HP-Bench-Briefs-1988..
Contents
1. 8753A 8 All serials Firmware update replacement kit HP P N 08753 60XXxX 8753A 9 All serials Revision A 01 performance test software HP 8757A SCALAR NETWORK ANALYZER 8757A 6 All serials Modification to prevent intermittent memory loss HP 8902A MEASURING RECEIVER 8902A 5 Serial prefixes 2741A and below Modification to resolve set reference error HP 8970A B NOISE FIGURE METER 8970A 12 All serials Preferred replacement for oscil lator transistor A11A1Q1 8970B 2 All serials Preferred replacement for oscillator transistor A11A1Q1 WWW HPARCHIVE COM HP MODEL 9571A DIGITAL TEST STATION 9571A 25A S All serials Potential shock hazard if the power line ground connection to a protective earth terminal is defeated HP 37204A B HP IB EXTENDER 37204A 02 Serials 2547U03590 and below Modifi cation to correct power supply failure when both port fault lamps stay on 37204B 01 Serials 2626U00450 and below Modifi cation to correct power supply failure when both port fault lamps stay on HP 54110D DIGITIZING OSCILLOSCOPES 54110D 9 Serial prefixes 2710A and below New analog power supply offers family compatability 54110D 10 Serial prefixes 2710A and below New primary power supply offers family compatability and improves reliability HP 54111D DIGITIZING OSCILLOSCOPES 54111D 3 Serial prefixes 2719A and below New primary power supply offers family compatability and improves reliability HP 54112D DIGITI2. designators from the recorded sheet and paste them on the breadboard next to the component When you are done your breadboard looks very similar to a printed circuit board instead of the usual rats nest of wires The next issue of Bench Briefs will contain detailed calculations and instructions on how to use the copper tape to build a common stripline filter o John Kristiansen John Kristiansen a native of Den mark joined Hewlett Packard in 1984 and is working as a bench technician at HP Labs in the thin film depart ment for disc storage technology John enjoys 8mm sound film as a hobby is married has two boys and lives in Sunnyvale California 1ST QUARTER mn Attention HP 8671 72 and 8673 Synthesized Signal Generator Owners This issue of Bench Briefs contains new service notes that describe pro cedures for improving performance and protection and tips on trouble shooting the microwave signal path of your generators For example the rectifier assembly is a common unit in the HP 8671 72 and 8673 series of generators Several service notes in this issue describe troubleshooting procedures to test if the diodes are shorted to the heat sink through a damaged anodized surface If the surface is damaged instructions are provided for placing a mica insulating washer between the heat sink and each of the rectifiers Detailed microwave signal path troubleshooting tips are provided for the
3. 50 Ohm airline part number 85051 60007 and 25 Ohm mismatch airline part number 85051 60008 when used with the HP 85050C 7 MM precision calibration kit HP 85629A TEST AND ADJUSTMENT MODULE 85629A 1A All serials New ROM upgrade kit HP P N 85629 60002 HP 85685A RF PRESELECTOR 85685A 13 Serial prefixes 2620A and below Instruc tions for installing susceptibility improvement kit 85685A 15 Serial prefixes 2620A and below Instruc tions for installing residual improvement kit BENCH BRIEFS 7 Service Note Order Form If you want service notes please For European customers ONLY Name check the appropriate boxes below 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 Palo Alto California 94303 The Netherlands zip O 435B 3 O 3780A 33 O 4954A 1 O 8642B 7 O 8673C 14 O 8757A 6 O 436A 12 oO 3781A 5 O 4954A 2 O 8662A 12C O 8673C 15 O 8902A 5 O 438A 6 O 3781B 11 O 8160A 14 O 8662A 15 O 8673D 13 O 8970A 12 O 1340A 8 O 3782A 7 O 8180B 1A O 8663A 6C O 8673D 14 O 8970B 2 O 1345A 8 O 3782B 12 8481A 5 O 8663A 9 O 8673D 15 oO 9571A 25A S O 1349A D 5 O 3785A 21 O 8559A 31 O 8671B 2 O 8673D 16 37204A 02 O 1650A 1651A 1 O 3785B 1
