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HP-97 Service Manual

1. GG BATTERY POWER Vss 202 Sl els 2 1 985 oy gt ao ajaja TAIL 31 4 Y YY Y vu 7 13 12 11 098 7 6 5 15 20 18 19 1 16 14 Figure 4 10 Logic 1 Schematic Diagram 4 15 Component Level Maintenance 4 21 PRINTER ASSEMBLY MAINTENANCE 4 22 The maintenance procedures for the HP 97 printer assembly are divided into two sections printer mechanical maintenance and printer electrical maintenance It is very important that the mechanical portion of the printer assembly print head dc motor reed switch head cable connector gears and associated parts be repaired before the mechanical and electrical portions are connected together and a print command is given Printer mechanical assembly parts replacement is accomplished with the aid of the exploded view drawing of the assembly See figure 6 2 4 23 the mechanical portion of the printer assembly has been repaired reconnect the head connector motor leads and reed switch leads to the printer printed circuit assembly and follow the electrical troubleshooting and adjustment procedures as outlined in figure 4 18 4 24 Printer Mechanical Maintenance 4 25 perform printer mechanical maintenance per form the following steps a Test the out of paper switch as follows 1 Remove paper from the printer a
2. 4 23 4 23 Keyboard A2A1 Schematic Diagram 4 23 4 24 Card Reader Switch Adjustment Screws and Test Points 4 24 4 25 WA and WB Waveforms 4 24 4 26 RA and RB Waveforms 4 24 4 27 Card Reader PCA A3A1 Component Location 4 25 4 28 Card Reader A3A1 Schematic Diagram gt e 4 25 4 29 Card Reader Troubleshooting Flowchart 4 26 5 1 HP 82033A Battery Pack 5 1 5 2 82031A AC Adapter Recharger 5 1 5 3 HP 82032A Adapter Recharger 5 1 5 4 HP 82032A Opt 001 AC Adapter Recharger 5 1 5 5 HP 82039A AC Adapter Recharger 5 2 5 6 HP 82040A AC Adapter Recharger 5 2 5 7 HP 82043A AC Adapter Recharger 5 2 5 8 82044A Security Cable and Lock 5 2 5 9 HP 82037A Reserve Power Pack 5 2 5 10 Reserve Power Pack Schematic Diagram cero Ree Re RE ERA 5 3 6 1 97 Exploded View 6 2 6 2 Printer Assembly Exploded View 6 5 6 3 Reader Exploded View 6 6 B 1 Symbol Identification B 1 C 1 Program Memory Test Program 1 Table Title Page 1 1 97 Function Key Index 1 2 1 2 97 Programming Key
3. C 4 General Information HP 97 The HP 97 Programmable Printing Calculator Automatic Memory Stack Registers Displayed X E PRINT SPACE REG STACK ZI DEG RAD GRD s ES 557 Re X y X gt STF CLF RND DSZ 162 CJ 5 sonen X 0 X gt lt 0 ABS LOG INT HMS C2 3 83820258 3 w 00000 E PAUSE N K ACH E WRITE DATA MERGE LASTX HMS WI HEWLETT PACKARD 97 CALCULATOR Addressable Storage Registers Program Memory Primary Registers Address I 25 124 Ro 23 22 21 Protected 20 Secondary Registers i Address Figure 1 1 HP 97 Keyboard and Memory 1 0 SECTION General Information 1 1 INTRODUCTION 1 2 This manual contains the information needed to troubleshoot disassemble repair and test the HP 97 Programmable Printing Calculator See figure 1 1 1 3 The repair process for this calculator is broken up into two parts assembly level and component level repairs Basic operating information specifications theory of operation and maintenance information are included 1 4 This section contains basic operating information along with the specifications for the HP 97 Tables 1 1 and 1 2 list the various HP 97 keys and their functions Improper operations l
4. 2 97 C 13 DATA CARD 1 C 14 Data card 1 is used in conjunction with the functional test and also during troubleshooting of the card reader assembly This card is employed to check writing and reading capability and therefore should be blank when used C 15 number of cards can be erased at one time for use in later repairs as data card 1 using the following procedures a Switch a working calculator ON b Switch to PRGM mode c Feed both sides of the card through the card reader C 16 DATA CARD 2 Table C 2 Data Card 2 REGISTER NUMBER 4 751772678927 9 382 J Siti 6 800800002 22 2 800200600 02 28 88 2 08 0 22 4 44444444 4 3 332332333 33 4 A 4 444444444 44 mt u 1 4143 714 PRRBEERGE 77 3 BBPPBBRBPB BP Ha t RI Cy t 35 co 74 Oy CH Pain Service Cards C 17 Data card 2 is used in conjunction with the functional test It can be prepared using the following procedures a Switch a working calculator ON b Enter the numbers shown in table C 2 into the indicated registers c Press w oata d Feed side 1 of the card through the card reader Clip both notched corners of the card C 18 DIAGNOSTIC TEST PROGRAM CARD C 19 This diagnostic test program is used to ensure that the calculator will not fail when
5. CR10 conducts turning on transistors Q4 and Q5 Current is drawn from the battery through R10 until Vg falls below Vss Figure 2 9 Over Voltage Circuit 97 2 M BATTERY CHARGING 2 42 Figure 2 10 illustrates the battery charging cir cuitry The ac adapter recharger is a transformer that drops the line voltage to 12 8 Vac at the input terminals of the calculator Diodes through CRA rectify the alternating current and resistor R4 limits the dc current applied to the batteries When the ON OFF switch is turned ON limiting resistor R3 is shunted and the dc voltage is applied directly to the battery pack and the calculator power supply Transistor Q1 turns on during periods of high display current demands Note With batteries removed the calculator will not be damaged by connecting the ac adapter recharger to the input terminals however it will not operate correctly until the batteries have been reinstalled E 7 Calculator Adapter Recharger T gt 1 1 gt x 3 Input i k l 1 11 V u P J Figure 2 10 Battery Charging Circuit Theory of Operation 2 43 POWER ON PRESET 2 44 To ensure that the logic contained within the ACT comes up in the correct logic state when power is applied to the HP 97 a
6. ae HH 8853 e 3 gt Analia E 858 819 tira PEO ooo Figure 4 23 Keyboard PCA 2 1 Schematic Diagram 4 23 Component Level Maintenance 4 35 CARD READER TROUBLESHOOTING 4 36 To repair a malfunctioning card reader follow the troubleshooting flowchart given in figure 4 29 Refer to the card reader exploded view in figure 6 3 for aid in dis assembly 4 37 When removing or reinserting the card reader cable use the HP 91 97 connector tool part number T 155435 as described in section 3 24 step 6b 4 38 Note that the HP 97 card reader is a precision electrical mechanical assembly containing several small and delicate parts Handle with care During disassembly and reassembly be sure the card reader motor is facing upward otherwise small parts may fall out 4 39 Avoid excessive handling of the leaf switch contacts on the card reader frame assembly dirt or grease on them prevents proper electrical contact During re assembly clean them while the head assembly is separate from the card reader support by lightly rubbing the contacts with an ink eraser Rub each only toward the end of the contact If any of the switch contacts are bent replace the leaf switch contacts rather than attempting to bend them into position 4 40 When the card reader motor speed cannot be adjust ed to within the proper limits
7. 2 4 2 10 Battery Charging Circuit 2 5 2 11 Power On Preset Circuit 2 5 3 1 97 Assembly Level Troubleshooting Flowchart 3 16 4 1 Faulty Function Verification and Repair sn hme 4 2 4 2 Program Memory 4 8 4 3 1 Replacement Flowchart Functional Test 4 11 4 4 5 and CR6 Anode Waveforms 4 12 4 5 2 Waveforms 4 12 4 6 SYNC 4 12 4 7 STR and RCD Waveforms 4 12 4 8 Logic PCA Troubleshooting Flowchart pirlo 4 13 4 9 Logic Al Component Location Diagram 4 15 4 10 Logic PCA A1 Schematic Diagram 4 15 4 11 Printer Lead Location 4 16 4 12 Print Head Cable Removal 4 16 4 13 Print Head Cable Insertion 4 17 4 14 Print Head Cable Contacts 4 17 4 15 Head Carriage Home Position 4 17 4 16 FWD Waveform 4 18 4 17 STB Waveform 4 18 4 18 Printer PCA Troubleshooting Flowchart 4 19 4 19 Printer A4A1 Component Location 4 21 Figure Title Page 4 20 Printer A4A1 Schematic Diagram 4 21 4 21 LED Digit loto 4 22 4 22 Keyboard PCA A2A1 Component Location
8. 97 Programmable Printing Calculator SERVICE MANUAL 5 220557013 29 EMT 27X 1 604392937 22 257 1 PRINT SPACE PRGM REG STACK c3 DEG RAD GRD 5 nn oe Go ose n fest Re XY XS STF CLF RND DSZ 152 4 5 6 Go C3 XU NER 5507 ABS LOG O INT 5 HMS ES BOE to Es PAUSE N x 8 Z WRITE DATA MERGE LASTX HMS 67 HEWLETT PACKARD 97 CALCULATOR HEWLETT lo PACKARD HEWLETT PACKARD HP 97 Programmable Printing Calculator SERVICE MANUAL 00097 90130 HEWLETT PACKARD COMPANY Printed August 1976 1000 Circle Blvd Corvallis Oregon 97330 Contents Section Page Section Page GENERAL INFORMATION 4 4 Logic Troubleshooting 4 1 Introduction 1 1 4 6 Power Supply Troubleshooting 4 1 4 8 Faulty Function Verification 1 5 1 1 1 7 Compatibility 1 1 PET Bes ac mno 17 NUR Ti 1 10 1 i ee BOB BEDIENT ps 4 12 Initial Test rca u 4 6 1 13 Standard Accessories 1 1 4 14 M T 1 15 Optional Accessories 1 1 RN P rogram Memory 4 6 4 16 Functional 4 8 Il THEO
