HP Archive
Contents
1. 13114 11 Sanal prefix 1316A and below Passibulity of insufficent gain range after replacing A1U2 oF A3U2 VIZTIAIT DISPLAY VIB1IA C 3 1331A senal prefix 13194 and below 1331C senal prefix 1318A and below H V Oscillator double mockng and prelerred replacement for O5 IIIA C A AN senal prefixes Tips tor recognizing and identifying storage CAT symptoms 1420A TIME BASE 1420A 6 Senai pretix 964 and below Preferred replacement for Q101 1601A LOGIC STATE DISPLAY 1601A 1 Serial prefix 1338A and below Translonmer id 1601A 2 All senai prehxes Field repair ht 1703A OSCILLOSCOPE 17034 3 Sena prefix 1232A and below Improved low Irequency tnggenng 17079 OSCILLOSCOPE 1707B 2 Sanal pretix 12244 and below Improved low frequency tnggenng 17104 OSCILLOSCOPE 17104 1 Serial prefix 1302A and below Verncal Ampliher Protection Modification 1710A 2 Seria prefix 1316A and below CRT Burn Protection Modificabon 1820A TIME BASE 1820A 7 All senal prefixes Preferred replacement for R249 1820B TIME BASE PLUGIN 18208 3 All serial prefixes improved sweep length 1821A TIME BASE DELAY GENERATOR 1821A 9 For 1821A and 1821F All senal prefixes Preferred replacement for R223 and R444 1822A TIME BASE PLUG IN 1622A 3 All seral prefixes Preferred replacement for A1R59 and A1 R105 19154 VARIABLE TRANSITION TIME OUTPUT 1915A 12 Serial prefix 1207A and below Preferred replacement for ASO33 1922A NEGATIVE OUTPUT PLUG IN 1922A 1 Serial prefix 1209A and below Increas2. Fullerton CA 92631 Phone 714 870 1000 Should service be required please fill out the service card provided in the back of your operating manual and send the calcu lator to the nearest repair center For minicaiculator repair in countries C other than the U S please contact your nearest HP office Want to test your logic See page 5 Address Correction Requested Bulk Rate U S Postage PAID Menio Park Ca Permit No 317 C Printed in USA Aa ngnis are reserved Ho pan of Bench Boots may be reproduced WIOL The pasi wN consent of Ine Ediice The ggio may De telephoned at 415 492 1212 extenmon 15 urare MPARCHIVE com
3. divergence from normal however sub tle provides a valuable tool for trouble shooting Abercrombie M L Johnson The Ana tomy of Judgment London 1960 pp 94 108 ual for the miniature Probe Volt meter Brent previously spent 8 years at the HP Englewood Colo drado sales and Serice Office work ing both on the service bench and as part of the on site service force The streams and wooded areas of Colorado tit well with Brents inter ests of fishing and hiking He is ac uve in church work and also enjoys reading Brent is married and has two children For a 1 Hz bandwidth the theoretical background noise would be 174 dBm One practical implication of the above is that if you use a very narrow bandwidth and digital coding high or low signal you can pass intelli gence over long distances such as deep space with very low power battery operated transmitters This is just another reason why so much of our electronics is going digital Not only do we use digital tech niques for deep space communi cations but then we use digital enhancement techniques to inte grate out some of the noise which is random in nature and enhance the digital signal which is repetitive in nature George Stanley who is probably familiar fo many readers as the author of a book and videotape series on transistor basics 1s a regular contributor to Bench Briefs He is the Group Training Manager for HP s instrument producing di
4. 0 output connectors the difference amplifier ig not able to work cor rectly with different loads differ ent current when the generator is used as described above To avoid this bend in the waveform either use a 50 load for each channel or switch the attenuator of the unused open channel down to a lower range In conclusion if you ever use a 2 0 20 pulse generator watch for correct ermination Is may save a fot o l t t Th lot of 0 1 0 time looking for the problem l l 0 5 0 5 Guenter Schade has been with CAUSED HP tor six years and is currently a BEND 0 25 0 26 Customer Service Engineer at the HP NORM ECL NORM factory in Boeblingen West Germany This apparent error appears as a ices This job entails solving service related bend in the middle of the leading problems for electronic products edge on the 8008A Pulse Generator VERMIER Previously Guenter designed some of Similar symptoms may a ar with fhe unique electronic fixtures and lools other A VARRE KD used in the manufacturing of HP prod i O ucts at Boeblingen In addition to This strange behavior is caused by SETTING ON BOOBA spending a fot of time skiing he enjoys an incorrect impedance match and WHEN ERROR APPEARS table tennis 1 1700 OSCILLOSCOPE SERIES SERVICE 3 1710A MECHANICAL The signilicant mechanical aspects of the Model 1710A Oscilloscope are reviewed with emphasis on control groupings and how to remove most of the assemblies and the CRT Pe
5. Component Parts and Materials These are items that you might expect to find stocked at a local electronics distributor nems that might be used by any electronics manufacturer For example transistors ICs trans formers capacitors resistors nuts screws grommets tubes switches connectors batteries etc For com lie SERVICE INFORMATION FROM HEWLETT PACKARD JANUARY FEBRUARY 1974 The tips In this articie will help you to determine needed part numbers If you need assistance Identification experts such as Paul Gobin are available to help Please contact your local HP office paneni parts and materiais eight digit part numbers are used where the four digit prefix identifies the type of com ponent part or material and the tour digit suffix indicates the unique part Table 1 is a list of some of the more commonly used prefixes for compon ent parts Knowing this system has two benefits first having information about the part will give you clues about its part number For example if the parn you are replacing is an electrolytic capaci tor you know that the HP part number must begin with 0180 Second knowing the part number gives you helpful information about the part For example if you are working On a cir cuit with a transistor with pan number 1854 0037 you know that this transis tor is an NPN made out of silicon Therefore you can expect to see about 0 6V across a forward biased base emitter j
