service information from hewlett-packard
Contents
1. and return this form separately to Hewlett Packard Firm one of the following addresses Nederland BV Addresa Central Mailing Dept Hewlett Packard P O Box 529 City 1820 Embarcadero Road 1180 AM Amstelveen ji Palo Alto California 94303 The Netherlands tate IP O 2250 29A O 3577A 10 O 3782B 0A 4951C 3 6033A 4A O 8656B 6 o 8902A 1 O 70900A 08 O 3047A 1 o 3577A 11 oO 3785A 0A o 5061A 11C O 6033A 5 O 8656B 7 O 8902A 2 O 70900A 09 oO 3065 18A oO 3577A 12 o 3785A 20 5180T U 1 O 6038A L 2A o 8660A 32 O 8903B 1 oO 70900A 10 O 3065 45 o 3580A 13 O 3785B 0A O 5335A 21 O 6038A L 3 o 8660C 13 8903B 2 70900A 11 O 3065 46 O 3582A 14 O 3785B 18 O 5345A 38 6214B 2 S O 8673B 4 O 8903E 1 O 70900A 12 O 3065 48 O 3585A 12 O 3789B 1 O 5350A 6 O 6942A 15 O 8673B 5 O 8903E 2 o 70900A 14 O 3065 49 oO 3746A 0A oO 3793B 0A O 5350B 2 O 6944A 2 98633A 1 O 8673B 6 o 10761A 1A o 71000A 1 O 3314A 2 3764A 14A O 3852A 0B O 5351A 6 O 8112A 3 O 8673B 7A O 16291A 1 o 71000A 2 o 3325A 21 oO 3764A 19A O 4062B 3 O 5351B 2 o 8116A 5 oO 8673C 5 o 44701A 3 oO 86601A 10 3325A 22 oO 3764A 20 O 4063A 1 O 5352A 5 O 8160A 12 oO 8673C 6 o 44701A 4 oO 86601A 11 O 3453A 6 O 3764A 21 oO 4063A 2 O 5352B 2 oO 8160A 13 O 8673C 8 O 44702A B 6 O 86602B 5 O 3455A 25 O 3776A 0A O 4141B 1 O 5359A 7 oO 8161A 7 o 8673D 5 O 44721A 1 O 86602B 6 O 3457A 2B O 3776A 31 oO 4145B 1 O 5370A 11A O 8161A 8 O 8673D 6 o 44727A B C 12. Standard and Option 700 Models 6033A 5 Serials 2548A02221 and below Modification to improve opto isolator reliability 2ND QUARTER HP 6038A L SYSTEM DC POWER SUPPLY 6038A L 2A 6038A serials 2705A02786 and higher 6038L serials 2703A00879 and higher Discrete fault indicator FLT and remote inhibit INH en hancement for Standard and Option 700 Models 6038A L 3 6038A serials 2603A02365 and below 6038L serials 2547A00798 and below Modification to improve opto isolator reliability HP 6214B DC POWER SUPPLY 6214B 2 S Serials 2629A11237 and 2629A11245 Possible shock hazard HP 6942A MULTIPROGRAMMER 6942A 15 Serials 2622A07164 and below Modification to prevent intermittent self test failures HP 6944A MULTIPROGRAMMER HP 98633A MULTIPROGRAMMER INTERFACE CARD FOR HP 6944A 6944A 2 98633A 1 Serials 2412A00101 thru 2412A00805 Modification to prevent transmission errors when several multiprogrammers are linked together HP 8112A PULSE GENERATOR 8112A 3 Serials 2522G04131 and above Output amplifier heatsink uses metric hardware HP 8116A PULSE FUNCTION GENERATOR 8116A 5 Serials 2520G05071 and above and 2708A03818 and above Output amplifier heatsink uses metric hardware HP 8160A PROGRAMMABLE PULSE GENERATOR 8160A 12 Serials 2650G00736 and above New mi croprocessor board to improve performance 8160A 13 Serials 2650G00736 and above Option 700 MATE compatibility now installed HP 8161A PROGRAMMABLE PULSE G
3. istration For further information please contact Danny Shewey at 408 257 7000 ext 3623 HP 8566 67 68 Spectrum Analyzer Signal Analysis Division at Rohnert Park CA is offering an HP 8566 67 68 Spectrum Analyzer service training seminar in October The 10 day course 2 850 ea provides stu dents with the fundamentals of spec trum analysis as well as the technical skills required to maintain trouble shoot and repair the respective hard ware The class is configured as 50 percent lecture and 50 percent lab so that the student is provided an inte grated practical learning experience The class is sch duled to be held October 19 through October 30 1987 For more information or registration please contact Sue Goss at 707 794 3587 Reference Course Number NEN4 856XX Self Paced Service Training Packages are Available Hewlett Packard Customer Service Training is offering self paced hard ware service training packages on various HP PC PC peripheral and instrument products Currently a total of 55 hardware service training packages and 11 video 2ND QUARTER computer technology prestudies are available Service training packages are available for products such as the HP 72425A Vectra PC the HP 2227A QuietJet printer and the HP 4971A LAN Protocol Analyzer Video pre studies include the disc mass storage and computer printer and the mag tape fundamentals The self paced hardware service