4. 562A operates within the safety standard for leakage current when operated within the stated line frequencies of 48 to 66 Hz Therefore make certain the instrument is op erated only within these specified ac line frequencies of 48 to 66 Hertz For more information order safety service note 3562A 09 S using the Bench Briefs order form The note describes a kit HP P N 03562 84405 containing a label to attach to the rear panel of the instrument HP 9571A Digital Test Station A potential shock hazard may exist if the power line ground connection to a protective earth terminal is defeated Product Safety Service Note 9571A 25A S reemphasizes this warning and describes a label HP P N 7121 4972 to be attached to the input power module near the access plate Order this safety service note from this issue of Bench Briefs Model 3562A WWW HPARCHIVE COM BENCH BRIEFS 5 HP 85043A B System Cabinets Some of the cabinets may have improperly stripped wires that are connected to the circuit breakers and terminal block In these cases the fastening screw pushes through the insulation making a poor contact with the wire There have been two instances where these improperly stripped wires have caused the circuit breakers and wire insulation to fail due to overheating For more information please order safety service note 85043B 01 S from this issue of Bench Briefs E azk eon O BENCH BRIEES SEROK h Need An
5. 9 O 8566A 20B O 8671B 03 O 8673E 5 O 37204B 01 oO 1650A 1651A 3 O 3787B 2 O 8566B 11A oO 8672A 19 O 8673E 6 O 54110D 9 O 3235A E 5 O 3787B 3 O 8568A 44B O 8672A 20 O 8673E 07 O 54110D 10 O 3235A E 6 O 4938A 2A O 8568B 12A O 8673B 11 O 8673E 08 oO 54111D 3 O 3488A 11B O 4948A 2 8590A 2A O 8673B 12 amp 6753A r o 54112D 1A o 3552A 17 O 4948A 3 8590A 5 O 8673B 13 oO 8753A 6 8757A 5 O 54120T 6 oO 3562A 09 S O 4948A 5 O 8590A 6 O 8673B 14 oO 8753A 7A O 54201A D 10 O 3746A 4A O 4952A 2A O 8590A 7 O 8673C 12 8753A 8 O 54201A D 11 O 3746A 26 O 4952A 3A O 8642A 6 8642B 6 O 8673C 13 8753A 9 oO 54201A D 12 oO 3746A 27 A O 70900A 14B O 3764A 22A N r F O 85029A 1 O 3779C 36 Pupu O 85043B 1 S 0 3779D 41 Lot 9Q 7 O 85046A B 1 O 3779D 42 oO 85051B 1 Please photocopy this order form if you do not 85629A 1A want to cut off the page O 85685A 13 85685A 15 Bulk Rate U S Postage PAID Sunnyvale CA Permit No 804 ANSE 9078 iYOddNnS YIWOLSNI Sawer 0090S AIGO 3QGIMGIYOM 09701H3398 S All rights reserved Permission to reprint Bench Briefs granted upon written request to the Editor 8 BENCH BRIEFS WWW HPARCHIVE COM Printed in U S A 1ST QUARTER
6. ARY MULTIPLEX ANALYZERS 3779C 36 All serials Recommended power transistor replacement on A29 power supply assembly 3779D 41 All serials Conversion of HP 3779D option 002 to HP 3779D option 001 3779D 42 All serials Recommended power transistor replacement on A29 power supply assembly HP 3780A PATTERN GENERATOR ERROR DETECTOR 3780A 33 Serials 2524U03804 2524U03933 inclusive Possible faulty capacitors A30C1 and A30C2 with date code 8643L on A30 power supply assembly HP 3781A B PATTERN GENERATOR 3781A 5 Serials 2524U00837 2704U00886 inclusive Possible faulty capacitors A30C1 and A30C2 with date code 8643L on A30 power supply assembly 3781B 11 Serials 2523U01091 2703U01170 inclusive Possible faulty capacitors A30C1 and A30C2 with date code 8643L on A30 power supply assembly HP 3782A B ERROR DETECTOR 3782A 7 Serials 2524U00832 2524U00876 inclusive Possible faulty capacitors A30C1 and A30C2 with date code 8643L on A30 power supply assembly 3782B 12 Serials 2636U01126 2703U1215 inclusive Possible faulty capacitors A30C1 and A30C2 with date code 8643L on A30 power supply assembly HP 3785A B JITTER GENERATOR AND RECEIVER 3785A 21 Serials 2519U00646 2519U00718 inclusive Possible faulty capacitors A30C1 and A30C2 with date code 8643L on A30 power supply assembly 3785B 19 Serials 2518U00651 2518U00710 inclusive Possible faulty capacitors A30C1 and A30C2 with date code 8643L on A30 power supply assembly HP 3787B DIG