6. and below Change of overload araail zener 7100 SERIES STRIP CHAAT RECORDERS 7123A8 74 Sena prefix por to 1319A Disposable Pen Kits Supersedes 7123A B 4 6 7 7SSOAB 1 7131A B 1 Senal prefix 1312A and below Improve rehabiity of instrument grounding 7 434 B 3A Desposable Pen Kits Supersedes T143A 8 1 2 3 7260 SERIES OPTICAL MAAK READEA 72604 1 All senals Recommended spare parts 7260A 2 All senais Improved read head sensitivity 726 A 2 All senals Improved read head sensitivity 7402A OSCILLOGRAPHIC RECORDER 7402A 2 Senai numbers 1342400556 through 1342400600 Preventing a possible short in the Power supply regulator PCS 7414A 7418A THERMAL RECORDERS 7414A 2 All senal prefixes installation of additional channels 7418A 2 All senai prefixes instaflation of additonal channeis 7754A 77584 THERMAL RECORDERS 77544 2 All seral prefixes Installation of additional channets 7758A 2 All senal prefixes insialtabon of additonal channels 8000A SERIES PULSE GENERATORS 003A 3 Serial prefix 1233A and betew Line inter ference in the Gates mode 8007A48 2 All senal prefixes Rate jitter 8012A 3 Serial prefix 12284 and beiow Pretwred replacement for A2R21 A2R22 8407 NETWORK ANALYZER 8407A 5 Senal prefix 1144A and below Modification for improved operation when used on 220v line voltage 8654A SIGNAL GENERATOR B654A 2 Senal prefix 13274 and below Elimination of fine tuning creep 8660A SYNTHESIZED SIGNAL GENERATOR B660A 7A S
7. distribution center nearest you European customers should mail it to this address Hewlett Packard S A Central Mailing Department P O Box 7550 Freeport Building SCHIPHOL Centrum The Netherlands For the U S and efsewhere mail it to Hewlett Packard Company 195 Page Mill Road Palo Alto California 94306 GENERAL MSO Autognp Installation and cleaning procedure supersedes M48 and aulognp M51 All X Y Recorders and graphic plotters Mylar test gnds not recommended A M53 Equipment necessary lo Cabbrale and check per liormance of HP Real Time Oscilloscopes super Sedes errongousiy Numbered SN M 51 1414 STORAGE OSCILLOSCOPE 1414 S 19 All senal prefixes CRT Neck Pin Location 141T SPECTAUM ANALYZER NSPLAY SECTION 141T 3 All serial prefixes Fast and Standard Mode Adusiments using spectrum analyzer plug ins 141T 4 A sonal prefixes Cooling lan modiicaton 236A TELEPHONE TEST OSCILLATOR 236AVAH 1 Telephone Tes Oscillator Model 236A serials 1107404450 and below Model 236AH senals 1107404565 and below Model KS 19953 L4 all senals Modification io mprov amplitude flat ness above 100 kHz 4038 AC YOLTMETEA 4038 5 Seriais 523 05300 and below Modification to replace germamum trangesiors with siboon transs tors 435A POWER METER 4354 1 Serial prefix 1234A and below Modificaton for long input cabies a 4894 MICROWAVE AMPLIFIER 489A 6 All serial prefixes Ingiailanon of improved TAT and general updatin
8. solved with the clues given so don t give up easily Good Luck One day five young aspiring HP techni cians were finishing a day of repair work One was Japanese another was ltatian another was German an other was English and another was American If you think that ihat is strange read on They decided to have a race to the local bar to share a drink and extend their best wishes for a prosperous New Year Now this was not an ordinary group of service personne because their cars were a Datsun 240Z Volkswagen Superbug Fiat 850 Triumph TA4 and a 56 Chev with one bald tire One of the above cars was marked 1 an other marked 2 another 3 another 4 and another was 5 it also seems that they were racing enthu siasts From the information in the clues be low answer these questions 1 Who finished first in the race 2 What car was he driving 3 What number was labeled on it Similarly determine the same for the second third founh and last place people That is fill in the table MAGNETIC TAPE DISCONTINUED by Vern Hudson Some versions of the 3960A Instru mentation Tape Recorders such as the 3960G E14 are equalized for 3M Type 203 Audio Tape Others such as the 3960G E51 are equalized for 3M Type 150 Audio Tape 3M has recently announced the discontinuance of Types 150 and 203 tapes Also they do not have a direct replacement for Here s what you need to solve the problem a No drive
9. 123U and below Serial num bers 1112A00135 and below Installanon of 37204 Interface Modificaton kit 03721 70098 NEW SERVICE NOTES 3730A UP DOWN CONVERTER 37304 1 Serials below 122000131 Reduction of spurious signals at I F Output 3960 SERIES INSTRUMENTATION TAPE RECOADERS 3960 98 Ai senal prefixes Recommended spare parts 3960 10A All senal prefixes Operator maintenance routine 3960 11A All sanal prefixes Preventative main Jenance rouline 3960 14A All senal prefixes Procedure for replace ment of Capstan Motor Tachometer Lamp Assembly 3960 15A All serial prefixes Replacement of Cap stan Molor Assembbes 3960 17 Serial prefix 1332A and above improved reel cover hir 3960 18 All serial prefixes Optional rewiring of E O T switches to senes 3960 19 Senal prefix 13304A ang above Improved brake adjusiment procedure 3960 20 Senal prefix 1344A and above supersedes 3960 134 New configuration cross reference 3960A 21 All serial prefixes Access door adjust ment procedure 3960A 22 Al senal prefixes Recordireproduce head adjustment procedure 3960A 23 Senal prefix 1330A and below Improved low speed flutter performance 42044 DIGITAL OSCILLATOR 42044 1 Serials 124003140 and below Recom mended replacement for Q3 4270A CAPACITANCE 8AIDGE 4270A 7 Serial prefix with J Soluteon for oscillabon on 1 MHz range 5306A MULTIMETER 53064 1 Senais below 1248A00560 Aulo zero stabdity 5306A 2 Senais Deiow 1324400160 improvement o