4. 2602A00316 and below HP 44727B and 2602A00252 and below HP 44727C Modifi cation to prevent spurious noise and spikes HP 51089A DISPLAY UNIT 51089A 3 All serials Packaging procedure to prevent damage during shipment HP 62605M P31 SYSTEM DC POWER SUPPLY 62605M P31 1 All serials Modifications to improve reliability HP 64228S 80286 EMULATOR POD 64228S 2 POD repair number 2627A0160 and below Recommended replacement 80286 Features Board HP 70900A LOCAL OSCILLATOR 70900A 3A Serials 2629A and below Instructions for installing the HP 70900 Memory Plus Controller Board 70900A 5 Serials 2612A00727 and below Recom mended modification to the sampler bias drive circuit 70900A 6 Serials 2612A and below Modification to prevent false external reference detection 70900A 7 Serials 2642A and below Recommended A2 Video Processor replacement 70900A 8 Serials 2629A01017 and below Modification to eliminate triggering using high sweep output 70900A 9 Serials 2612A00835 and below Modification to reduce harmonic output levels at 300 MHz output ports 70900A 10 Serials 2612A00667 and below Modifica tion to increase calibrator output adjustment range 70900A 11 Serials 2606A and below Preferred Fre quency Control Assembly 70900A 12 Serials 2717A and above Installation instructions for the HP 70900 RAM ROM Board Assembly firmware upgrade kit 70900A 14 All serials Compatibility requirements for different
5. 86603A 7 O 3457A 7 O 3776B 0A O 4936A 2A O 5386A 1 O 8175A 1 oO 8673D 8 o 51089A 3 O 86603A 8 3497A 23D S O 3776B 18D O 4936A 4A oO 6030A 3A O 8558B 33A oO 8673E 1 oO 62605M P31 1 O 3552A 11 O 3776B 36 O 4936A 7 oO 6030A 4 O 8642A 1 o 8753A 1 O 64228S 2 O 3561A 9 O 3779C 0A O 4947A 5 oO 6031A 6A O 8642A 2 O 8770A 3 o 70900A 3A O 3562A 4 o 3779D 0A O 4947A 6 O 6031A 7 O 8642B 1 o 8770A 6A O 70900A 05 O 3562A 5 o 3780A 0A O 4951B 4 O 6032A 5A O 8642B 2 o 8770A 7 o 70900A 06 O 3575A 4C oO 3781B 0A O 6032A 6 O 8656B 5 o 8901B 1 o 70900A 07 Please photocopy this order form if you do not want to cut off the page Hewlett Packard Canada Ltd Canada Posies i anada 6877 Goreway Drive 4 de shrank paid Post Paye Mississauga Ontario L4V 1M8 Bulk Ennombre BENCH BRIEFS third troisi me 2ND QUARTER 1987 Sess classe Volume 27 Number 2 REXDALE 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 EO contributions are welcomed Ty6t 907d 09085 AIDC Please send them to the NOISIAIC 1 9dd4NS LINdGOYd Bench Briefs Editor SawyP 1101H238 Editor Jim Bechtold Hewlett Packard All rights reserved Permission to reprint Bench Briefs granted upon written request to the Editor Printed in U S A 6 BENCH BRIEFS 2ND QUARTER
6. A Service note index HP 3764A DIGITAL TRANSMISSION ANALYZER 3764A 14A Serials 2528U00857 and below Clock oscillator retrofit kit Std 002 003 3764A 19A Serials between 2615U01162 and 2712U01637 Retrofit kit to upgrade the auxiliary analog input 3764A 20 Serials between 2615U01152 and 2712U01637 Preferred replacement of PROMS 3764A 21 All serials Mechanical parts identification HP 3776A B PCM TERMINAL TEST SET 3776A 0A Service note index 3776A 31 Serials 2444U00292 and below Re commended updates to firmware Supersedes 3776A 5 6 12 14 15B 22C 3776B 0A Service note index 3776B 18D Serials 2437U00642 and below Frequency update instructions for data measurement option 001 3776B 36 Serials 2437U00642 and below Recom mended updates to firmware Supersedes 3776B 5 6 12 14 15B 30A 4 BENCH BRIEFS HP 3779C D PRIMARY MULTIPLEX ANALYZER 3779C 0A Service note index 3779D 0A Service note index HP 3780A PATTERN GENERATOR ERROR DETECTOR 3780A 0A Service note index HP 3781B PATTERN GENERATOR 3781B 0A Service note index HP 3782B ERROR DETECTOR 3782B 0A Service note index HP 3785A B JITTER GENERATOR amp RECEIVER 3785A 0A Service note index 3785A 20 Serials 2519U00536 to 2519U00685 Po tential problem due to unused gates of A11U23 3785B 0A Service note index 3785B 18 Serials 2518U00481 to 2518U00690 Po tential problem due to unused gates of A11U23 HP 3789B DS3 TRA