9. if not return to Q on figure 3 1 Table 3 4 Functional Test STEP PROCEDURE DISPLAY PRINTOUT Set switches TRACE NORM PRGM run 2 Press 0 00 3 Read side 1 of functional test card Crd 4 Read side 2 of functional test card 0 000000000 00 5 Switch to PRGM mode 000 6 Press 224 24 7 Press 001 00 8 Press 8 000 9 Press 001 21 11 10 Switch to RUN mode 0 000000000 00 11 Press 7 777777777 77 pause Crd Feed side 1 of data card 1 Crd Feed side 2 of data card 1 6 000000000 00 flashing Again feed side 1 of data card 1 Crd Feed side 2 of data card 1 6 000000000 00 pause 1 000000000 00 flashing Read side 1 of data card 2 1 000000000 00 pause 18 12 xxx 4 444444444 44 2 333333232 33 2 282222222 22 1 111111111 11 3 6 97 Assembly Level Maintenance Table 3 4 Functional Test Continued STEP PROCEDURE DISPLAY PRINTOUT 8 B B 8 4 444444444 44 3 333333333 33 2 222222222 22 1 111111111 11 8 888888080 27 T G J 04 QH 64 Pa A 8 888888888 88 218 21 16 13 200 41 001 21 11 Switch to PRGM mode Press 0000 Press 6 PRINT Immediately after line 209 appears switch print mode to TRACE mode Error Error 8 888888888 88 Insert
10. 1219 Si cos 2 B 9 m 2 z p 88809080800 amp ES 7 88829 3 2 97 Assembly Level Maintenance Table 3 1 Individual Key Sequence Tests Continued OPERATION KEYSTROKES DISPLAY PRINT 6 CJ 6 42 6 CJ 4 2 Bs 6 70 s 7 8 6 6 56 3 21 7 G 10 23 3 4 5 00 36 87 3 S C 36 87 5 C3 4 00 3 00 c a 2 72 1 00 G G 1000 00 2 0 0 1 30 2 256 00 1 1 00 1 2 2 00 3 4 4 PRINT 4 00 RCL PRINT 8 88 1 88 1 2 808 2 08 3 4 084 B E 6 00 F 6 06 D E 8 08 1 5 609 s EE s B c REG GES 90 69 1 2 281 0 5 s EJ 0 2 ED 3 3 Assembly Level Maintenance HP 97 Table 3 1 Individual Key Sequence Tests Continued OPERATION KEYSTROKES DISPLAY PRINT SGA amp 5 882 BB SSERSQCSSUOGUO 0828 5 a key down key up key down key up 0000 00009 PRGM PRGM RUN positive i QJ 2 3 5 PRGM RUN Ome Prem 5 negative 1 amp Prem PRGM RUN moa PRGM RUN 8 PRGM TI RUN PRGM TI a
11. as described in the procedures of figure 4 29 the eccentric cam must be replaced and or adjusted as follows a Carefully unsolder the red motor lead from the card reader printed circuit board and connect a current meter between the lead and its pad HEAD SWITCH GROUND Figure 4 24 Card Reader Switch Adjustment Screws and Test Points 4 24 HP 97 Insert a card into the card reader slot until the motor engages and starts to pull the card but do not allow the card to be pulled through Adjust the eccentric cam see figure 6 3 until the current meter reads 180 20 mA Perform the fine adjustment of motor speed using the procedures of figure 4 29 WB WA Test points Pins 11 WB and 10 WA of CRC A1U3 Oscilloscope time base 2 msec div Vertical gain 2 V div Figure4 25 WA and WB Waveforms RB RA Test points Pins 7 RB and 8 RA of CRC A1U3 Oscilloscope time base 2 msec div Vertical gain 2 V div Figure4 26 RA and RB Waveforms 97 Table 4 10 Card Reader Printed Circuit Assembly 1 Replaceable Parts HP PART DESCRIPTION NUMBER REFERENCE DESIGNATION 0698 3151 RESISTOR fxd 2 87K 0757 0279 RESISTOR fxd 3 16K 0757 0433 RESISTOR fxd 3 32K 0698 3152 RESISTOR fxd 3 48K 0757 0434 RESISTOR fxd 3 65K 0698 3153 RESISTOR fxd 3 83K 0698 5808 RESISTOR fxd 4 0K
12. 0 b c Cathode Driver See paragraph 4 33 c e f LED Module d Anode Buffers 1 Segments b or d missing replace 04 2 Segments e f g or h missing replace U3 Hd 4 33 CATHODE DRIVER IC REPLACEMENT 4 34 After replacing cathode driver integrated circuit 01 a new value for resistor R2 may have to be selected Refer to table 4 8 Table 4 8 Cathode Driver Resistor Selection Chart Resistor Values kilohms t 97 Table 4 9 Keyboard Printed Circuit Assembly A2A1 00097 60002 Replaceable Parts REFERENCE HP PART 0683 4715 RESISTOR fxd 470 ohm 0683 2045 RESISTOR fxd 200K 0684 3341 RESISTOR fxd 330K 0812 0058 RESISTOR fxd 8 2 ohm 2W 0811 1674 RESISTOR fxd 4 7 ohm 2W 0698 8691 RESISTOR fxd 4 0 ohm 1 0683 1835 RESISTOR fxd 18K 5 4W 0683 3915 RESISTOR fxd 390 ohm 1990 0450 LED low battery indicator 1853 0393 TRANSISTOR PNP 1853 0401 TRANSISTOR PNP 1853 0374 TRANSISTOR PNP 1854 0071 TRANSISTOR NPN 1820 1629 INTEGRATED CIRCUIT cathode driver 1990 0595 DISPLAY numeric 1858 0044 INTEGRATED CIRCUIT quad transistors 1810 0252 INTEGRATED CIRCUIT resistor network 1251 3955 CONNECTOR 9 pin 8120 2206 CABLE 24 conductor 00097 80002 BOARD etched DRIVERS DRIVERS 1 U1 CATHODE DRIVER Figure 4 22 Keyboard A2A1 Component Location Diagram Component Level Maintenance
13. 0 where 999 gt INTI 19 En 0 O 62 8 C G9 B J where magnitude of number in storage register would then be larger than 9 999999999 x 1033 ED 0 0 69 8 0 69 3 0 where ABS INT I gt 25 or where magnitude of number in storage register addressed by I would be larger than 9 999999999 x 10 Card Reader malfunction PRINT PRINT stack PRINT REG PRINT SPACE where there is no paper in calculator Attempting to record on a protected side of a magnetic card Improper Operations APPENDIX A A 1 A 2 APPENDIX Symbols and Abbreviations Resistor Capacitor Transistor NPN Transistor PNP Diode Switch Inductor Transformer Variable Resistor Zener Diode Battery Integrated Circuit Figure B 1 Symbol Identification B 1 Symbols and Abbreviations Table B 1 Reference Designations and Abbreviations assembly motor synchro battery capacitor circuit breaker diode delay line indicator Misc electrical parts fuse filter receptacle connector amperes alternating current silver aluminum as required adjust assembly base bandpass bits per inch black blue brown brass British thermal unit beryllium copper Characters per inch collector clockwise counterclockwise ceramic common cathode ray tube 7 complementary transistor logic 7 cathode cadmium plate compositio
14. 0 2 s 659 3 prom RUN ES 5 xsy G LBL GTO 2 gt u 2 il o 511 B A x lt gt PRGM RUN RIG lt 57 J 5 3 0000606 0000 01 4 27 0 s 8 Prem TT RUN PRGM GE 3 4 97 OPERATION 870515 SPACE 690 E 0 sz B is KEYSTROKES Gus En O Prom 5 9 06 Bake 5 0 2 a 875813 insert data card 1 orr IT on orr B O verse insert card again 2 PRINT space 5 63 ED 5 0 69 13 0028 PRGM RUN 1 B 0 52 RUN 3 9 FULL OPERATIONAL TEST 3 10 The Full Operational Test is used to verify proper functioning of the assembled calculator before it is returned to the customer 3 11 This test is comprised of the following separate tests which should be run in the order shown a Initial test Program memory test Functional test Keyboard test Diagnostic test 3 12 INITIAL TEST 3 13 this test a Set switches as follows orr TRACE MAN Norm PRGM RUN b Press the keys listed in table 3 2 After each keystroke the calculator s display and printout should be identical to the nu
15. 0698 3154 RESISTOR fxd 4 22K 0698 4442 RESISTOR fxd 4 42K 0698 3155 RESISTOR fxd 4 64K 0698 4444 RESISTOR fxd 4 87K 0757 0438 RESISTOR fxd 5 11K 0698 3258 RESISTOR fxd 5 36K 0757 0200 RESISTOR fxd 5 62K 0698 3515 RESISTOR fxd 5 9K 0757 0290 RESISTOR fxd 6 19K 0698 3226 RESISTOR fxd 6 49K 0757 0439 RESISTOR fxd 6 81K 0698 4471 RESISTOR fxd 7 15K 0757 0440 RESISTOR fxd 7 50K 0698 3259 RESISTOR fxd 7 87K 0757 0441 RESISTOR fxd 8 25K 0757 0288 RESISTOR fxd 9 09K 0757 0927 RESISTOR fxd 1 3K 2 0757 0940 0180 2615 0 180 2664 0180 2663 1901 1098 RESISTOR fxd 4 7K 2 CAPACITOR fxd 22 uf CAPACITOR fxd 3 3 uf CAPACITOR fxd 6 8 uf DIODE silicon 1854 0071 TRANSISTOR NPN 1826 0322 INTEGRATED CIRCUIT sense amp 1251 4426 CONNECTOR 13 pin 00097 80003 BOARD etched Value of is selected RED YEL BLK ORN BLU TP8 TP9 TP10 TP11 GND M F 13 Figure 4 27 Card Reader 1 Component Location Diagram Component Level Maintenance CARD READER HEAD HEAD ASSEMBLY po ce A3A2 1 y 1 TRACK 1 TRACK 2 2 gt C1 10 HEAD WRITE MOTOR SWITCH PROTECT SWITCH Lorca I TP11 TP10 TP9 TP8 I l I R32 R2 2 Y oO e JE 72 YN a E 2 ul o o lt olo 8 gt 5 z lt z gt gt 11 13 12 2 8 106 9 7 34 5 1
16. 2W 1853 0395 TRANSISTOR PNP 1854 0668 TRANSISTOR NPN 1854 0071 TRANSISTOR NPN 1854 0713 TRANSISTOR NPN os 1900 3594 TRANSFORMER toroidal 1820 1812 INTEGRATED CIRCUIT ACT 1818 0225 INTEGRATED CIRCUIT ROM 0 1820 1751 INTEGRATED CIRCUIT CRC 1820 1723 INTEGRATED CIRCUIT PIK 1818 0228 INTEGRATED CIRCUIT ROM 1 1818 0226 INTEGRATED CIRCUIT ROM 2 1818 0233 INTEGRATED CIRCUIT ROM 3 1818 0229 INTEGRATED CIRCUIT ROM 5 1818 0230 INTEGRATED CIRCUIT ROM 6 1251 0600 CONNECTOR 1 pin 1251 4426 CONNECTOR 13 pin 1251 4289 CONNECTOR 21 pin 8159 0005 WIRE jumper 00097 80001 BOARD etched J3 J2 J1 e TP5 DATA e 4 F2 TP2 SYNC e TP1 GND IS 1A OOPS gt oS P1 1 XA2P1 18 TP7 Vag 6 02 5 01 BAT RCHR PINS PINS Figure 4 9 Logic PCA Al Component Location Diagram Component Level Maintenance x u 5 5 E lt lt lt XA2P2 2 XA2P1 ADVANCE XA2P1 2 1 2 2 o 5 i Av AAA 9 3 2 1 6 5 9 14 10 11 12 16 13 15 TP 3 4 6 7 8 9 10 11 12 13 5 2 1 7 8 7 182 1 5 6 a 47 a a x amp 8 8 815 8 gt 2 als v x x z 2 2 F2 cz SAA DATA