10. HP Archive This vintage Hewlett Packard document was preserved and distributed by www hparchive com Please visit us on the web On line curator Glenn Robb This document is for FREE distribution only CLUES TO HELP DETERMINE THE HP PART NUMBER OF A REPLACEMENT PART by Rod Dinkins Have you ever searched through the parts list in an Operating and Service Manual trying to determine the HP part number of a needed replacement If so there have probabiy been times when it was difficult to determine the desired number It is not uncommon to find several part descriptions that seem to apply to the part that you need How do you determine which is the cor rect number One way is to cal your lo cal HP office An even faster method though is to use the clues given by the part number of each parn If you frequently use HP parts lists you have probably noticed that similar parts have similar part numbers That is there appears to be some pattern in the numbering system Although there are variations and exceptions the or ganization of the part numbering sys tem can be broken down into three ma jor classifications 1 Components and materials 2 General usage parts and 3 Specific instrument parts A knowledge of the basic struc jure of the part numbering system sim plifies identification of part types or part numbers In this article we ll exa mine each classification and show some typical examples
11. R S8869A 1 Serial prefixes 1321 through 1406 Moc fication 10 prevent intermittent Diagnostic Test Program failures 10525T LOGIC PROBE 10525T 1 Series 1120A Soluvon for O latching and first pulse non delection 11146A INTERFACE KIT 11146A 1 Al serials Improvements in program lapes 12723A MINIVEATEA SERVICE KIT 12723A 18 All senais List of kit components for servicing the 2310C and 2312A Subsystems 12770A COUPLER SERIAL LO KIT 12770A 1 All serials Modification to prevent sysiem lock up when used with an HP 34808 and HP 2570A coupler with Pin Board Programmar 127724 COUPLEA MODEM LO KIT 12770A 1 AJI serials Modification to prevent system lock up when used with an HP 34808 and HP 2570A Coupler with Pin Board Programmer 28023 POWER METER SUBSYSTEM 28023B 1A All serials Recommended spare parts for inree levels of system repair 28037A DIGITAL VOLTMETER SU SYSTEM 28037A 1 All senais Recommended spare parts for three levels of syst m repar 28038A FREQUENCY COUNTER SUBSYSTEM 28038A 1 All senals Recommended spare parts for three levels of sysiem repar 28048A SYNTHESIZER SUBSYSTEM 2B048A 1 All seriais Recommended spare parts lor three levels of system repair 28084A WAVEFORM ANALYZER SUBSYSTEM 280844 1 All seriais AMC 1010 1011 Calbratron and maintenance procedures 2B084A4 2 All serials Recommended spare parts for modular and component repair 34740A DISPLAY SYSTEM 34740A U 5000 Serials 1250U00340 To ease cab branon of Display Ass
12. able 2 Sheet Metal 5000 to 5019 Machined 5020 to 5039 5040 to 5059 5060 to 50792 5080 to 5099 Molded Assemblies Components As an example of use assume you have a broken guide used for printed circuit board suppor Upon examining the part you determine that it s likely PREFIX COMPONENT PAAT MATERIAL Connectors non RF and related parts Bearings and Bushings Batteries Monolithic Digital Integrated Circuits Monolithic Linear Integrated Circuits Transistors Germanium PNP Transistors Germanium NPN Transistors Silicon PNP Transistors Silicon NPN Field Effect Transistors Thyristors and SCR s 1900 thru 1912 Diodes 1920 thru 1952 Vacuum Tubes 1990 Semiconductor Photosensitive and Light Emitting Diodes 2110 Fuses 2140 Lamps 3100 thru 3106 Switches 8120 Cables 9100 Filters and Transformers to be used in many instruments and that it is a plastic molded part From this and the previous listing its very likely that the PC guide will have the prefix of 5040 to 5059 This will help to locate the correct part in the table of replaceable parts The part number for acommonly used PC guide is 5040 0170 An example of a component used in several instruments is power splitter 5088 7003 Thus if the part to be replaced appears to be one made by HP and used in many HP products the part number probably has eight dig its and the first digit is a 5 The third digit will indicate additional in
13. ce shorting problem 1208AH11 6 AJ senal prefixes Tips lor recogninng and identifying storage CRT symptoms 121548 1 All senal prefixes Preferred replacement for AGQ4 121548 2 All senal prefixes Nut adapter for Intensity Pot 1217A8 2 All senal prefixes Preferred repiacement for ABOS 1217A 8 3 All senal prefixes Nut adapter for Intensity Pot 1300A X Y DISPLAY MONITOR 1300A 9 All serial prefxes Preterred replacement for HV Oscillator Transestor 1300A H82 2A Serial prefix 1204A and below Prater red replacement for A5 Recommended Modification to A5 1300A HB2 3 Senal pretx 1204A and below Prefer red replacements tor A6 AGF1 and AGF4 13084 EIGHT CHANNEL MONITOR 1308A 7 Senai prefix 1222A and below Preferred replacement lor A9 ASF 1 and A9F4 1308A 8 All senal prefixes Preferred replacement for H Y Osailaior Transestor 1309A X Y MONITOR 1309A 7 Senai prefix 12524 and below Preferred replacements for A9 AQF1 and ASF4 1309A 8 All sonal prefixes Prelerred replacement to HV Osallator Transistor 1310A COMPUTER GRAPHIC DISPLAY 1310A 9 Sena prefix 1316A only Preferred replace ment tor AS 1310A4 10 All senal pretixes Stock numbers for or mask assembbes 13104 11 Seral prefix 13164 and below Posabulity of insuthoen gan range afler replaang AiU2 or A3U2 t311A COMPUTER GAAPHIC DISPLAY 13114 9 Senal prehx 13164 only Preferred replace ment for A5 1311A 10 All senal prefixes Stock numbers for order ing mask assembles