7. A13 HP 4951B C PROTOCOL ANALYZER 4951B 4 Serials 2612A03451 and below Improved yoke assembly 4951C 3 Serials 2647A01655 and below and 2631F50496 and below Improved yoke assembly HP 5061A CESIUM BEAM FREQUENCY STANDARD 5061A 11C All serials Replacement kit for A10 oscil lator assembly P N 05061 6170 HP 5180T U DIGITIZING OSCILLOSCOPE 5180T U 1 Serials 2640A and below except 2510A01123 2510A01159 2630A01203 2630A01207 and 2640A01231 through 2640A01245 Modification to synchronize the trigger timing in the 5180U HP 5335A UNIVERSAL FREQUENCY COUNTER 5335A 21 All serials with Rev 1 1 firmware Firmware Revision 1 1 programming anomalies and worka rounds for the HP 9000 Series 200 Controllers HP 5345A 500 MHz ELECTRONIC COUNTER 5345A 38 Serials 2040A and below Recommended adjustment procedure after replacing ICs on the A9 gate control assembly HP 5350A B MICROWAVE FREQUENCY COUNTER 5350A 6 Serials 2632A and below Recommended modification to the A8 power supply assembly 5350B 2 Serials 2632A and below Recommended modification to the A8 power supply assembly HP 5351A B MICROWAVE FREQUENCY COUNTER 5351A 6 Serials 2632A and below Recommended modification to the A8 power supply assembly 5351B 2 Serials 2632A and below Recommended modification to the A8 power supply assembly HP 5352A B MICROWAVE FREQUENCY COUNTER 5352A 5 Serials 2632A and below Recommended modification to the A8 power supp
8. ENERATOR 8161A 7 Serials 2648G01006 and above New micro processor board to improve performance 8161A 8 Serials 2648G01006 and above Option 700 MATE compatibility now installed HP 8175A DIGITAL SIGNAL GENERATOR 8175A 1 Serials 2612G00416 and above Output amplifier heatsink uses metric hardware HP 8558B SPECTRUM ANALYZER A 8558B 33A Serials 2436A10965 and below Recom mended video filter potentiometer replacement HP 8642A B SIGNAL GENERATOR 8642A 1 All serials Explanation of A06 and A07 transient errors 8642A 2 Serials 2637A and below Modification to limit in rush current 8642B 1 All serials Explanation of A06 and A07 transient errors 8642B 2 Serials 2637A and below Modification to limit in rush current HP 8656B SIGNAL GENERATOR 8656B 5 Serials 2511A and above Addition of high stability time base 8656B 6 Serials 2622A and below Output transistor heatsink replacement 8656B 7 Serials 2511A thru 2639A Recommended replacement cooling fan HP 8660A B C SYNTHESIZED SIGNAL GENERATOR 8660A 32 Serials 2652A and above Incompatibility with RF section plug ins 8660C 13 Serials 2706A and above Incompatibility with RF section plug ins HP 8673B C D E SYNTHESIZED SIGNAL GENERATOR 8673B 4 Serials 2421A and below Procedure for replacing A1A4 Pulse Driver Board 2ND QUARTER 8673B 5 All serials Option switch troubleshooting procedure 8673B 6 Serials 2634A to 2704A Preferred replace me
9. HEWLETT PACKARD L BENGH BRIGIS SERVICE INFORMATION FROM HEWLETT PACKARD A Rotary Pulse Generator is another form of the variable control you see so often on schematics These familiar variable controls are usually desig nated by components with arrows through them and are used to vary a frequency or power level in order to control an instrument and make it more useable Some of the problems associated with these variable analog controls are that they tend to get noisy with age will physically wear out with contin ued use and have a limited range stop to stop Enter the rotary pulse generator a digital variable control that can be used to adjust power levels or fre quencies or manipulate graphics markers and waveforms It has no stops and can adjust the unit con tinuously from one end of its range to the other end It also has variable speed that is the faster you spin it o COUNTER CLOCK ROTATION CCW Figure 2 WHT RED Figure 3 Pub No 5952 0128 Figure 1 the more of a change it imparts to the circuit it is controlling The RPG contributes no noise to the circuit is externally programmable and its po sition can be read by an external program This rotary control in some cases takes the place of pushbuttons on a keyboard cS CLOCKWISE ROTATION CW DIRECTION FLIP FLOP Sy MEF i 3 k 7 ao YG Ru 8 ter 1987 FILE CO i Ga en DEMOVE Bt Bs BOW S