17. 5385 5040 9256 5040 9257 5040 9258 5040 9259 5040 9260 5040 9261 5040 9262 5040 9263 5040 9264 5040 9265 5040 9266 5040 9267 5040 9268 5040 9269 5040 9270 5040 9271 5040 9272 5040 9273 5040 9274 5040 9275 5040 9276 5040 9278 5040 9298 5040 9299 5040 9401 5040 9402 5040 9403 5040 9404 5040 9405 5040 9406 5040 9407 5040 9408 5040 9409 5040 9410 5040 9411 5040 9412 _ 5040 9413 5040 9414 5040 9415 5040 9416 5040 9417 5040 9418 Replaceable Parts Table 6 2 Keyboard Assembly A2 Replaceable Parts HP PART NUMBER DESCRIPTION QTY PCA A2AI keyboard refer to table 4 9 KEYBOARD WINDOW SPACER large SPACER small CONTACT switch 6 row CONTACT switch 5 row SPRING compression SPRING compression HAT large HAT small SWITCH SPRING switch LABEL ID US e KEY KEY 5 m 2 AR mm lt BaBgggeseesesgeasce gt 5 lt RAR t m m m lt lt lt lt KEY lt KEY EG KEY KEY KEY KEY KEY KEY KEY EN x 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 6 3 Replaceable Parts HP 97 Table 6 2 Keyboard Assembly A2 Replaceable Parts Continued HP PART NUMBER DESCRIPTION 5040 9419 5040 9420 5040 9421 5040 9422 5040 9423 5040 9424 5040 9425 5040 9426 5040 9427 5040 9428 5040 9482 5040 9483 5040
18. 6 4 Card Reader Assembly Replaceable Parts FIGURE amp INDEX NUMBER HP PART NUMBER DESCRIPTION e PCA A3Al card reader refer to table 4 10 8120 2301 CABLE interconnecting 00067 60904 ASSEMBLY motor service 00067 60905 ASSEMBLY A3A2 head service 00067 60910 ASSEMBLY drive roller service 5040 9479 SUPPORT card reader 00065 20201 ROLLER 0516 0031 SCREW machine 00065 20202 CAM eccentric 0624 0393 SCREW 2 28 0 375 0624 0307 SCREW 2 28 x 0 250 0624 0308 SCREW 0 48 X 0 085 00097 00001 SWITCH card reader 1410 0848 BEARING ball 1460 0558 SPRING side load 1 3 0 LV NS Figure 6 3 Card Reader Exploded View 6 6 If you attempt a calculation containing an improper operation say division by zero the calculator display will show In addition if the Print Mode switch man voru is set to NORM or TRACE the word will be printed unless the calculator is out of paper The following are improper operations where x 0 where 0 0 where lt 0 and x is non integer where x lt 0 where x where x lt 0 where x lt 0 where is gt COS 1 where is gt 1 8 where x 0 E where n 0 5 wheren lt 1 where 0 a where ABS INT I gt 9 a where ABS INT I gt 25 0 where ABS INT I gt 25 52 f 052140 where ABS INT D gt 25
19. 9484 5040 9485 o o o 0 o o O o o Table 6 3 Printer Assembly A4 Replaceable Parts FIGURE amp INDEX S MER DESCRIPTION NUMBER A4A1 printer refer to table 4 7 00091 60009 ASSEMBLY A4A2 print head 00091 60025 ASSEMBLY head carrier 00091 60015 ASSEMBLY A4A3 motor 00091 60026 ASSEMBLY 4 4 reed switch 00091 60014 ASSEMBLY paper feed cam 5040 8995 GEAR lead screw 5040 8996 GEAR idler 5040 8997 PUSHER platen 5040 8998 HOLDER platen pusher 5040 8999 BAR tear 5040 9201 HOUSING printer 5040 9227 BUSHING 5040 9228 ROLLER pinch 5040 9745 PLATEN lapped 0510 0261 RING retaining 3 32 0510 0810 RING retaining 1 16 0515 0033 SCREW m2 0 40 5 mm 0570 0905 SCREW 1 72 X 0 312 in 0624 0303 SCREW 2 28 x 0 312 in 1460 1461 SPRING extension 1460 1505 SPRING pusher 1480 0436 PIN dowel 1500 0465 SHAFT idler 1500 0466 ROD guide 1500 0468 SHAFT pinch roller 1530 1872 CLAMP head 1600 0540 CONTACT sensor 1600 0540 SENSOR 3050 0626 WASHER flat 5020 9234 LEAD SCREW microsealed 9270 0513 PAPER thermal gt N Me RB Re gt 6 4 Replaceable Parts HP 97 q lt Y Y 1 8 D b Q 4x5 1 Figure 6 2 Printer Assembly Exploded View 6 5 Replaceable Parts HP 97 Table
20. Ca tA vel as aua ar iii 6 1 3 9 Full Operational Test 3 5 A II 3 5 Appendix IMPROPER OPERATIONS 3 14 Program Memory 3 6 I 3 16 FunctionalTest 3 6 Appendix SYMBOLS AND ABBREVIATIONS 3 18 Keyboard Test 3 8 3 21 Diagnostic 3 8 Appendix SERVICE CARDS 3 24 HP 97 Assembly Removal and 1 Replacement Procedures 3 9 l Introduction C 1 C 7 Program Memory Test Program Card C 1 IV COMPONENT LEVEL MAINTENANCE C 10 Functional Test Program Card i cec us C 1 C13 Data Card T nc en an a Dann C 3 4 1 Introduction 4 1 016 Data Card 3 4 3 Recommended Tools and Fixtures 4 1 C 18 Diagnostic Test Program Card C 3 Figure Title Page Figure Title 1 1 97 Keyboard and Memory 1 0 2 3 LED Display Format 2 1 97 Block Diagram 2 1 2 4 SYNC and Display Timing 2 2 LED Digit ue 2 2 2 5 Timing Diagram li 97 Figure Title Page 2 6 2 3 2 7 Printed Character 2 3 2 8 HP 97 Power Inverter Circuit 2 4 2 9 Over Voltage
21. MOTOR 6 SPEED 14 CR1 5 3 ts V Q 3 me ome R C D NETWORK lt a RIVERS Q Q O DR OO 8 9 P mE 0 0 ve 9 common A INTENSITY 3 95 13 CABLE HEAD INTERFACE FLEX CABLE CABLE BOARD INTERFACE THERMAL HEAD 135 gt hi V pee y 18 V L1 NOTE LC2 Q1 012 ARE TRANSISTORS IN QUAD ASSEMBLIES U1 U2 AND U3 19 16 17 Figure 4 20 Printer 4 1 Schematic Diagram 4 21 Component Level Maintenance 4 28 KEYBOARD TROUBLESHOOTING 4 29 If keyboard does not respond when any key is pressed check for 1 Bad connection between logic board and keyboard 2 Bent connector pins 3 Bad keyboard 4 30 DISPLAY TROUBLESHOOTING 4 31 Figure 4 11 shows the LED digit structure To test a Digit over bright on display key in 8 888888888 88 Display should correspond to the LH numbers keyed in Possible problems are CH Wu b Digit has tendency to turn on next digit causing ghost FAL M Sp nd image to appear igit missi MT One digit missing segments All digits missing same segments Single digits missing from display Segments of digits shorted Figure 4 11 LED Digit 4 22 HP 97 4 32 gt Probable causes for problems listed above are Problem Item Caused By d f ROM
22. RESISTOR fxd 4 22K 1 0698 3496 RESISTOR fxd 3 57K 1 amp W 0757 0273 RESISTOR fxd 3 01 1 Ys W 0757 0431 RESISTOR fxd 2 43 1 0698 4430 RESISTOR fxd 1 91K 1 W 0698 4424 RESISTOR fxd 1 4K 1 W 0757 0422 RESISTOR fxd 909 ohms 1 W 0698 3453 RESISTOR fxd 196K 1 0757 0466 RESISTOR fxd 110K 1 0757 0464 RESISTOR fxd 90 9K 1 W 0757 0462 RESISTOR fxd 75 3K 1 WW 0757 0459 RESISTOR fxd 56 2K 1 0698 3450 RESISTOR fxd 42 2K 1 WW 0757 0123 RESISTOR fxd 34 8K 1 1853 0393 1858 0044 TRANSISTOR PNP TRANSISTOR quad 1826 0287 1810 0236 INTEGRATED CIRCUIT comparator NETWORK passive 9100 3850 INDUCTOR 140 uH 1251 0600 1251 4143 00091 80001 CONNECTOR pin male CONNECTOR 9 pin BOARD etched GND GND FWD REV BRK R7 R6 R5 R4 R3 R2 R1 STB LC2 HOM O O 2 OPS N Figure 4 19 Printer 4 1 Component Location Diagram CONNECTOR 1 1 Component Level Maintenance ve 12 2 c3 GND 3 4 US HOM OPS FWD REV BRK R1 R2 R3 R4 R5 R6 R7 Lc1 LC2 SS STB 2 a13 i I SON i i R5 Li 9 p 5 lt HOME 8 ii 99g sc R4 R7
23. Rubber Feet Removal Replacement a Grasp each rubber foot firmly with a needle nose pliers d Cut off excess rubber b Pull out firmly to remove 3 10 97 Printer Assembly Removal Perform removal replacement procedures 1 and 3 Remove the three printer supporting screws Carefully disconnect printer PCA from logic board Carefully lift out the printer assembly from calculator Logic Printed Circuit Assembly Removal a Pull up alternating pressure between the left hand and right on the logic PCA until it is free of the 18 and 9 pin connectors on the keyboard PCA Remove the card reader cable from the connector on the logic board by inserting the large end of the connector tool T 155435 into the connector and then pulling the cable free During reassembly insert the cable together with the connector tool into the connector then remove the cable tool NOTE The cable should be positioned with its contacts facing the top of the connector and the connector tool should be positioned between these contacts and the connector Assembly Level Maintenance Assembly Level Maintenance 3 12 Carefully disconnect the ac adapter recharger leads two white and the battery leads one red white and one red from one side of the logic printed circuit board and the three paper advance switch leads one red one black and one white from the other side ofthe board 3 Lift off the logic printed c
24. W Figure 4 28 Card Reader PCA 1 Schematic Diagram 4 25 NOTE A PORTION OF THIS FLOWCHART APPEARS ON PAGE 4 27 1 FEED BLANK CARD 2 HOLD CARD WITH TWEEZERS AND DOES m t FEER SIDE DIP INTO MAGNA SEE vES INSERT CARD MOTOR SEE BOTH TURN ON 2 PRESS 0 LOOK FOR TRACKS MAGNETIC TRACKS ON NO REVERSE SIDE OF NO CARD 1 PRESS D oan 2 FEED BLANK CARD 3 HOLD CARD WITH TWEEZERS AND YES READ SIDE 1 OF DIP INTO MAGNA DATA CARD 2 SEE 4 COMPARE LENGTHS OF TRACKS TO LIMITS NO YES GIVEN BELOW READ SIDE 1 OF OATA CARD 2 Is YES FEED SIDE 2 OF Error PRESS p won DATA CARD 2 DISPLAYED NO LEAOING EDGE Component Level Maintenance CONNECT CONTI NUITY TESTER BETWEEN GROUND AND PIN MOTOR SWITCH M TEST POINTS TURN SCREW ON MOTOR SWITCH CONTACT SEE FIG 4 24 CLOCKWISE UNTIL TESTER LIGHTS THEN TURN COUNTERCLOCKWISE Ya TURN MONITOR MTRS PIN OF CRC WITH VOLT METER OR OSCILLOSCOPE INSERT CARD INSERT CARD MONITOR VOLTAGE ACROSS MOTOR MONITOR MOTOR INSERT CARD PIN OF CRC INSERT CARD 15 Vu GREATER THAN 2 0V REPLACE CRC REPLACE SENSE AMP REPLACE MOTOR INSERT CARD DOES MOTOR TURN ON REPLACE ROM 6 INSERT CARD DOES MOTOR TURN ON NO TESTER DOES NOT LIGHT CLEAN C