7. C CA eackano 0 0 bilife SERVICE INFORMATION FROM HEWLETT PACKARD 1st Quarter 1988 Using Copper Tape to Fabricate RF Breadboard Circuits John Kristiansen Hewlett Packard Introduction Do you use insulated wire when breadboarding your circuit boards Do you also use insulated wire for high frequency circuits for example above 50 MHz At these higher fre quencies your wire begins to look like an inductor and the whole circuit may start to oscillate at the slightest disturbance In this article I will describe another method of breadboarding RF circuits using adhesive backed copper tape Some of the advantages of using copper tape are e The copper tape does not look like an inductor at high frequencies The circuit is more stable at high frequencies the tendency toward oscillation is minimized The breadboard circuit is similar in appearance to the final printed circuit board e The circuit is easier to trace and troubleshoot e Itis easier to make circuit changes on the board Copper tape is useful in building microwave stripline filters bidi rectional couplers etc Pub No 5952 0131 Circuit Layout If it s not already done the first step is to mark your schematic with component reference designators connector pin numbers test point designations etc to identify all items and components that will appear on the layout see Figure 1 for a simple schematic You can st
8. HP 8481A POWER SENSOR 8481A 5 All serials Curing intermittent operation HP 8559A SPECTRUM ANALYZER 8559A 31 Serial prefix 2819A and below Redesigned sweep generator board with improved 10 volt reference power supply to provide improved performance HP 8566A SPECTRUM ANALYZER 8566A 20B All serials HP 8566AB retrofit kit instruc tions formerly 8566A 01K HP 8566B SPECTRUM ANALYZER 8566B 11A All serials HP 8566AB retrofit kit formerly 8566A 01K HP 8568A SPECTRUM ANALYZER 8568A 44B All serials HP 8568AB retrofit kit instruc tions formerly 8568A 01K HP 8568B SPECTRUM ANALYZER 8568B 12A All serials HP 8568AB retrofit kit formerly 8568A 01K HP 8590A SPECTRUM ANALYZER 8590A 2A All serials Option H50 CATV retrofit instal lation instructions 8590A 5 All 75 Ohm input options 001 Instructions to correct the HP 8590A 75 Ohm option 001 readout from dBm to dBmvV after replacing firmware ROMs 8590A 6 All 75 Ohm input options 001 50 Ohm input List of programs to correct or change the CRT readout from dBm to dBmV or from dBmV to dBm 8590A 7 All serials Display modifications to improve performance HP 8642A B SYNTHESIZED SIGNAL GENERATOR 8642A 6 8642B 6 A14 module serial prefixes 2531A and below Modification to resolve low output power in the Heterodyne band HP8642B 7 A19 module serial prefixes 2517A to 2640A inclusive A19 doubler attenuator module replacement for maximum output level degr
9. HP 8673B C D E series of gener ators that help determine whether a fault is in the ALC circuitry or in the microwave signal path To aid in MW path troubleshooting the service note provides signal levels at various test points that reference back to the main troubleshooting section in the operating and service manual These service notes are free just use the order form at the rear of Bench Briefs o 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 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 appropri ate number is highlighted by being printed in color HP 3562A Dynamic Signal Analyzer Product Safety Service Note 3562A 09 S describes a possible safety hazard that may exist if the instru ment is operated at a nominal line frequency of 400 Hz and the protective earth ground is defeated In these instances the HP 3562A exceeds the 3 5 mA leakage current limit by 7 mA safety standard 1ST QUARTER The HP 3
10. ITAL DATA TEST SET 3787B 2 Serials 2703U00206 and below Elimination of spurious pulses from DS1 1C Rx input A5 U520 3787B 3 All serials Conversion of HP 3787B standard to option 001 jitter measurement capability HP 4938A NETWORK CIRCUIT ACCESS TEST SET 4938A 2A Serials 2450A00702 and below Modification to correct a potential failure HP 4948A IN SERVICE TRANSMISSION MEASURING SET 4948A 2 A8 A11 schematic diagram correction 4948A 3 All serials Preferred replacement part number for A7 tray retaining screw MP61 4948A 5 All serials Preferred replacement for display module MP7 HP 4952A PROTOCOL ANALYZER 4952A 2A Serials 