10. NSMISSION TEST SET 3789B 1 Serials 2638U00143 and below Modification to eliminate power supply start up problem HP 3793B IF BB RECEIVER 3793B 0A Service note index HP 3852A DATA ACQUISITION AND CONTROL UNIT 3852A 0B Service note index HP 4062B SEMICONDUCTOR PARAMETRIC TEST SYSTEM 4062B 3 Serials 4062B 2519J00144 and below 4141B 2519J00160 and below Replacement PROMS for the HP 4141B HP 4063A SEMICONDUCTOR PARAMETER ANALYSIS SYSTEM 4063A 1 Serials 4063A 2520J00117 and below 4141B 2519J00172 and below Replacement PROMS for the HP 4141B 4063A 2 Serials 4063A 2520J00115 and below 4141B 2519J00160 and below Replacement PROMS for the HP 4141B HP 4141B DC SOURCE MONITOR 4141B 1 Serials 2519J00160 and below Replacement PROMS for the HP 4141B HP 4145B SEMICONDUCTOR PARAMETER ANALYZER 4145B 1 Serials 2608J00498 and below Replacement PROMS for the HP 4145B HP 4936A TEST IMPAIRMENT MEASUREMENT SET 4936A 2A All serials Retrofit for battery operation options 001 and 003 4936A 4A Approximate serials 779 to 1030 Recom mended replacement for plastic HARRIS devices HP P N 1826 0735 4936A 7 Interchanged pages in the operating and service manual HP P N 04936 90022 HP 4947A TRANSMISSION IMPAIRMENT MEASURING SET 4947A 5 Serials 2708U00176 and below Firmware modification to rectify printout error Supersedes 4947A 3 4947A 6 Serials 2708U00176 and below Preferred replacement of PROM U58 on
11. V ba B OUTPUT WHT BLK BRN Figure 1 shows a typical circuit for a rotary pulse generator It consists of a shaft encoder sending 120 light pulses to the phototransistors Q1 and Q3 for each full shaft rotation The outputs of Q1 and Q3 are amplified by Q2 and Q4 and squared by two Schmitt trigger gates Figure 2s a timing diagram showing how the circuit works to designate clockwise or counterclockwise rota tion At the moment output A goes negative output B will be either positive clockwise or negative counterclockwise The shaft encoder is designed so that the A and B transitions are always shifted by 90 degrees Figure 3 illustrates a typical RPG connected to a sensing circuit As mentioned earlier the RPG generates 120 output pulses at each channel for one full rotation independent of the speed at which it is rotated To im prove the tuning sensitivity it is desirable that the number of output Hewlett Packard 1987 pulses would be somewhat propor tional to the rotating speed of the RPG To achieve this a pulse swal lower is connected in the circuit At low rotating speed the pulse swal lower suppresses two out of three pulses at medium speed one out of two and a high rotation speed the pulse swallower is inactive There fore when you turn the RPG slowly the change it imparts to the device is slower by two thirds of 120 pulses and when you spin the control as fast as you can the