25. and the calculator reassembled perform the full operational test paragraph 3 9 to ensure that all capabilities of the calculator are functioning correctly 3 6 RECOMMENDED TOOLS AND FIXTURES 3 7 INDIVIDUAL KEY SEQUENCE TESTS 3 8 Listed in table 3 1 are sequences of keystrokes that may be used to check for properly functioning HP 97 opera tions If the calculator s display or printout does not agree with the entry in the appropriate column the operation is not functioning properly and the logic PCA and or keyboard PCA should be replaced However in some cases proper functioning with the indicated keystrokes does not guarantee that the operation functions properly with other acceptable key sequences Therefore if a calculator is received for repair with a particular operational key sequence that does not perform properly this key sequence should be used to verify the complaint rather than the key sequence in table 3 1 After performing the key sequence test s return to P on figure 3 1 HP PART MODEL NUMBER DESCRIPTION 6040 0297 8700 0003 8700 0006 8710 0026 8710 0549 8730 0008 8730 0020 8500 0232 T 155321 T 155239 T 155435 00091 92137 97 ET 9613 91 M ET 9613 91 A ET 9610 See appendix C See appendix C See appendix C See appendix C See appendix C Silicone Lubricant X acto Knife X acto Knife Blade Tweezers Needle Nose Pliers Small Flat Blade Screwdriver Phillips Screwdriver T F
26. con tents of automatic memory stack Prints contents of displayed X register Digit Entry Enters a copy of number displayed in X register into Y register Used to separate numbers Changes sign of mantissa or exponent of 10 in displayed X register E33 Enter exponent After press ing next numbers keyed in are exponents of 10 through s Digit keys Decimal point Number Alteration Gives absolute value of number in displayed X register Leaves only integer portion of number in displayed X register by truncating fractional portion Leaves only fractional portion of number in displayed X register by truncating integer portion Rounds mantissa of 10 digit number in X register to actual value seen in the display Number Manipulation Rolls up contents of stack for viewing in displayed X register GD Rolls down contents of stack for viewing in displayed X register Exchanges contents of X and Y registers of stack Clears contents of displayed X register to zero Display Control Selects fixed point display Selects scientific notation display Selects engineering notation display Followed by number key selects number of displayed digits Mathematics N Computes factorial of number in displayed X register Computes reciprocal of number in displayed X register Computes square of number in displayed X register Computes square root of number in displayed X
27. e 8 e e 9 9 2 1 3 0 4 3 Component Level Maintenance HP 97 Tabie 4 1 Faulty Function Repair Continued KEYCODE ROM FAILURE 000 5 02 Ga 2 0 2 NED ES PRINT q PRINT Gack DENE 2 GUE 5 GE 5 PRINT 0 PIK 3 S 3 3 0 3 0 0 PIK 3 STO RCL PRINT B A 4 B EEEE BE a 2 3 E e u UD CB CD Co Um oc Um 1 2 2 4 a B 8 A A amp A oU CD On 5888 2 gos 35 45 01 390800 88588 mo O 2 O 35 24 01 7 5 9 r E 97 co n m n 0 positive 1 0 negative i ti 2 dl o v JO jo 5 LP Table 4 1 Faulty Function Repair Continued key down key up key down key up 00068 PRGM IT RUN PRGM IT RUN of 7 3 RUN ame Prem 5 Prem PRGM RUN PRGM RUN PRGM RUN PRGM MIN RUN 1 2 3 D 8006 GI prom BT run ES G 20 5 lt o 2 gt PRGM TT RUN OG 3 r 3 3 1 7 5 0 3 prom TI RUN a Pause PRGM ru
28. is so detected the microprocessor generates an display 2 36 During a write operation the CRC interrogates the write protect switch when the head switch closes to determine if the card has a clipped corner If so the CRC inhibits the write operation and informs the microprocessor which generates an Error display 2 4 97 2 37 POWER INVERTER 2 38 Quick charge nickel cadmium batteries are the primary power source for the HP 97 The 5 0 nominal battery voltage is converted to 6 25 Vdc and to 12 0 Vdc by the transistor inverter circuit shown in figure 2 8 Figure 2 8 HP 97 Power Inverter Circuit 2 39 Transistor Q2 and toroidal transformer T1 form the basic inverter circuit With feedback from winding A Q2 oscillates at a frequency of approximately 20 0 kHz Wind ing B of T1 forms the tranformer primary from which is derived CRS rectifies and C4 filters the voltage from wind ing B The voltage from winding C is rectified filtered and doubled by the combined actions of C1 C2 CR6 and CR7 to produce the output voltage Voltage regulation of Vss is provided by controlling the frequency of oscillation of Q2 through the combined action of zener diode CR9 and transistor Q3 2 40 An over voltage circuit consisting of Q4 Q5 and R8 through R10 as shown in figure 2 9 prevents Vg battery voltage from rising above Vss When Vg approaches
29. program memory PROGRAM Mode Indirect Control Recalls number from I register into displayed X register To store number in 1 use When preceded by 38 52 52 the address or control value for that function is specified by the current number in I 52 Increment and skip if zero Followed by adds 1 to contents if I Followed by adds 1 to contents of storage register specified by value in I Skips one step if contents are then zero Decrement and skip if zero Followed by subtracts 1 from contents of I Followed by sub tracts 1 from contents of storage register specified by value in I Skips one step if contents are then zero Exchanges contents of displayed X register with those of I register Storage Store Followed by address key stores displayed number in specified primary storage register R through Ra through Re I Also used to perform storage register arithmetic Recall Followed by address key recalls number from specified primary storage register through Rs Ra through Re I into the displayed X register Clears contents of all primary storage registers R through Rs Ra through Re I to zero Recalls number displayed before the previous operation back into the displayed X register Primary exchange secondary Exchanges contents of primary storage registers R through R with contents of protected secondary st
30. register Places value of pi 3 141592654 into displayed X register A C B Arithmetic operators Percentage Computes x96 of y Computes percent of change from number in Y register to number in displayed X register Logarithmic and Exponential Raises number in Y register to power of number in displayed X register Common antilogarithm Raises 10 to power of number in displayed X reigster Natural antilogarithm Raises e 2 718281828 to power of number in displayed X register Computes common logarithm base 10 of number in displayed X register Computes natural logarithm base e 2 718 of number in displayed X register Magnetic Card Control If a magnetic card is passed through the card reader immediately after this operation the contents of the storage registers are recorded on the card Merges rather than over writes data or program from mag netic card with data or program in calculator Polar Rectangular Conversion 13 Converts x y rectangular coordinates placed in X and Y registers to polar magnitude r and angle Converts polar magnituder and angle in X and Y registers to rectangular x and y coordinates Statistics Accumulates numbers from X and Y registers into secondary storage registers Rs through Rss Subtracts x and y values from storage registers Rs through Rss for correcting or subtracting accumulation entries 5 5 Computes mean average o
31. sets calculator to step 000 clears all flags and specifies FIX 2 and DEG modes Back step Moves calculator back one step in program memory Single step Moves calculator forward one step in program memory Delete Deletes current instruction from program memory All subsequent instructions moved up one step Pressed from the keyboard Go to Followed by n n n sets calculator to step nnn of program memory without executing instructions Followed by label designator 1 through 18 2 through o through 9 or causes calculator to search downward through pro gram memory to first designated label and begin execution there Go to subroutine Followed by label designator 3 through a 2 through m 0 through 9 causes calculator to start executing in structions beginning with designated label Return Sets calculator to step 000 of program memory PRINT Print program Prints contents of program memory beginning with current step and con tinuing until two consecutive instructions are encountered or Step 224 is printed After prefix key cancels that key After other keys does nothing Does not disturb program memory or calculator status Back step Sets calculator to and displays step number and keycode of previous program memory step when pressed displays contents of X register when released No instructions are executed Single step Displays step num