2725A and below and 2739F and below Improved yoke assembly 4952A 3A Serials 2726A01194 and below and serials 2635F20001 thru 2635F20454 Modification to fix potential disc access problem non LIF format disc out disc error 1ST QUARTER HP 4954A PROTOCOL ANALYZER 4954A 1 Serial number range listed in text of note Firmware revision 1 1 upgrade to correct critical bugs and intermittent failures 4954A 2 Serial number range listed in text of note Replacement of A5 U701 board enable driver HP 8160A PROGRAMMABLE PULSE GENERATOR 8160A 14 Serials 2650G00746 to 2650G00785 inclu sive Possible short of HP IB REN line to ground causes unit to stay remote operation when addressed to listen HP 8180B DATA GENERATOR 8180B 1A Serials 2640G00100 to 2640G00148 Im proved firmware revision
11. ZING OSCILLOSCOPE 54112D 1A Serials 2735A00173 and below Modifi cation to prevent loss of resolution or excessive noise on trace HP 54120T DIGITIZING OSCILLOSCOPES 54120T 6 All serials How to obtain semi rigid S and semi rigid U cables used for test and adjustment HP 54201A D DIGITIZING OSCILLOSCOPES 54201A D 10 All serials Locked high trace or no trace may be result of input FET failure 54201A D 11 Serial prefixes 2716A and below Im proved input FET protection available 54201A D 12 All serials Software calibration procedure summary HP 70900A LOCAL OSCILLATOR 70900A 14B All serials Hardware firmware compatibility HP 85029A VERIFICATION KIT 85029A 1 All serials Transferring data files from replacement disc to the master disc HP 85043A B SYSTEM CABINETS 85043B 1 S 85043A serials 2622A01352 and below and 85043B serials 2623A00172 and below Elimi nation of a potential safety hazard in the circuit breakers HP 85046A B S PARAMETER TEST SET 85046A B 1 85046 serials 2542A01553 and below and 85046B serials 2542A00220 and below Modi fication to make sure attentuator and or RF switch actuates HP 85051B 7 MM VERIFICATION KIT 85051B 1 Serials 2705A00001 through 2705A00162 certified recertified before Oct 1987 Exceptions 2705A00137 2705A00139 2705A00146 2705A00147 2705A00150 2705A00152 12705A00154 2705A00159 2705A00160 2705A00161 Modification to prevent possible damage to the
12. adation HP 8662A SYNTHESIZED SIGNAL GENERATOR 8662A 12C Serial prefix 2429A and below Modification to improve low frequency loop performance and eliminate intermittent status errors 03 04 8662A 15 All serials Instructions for replacing the cooling fan HP 8663A SYNTHESIZED SIGNAL GENERATOR 8663A 6C Serial prefix 2424A and below Modification to improve low frequency loop performance and eliminate intermittent status errors 03 04 8663A 9 All serials Instructions for replacing the cooling fan HP 8671B SYNTHESIZED SIGNAL GENERATOR 8671B 2 Serial prefix 2703A and below Add mica insulators under diodes A3A12CR13 and A3A12CR14 8671B 03 All serials Preferred replacement for pre cision resistors 1ST QUARTER HP 8672A SYNTHESIZED SIGNAL GENERATOR 8672A 19 Serial prefix 2703A and below Add mica insulators under diodes A3A12CR13 and A3A12CR14 8672A 20 All serials Preferred replacement for pre cision resistors HP 8673B SYNTHESIZED SIGNAL GENERATOR 8673B 11 Serial prefix 2704A and below Add mica insulators under diodes A3A12CR13 and A3A12CR14 8673B 12 All serials Instructions for microwave signal path troubleshooting 8673B 13 Serial prefix 2640A through 2735A inclusive Modifications to improve power supply reliability 8673B 14 All serials Preferred replacement for pre cision resistors HP 8673C SYNTHESIZED SIGNAL GENERATOR 8673C 12 Serial prefix 2703A and below Add mica insulators under di