12. change it imparts is at the full 120 pulses As shown in Figure 4 C2 and C3 are charged according to the speed of the RPG At low speed it takes three pulses to charge C2 to a high logic level while C3 charges only at high speed Therefore C2 and C3 control how many times the go flip flop will be clocked during a full rotation Each time the go flip flop is clocked Figure 4 Q2 discharges C2 and C3 While the direction flip flop indicates to the digital control unit whether it has to count up CW or down CCW the GO input counts the pulses coming from the shaft rotation Therefore the contents of the digital control unit really an up down counter can be used instead of a digital input from a keyboard E Hardware Service Training Investing in Self Support Wei Huang HP Customer Training HP 1000 Automatic Test System Service Training The Hewlett Packard Advanced Manufacturing Systems Organization in Cupertino CA is offering a 5 day HP 1000 Automatic Test System cus tomer service training course starting October 5th 1987 2 BENCH BRIEFS Course 50036A 3 100 ea provides the participant with detailed ATS 1000 operation and service knowledge Certain aspects of the RTE A and RTE 4 controlling software will also be discussed The course is struc tured as 50 percent lecture and 50 percent lab Interested customers should contact their HP sales representative for reg
13. ly assembly 5352B 2 Serials 2632A and below Recommended modification to the A8 power supply assembly HP 5359A TIME SYNTHESIZER 5359A 7 All serials Performance tests for the 5359A HP 5370A UNIVERSAL TIME INTERVAL COUNTER 5370A 11A All serials Addition to front end checkout procedure HP 5386A FREQUENCY COUNTER 5386A 1 Serials 2704A00453 and below A3U1 mis loading problem Possible wrong part UI Op Amp in the A3 Pre Scaler Assembly Incorrect P N 1826 0493 Correct P N 1820 0493 HP 6030A SYSTEM DC POWER SUPPLY 6030A 3A Serials 2703A00505 and higher Discrete fault indicator FLT and remote inhibit INH en hancement for Standard and Option 700 Models 6030A 4 Serials 2528A00364 and below Modification to improve opto isolator reliability HP 6031A SYSTEM DC POWER SUPPLY 6031A 6A Serials 2713A00623 and higher Discrete fault indicator FLT and remote inhibit INH en hancement for Standard and Option 700 Models 6031A 7 Serials 2609A00502 and below Modification to improve opto isolator reliability HP 6032A SYSTEM DC POWER SUPPLY 6032A 5A Serials 2719A01941 and higher Discrete fault indicator FLT and remote inhibit INH en hancement for Standard and Option 700 Models 6032A 6 Serials 2615A01480 and below Modification to improve opto isolator reliability HP 6033A SYSTEM DC POWER SUPPLY 6033A 4A Serials 2713A02552 and higher Discrete fault indicator FLT and remote inhibit INH en hancement for
14. ng Revision Code 2520 and below Modification to correct autoranging problem on the HP 25501 A D Converter Assembly HP 3047A PHASE NOISE MEASUREMENT SYSTEM 3047A 1 All serials Installing and calibrating the system HP 3065 BOARD TEST SYSTEM 3065 18A HP 3065 self support documents training and equipment 3065 45 Serials HP 3065CL 2542A00169 HP 3065CX 2544A00209 and below Configuring the HP 12009 HP IB Interface Cards 3065 46 Replacing the 5V fixed DUT power supply in the HP 3065HL 3065 48 HP 3253A NOT B version Analog Stimulus Response Unit serials 1814A01875 and below Modification to prevent ASRU source amplifier oscillation 3065 49 New field replaceable unit for HP 3253A B ASRU HP 3314A FUNCTION GENERATOR 3314A 2 Seriais 2505A05141 and below New PC Board Headers and Cables HP 3325A SYNTHESIZER FUNCTION GENERATOR 3325A 21 Serials 2562A23808 and above New A16 Control Assembly 3325A 22 Serials 2512A21906 and above New A23 Attenuator Assembly HP 3453A DIGITAL STIMULUS RESPONSE UNIT 3453A 6 Replacement procedures for the mother board within the 3453A DSRU BENCH BRIEFS 3 HP 3455A DIGITAL VOLTMETER 3455A 25 All Serials Replacement procedures for Outguard Digital Board 03455 66501 HP 3457A DIGITAL MULTIMETER 3457A 2B Serials 2703A02955 and below with Firm ware Revision 4 1 Firmware modifications in the HP 3457A 3457A 7 Serials 2538A02954 and above New Main Controller Boa