32. 1 11 10 Switch to RUN mode 0 000000000 00 11 Press 7 777777777 77 pause Crd Crd 6 000000000 00 flashing Crd 6 000000000 00 pause 1 000000000 00 flashing 1 000000000 00 pause 30 88997250 pause 2 238303285 21 pause 4 301773670 27 pause Feed side 1 of data card 1 Feed side 2 of data card 1 Again feed side 1 of data card 1 Feed side 2 of data card 1 Read side 1 of data card 2 1 be Puy fas La 0 3 1 2 2382383285421 4 381773678 27 Jg On Js e 4 9 Component Level Maintenance HP 97 Table 4 3 Functional Test Continued IC E STEP PROCEDURE DISPLAY PRINTOUT REPEACEMENT 3 r 8 3 4 444444444 44 2 333332333 33 0 3 1 2 222222222 22 1 111111111 11 8 1 8 888888888 88 See Fig 4 3 Switch to PRGM mode 218 2116 13 5 0 1 Press O 2 0 9 200 41 5 1 0 Press fl PRINT 001 21 11 5 1 0 za KEN 41 201 24 SIN 41 2 2 e 33 204 GSBc 2 16 13 285 FELE 3 11 5 0 3 PIK 288 RCLE 36 12 287 RELE 13 ne RCLD 26 14 289 13 218 14 Immediately after line 209 CRC if format of appears switch print mode to printout does not TRACE mode change as shown 211 Fi 212 213 FREE 218 SFC 215 FCLE 216 X 217 RS or nO SE 219 RCLI 320 22
33. 1 ETDa 222 521 223 PSE 224 RTN Insert side 2 of data card 2 Error ERROR Switch to RUN mode Error Press 8 888888888 88 4 10 97 Component Level Maintenance REPLACE IC S IN ACCORDANCE WITH POINT AT WHICH CAL CULATOR HALTS OR LOOPS SEE TABLE 4 4 RETURN TO STEP 1 OF FUNCTIONAL TEST TABLE 4 3 Table 4 5 IC Replacement Error Display DISPLAYED VALUE IC REPLACEMENT EN START DISPLAY ERROR REPLACE ERROR DISPLAY CRC ROM 6 IMMEDIATELY FOLLOW ROM 0 CARD READ OR WRITE RETURN TO STEP 1 OF FUNCTIONAL TEST TABLE 4 3 22 REPLACE IC S IN ACCORDANCE ER WITH DISPLAYED VALUE SEE 4 5 REPLACE THE INDICATED IC S ONE AT A TIME RETURNING TO STEP 1 OF FUNCTIONAL TEST AFTER EACH REPLACE MENT CONTINUE REPEATING THE FUNCTIONAL TEST REPLACING IC S UNTIL ERROR DISPLAY IS NOT GENERATED Figure 4 3 IC Replacement Flowchart Functional Test Table 4 4 IC Replacement Calculator Halted or Looping BETWEEN STEPS IC REPLACEMENT 11 gt 16A 16A 16B 16B 16C 16C 16D Replace the indicated IC s designated by ROM number one at a time returning to step 1 of functional test after each replacement Continue repeating the functional test replacing IC s until proper display is obtained any other value Replace IC s CRC or ROM s designated by number one at a time returning to Step 1 of functional test after each replacement Continue re
34. 10 FUNCTIONAL TEST PROGRAM CARD C 11 The functional test program is used to check for improperly operating functions and during component level troubleshooting to isolate such malfunctions to a failure in one of the ROM s C 12 listing of this program is given in table C 1 Service Cards Table C 1 Functional Test Program 212 BICI 114 115 RS 116 LE 118 2 40 CH 4 4 ati es 128 ES 121 y 122 122 4424 dei 12 124 cue 217 2 125 IN 4 4 126 427 PES Sel ii D Par 4 815 2554 28 IE pr 2584 124 2 aie 5683 rnan k 019 cSB4 e26 6551 men 82 2762 vu p22 41 4 134 x 22 ESE 175 nens gt Tta Tue d 224 176 ac cen ni 25 ESE ig 21 poc 1 4 2 BER 138 5 827 5581 149 ENS Tu 226 RTA 14 ra 42 145 NY 146 x gt 147 3 rf 146 RELE 692 149 107 594 CLA 156 143 Li y 895 RELE icu 2 T BOF IKT 182 27 GS LOTE ET ffxi ime 14 eee 4 n r_T 295 FRZ 154 STI EE 1 TE wird 4 x 4 Fre 156 CLA 16 RAD id PELI 102 Ri 158 555 Ed 150 PI HP 97 1 8 7 422 173 174 17E diu 176 177 178 178 188 404 ule CHAM 19 192 193 E 154 10E X 19 iH
35. 4 The HP 97 comes complete with each of the follow ing accessories e Carrying Case AC Adapter Recharger Owner s Handbook Battery Pack Printer Paper two rolls Standard Pac Programming Pad 1 15 OPTIONAL ACCESSORIES 1 16 The following items are optional accessories to the HP 97 and as such are sold separately e 82044A Security Cable e 82037A Reserve Power Pack Pocket Card Holder part number 00097 13142 1 1 General Information Table 1 1 HP 97 Function Key Index HP 97 Manual RUN Mode PRGM RUN switch prem ll RUN set to RUN Function keys pressed from the keyboard execute individual functions as they are pressed Input numbers and answers are displayed All function keys listed below operate either from the keyboard or as recorded instructions in a program 1 2 0 Paper advance push button Press to advance paper without printing OFF Power switch IRACE MAN TIT norm Print mode switch Selects printing option IT aun Program mode switch Selects PRGM mode for manual loading of program into calculator or recording upon magnetic card Selects RUN mode for manual operation of calculator loading of program into calculator from magnetic card or recording or loading of data on or from magnetic card Printing Functions PRINT Space advances paper one space without printing PRINT Prints contents of all primary storage registers PRINT stack Prints
36. BTAINED RETURN TO START AFTER EACH REPLACEMENT CHECK FOR SHORTED OR OPEN TRACES DEFECTIVE DISCRETE COMPONENTS ANO REPAIR IF NECESSARY REPLACE REMAINING IC S UNTIL UNIT DPERATES PROPERLY REPLACE IC S UNTI REPLACE IC S UNTIL I GREATER THAN Vos 15 BETWEEN 11 0 AND 8 0 13 0 VDC CHECK CAPACITORS C1 C2 AND DIODES CRA CR7 CHECK CRS C4 AND TRACES BETWEEN ID CHECK FOR OPEN OR SHORTED TRACES REPLACE ONE AT A TIME UNTIL ALL WAVEFORMS ARE CORRECT ACT CHECK WAVEFORMS 41 42 SYNC RCD AND STR 50 EARS RETURN TO START AFTER EACH REPLACEMENT NECESSARY REPLACE REMAINING IC S UNTIL UNIT OPERATES PROPERLY Figure 4 8 Logic PCA Troubleshooting Flowchart 4 13 4 14 97 Table 4 6 Logic Printed Circuit Assembly 1 00097 60001 Replaceable Parts TM REFERENCE HP PART DESIGNATION NUMBER DESCRIPTION CI 2 3 0180 0575 CAPACITOR fxd 2 2 uf CA 0180 2615 CAPACITOR fxd 22 uf 5 0160 3995 CAPACITOR fxd 3900 pf C6 0180 2602 CAPACITOR fxd 47uf CRI thru CR4 1901 0704 DIODE silicon CR5 thru CR7 10 1901 1098 DIODE silicon CR8 1902 1324 DIODE zener CR9 1902 1314 DIODE zener R3 7 0683 1025 RESISTOR fxd 1K 5 R4 0683 2215 RESISTOR fxd 220 ohm R5 0683 1525 RESISTOR fxd 1 5K 5 0683 1515 RESISTOR fxd 150 ohm 0683 1035 RESISTOR fxd 10K 5 0683 3915 RESISTOR fxd 390 ohm 0811 1674 RESISTOR fxd 4 7 ohm
37. D DOES EACH MEASURE gt 90 YES no REPLACE APPROPRIATE TRANSISTOR PACK U3 AND OR U2 UNTIL ALL MEASURE gt 9 0 2 SWITCH CALCULATOR ON PRESS PAPER ADVANCE SWITCH UNIT SHOULD ADVANCE PAPER PRESS 888 88 sci 9 PRINT X MEASURE PRINT LENGTH SEE NOTE2 CHECK PIN 5 OF BOARD FWD 1 5 millisecond SIGNAL U1 R1 AND R2 YES DOES IT REVERSE TROUBLESHOOT 013 TURN CALCULATOR OFF MEASURE RESISTANCE ACROSS MOTOR 10 10 TURN CALCULATOR PRESS 0 1 9 PRINT X CHECK FOR ACCEPTABLE PRINT INTENSITY MEASURE US PIN 1 FOR 1 0 10 025 YES REPLACE OROER US U4 UNTIL 15 millisecond SIGNAL APPEARS PRESS PAPER ADVANCE SWITCH HEAD SHOULD MOVE FORWARD TROUBLESHOOT 014 1 Ut OR 013 R1 AND R2 TROUBLESHOOT IN ORDER U4 R4 THROUGH R7 SELECT R7 FOR CORRECT LINE LENGTH SEE NOTE 2 CHECK STB SIGNAL PIN 17 OF BOARD 100 microseconds 15 microseconds MEASURE US PIN 2 95 0 05 Vide CHECK REFERENCE VOLTAGE AT U5 PIN 1 1 0 10 025 Vde HEAD CARRIER SHOULD NOT HIT LEFT HAND WALL REPLACE US AND OR SELECT VALUE OF R8 FOR ACCEPTABLE PRINT INTENSITY SEE NOTE 1 PRESS PAPER ADVANCE SWITCH UNIT SHOULO MOVE FORWARD TROUBLESHOOT U2 R4 CHECK HOME SWITCH ALIGNMENT TROUBLESHO
38. FREON Holding Nest HP 97 Card Reader Installation Tool HP 91 97 Field Service Connector Tool Sequence PROM Assembly Fold Apart Tester Automatic Tester Option Test System Mainframe Program Memory Test Program Card Functional Test Program Card Data Card 1 Data Card 2 Diagnostic Test Program Card 3 1 Assembly Level Maintenance HP 97 Table 3 1 Individual Key Sequence Tests Switch the calculator ON Perform the indicated keystrokes Compare the calculator display to the entry under DISPLAY and PRINT To check more than one operation or set of related operations switch the calculator OFF and then ON before entering the next key sequence OPERATION KEYSTROKES DISPLAY 5 5 0 00 5 00 25 00 0 20 5 00 5 00 NTER Gu 5 00 In 2 7 00 218 3 00 2 10 00 MED 2 9 2 50 0 0000 1 23 123 00 1 23 1 5 00 0 40 5 00 12 3456 12 35 12 3500 5 00 4 2 12 00 4 Frac 0 34 120 00 3 14 o B 9 00 ENTER 7 9 170 13 33 0 79 57 30 0 50 30 00 0 50 60 00 1 00 45 00 1 00 1 00 0 50 digit entry oO re GIO g e 9 9 aBBBBB SPERE Bg B 2 8 20500 gt good gg C NO 5 9 5 00808 AB E E Br 5 5 00 gone 008 o Ir En En E sta m 55 Fac
39. H TO PRGM MODE 1 IF KEYCODE CONSISTS OF 2 DIGITS PRESS OPERATION KEY 2 IF KEYCODE CONSISTS OF 4 DIGITS PRESS FOLLOWED BY OPERATION KEY 3 IF KEYCODE CONSISTS OF 6 DIGITS PRESS 2 OPERATION KEYS FOLLOWED BY 1 REPLACE ONE AT REPLACE ONE AT A TIME RETURNING A TIME RETURNING TO START AFTER TO START AFTER EACH REPLACE 6 EACH REPLACE MENT 6 KEYCODE MENT THE ROMS ROM 2 ROM 0 AND INDICATED UNDER CORRECT ROM 1 UNTIL 2 ROM FAILURE CORRECT DISPLAY UNTIL CORRECT PRINTOUT OR DISPLAY PRINTOUT KEYCODE IS IS OBTAINED OBTAINED Figure 4 1 Faulty Function Verification and Repair HP 97 Component Level Maintenance HP 97 Table 4 1 Faulty Function Repair ROM FAILURE PRINT KEYCODE KEYSTROKES DISPLAY OPERATION N fe 5 Gum s GNED 2 63 0 0 O amp gs 0 2 3 ES 5 zn 2 8 5 6037 2 5 4 2 63 552 s Ed 5 5 21 20 2 0 2 3 Ez 6 o SHuucegBBBHB OOO noa x 0 e 6 02021030 e AM TE appe HE Y B g c ul 2 u 20008 3 4 Frac 6 22 9 9 5 5 5 55 WM E ofl 3 0 3 0 3 0 83 1 3 0 1 3 0 5 8 3 5 3 5 Q S 3 S C CJ CJ 0 gt 5 e 555991515 J 9 CJ