14. dreds of HP products If so it will probably have an eight digit pan number beginning with a5 3 is this part manufactured by HP for use in one or a few HP products If SO It will probably have a ten digit part number and the rst five digilis are related to the product s model number If the second or third category is chosen we nex ask if ihe part is a made out of sheet metal b machined c motded d an assembly e a component What can you determine about the de sired part number An examination of the paper tray for this instrument leads us to the conclu sion that the part is unique enough that it probably was designed by HP for only this HP product Therefore it has a ten digit part number and the first five digits will be the product mod el number 05055 NNNNN Further ex amination reveals a curved shape indi cating that the item is molded There fore the first digit in the suffix is a 4 sO our number is narrowed to 05055 4NNNN Let s assume that the service manual lists five parts with descriptions that might be what we want such as paper holder paper support etc These are a 05055 00005 b 05055 40001 c 05055 00004 d 05055 20005 e 5060 0099 Which part is the one desired We con cluded our part was used only in this in strument Therefore answer e can be ruled out The desired part is also molded and answer b 1s the only one that fits this description Therefore 05055 40001
15. ed ngeume capability 1925A WORO GENERATOA 1925A 3 Senal prefix 1232A and below Word count errors 2761 OPTICAL MARK READER 276 A 12 2761B 6 2781A prefix 1214 and below 2761B prefix 1216 and below All Opbons Preven hon of nigh failure rate of front idle wheels 2930A LOW LEVEL MULTIPLEXER 29304 4 Seriais 1118A00141 Io 1118A00160 Mod ficaton to preven erroneous overload 3310A FUNCTION GENERATOR 3310A 4 Senal numbers 920 0065 and below Re placement of A1CR21 and A1CR22 3403C TAUE AMS VOLTMETER 3403C 1 All senais Improving lght emitting dode annunaator 34594 DIGITAL VOLTMETER 3459A 11A All serials Replacement oven assembly 34604 8 DIGITAL VOLTMETER 23460A 10 34608 10 Al senais Replacement oven assembly 3462A DIGITAL VOLYMETER 34624 3 All senals Replacement oven assembly 3524A TRANSPORT 3524A 3 All senais Replacement of dashpot 1520 0073 3525A TRANSFORT 3525A 3 All senais Replacement of dashpot 1520 0073 3526A TRANSPORT 3526A 3 All senais Replacement ol dashpot 1520 0073 3527A TRANSPORT 3527A 3 All senals Replacement of dashpot 1520 0073 3701Z TRANSMITTER 3701Z All senals Field Replacement of lan 37012Z 2 Seriais below 1145001451 Reduction of drop in B B level from 6 8 Sweep output under certain emaronmental condibons 37028 IF B 8 RECEIVER 37028 1 Senats beiow 1136000124 Removal of crossiaik between Y and YZ Iraces 27028 2 All senals Elimination of noise on upper ace when BB cakbeabo
16. embly 86242A 86250A 8 AF PLUG INS 86242A 1 86250A B 1 B6342A SEIS0A 2 86351A 1 BBISZ2A 1 AJ senais YIG oscillator replacement assembbes 86342A 86350A 86351A 86352A OSCILLATOR MODULES 862424 1 06250AB 1 86342 1 B6350A 2 86351A 1 B6352A 1 Al senais YIG oscillator replacement assemblies NAME ORDER FORM COMPANY NAME Please print your name ond oddress clearly This will be used as a shipping label res ADDRESS CITY E Check here to receive o quahfication form for a free subscription to Bench Briefs STATE ZIP fe pees es eee Ge eee gee ee a Please y check below the numbers of any desired service notes M50 Z 1217A G 2 2R0A4 q 37304 1 7123 A B 7 A M51 1217A 8 3 R1044 3960 9B 1 7120A B 1 7131AVB 1 M53 1300A 9 3403C 1 3960 104 1 7143AB 3A4 141 US 19 T 1300A H82 2A J459A 11A 3960 1 1A 1 7260A t 141T3 7 1300A H82 3 34604 1034608 10 m 3960 14A 7260A 2 1417 4 1309A 7 346243 3960 154 72B1A 2 236 A AH 130848 952443 2 3960 17 7402A 2 A j 7 3 C 4038 5 1309A 5254 3 3360 18 7414A 2 11146A 1 435A 1 1309A4 8 35264 3 11 4960 19 1 7418 A 2 12723 A 18 49986 1340A 9 3527A3 3960 20 TISAA 2 12770A 1 491C 6 gt 1310 10 37012 1 3960A 21 77584 2 28023B t A 651B U 1000 3104 11 37012 2 i 39604 22 8003 A3 290974 1 74187 13114 9 37028 1 3960A 23 8007A B 2 Z 28038A 4 74188 1341A 10 3702B 2 42044 1 80124 3 29048 A 1 1106A 14 SBTTAAN Z 370284 4270A 7 BA07A 5 280844 1 B 5 4
17. enaj prefixes 1246A and below Mod ficabon to improve HF Section acyusiment range BEH0A 15 Senal prefixes 1317A and below Improved intertace connection bracket B6604 16 A serials Internal crystal oscultator ingial labon 8660A 17 Senai prefixes 1339A and below N3 osalla tor adjustment impx ovement 86608 SYNTHESIZED SIGNAL GENERATOR 86608 12 All senals Internal crystal oscillator im Stallatron 86808 13 Senal prefixes 1310A and below Improved HF section adjpusiment range B6608 14 Senal prefixes 1339A and below N3 osal lator adjustment improvement 86608 15 Seral prefixes 1318A ans below Improved interface Connection bracket 94008 001 MODULAR SWITCH 94008 001 1 All seriaia Fuse connechon for 230 Vac Operabhon AMC 1000 PROGRAMMABLE WAVEFORM ANALYZER OEM 9500 SYSTEM AMC 1000 14 Al serais Modification tor improved feliability of the A S2 high volage board WAVETEK MODEL 157 S 140 PROGRAMMABLE WAVEFORM SYNTHESE ER OEM 9500 SYSTEM Wavelek 157 S 140 1 All serials Modification to allow acyustability lo ihe unatienuated output 95400 YRANSCEIVEAR TEST SYSTEM 9540B D 1 All senais Recommended spare parts lor three levels of system repair 9551D INSTRUMENT CALIBRATION SYSTEM 8551B D 1 All serials Recommended spare parts for three levels of system repair 9862A CALCULATOR X Y PLOTTER G862A 2 Serial prefix 1308 Options 20 and 30 Modification 10 prevent improper calculator opera bon caused by Plotter turn otf 9869A LO EXPANDE