15. nt for A2A10 and A2A11 memory board assemblies 8673B 7A All serials Recommended YTM A1A10 replacement 8673C 5 All serials Option switch troubleshooting procedure 8673C 6 Serials 2634A to 2704A Preferred replace ment for A2A10 and A2A11 memory board assemblies 8673C 8 All serials Recommended YTM A1A10 replacement 8673D 5 All serials Option switch troubleshooting procedure 8673D 6 Serials 2634A to 2704A Preferred replace ment for A2A10 and A2A11 memory board assemblies 8673D 8 Serials 2540A and below Recommended firmware EPROM replacement 8673E 1 Serials 2704A and below Preferred replace ment for A2A10 and A2A11 memory board assemblies HP 8753A NETWORK ANALYZER 8753A 1 All serials Procedure for performing A9 CPU EEPROM backup before a failure occurs HP 8770A ARBITRARY WAVEFORM SYNTHESIZER 8770A 3 Serials 2627A and below Instructions for installing multiple 8770A synchronization capability 8770A 6A All serials Firmware history and upgrade procedures 8770A 7 Serials 2627A and below Instructions for installing new clock assembly for multiple 8770A synchronization capability HP 8901B MODULATION ANALYZER 8901B 1 Serials 2619A and below Modification to resolve HP 8901B intermittent lockup and HP IB hangup HP 8902A MEASURING RECEIVER 8902A 1 Serials 2616A and below Modification to resolve HP 8902A intermittent lockup and HP IB hangup 8902A 2 Serials 2305A to 2523A Modification t
16. o prevent invalid error 06 indication HP 8903B AUDIO ANALYZER 8903B 1 All serials Plug in filter installation kits 8903B 2 Serials 2652A02090 thru 2652A02117 Re versed capacitor on A2 Input Amplifier Assembly HP 8903E DISTORTION ANALYZER 8903E 1 All serials Plug in filter installation kits 8903E 2 Serials 2652A00205 thru 2652A00217 Re versed capacitor on A2 Input Amplifier Assembly HP 10761A BINARY MULTIPLIER BOARD 10761A 1A Series 2140C serials 2140A00348 to 2140A00400 Modification to ensure ambient com pensation factor is calculated HP 16291A 4062B FIELD SERVICE INVENTORY 16291A 1 Replacement ROMS for HP P N 04141 69533 A3 boards HP 44701A INTEGRATING VOLTMETER FOR THE HP 3852A 44701A 3 Serials 2703A02228 and below Bad first reading when measuring acV using the autorange function 44701A 4 Serials 2703A02228 and below Error in range changes when measuring acV using the autorange function HP 44702A B HIGH SPEED VOLTMETER FOR THE HP 3852A 44702A B 6 Serials 2630A00742 HP 44702A and below and 2630A00572 HP 44702B and below DC voltage performance test failures caused by noisy dc voltage readings HP 44721A DIGITAL INPUT MODULE FOR THE HP 3852A 44721A 1 Serials 2552A01764 and below ERROR 25 DEVICE FAILURE SLOT xxxx INTR CH and lost interrupts when using multiple channel interrupts HP 44727A B C DAC MODULE FOR THE HP 3852A 44727A B C 1 Serials 2602A00564 and below HP 44727A
17. package is 300 each The video prestudy is 350 per set All self paced items are orderable from HP at 916 786 8000 ext 8068 For the latest self paced training product list please call Customer Service Training at 415 691 5300 5905 or use our toll free numbers 800 523 0696 U S or 800 882 9595 California Safety Related Service Notes Service notes from HP relating to personal safety and possible equip ment damage are of vital importance to our customers To make you more aware 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 poten tial safety problems we are high lighting safety related service notes here with a brief description of each problem Also in order to draw your attention to safety related service notes on the service note order form at the back of Bench Briefs each appropriate number is highlighted by being printed in color HP 3497A Data Acquisition and Control Unit Product Safety Service Note 3497A 23D S is a replacement service note for 3497A 23A S described in the January February 1986 issue of Bench Briefs HP 6214B DC Power Supply A shock hazard exists if the ac line switch should fail shorting the ac line voltage to the metal toggle han dle The safety ground wire connect ing the switch housing to the earth ground was omitted on HP 6214B models with se