40. Index 1 3 1 3 Specifications nearen 1 5 3 1 Individual Key Sequence Tests 3 2 3 2 Initial Test cit Kan 3 5 3 3 Program Memory 3 6 3 4 Functional Test 3 6 3 5 Keyboard Test 3 8 3 6 Diagnostic 3 9 41 Faulty Function Repair 4 3 4 2 Initial Test 4 7 4 3 Functional Test 4 9 4 4 1 Replacement Calculator Halted or Looping 4 11 4 5 IC Replacement Error Display 4 11 4 6 Logic PCA Al Replaceable Parts 4 15 Table 4 7 4 8 4 9 4 10 5 1 6 2 6 3 B 1 1 2 Title Page Printer A4A1 Replaceable Parts 4 21 Cathode Driver Resistor Selection Chart 4 22 Keyboard A2A1 Replaceable Parts 4 23 Card Reader A3A1 Replaceable Parts 4 25 AC Adapter Rechargers 5 1 HP 97 Replaceable Parts 6 1 Keyboard Assembly A2 Replaceable Parts 6 3 Printer Assembly A4 Replaceable Parts 6 4 Card Reader Assembly A3 Replaceable Parts 6 6 Reference Designations and Abbreviations B 2 Functional Test Program 2 D ta Zo viii ELE C 3 Diagnostic Test Program
41. NCTIONAL TEST can be erased at the same time and all labeled data card 1 for use in later repairs 4 17 run the functional test follow the step by step III a working procedures shown in table 4 3 b Switch to PRGM mode c Feed both sides of data card 1 through the card reader 4 18 When the indicated display is not obtained replace IC s CRC PIK or ROM s designated by number one 4 20 Steps 16A 16B and 16C are checkpoints to at a time After each replacement return to step 1 of the identify the point at which the functional test program halts functional test and reiterate replacing the indicated IC s until or begins to loop endlessly This location is needed to isolate the proper display is obtained the probable ROM failure as given in table 4 4 The numbers are aisplayed only to indicate these checkpoints and 4 19 Before using data card 1 in step 12 erase it using need not be checked for accuracy this is done internally the following procedures to save time a number of cards by the functional test program 4 8 97 Component Level Maintenance STEP 1 Table 4 3 Functional Test IC Set switches OFF TRACE MAN NORM PRGM 2 Press 0 00 3 Read side 1 of functional test card Crd 4 Read side 2 of functional test card 0 000000000 00 5 Switch to PRGM mode 0 00 6 Press 224 24 7 Press 001 00 8 Press 000 9 Press a 001 2
42. OF ONOSCILLOSCOPE 2 FEED DIAGNOSTIG TEST 3 SWITCH TO PRGM MODE 4 FEEO BLANK CARD ERROR DISPLAYED SEE yes TRACKS 7 CHECK TRACES NO 1 REPLACE ROM 6 2 READ SIDE 1 OF OATA CARD 2 ARE WA AND WB CORRECT NOTE 2 REPLACE CRC 15 ERROR DISPLAYED REPLACE SENSE AMP 5 NOTES SWITCH TO RUN MODE REPLACE R1 WITH 1 IF TESTER DOES NOT LIGHT CLEAN REPLACE R wiTH FEED DATA CARD 2 CONTACTS WITH INK ERASER NEXT LARGER NEXT SMALLER CHECK TRACES FEED BLANK CARO RESISTOR SEE RESISTOR SEE PONENTE DIP CARD IN MAGNA SEE 2 WA AND WB SHOULD BE RECTANGULAR TABLE 4 10 TABLE 4 10 WAVEFORMS WITH AMPLITUDE AT LEAST 6V SEE FIG 4 25 3 IF THESE PROCEEDURES CANNOT BRING THE LENGTH OF THE TRACTS WITHIN YES THE PROPER LIMITS REPLACE AND OR ADJUST THE AS DESCRIBED IN PARAGRAPH 4 40 SEE BOTH TRACKS gt 4 RA AND SHOULD RECTANGULAR kai WAVEFORMS WITH AMPLITUDE OF AT LEAST 3 0 VDC SEE FIG 4 26 Figure 4 29 Card Reader Troubleshooting Flowchart Continued 4 27 4 28 SECTION V Accessories 5 1 INTRODUCTION 5 2 This section identifies the accessories available for use with the HP 97 Replacement is recommended except at facilities where repair is feasible 5 3 BATTERY PACK 5 4 Figure 5 1 shows the HP 82033A battery pack A checkout
43. OF DIGITS SHORTED REPLACE LOGIC PCA AND OR KEYBOARD PCA RUN FULL OPERATIONAL TEST SEE PARA 39 DRAIN RAPID YES PRESS NOTE PRINTER OUTPUT SHOULD BE 8 88888888 88 CHECK FOR ACCEPTABLE PRINT INTENSITY lt gt BETWEEN Vian AND YES CALCULATOR REPAIRED CONNECT LOAD ACROSS OUTPUT LJ Mil AS SHOWN V BETWEEN MEASURE VOLTAGE 6 2 AND ACROSS LOAD 7 4 REPLACE AC ADAPTER RECHARGER Ve 10 OHMS gt 5 SW INSPECT CALCULATOR FOR MECHANICAL DAMAGE PRESS ALL KEYS CONTACTS REMOVE BATTERY PACK CLEAN BATTERY READ DATA CARD 2 CHECK FOR THE FOLLOWING ERROR DISPLAYED CARD READER MOTOR NOISY MOTOR DOESN T TURN ON MOTOR TURNS ON BUT CARD DOESN T FEED CARD FEEDS BUT IS NOT READ CORRECTLY CARD IS NOT WRITTEN ON CORRECTLY CARD WITH CUTOFF CORNER IS OVERWRITTEN CARD STICKS IN CARD READER CARD READ OK NO HP 97 YES 97 Assembly Level Maintenance ER 1 RETURN KEY BOARD 3 REPLACE CARD READER RUN FULL OPERATIONAL TEST BEE PARA 9 ves FEEL 1 RETURN SPACERIS REPLACE SWITCH CONTACTS 1 RETURN LOGIC RETURN PRINTER ASSEMBLY 2 REPLACE KEY BOARD UNLESS REPLACED IN A PREVIOUS PROCEDURE Figure 3 1 HP 97 Assembly Level Trouble
44. ONTACTS WITH INK ERASER Figure 4 29 Card Reader Troubleshooting Flowchart 4 26 CHECK TRACES CLEAN SWITCH CONTACTS AND PADS ON CARD READER PRINTED CIRCUIT BOARD WITH INK HP 97 ERASER 97 Component Level Maintenance CONNECT CONTINUITY TESTER BETWEEN GROUND AND WRITE PROTECT SWITCH E TEST POINTS TURN SCREW ON WRITE PROTECT SWITCH CONTACT SEE FIG 4 24 CLOCKWISE UNTIL TESTER LIGHTS THEN TURN COUNTERCLOCKWISE Y TURN SEE NOTE 1 REPLACE ROM 6 MONITOR WPS PIN OF CRC WITH VOLT METER OSCILLOSCOPE CONNECT CONTINUITY TESTER BETWEEN GROUND AND HEAD SWITCH H TEST POINTS TURN SCREW ON HEAD SWITCH MONITOR RA AND RB PINS OF CRC ON OSCILLOSCOPE READ SIDE DATA CARD 2 CONTACT SEE FIG 4 24 CLOCKWISE UNTIL TESTER LIGHTS THEN TURN COUNTER CLOCKWISE TURN SEE NOTE 1 REPLACE SENSE READ SIDE 1 OF DATA CARD 2 FEED DATA CARD 2 PRESS Al FEED BLANK CARD DIP CARD IN MAGNA SEE FEED DATA CARD 2 PRESS g wom FEED BLANK CARO DIP IN MAGNA SEE SEE BOTH TRACKS YES o NO 1 PRESS g SEE 2 FEEO SIDE 2 OF SEE BOTH YES DATA CARD 2 REPLACE CRC TRACKS REPLACE HEAD ASSEMBLY NO REPLACE CRC READ SIDE 1 OF FEED DATA CARD 2 DATA CARD 2 PRESS FEED BLANK CARD DIP CARD IN MAGNA SEE 1 MONITOR WA WB AND WE PINS
45. OT IN ORDER U4 US AND RB Component Level Maintenance CHECK LINE TO LINE LINE LENGTH UNIFORMITY NOTE 1 FOR DARKER PRINT INCREASE RESISTANCE SEE TABLE 4 7 FOR LIGHTER PRINT DECREASE RESISTANCE 2 PRINTED LINE LENGTH AT 5 70 VOLTS SHOULD BE 1 47 TO 1 54 INCHES 3 73 TO 3 91 CM MEASURED FROM A POINT 0 33 INCHES 0 84 CM FROM RIGHT HAND WALL FOR LONGER LINE DECREASE RESISTANCE SEE TABLE 4 7 FOR SHORTER LINE INCREASE RESISTANCE YES Figure 4 18 Printer PCA Troubleshooting Flowchart 4 19 4 20 97 Table 4 7 Printer Printed Circuit Assembly 4 1 Replaceable Parts REFERENCE DESIGNATION 1 C3 C4 R7 R7 R7 R7 R7 R8 R8 R8 R8 R8 R8 R8 Q13 14 01 2 3 U4 05 L1 thru J6 J7 Values of R7 and R8 are selected HP PART NUMBER DESCRIPTION 0160 4292 CAPACITOR fxd 330 pF 596 0180 2602 CAPACITOR fxd 47 uF 20 0160 3456 CAPACITOR fxd 1000 pF 10 0683 2015 RESISTOR fxd 200 ohm 5 0698 3155 RESISTOR fxd 4 64K 1 0683 4725 RESISTOR fxd 4 7K 5 0698 3157 RESISTOR fxd 19 6K 1 0757 0288 RESISTOR fxd 9 09K 0698 4474 RESISTOR fxd 8 45K 1 0757 0751 RESISTOR fxd 7 50K 1 W 0698 3226 RESISTOR fxd 6 49K 1 0757 0200 RESISTOR fxd 5 62 1 W 0698 4444 RESISTOR fxd 4 87K 1 0698 3154
46. RFORMING A FUNCTION 2 11 Before a key is pressed the ACT is continually asking has a key been pressed If the ACT is not tied up in controlling a calculation and a key has been pressed it will service that key code and the display will return The display is blanked out during printing to conserve power 2 12 ACT services a key code by first requesting the key code corresponding to the key that was pressed from the PIK The PIK returns that code to the ACT via the DATA line The ACT finally will put the address code on the instruction address 15 bus This address goes to the ROM s that will now send back to the ACT the specific instructions of how to perform that function and at the same time instruct the PIK as to what function to print The ACT will then perform that function on the numbers in the display the printer will print when the print mode switch is set to TRACE the function name and the result of that operation O C HP 97 2 13 TIMING 2 14 The ACT circuit produces two signals for timing purposes SYNC for the ROM s PIK and CRC and RCD for the PIK and cathode driver Along with the connection through the SYNC line the ACT is connected to the ROMs by the I instruction address bus The Is bus instructs the data storage IC to store data sent on the data line from the ACT and to send data back to the ACT on the same DATA line Figure 2 5 shows the timing relationship b
47. RY OF OPERATION 4 21 Printer Assembly Maintenance 4 16 4 24 Printer Mechanical Maintenance 4 16 2 1 HP 97 2 1 4 26 Printer Electrical Maintenance 4 17 2 3 Display 2 2 4 28 Keyboard Troubleshooting 4 22 2 10 Performing a 2 2 4 30 Display Troubleshooting 4 22 2 13 Timing 2 3 4 33 Cathode Driver IC Replacement 4 22 2 17 Printer ta 2 3 4 35 Card Reader Troubleshooting 4 24 2 22 Print Head Drivers 2 3 2 24 Printer Motor Control 2 3 ACCESSORIES 2 29 Print Intensity Control 2 4 5 1 I pace 2 32 Card 2 4 i E 5 1 2 37 Power Inverter 2 4 2 ACORN 2 2 41 Battery Charging 2 5 NES MANE OE ya x Das ron 55 5 12 82044A Security Cable and Lock A M C VEM E ee 5 13 HP 82037A Reserve Power Pack 5 2 i ASSEMBLY LEVEL MAINTENANCE VI REPLACEABLE PARTS 3 1 Introduction 3 1 3 6 Recommended Tools and Fixtures 3 1 6 1 Introduction 6 1 3 7 Individual Key Sequence Tests 3 1 6 5 Ordering Information QR Bu