18. formation about the item Specific Instrument Parts These are parts manufactured by HP for use in a particular HP instrument or series of instruments These parts have ten digit part numbers the prefix is the model number of the instrument and the suffix indicates the type of part Table 3 is a list of suffixes com monly used As an example assume that you are looking for the part number for the main chassis for Model 5340A Since this is likely to be used only in the 5340A and because it s a sheet metal part you will conclude the num ber will most likely be 05340 ONNNN After scanning the parts list under chassis parts you would find the part number s 05340 00003 Some clarification of the above ca tegories may be appropriate Sheet Metal includes items that are stamped out of sheet metal folded if necessary and perhaps painted Many front panel parts fall into this category Also included are items made out of sheets of other material such as an insulator made from a sheet of bakelite A part is assigned a 2NNNN suffix when the last operation performed is a machining operation such as drilling a Table 3 Sheet Metal Machined Molded Assembly Component Documentation and special parts P N SUFFIX gt PARTS IDENTIFICATION hole Other machining operations in clude milling threading and lathing A molded part can be recognized by the unique shape that results from a mots A pa
19. g Supersedes ali previous sevice Notes 4931C MICROWAVE AMPLIFIER 491C 6 All senai prefixes Installabon ol improved TWT and general updating Supersedes all previous Service Noles 6518 TEST OSCILLATOR 6516 U 1000 Senals 1201U00925 and below Power Transsior Replacement 7418 DIFFERENTIAL VOLTMETER 7418 7 All senais Replacement o resistor in AC probe 741B 8 All senals Padding capacitors used for AC probe replacement 1106A TUNNEL DIODE 1106A 1A All senal prefixes Repair Pobcy super sedes 1106A 1 1200A SERIES OSCILLOSCOPE 1200AB 5 All senal prefixes Preferred replacement for ACK 1200A4 B 6 All senal prefixes Nut adapter tor Intensily Pat 12014 8 5 All senal prefixes Preferred replacemen for AGDA 12014 B8 6 All senal prefixes Nul adapter for intensity Pot 1202A B8 2 AH senal prefixes Preterred replacement tor AGO 1202A B 3 All senal prefixes Nut adapter lor Intensity Pat 120546 2 AN senal pretixes Preferred replacement lor AGH 1205AB 3 All senal prefixes Nut adapter for Intensity Pot 120648 2 All sena prefixes Preferred 1eplacement tor AGOA 1206A B 3 All serial prefixes Nut adapter for Intensity Pot 1207A8 5 All senal prefixes Preferred replacement lor A6QS4 12074 8 6 All senal prefixes Nui adapter lor intensity Pot 1208A H11 4 Senal prefix 1306A and below High vol lage osallator dovble moding and preferred r placement Ior ABCR 1208A H11 5 Serial prefix 1330A and below Poten lial fa
20. hooting Procedure in HP Manuals T Always g Usually Sometimes T Seldom T Never 2 Ofthe time you spend each month repairing all makes of electronic instruments HP repairs plus al other repairs what percentage 15 Spenl repairing HP products 10 or fess 10 40 40 70 70 100 3 Have you ever used a Troubleshooting Tree in an HP manual Cl Yes J No 4 Have you ever used a Troubleshooting Chart in an HP manual y Yes A No questions continued on back cover EXPANDED REPAIR OFFICES 5 Have you ever used a Talking Schematic in an HP manual O Yes O No 6 Which of these do you prefer O Troubleshooting Tree O Troubleshooting Chart Any comments 7 On the average how would you rate the quality of HP Troubleshooting Procedures O Extremely Good O Very Good UO Good O Equally Good amp Bad Thanks for your cooperation O Talking Schematic O Very Bad O Extremely Bad HP 35 80 45 CALCULATOR REPAIRS Owners of miniature calculators in the U S may be interested to know that there are now six additional HP repair offices that handle minicalculator repairs They ae W120 Century Road Paramus New Jersey 07652 Phone 201 265 5000 5500 W Howard Street Skokie IL 60076 Phone 312 677 0400 333 Logue Avenue Mountain View CA 94040 Phone 415 968 9200 P O Box 28234 Alianta GA 30328 Phone 404 436 6181 201 E Arapaho Road Richardson TX 75080 Phone 214 231 6101 1430 E Orangethorpe
21. is not specified but the 1 milliwatt of levelled output is specified Common sense might dictate that 244 times the output should be more than enough power to ensure levelling Any serviceman would be helpless to re pair this instrument until he knew what the normal input power should be If you are stuck in a circuit that dis plays unreasonable symptoms it is possible that you have made invalid assumptions about what is normal for the circuit Many times it will clear things up to make careful measure ments throughout the circuit note them then call the nearest specialist to find out which measurements are abnormal To summarize it appears that within specifications ts a good start at defin ing normal operation for electronic gear Our definition however needs expansion to include usual perfor mance and unspecified conditions for operation to make it really useful An orderly approach to mechanical in THE ORIGIN OF 114 dBm by George Stanley Many of you who work in radar communications or receiver testing are familiar with the expression 114 dBm as the residual back ground noise level that is present when using a 1 MHz bandwidth This noise level is derived from the expression KTB where K is Boltzman s constant which is 1 38 x 1023 Oules T is the noise temperature in degrees Kelvin of the device being measured B is the bandwidth of the sys tem in Hz For a 20 C environme