18. rd documentation HP 3497A DATA ACQUISITION AND CONTROL UNIT 3497A 23D S Serials 2448A15955 and below Possible shock hazard HP 3552A TRANSMISSION TEST SET 3552A 11 New display board and display LEDS Supersedes 3552A U 103 HP 3561A DYNAMIC SIGNAL ANALYZER 3561A 9 Serials 2549403144 and below Modification to improve Periodic Noise Source HP 3562A NETWORK ANALYZER 3562A 4 Serials 2502A01640 to 2502A02287 Inter mittent attenuation problem near 28 kHz solved 3562A 5 All serials How to tell which firmware is installed in the instrument HP 3575A GAIN PHASE METER 3575A 4C All serials Identification of panel meters and interconnect boards HP 3577A NETWORK ANALYZER 3577A 10 Serials 2503A12340 and below Changing parts on input board improves dynamic linearity 3577A 11 All serials Adding capacitors improves ratio phase accruacy after A1 receiver board repair 3577A 12 All serials Changing resistor value improves ratio amplitude flatness after A1 receiver board repair HP 3580A SPECTRUM ANALYZER 3580A 13 Serials 2030A06767 and below Recom mended replacement for counter multiplexer IC A33U2 on the FCM display board HP 3582A SPECTRUM ANALYZER 3582A 14 Serials 2508A06671 and below Modification to decrease harmonic distortion HP 3585A SPECTRUM ANALYZER 3585A 12 Serials 2504A05459 and below Modification to prevent OSC UNLOCK for resolution bandwidths of 3 kHz and below HP 3746A SLMS 3746A 0
19. rial numbers 2629A11237 and 2629A11245 This problem can be corrected by installing HP Service Kit 5060 3256 which consists of a solder terminal that goes beneath the switch body and an 18 AWG green and yellow wire to connect the solder terminal to the ground terminal of the front panel For more information please order Product Safety Service Note 6214B 2 S from this issue of Bench Briefs O Need Any Service Notes They re free Here s the latest listing of service notes They recommend modifications to Hewlett Packard instruments to increase reliability improve perform ance or extend their usefulness Use the form at the rear of Bench Briefs to order free of charge service notes for several instruments 2ND QUARTER If you would like to purchase large quantities of service notes covering a wide range of instruments or if you desire a complete history of all service notes documenting all changes to your instruments Hewlett Packard offers a microfiche library for a one time charge There is also a microfiche subscription service available that automatically updates the library on a quarterly schedule The part numbers for the service note microfiche library and subscrip tion service are 5951 6511 5951 6517 Library Subscription service Contact your local HP Sales Office for ordering information HP 2250 DATA ACQUISITION AND CONTROL UNIT 2250 29A Engineeri
20. spectrum analyzer systems HP 71000A SERIES MODULAR SPECTRUM ANALYZER SYSTEM 71000A 1 All serials System service kit HP P N 71000 60002 parts list 71000A 2 All serials System service kit updated by three new kits HP 86601A RF SECTION PLUG IN 86601A 10 Serials 2437A through 2704A Modification to prevent full power output in remote mode at turn on 86601A 11 Serials 2634A and below Preferred re placement A8 Attenuator Driver Assembly to prevent undetermined attenuator setting at turn on causing fuse blowing in mainframe HP 86602B RF SECTION PLUG IN 86602B 5 Serials 2437A through 2703A Modification to prevent full power output in remote mode at turn on 86602B 6 Serials 2450A and below Preferred re placement A9 Attenuator Driver Assembly to prevent undetermined attenuator setting at turn on causing fuse blowing in mainframe HP 86603A RF SECTION PLUG IN 86603A 7 Serials 2446A through 2703A Modification to prevent full power output in remote mode at turn on 86603A 8 Serials 2621A and below Preferred re placement A9 Attenuator Driver Assembly to prevent undetermined attenuator setting at turn on causing fuse blowing in mainframe BENCH BRIEFS 5 Service Note Order Form If you want service notes please check the appropriate boxes below For European customers ONLY Name
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