48. any sharp bends in the head cable motor leads or reed and out of paper switch leads Do not bend or scratch any printer parts To do so would degrade printer performance Figure 4 11 Printer PCA Lead Location Disconnect the head cable from the printer PCA by inserting the small end of the connector tool into the head connector positioned between the connector pins and the cable and pulling out on the cable See figure 4 12 To reinsert the cable place the connector tool in the fold of the cable and carefully insert them together into the connector with the fold facing the circuit side of the board see figure 4 13 Ensure that the cable con Figure4 12 Print Head Cable Removal HP 97 tacts are properly aligned with the connector contacts as shown in figure 4 14 Remove the connector tool Figure 4 13 Print Head Cable Insertion Figure 4 14 Print Head Cable Contacts d Visually inspect the unit for 1 Worn or defective gears 2 Broken bent leads 3 Stretched or missing springs Component Level Maintenance 4 Excessive lead screw end play 5 Excessive play in the paper advance assembly Replace any worn or defective parts f When reassembling the printer be sure to lubricate the four points indicated in figure 6 2 g Test the home position reed switch 1 Manually rotate the lead screw until the head car riage is positioned near but not touching the right hand wall as show
49. ber and keycode of current program memory step when pressed executes instruction displays result and moves calculator to next step when released After E prefix key cancels that key After other keys does nothing Does not disturb program memory or calculator status Run stop Begins execution from current step of program memory Stops execution if program is running Any Key Pressing any key on the keyboard stops execution of a running program Executed as a recorded program instruction Go to Followed by label designator y through B through o through s or causes calculator to stop execution search through program memory to first desig nated label and resume execution there Go to subroutine Followed by label designator E through Ell through 18 through 9 or causes calculator to search through program memory to first desig nated label and execute that section of program memory as a subroutine Return If executed as a result of pressing a label designator or execution of a instruction stops execution and returns control to keyboard If executed as a result of a instruction returns control to next step after the instruction Stops program execution and transfers control to keyboard for 1 second then resumes program execution Conditionals Each tests value in X register against O or value in Y register as indicated If true calculator executes
50. d the parts comprising them can be ordered individually using the part numbers given in the appropriate section IV table Table 6 1 HP 97 Replaceable Parts FIGURE amp INDEX DESCRIPTION QTY NUMBER 6 1 1 00097 60001 PCA Al logic refer to table 4 6 1 2 ASSEMBLY A2 keyboard refer to table 6 2 1 3 00097 60004 ASSEMBLY card reader refer to table 6 4 1 4 00097 60010 ASSEMBLY A4 printer refer to table 6 3 1 5 ASSEMBLY AS bottom case 1 00091 60013 e ASSEMBLY power pack 1 5040 9204 e DOOR battery 1 5040 9440 e LATCH battery door 2 0460 1218 battery door 1 5040 9202 e CASE bottom 1 5040 9207 e FOOT 4 6 ASSEMBLY A6 support plate 1 5040 9206 e PLATE support 1 0363 0067 e CONTACT battery 2 1600 0525 e HASP security 1 0624 0354 e SCREW 4 20 x 0 5 2 3050 0227 e WASHER 0 149 ID 2 7 ASSEMBLY top case 1 5040 9709 e CASE top 1 00091 60016 e ASSEMBLY paper advance switch 1 1460 1465 e SPRING compression 1 5040 9213 e BUTTON paper advance switch 1 00097 60008 ASSEMBLY recharger pin holder 1 5040 9208 COVER paper 1 2190 0891 WASHER 3 0400 0009 GROMMETT vinyl 3 0624 0354 SCREW 4 20 x 0 5 20 0624 0355 SCREW 4 20 x 0 375 8 6 1 HP 97 Replaceable Parts Figure 6 1 HP 97 Exploded View 6 2 00097 60002 00097 60013 5040 9229 4040 1054 4040 1086 5020 9230 5020 9233 1460 1465 1460 1487 5040 9210 5040 9300 5040 9209 1460 1471 7120
51. d is mechanically moved across the paper by a lead screw mechanism see figure 6 2 By passing current through the appropriate head resistor at the correct time as the head moves across the paper characters are thermally printed 2 21 Notice the slight slant of each character This is done to decrease instantaneous current demands The printer interface and keyboard buffer PIK is responsible for this operation The PIK also controls print intensity line width and motor movement commands C C JE 1 Printed ONE EA C 1 TJ Head moves right to left while printing Figure 2 7 Printed Character 2 22 Print Head Drivers 2 23 Each head resistor requires approximately 0 5A of current to adequately print on the heat sensitive paper NPN transistors Q1 through Q7 act as current amplifiers to supply the head resistors with the required current and also lessen the drive requirements from the PIK 2 24 Printer Motor Control 2 25 small dc motor provides the mechanical power through the action of the lead screw and gears to move the print head Current for the motor is controlled by the on and off action of six driver transistors Q9 through Q14 2 26 When the PIK gives the comand to move forward transistors Q11 Q14 and Q9 tum on Transistors O12 Q13 and Q10 tum on to reverse the direction of head travel 2 27 Braking action is produced by shorting the dc motor windings when 08 is t
52. eading to an error display are listed in appendix A 1 5 DESCRIPTION 1 6 The HP 97 is a fully programmable desktop printing calculator Mechanically the HP 97 is essentially similar to the HP 91 with the addition of a card reader 1 7 COMPATIBILITY 1 8 The HP 97 is compatible with the HP 67 programs recorded on a magnetic card from an HP 67 can be loaded into and executed on an HP 97 and vice versa 1 9 Programs recorded on a magnetic card from an HP 65 cannot be loaded into an HP 97 however most pro grams written for an HP 65 can be manually entered into an HP 97 via the keyboard 1 10 IDENTIFICATION 1 11 The serial number of the calculator is used for identification and warranty determination It is located just above the battery door as the bottom of the calculator faces you The format is described below Calculator Identification 1503A 12345 Sequence number A USA Brazil S Singapore Month manufactured Year manufactured 1960 15 1975 1 12 serial numbers located on the battery and on the ac adapter recharger are used to determine the week the unit was fully charged and the date of manufacture respec tively The format for each is described below Battery Charge Date i x Week of charging Year of charging 1960 15 1975 AC Adapter Recharger Manufacture Date 1512 1 Month manufactured Year manufactured 1960 15 1975 1 13 STANDARD ACCESSORIES 1 1
53. ensity 2 32 CARD READER 2 33 When a card is inserted into the card reader the motor switch is closed grounding the MTRS signal This signal is fed to the CRC which tells the microprocessor contained in the ROM s and ACT that a card is in the card reader The microprocessor in response tells the CRC to turn on the card reader motor The CRC then grounds the MOTOR signal to the sense amp which supplies power to the motor The motor turns a roller which passes the card through the card reader 2 34 When the leading end of the card reaches the card reader head the head switch is closed grounding the HDS signal For a read operation flux transitions on the card are picked up by the head amplified and converted to digital levels by the sense amp buffered by the ACT and then pass ed to the appropriate data storage registers For a write operation this process is reversed The microprocessor informs the CRC whether the operation is a read or write 2 35 Information is recorded as a flux transition onto two tracks on each edge of the card A header at the beginning of both tracks indicates whether the information on the card is a program or data If the card contains a program this header also contains flag and display format information and indicates whether side 1 or side 2 of the program is being read written At the end of the tracks is a checksum which is used by the microprocessor to check for errors in reading If an error
54. es for extended periods keep in box or appropriate container 1 5 1 6 SECTION II Theory of Operation 2 1 HP 97 LOGIC e PIK printer interface and keyboard buffer 2 2 main functional components of the HP 97 as f Printer assembly shown in figure 2 1 are g ROM s read only memories a Display h Anode buffers b Power inverter i Cathode driver c Keyboard j CRC card reader chip d ACT arithmetic control and timing k Card reader assembly DATA ROM 6 DATA ROM 5 Cathode Driver Printer Assembly Power Inverter doo Figure 2 1 HP 97 Block Diagram 2 1 Theory of Operation 2 3 DISPLAY 2 4 The display consists of a 15 digit light emitting diode LED module plus a low battery indicator which are controlled in part by each of the following components a ACT b c Anode buffers d Cathode driver 2 5 Each digit consists of seven LED segments with an additional segment for the decimal which makes eight segments sequentially lettered a through h as shown below Figure 2 2 LED Digit 2 6 Since the display is a scanned diode array both its anode and cathode must be driven in order for the segment to light All cathodes of each digit are tied together as shown in figure 2 3 When a cathode driver transistor is turned on any segment of that digit may light the segment that lights will now be determined by which anode driver tran