22. is the part number of this paper tray Some variations on this part number system may be noticed in some divi sions and in some countnes Also pre vious part numbering methods were used that did not incorporate the fea tures of the present systern The pre vious system used numbers such as 560A 37AK Also Some firms acquired by HP had their own methods of as signing numbers Many of these numbers are still im use today There fore the techniques presented above will not help you 100 of the time buta great amount Investing a few minutes learning the system pays big rewards Try it it works Rod Dinkins iS a writing Super visor at the Santa Clara Calitornia Division of HP His responsibilities include all the Operating and Ser vice Manuals for instruments manu factured there His outside interests are many including photography bridge and building model cars He i married and has two boys PULSE GENERATOR WAVEFORM ERROR by Gunter Schade If you work with pulse generators or repair ihem you may have noted a special effect on some instruments which raises the question to service people and customers is this an error or not appears when each channel is set to full amplitude of about 4V but when only one channel is used and therefore terminated by 502 while the other unused channe is not terminated Since the output stage is a difference amplifier and both collectors are connected to the 4 0 4
23. l ineanty 5340A FREQUENCY COUNTEA 5340A 5 All seriais Recommended replacement for IC 1820 0753 1820 1179 5340A 6 All senais Adjustment to correct intermittent display ol all zeros or prolonged acquisition time with high level Odbm 6 to 11 GHz input signal 5354A FREQUENCY CONVERTER 5354A 1 Serials 1332A00051 through 1332400068 Mandatory lest point for adjustment of Schmatt Tngger Assy A15 3604 COMPUTING COUNTER 5360A 5 Serials 1136A00900 and below Recom mended new AB board to increase rekabiity 5379A TIME INTERVAL PLUG IN 53794 1 Serials below 1232A00900 Improved arming stabelity 5505A LASER DISPLAY 5505A 1 Serial prefix 1312A and below Modilication to eliminate unstable display 8130A DIGITAL VOLTAGE SOURCE 6130A4 4 All senals Modificabon to remove nose Susceptibility on programming ines 61308 INGITAL VOLTAGE SOURCE 6130B 6 AR senals Modification to remove nose Susceptibility on programming knes 61318 DIGITAL VOLTAGE SOURCE 61318 5 All seriais Modificaton to remove nase susceptibility On programrrang ines 6450 SERIES POWIER SUPPLIES 6450A 1 64534 1 6456B 1 6459A Unis produced before October 1973 Modification fo operale from unbalanced d lta source 70044 8 X Y RECORDERS 70048 5 All senalg Change of overload orcun thyristor 70048 6 Senai prefix 928A through 1240A Change of ovearioad Circuit zener 7044A X Y RECORDERS 70344 6 Al senais Change of overioad arcun thyristor 7TOQ4A 7 Serial prefix 1332A
24. mine some practical definitions of normality Normal could be thought of as with in specifications H is possible how ever to find deviations from normal within specifications For instance an instrument that functions properly may show some indication of possible failure six months hence Such indica tions may be minor yet stem from ma jor causes A drop of oil on the chassis ot an instrument could be from a defec tive capacitor that will explode within weeks or perhaps hours The drop of oil and similar even more subtle indi catons can be caught if you will pre pare a checklist of things to look for Add to the list as you think of new en tries such as a drop of oil a cracked p c board a loose ground etc The Should this screw be this long la this normat list will ultimately cover a page or so but will still require only a few mo ments to check out Normal could be thought of as usual or mean performance Is a tiny amount of jerk in the transmission of a recorder acceptable The paper moves at the specified speed but from experience you know that the paper should move smoothly Inspec tion will reveal a jerking clutch Had it locked it could have done hundreds of dollars worth of damage Smooth per formance is usual but not specified Take a moment every so often while troubleshooting or testing to deliber ately try to sense how the machine is running Touch the paper feed
25. n l The Chev finished last m The driver of 2 was older than the American but younger than the driver of the Volks wagen n The American was not driving Car 4 O The Englisnman finished ahead of inese three dif ferent cars the Fiat the Chevrolet and the car labeled 1 Nationality of Driver on Car nounced as soon as it is available All other standard versions of the 3960A series require 3M 951 tape HP P N 9162 0006 Vern Hudson is a Service Engineer for Re corders and Piotters at the San Diego Calitornta Division of HP Service En gineers are product experts that provide technical assistance to the HP Field Ser vice Organization Vern also contributed an article on tape recorders that rnay be of interest in the November December 1973 issue of Bench Briefs SEAVICE TIP IS THIS NORMAL by Brent Hellund Itis in poor taste these days 10 speak of normal Anthropoligists sociologists and psychologists have about given up trying to define normal It is even harder than it may seem to define nor mal as it applies to machines On the other hand one of the virtues of a deeply experienced serviceman is an almost instinctive feel for deviations from normal operation in a circuit So it s to your great advantage to devise a strategy that helps you to better deter mine what is normal for any particular instrument How does normal apply to electronic gear Let s exa
26. n ts on 37026 3 AJl senals Preferred replacement for A4 CR3 CR4 CAS CR6 anc CA7 3702B4 Seriais below 1242U00251 Improvement in Marker Display 37028 5 Aji senais Preferred replacement lor A2 C35 37028 6 All serials Preferred replacement for R11 37028 7 All senais Preferred replacement for 1 F Attenuator 3702B 8 All seriats Preferred replacement of AGOT and AGQ2 37028 9 Senais below 1205000191 Field replace ment of A4 Assembly 37028 10 Senals below 2OSU00191 Field repiace ment of A2 Assembly 3702B 11 Serials below 205U0019 Reduction of X posihon offset when changing X gain 37028 12 Senais 1205U00239 1205U00240 1205U00248 1245U00256 1245U00258 124500260 1245U00262 1245U00263 and above Field replacement of AG Assembly 3702Z DEMODULATOR DISPLAY 3702Z 1 All senais Fisid replacement lan 37022 2 All senals Preferred replacement for van ssstors AJQ3 A405 and A406 3704B GROUP DELAY DETECTOR 37036 14 AN senals Preferred replacement tor AIMC S MEZ MC3 MC4 amp MCS 3705A DIFFERENTIAL PHASE DETEGTOR 3705A 1 All senais Preferred replacement for AIMC1 MC2 MCI MOa amp MCS 37164 B 5 GENERATOR 3716A 1 Serials below 1136000136 Reduction of phase npple on differential phase display 3721A CORRELATOR 3721A 7 All seriais installation of the tape punch imertace optons 02 and 022 3721A 8 Senais 1103U00310 and below except 00297 thru 00305 Improved interpolation lacilty 3721A4 9 Senal prefix 1