13. are used There are several models and styles available one of which is shown in Figure 4 If you don t use the template the amount of space the component takes up is a matter of educated guesswork For example if you are using a predrilled breadboard with the standard 0 100 inch spacing you can lay a selection of components with the leads already bent on the bread board and note how many holes are spanned For example a small preci sion resistor will span four or five holes Larger components naturally span more holes If you are using a solid breadboard without predrilled holes you are almost forced into using the template or using the graph paper to determine the size of your components The next step is to take all the component designators you have noted on the circuit and record them on a plain sheet of paper Place double sided adhesive tape on the back side of the paper under the numbers and set the sheet aside It will be used later as the components are placed on the breadboard In the next steps you need a way to transfer the cross reference points from the paper to the breadboard you are using The boards we use at Hewlett Packard are predrilled in a grid pattern on 0 100 inch centers see Figure 5 You can also buy this type of breadboard at any good elec tronics store Other common types of breadboard available are solid epoxy fiberglass or phenolic material with a sheet of copper ground
14. art the initial layout by arranging a rough sketch of the circuitry to determine the most practical placement of components and traces The next step is to adapt the sketch to a formal layout using a grid and a component template that will establish very accurate conductor paths component body outlines board outline and all other features The layout should be drawn as viewed from the component side of the printed circuit board The actual size board layout is based on a 0 100 grid WWW HPARCHIVE COM Figure 1 Sample circuit of inverting gain amplifier pattern however the preferred scale for paper layout is 2 1 The 2 1 scale is easy to accomplish using 0 200 grid graph paper some times called engineering notebook paper which is what I used for this article Mark your sheet of graph paper with sequential numbers across the top and down the side As you lay your circuit out on the graph paper each component lead solder point assumes a cross reference number These cross reference num bers will be used for transferring the layout from the paper to the bread board so you know where to place each component and the copper tape An example is shown in Figures 2 and 3 A standard component template is one of the most useful pieces of Hewlett Packard 1988 equipment you will use in designing breadboards It not only saves valu able time but also assures that stand ard component lead spacing and body sizes
15. er to drill If you are limited to a standard drill bit index with the smallest drill being a 60 0 040 inch you want to choose a size that will fit most of the components you are using If you LARS O7 Fe rerQoz Lesh erndeR INVERTING AMPLIFIER Figure 5 Typical PC board with holes predrilled on 0 100 grid WWW HPARCHIVE COM have access to smaller drills I find that 67 bits are the right size for IC sockets 65 for 1 14 watt resistors and diodes and 60 to 55 for larger leads If possible use a Dremel drill press to be sure the holes are verti cally aligned This method is also less likely to break the brittle carbide bits The 60 drill will be a little big but it will do for most of the compo nents including the printed circuit board sockets Drill the holes with the drill and then ream each hole with an 1 8 inch drill to undercut the copper away from the edge of the hole to keep the component lead from shorting to the ground plane see Figure 7 Any holes that are meant to be grounded can be left as is You can solder the lead directly to the ground plane Circuit Board Layout At this point if you were using the wire method you would begin loading the components on the board and wiring the connections However with copper tape you lay the tape first then place the components 1 2 Sz E es 2 P e le 9000 MYLAR 90008 Figure 6 Board layout showing copper tape in place Note my
