 8409D Graphics Plotter Graphics Plotter 17600 Module Graphics Plotter 17601 Module Graphics Plotter 17603 Module Plotter Printer Graphics Printer Graphics Plotter Drafting Plotter Drafting Plotter with with with Programmable Pulse Gen Network Analyzer Network Analyzer Network Analyzer 07221 18010 264x 5010 2585 85A order from CPC 5957 3862 85A order from SDD 07225 18002 9825A 07225 18003 9815 5010 2585 85A order from CPC 5957 3862 85A order from SDD 09872 18001 9825A 09872 18002 9835A 09872 18003 9845B 5010 2585 85A order from CPC 5957 3862 85A order from SDD 07220 18001 9825A 5010 2585 85A order from CPC 5957 3862 85A order from SDD 07245 18001 9825A 07245 18002 9835 45 07310 18001 2647 07310 18002 9835 5010 2585 85A order from CPC 5957 3862 854A order from SDD 5010 2585 85A order from CPC 5957 3862 85A order from SDD 5010 2585 85A order from CPC 5957 3862 85A order from SDD 08160 39910 9825A 11863 10004 9835 45 11863 10006 9845B 11863 10005 9826B Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied Supplied Suppli
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