27. nt K is 273 20 293 K Jf bandwidth is 1 MHz then KTB 1 38x1023 jones x 293 K x106 e i ht joules sec But 1 joule equals 1 watt sec SERVICE TIP spection deliberate sensitivily to the peculiarities of an instrument and a readiness to seek help will reduce down lime and minimize re repairs One of the most important of mainten ance procedures is to take notes preferably in the instrument service manual that describe normal opera tion for the instrument at hand Any des Brent Helland is currently a tech nical writer with the Loveland Color ado instrument Division of HP His lat est project was the operating man Therefore KTB 1 38 x 293 x 107 4 04 x 10 5 watts 4 04 x 1012 m watts The decibel dB is often used to express the ratio of a power level Py to some reference power The term dBm is used when the refer ence power level is 1mw Thus dBm 10 logs t Px any watt sec sec nou See the April 1973 fase ad Bench Briefs Let us convert KTB to dBm Absolute Power Level 10 10919 4 04 x 10 mw Imw 10 logy 4 04 x 10 7 10 logis 4 04 logy 10 10 logy 4 04 12 logy 10 10 0 6 12 1 10 11 4 114 dBm For a 10 KHz bandwidth the theo retical background noise would be 134 dBm For a 100 Hz bandwidth the theo retical background noise would be 154 dBm cription of normal operation will help you work more efficiently since any
28. r 1200A B 5 1331403 37028 53064 1 8654 A 2 26084 A 2 1200A B 6 133144 37025 5 5S806A 2 B660A 7A 34740A U 1000 1201A 8 5 T 1420A4 3702B4 5404 5 86604 15 86242 A 1 86250A B 1 1201AB 6 gt 1601 A 1 1 3702B 7 SHO0A6 86604 16 86342A 1 863504 2 1202A 8 2 4601 A 2 37028 8 5354 A T 8660A 17 86351A 1 863524 4 1202A 83 1700A 3 37028 9 SI60A 5 i 86508 12 1205A 8 2 17078 2 37028 10 53794 1 _ 86008 3 i gt 12054843 17104 1 3702B 11 I 55054 1 86608 14 1206A B 2 3 17104 2 3702B 12 6130A4 86608 15 12064 B 3 8204 7 3702Z 1 7 613086 94008 001 1 120748 5 gt 1820843 37022 2 61318 5 AMC 1000 1 A 1207A B 6 1821A 9 370QB 1A gt BA50A 1 6453A 1 1 Wavetek 157 S 140 1 1208 A H11 4 182243 _ 37054 1 6456A 1 6456B 1 9540B 0 1 64594A 1 208 A H31 5 1915A 12 2 37164 1 53 95518 D 1 V20B A H11 6 19224 1 37214 7 7004 8 5 G862A 2 1215A B 1 192543 372148 700408 i 9889 1 D 1215A 8B 2 gt 2761A 12 2761B 6 3721A 9 703448 T 105257 1 5 7034A 7 ALONG THIS 53 Would you take a moment to answer a few questions jn you repair HP products we would like your opinion Please leave blank if you do not repair HP products CUT Hewlett Packard attempts to provide service manuals that are the best available One area of the service manual that generally gets a lot of emphasis is the Troubleshooting Procedure We would appreciate your comments on the various approaches used vs 1 Do you use the Troubles
29. r nad the same nationality as the country of manufacture of his car Japanese did not drive the Oatsun Italian did not drive the Fiat elc b The Datsun finished be hind the Fiat not neces sanly directly behing C The dnver of ina Chev had to stop to change a flat tire The Italian won the race Car 3 did not finish in the first two places f The Tnumph had a bro ken windshield wiper 9 No car finished the race in a place that corres ponds to its number Car 1 did not finish ist Car 2 did not finish 2nd ste Make of Car 2nd Place 4th Piace these two audio tapes which would meet all specifications of these special versions Extensive testing at San Die go Division nas vented that a direct re placement for the 203 tape is the Am pex Type 641 tape The 3960A series recorders equalized for the 203 tape will meet all specifications when using the 641 tape and in fact the 641 is be ing supplied with the 3960 s which pre viously used 203 tapes Far repiace ment purposes the 641 is available under HP P N 9162 0060 A repiace ment for the 150 tape is being tested and the replacement will be an Number labeted h The dnver in Car 3 worked for HP two years longer ihan the driver of the Fiat l The American is 6 feet talland weighs 270 pounds J The driver ihat finished in 4th place has a mother in law who is big ger than the American kK The Volkswagen was painted gree
30. roller Should this recorder have such a wide trace Is this normal does ii move smoothly Look at the display is an LED too dim Listen for a whine or clunk or rattle Normal could be thought of as being efficient enough and not requiring remedial action For example a ra dio operator may continue to take mes sages from his receiver despite noise or poor fidelity and say that the re ceiver operates normally until it re quires remedial action because of a to tal failure no reception at all One user s oscillographic recorder yielded more power line frequency in terference when grounded than when floating The user considered this pe culiarity to be normal for this instru ment so he left it floating and tolerated the smaller amount of hum Investiga tion revealed that this ground was an ungrounded window grating that was twenty feet from a high voltage power line Recordings became free of perceptible hum when the recorder chassis was properly grounded When an operator claims that his gear worked normally until its recent mal function ask a few questions Find out just what he means by normal His answer may save valuable trouble shooting time Normal could be thought of as an unspecified condition that is neces sary for proper instrument function If 22 milliwatts of R F power into the regulator is necessary to produce O a levelled output 214 won t do The 242 milliwatts