16. he 45 guide line aids in finding cross reference numbers WWW HPARCHIVE COM 1ST QUARTER COMPONENT SIDE HE TEA 230 LCD 400 LCD E CKO6 CKO7 VIEW DIMENSIONS ARE ACTUAL SIZE 11 PATTERNS ARE 2X 12 1 SCALE Marking Predrilled Breadboards Put a strip of tape across the top and down the side of the board Use any type of tape that is easy to write on I use self sticking typewriter correc tion tape that is commonly found in the office supplies cabinet Mark the same sequential numbers on the breadboard so it matches the graph paper See the example in Figure 6 Marking Undrilled Breadboards Use the 0 100 or 0 200 inch graph paper and cut off small strips wide enough on which to write your num bers and as long as each edge of the board Tape them to all four edges of the board If you are using 0 200 inch paper divide each square in half The graph paper will provide you references in which to draw lines across the board allowing you to transfer your graph paper layout to the board When drilling the holes to mount the components you will find that the epoxy fiberglass board commonly called G 10 will dull ordinary drill 1ST QUARTER DISC z CK60 61 CMOS RC32 gle iW RCO7 DO Wee 1 4 pes ANSS AC20 1 2W G Pi HF T P C DESIGN TEMPLATE I 2X 2 1 SCALE 5 3367 bits very quickly so carbide bits are usually used for production work Phenolic boards are much easi
17. lar insulator where copper tape crosses BENCH BRIEFS 3 Cut off a piece of copper tape the same length as the board with a pair of scissors or X ACTO knife Next use the X ACTO knife and a good straight edge I use a small metal ruler and score the tape lengthwise in approximately 0 800 inch strips slightly smaller than the 0 100 grid pattern being careful not to cut through the adhesive backing tape The narrow copper strips will easily lift off the backing tape and lie perfectly across the holes in the breadboard Start at a convenient location on your circuit and lay one end of the tape over the cross reference number that matches your graph paper lay out Align the tape over the holes following the same path as the signal or Vcc line on the graph paper and press into place on the circuit board Where one piece of copper tape crosses another use a small piece of mylar tape as an insulator See Figure 6 Where the junction of two pieces of copper tape corners power taps con tinuations need to make good elec trical contact always solder the connection Do not rely on the adhesive Figure 7 Undercutting copper away from hole At each spot on the board where a component lead is to be soldered poke a hole through the tape from the tape side of the board using a plastic capped bulletin board pin In sert the permanent components such as IC and transistor sockets and solder them in place where they poke thr
18. odes A3A12CR13 and A3A12CR14 8673C 13 All serials Instructions for microwave signal path troubleshooting 8673C 14 Serial prefix 2640A through 2735A inclusive Modifications to improve power supply reliability 8673C 15 All serials Preferred replacement for pre cision resistors HP 8673D SYNTHESIZED SIGNAL GENERATOR 8673D 13 Serial prefix 2703A and below Add mica insulators under diodes A3A12CR13 and A3A12CR14 8673D 14 All serials Instructions for microwave signal path troubleshooting 8673D 15 Serial prefix 2640A through 2735 inclusive Modifications to improve power supply reliability 8673D 16 All serials Preferred replacement for pre cision resistors HP 8673E SYNTHESIZED SIGNAL GENERATOR 8673E 5 Serial prefix 2704A and below Add mica insulators under diodes A3A12CR13 and A3A12CR14 8673E 6 All serials Instructions for microwave signal path troubleshooting 8673E 07 Serial prefix 2640A through 2738A inclusive Modifications to improve power supply reliability 8673E 08 All serials Preferred replacement for pre cision resistors HP 8753A NETWORK ANALYZER 8753A 1 All serials Instructions for creating A9 EE PROM backup data 8753A 6 8757A 5 8753A serials 2625A and below 2625J and below 2713U and below and 8757A serials 2646A and below Modification to prevent dust accumulation on the CRT and glass filter 8753A 7A All serials A3 source A9 CPU A11 phaselock assembly compatibility matrix