31. rsonnel who have to ser vice the vertical attenuators or remove the horizontal module or CRT of the 1710A will find this program very useful HP stock number 90030__ 797 Time 14 minutes 2 1700 OSCILLOSCOPE SERIES SERVICE 4 1710A ELECTRICAL Block diagrams and simplified schematics are used in this program to clarify the operation of the low vol tage power supply the bright scan mode and the logic controlled trigger circuit of the 1710A Oscillo scope Major electrical aspects are examined and the troubleshooting tips offered will be of great prac tical help to service personnel HP stock number 90030__ 798 Time 14 minutes These two tapes are part of a four part series on the 1700A Oscilloscope series Operation was covered in tape 90030__ 673 Power supplies are reviewed in tape 90030__ 674 To order these tapes or for more details contact your local HP Office NEW SERVICE ORIENTED VIDEO TAPES AVAILABLE Two new service oriented video tapes are available which should be especially valuable to service person nel The programs cover the mechanical and electrical aspects of the 1700A Oscilloscope Series CAN YOU SOLVE THIS Since service work requires a very logical procedure io get optimum re sults here s a challenging exercise to test your logic It may be ideal to try this one when you are relaxed and away from the noise of the shop be cause this puzzle may require deep concentration It can be
32. rt is considered an assembly if one or more parts were combined to make the part Did someone put to gether the desired part A switch pur chased from a supplier would have a number such as this 3100 NNNN If someone soldered wires or compon ents on the switch it would then be considered an assemoly and as signed an appropriate number Com ponent numbers are used when a parti cular component was designed for use in a specific instrument An exam ple of this is a special hybrid circuit or device such as a sampler A mask for a front panel indicator may have a 8NNNN suffix Documentation in cludes operating and service manuals and other printed matter Special parts may be supplied in instruments or dered with a specific modification For example if you are repairing a board with p n 05326 90002 the 9 indicates that this board is special and there fore is different from the board normal ly supplied in the instrument Here s a short quiz to further illustrate the point Let s say you are working on an HP 5055A Digital Aecorder and after repairs you notice the paper tray is damaged What is the HP part number Instead of randomly search ing through the paris list we first deter mine a great deal by examining the pan 1 Is this a component that is is this a part that might be stocked at a lo cal electronics distributor If so it has an eight digit number 2 Is this part manufactured by HP for use in hun
33. unction A transistor with an 1850 or 1851 prefix is germanium and therefore you should expect about 0 2V drop across its B E junc tion IN THIS ISSUE NEW SERVICE NOTES HIGH FREQUENCY POWER LIMITER PARTS IDENTIFICATION CLUES NEW VIDEO TAPES SERVICE TIPS Pulse generator waveform Magnetic tape discontinued RACING QUIZ PARTS IDENTIFICATION Table COMPONENT PART MATERIAL Capacitors Variabie mechanical Capacitors Voltage Variable semiconductor Capacitors Fixed Nine Capacilors Fixed Capacitors Fixed Electrolytic Capacitors Fixed Electrotytic Insulating Materials Insulators Formed Knobs Control Spacers and Standotfs Crystals Adhesives Relays Fasteners 0674 thru 0778 Resistors Fixed non wire wound 0811 thru0831 Resistors wire wound 1200 Sockets for components 1205 Heat Sinks 1250 Connectors AF and related parts General Usage Parts There are quite a few parts that are built by HP to be used in many differ ent HP instruments The main charac teristic of this category is that you would not expect to find any of these parts used in a competitor s product unlike the previous category dis cussed These include such items as covers side frames rack mounting hardware etc An example of this is side frame 5060 0732 this is an as sembly used in the 5245L 5244L 5242L 5065A and others Table 2 gives the prefixes for general usage HP manufactured parts T
34. visions SERVICE ne f new SERVICE NOTES HIGH FREQUENCY OVERLOAD PROTECTION A limiter is available ihat provides input protection for a variety of instruments Many times the input circuits of spectrum analyzers samplers or amplifiers can be damaged by excessive input signal levels These could be either transients or short duration overloads Office Model 11693A Limiter protects inputs from up to a 75W peak or 1 Watt continuous power Also signa genera iors Can be protected from application of reverse power A typical application shown in Figure 1 is the protection of a spectrum analyzer input from inadvertent overload due to high level signals from an antenna The Limiter has Type N connectors and an insertion loss of less ihan 20B For more information call your local HP ECT RUM ANAL vA ANTENA Lea y Figure 1 SUODIEMEN tO BENGH iis DERVISHIN OIA Here s the latest listing of Service Notes available for Hewlett Packard products Service Notes contain information that will help you get the most out of your purchases Many times design changes or other improvements are made fn products currently being manufactured HP often recommends including these changes in products previously sald this is done by writing a Service Note for the product Service Notes for your instruments can be obtained by using the Service Note Order Form Remove the order form and mail it to the HP
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