19. ough the tape For those compo nents that you are going to hand select to fine tune the circuit use the printed circuit board sockets listed in Table 1 Enlarge the breadboard holes slightly from both sides of the board with the plastic capped pin If you drilled the holes with a 60 drill the socket will probably fit without en larging the hole Insert a socket in the hole it is easier to insert the Table 1 List of References Description Roll of Adhesive Backed Copperfoil Tape 1 Wide Roll of Adhesive Backed Copperfoil Tape 3 4 Wide Roll of Clear Mylar Tape With Yellow Adhesive Roll of Clear Mylar Tape With Clear Adhesive Terminal Test Point Printed Circuit Board Socket P C Design Template 2X 2 1 Scale The Design amp Drafting of Printed Circuits 4 BENCH BRIEFS HP P N 3M Scotch 1181 0460 0762 Permacel P 391 3M Scotch 8428 3M Scotch 850 0 038 Square 0 038 OD Socket Size 0 03 Bishop Graphics 3367 by Darryl Lindsey Pub by Bishop Graphics 0360 0535 1251 1556 WWW HPARCHIVE COM socket if you use a small pair of needle nose tweezers and press it home with the pin The socket has a closed end so it will not fill with solder or flux when you solder it in place Components that require fre quent replacing can now be easily inserted and removed without solder ing As you are inserting the compo nents cut the matching component
20. plane bonded to one side The following procedure will work equally well on both types of board The only difference is that the solid board requires more work in matching the reference points from the graph paper layout to the board and in drilling the holes and under cutting the copper ground plane away from the holes 2 BENCH BRIEFS FRONT SIDE PO LArouT YFP EP MNT nur 2 chee Iuran ER I 4 2 J 3 a y e a 4 F RERE ae 4 r EN im f 44 ro _ y k gt 4 J i IEN v7 l 1 jo fd 17 ES a 20 Ss 8i a BE 4 FESS Se a ee I J Lee i pare onl el ae T t i C 2 See ees aoe 1 bh wall Hh ee eee E Jala Figure 2 Initial graph paper layout of the PC board component side PE lay 00T BACK S19E PEELA ae seevnnn lt e wre Ty H ul 4 ee ee S ESN ee l z at e EA a EELS SNPAERSTET DRAGAN ARE keer e ee Se Figure 3 Initial graph paper layout of the PC board copper tape side T
21. r malfunction HP 1349A D DIGITAL DISPLAY 1349A D 5 All serials Modification to prevent high voltage oscillator malfunction HP 1650A 1651A LOGIC ANALYZER 1650A 1651A 1 1650A serials 2722A00535 and below 1651A serials 2723A00180 and below 220V fuse change to Slo Blo type 1650A 1651A 3 1650A serials 2722A00833 and below 1651A serials 2723A00313 and below Intensity adjustment cable modification HP 3235A E SWITCH TEST UNIT 3235A E 5 All serials HP 3235A Firmware Revisions 3235A E 6 3235A serials 2725A00626 and below 3235x serials 2725A00562 and below Additional RAM for HP 3235A processor HP 3488A SWITCH CONTROL UNIT 3488A 11B All serials Clarification on correct line fuses HP 3552A TRANSMISSION TEST SET 3552A 17 Serials 2615U06653 and below Preferred replacement for 12V battery packs HP 3562A DYNAMIC SIGNAL ANALYZER HP3562A 09 S Serial prefix 2738A and below Leakage current exceeds safety standard at line frequency of 400 Hz HP 3746A SELECTIVE LEVEL MEASURING SET 3746A 4A All serials Retrofit procedure for adding option 012 tracking generator 3746A 26 All serials Preferred replacement for A32Q22 dual FET 3746A 27 All serials Preferred replacement for diodes A5CR1 4 A10CR1 4 and special option H40 A410CR1 4 HP 3764A DIGITAL TRANSMISSION ANALYZER 3764A 22A Serials 2712U01594 and below Preferred replacement of A3 or A3 option 001 005 assembly WWW HPARCHIVE COM HP 3779C D PRIM
22. y 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 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 Library Subscription service 5951 6511 5951 6517 Contact your local HP Sales Office for ordering information o 6 BENCH BRIEFS HP 435B POWER METER 435B 3 All serials Preferred replacement for capacitors A4C6 and A4C30 HP 436A POWER METER 436A 12 All serials Preferred replacement for capac itors A2C4 and A2C6 HP 438A POWER METER 438A 6 All serials Preferred replacement for capacitors A4C13 and A4C15 HP 1340A DISPLAY 1340A 8 All serials Modification to prevent high voltage oscillator malfunction HP 1345A DIGITAL DISPLAY 1345A 8 All serials Modification to prevent high voltage oscillato
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HP Bench Briefs 1988..