55. etween the SYNC DATA and 15 pulses INSTRUCTION DISPLAY ADDRESS INSTRUCTION DISPLAY 1 Figure 2 5 Timing Diagram 2 15 Inaddition to being used to synchronize the system SYNC is also used to gate the 10 bit instruction that appears on 15 at bit times 146 through tss During this time SYNC distinguishes instructions from addresses Following an instruction on Is bus the subsequent SYNC pulse is suppressed to allow a 10 bit address to be sent on the Is bus 2 16 At bit times tis through 67 the Ig line carries 12 bit instruction address from the ACT to the ROM while display information is carried from the ACT to the ROM during bit times to through t At bit times to through tz a digit is carried from the ACT to the ROM s for decoding and dis play On the following word time the next digit is sent out Sign decimal point and blanking information for the num ber is carried to the ROM during bit times t through t 2 17 PRINTER 2 18 printer used in the HP 97 employs a very hot source print head resistors in close contact with heat sensitive paper This paper changes color in the area of heat contact I 2 19 The print head contains seven small resistors each about 10 ohms that heat up when current is passed through them Figure 2 6 shows the print head and resistors Resistors Common Figure 2 6 Print Head Theory of Operation 2 20 The hea
56. evious steps as indicated g Support plate assembly removal h Card reader assembly removal replacement i Keyboard printed circuit assembly removal 3 26 For a list of replaceable assemblies refer to i tri d slid itch t section VI To reassemble the HP 97 follow the removal CLE replacement procedures reverse order removal k Key and key spring replacement replacement procedures are given in the following order l Paper advance switch assembly replacment Battery Pack Removal Lay the calculator upside down in a support fixture part number T 155321 While grasping the sides of the calculator place each thumb firmly over the ridged door latches as shown Slide both latches inward with thumbs until they click Assembly Level Maintenance HP 97 Place one hand under the calculator on the keyboard and the other hand over the battery door Rotate the calculator to the face up position and allow the battery door and battery pack to fall into your hand Battery Door Latch Removal Replacement Perform removal step 1 Lift inside tab over ridge and slide latch out To replace latch slide latch into slot until it snaps over ridge Bottom Case Assembly Removal a Perform removal replacement procedure 1 b Remove the six Phillips screws as shown c Lift off bottom case c Firmly press in new feet while being careful not to damage bottom case
57. f x and y values accumulated by B s Computes sample standard deviations of x and y values accumulated by EB Flags Set flag Followed by flag designator 0 1 2 or 3 sets flag true Clear flag Followed by flag designator 0 1 2 or 3 clears flag 97 General Information Table 1 1 HP 97 Function Key Index Continued Trigonometry Converts decimal hours or degrees in displayed X register to hours minutes seconds or degrees minutes seconds Converts hours minutes seconds or degrees minutes seconds in displayed X register to decimal degrees Adds hours minutes seconds or degrees minutes seconds in Y register to those in X register Computes arc sine arc cosine or arc tangent of number in displayed X register EN Computes sine cosine or tangent of value in displayed X register Converts degrees to radians Converts radians to degrees Sets decimal degrees mode for trigonometric functions Sets radians mode for trigonometric functions Sets grads mode for trigonometric functions PRGM RUN switch set to Pram All function keys except the ones below are loaded into program memory when pressed Program memory contents recorded upon magnetic card when card passed through card reader Active keys In PROGRAM mode only six operations are active These operations are used to help record programs and cannot themselves be recorded in
58. g the ac adapter recharger into a wall outlet 5 24 red light LED will glow when the proper connections have been made and the batteries are charging The light does not go out when charging is complete 332 5 5082 4850 Ri CR2 115 230 12 8Vac 1901 0704 R2 120 2W 5 Figure 5 10 Reserve Power Pack Schematic Diagram 5 3 5 4 SECTION VI Replaceable Parts 6 1 INTRODUCTION 6 2 This section contains information pertaining to the parts used in the HP 97 Parts descriptions quantities HP stock numbers reference designations where appli cable and assembly breakdowns are given 6 3 Symbols used in the schematics may be identified by using figure B 1 Table B 1 lists reference designations and abbreviations 6 4 Replaceable parts for the logic PCA printer PCA keyboard PCA and card reader PCA are listed for con venience alongside each appropriate schematic diagram in 6 5 ORDERING INFORMATION 6 6 To order replacement assemblies address order or inquiry to Corporate Parts Center Parts Center Europe or International Operations Specify the following information for each part ordered a Calculator model and serial number b Hewlett Packard stock number for each part c Description of each part d Circuit reference designation if applicable 6 7 Assemblies listed without an HP part number are named for reference only and cannot be ordered as assembled units If neede
59. he HP 82037A Reserve Power Pack a Allows spare battery recharge while calculator is in use b Isespecially useful where calculator is in constant field use Figure 5 9 Reserve Power Pack 97 f Attaches to standard ac adapter recharger Built in indicator shows battery is charging Uses standard battery pack one supplied Allows charging extra packs for extended usage of calculator Provides extra portability around the user s facility 5 16 Specifications 5 17 The following are specifications for the HP 82037A Reserve Power Pack a Dimensions length 4 63 inches width 3 81 inches height 1 38 inch Weight 3 ounces including battery pack Material High impact plastic Battery Charging Indicator Light emitting diode LED Temperature Operating Range 15 to 40 C 59 to 104 F Power Input From ac adapter recharger Accessories 5 18 Service Support 5 19 Complete replacement is recommended 5 20 Conditions of Replacement or Repair 5 21 Replace plastic parts if cracked or broken If unit is damaged beyond repair consider a replacement unit Note Keep in mind repair cost versus that of a new unit 5 22 Operation 5 23 Guide battery pack into reserve power pack so that the exposed metal battery contacts face the metal contacts in the reserve power pack Plug the two prong female con nector from an ac adapter recharger into the bottom of the reserve power pack Then plu
60. ich is located on the logic PCA is included in the logic PCA troubleshooting flowchart figure 4 8 Continuity Tester Lubricant Desoldering Tool Desoldering Tool Tip Soldering Iron Soldering Iron Stand X acto Knife X acto Knife Blade Tweezers Needle Nose Pliers Small Flat Blade Screwdriver Phillips Screwdriver T F FREON MAGNA SEE Holding Nest HP 91 97 Field Service Connector Tool HP 67 97 Field Service Card Speed Gauge Sequence PROM Assembly Fold Apart Tester Automatic Tester Option Test System Mainframe Oscilloscope Measures pulse at 0 50us Maximum amplitude 13 Vdc Power Supply Variable supply rated at 10 Vdc at 5A Add a 0 1 uf ceramic capacitor across output terminals Multimeter Accurate to 0 01 Vdc Oscilloscope Probe Ink Eraser Retaining Ring Applicator 1 16 Retaining Ring Applicator 3 32 Program Memory Test Program Card Functional Test Program Card Data Card 1 Data Card 2 Diagnostic Test Program Card 4 1 Component Level Maintenance 4 8 FAULTY FUNCTION VERIFICATION AND REPAIR 4 9 To verify and repair if necessary a suspected faulty function on the HP 97 follow the procedures of figure 4 1 which refers to table 4 1 SET SWITCHES orr TRACE PRESS KEYS INDICATED FOR DESIRED OPERATION SEE TABLE 4 1 15 SWITCH DISPLAY PRINTOUT CALCULATOR CORRECT 2 SWITC
61. instruction in next step of program memory If false calculator skips one step before resuming execution If flag true Followed by flag designator 0 1 2 or 3 tests designated flag If flag is set true the calculator executes the instruction in the next step of program memory If flag is cleared false calculator skips one step before resuming execution clears flags F2 and F3 after test Run stop Stops program execution HP 97 D Noi 97 Table 1 3 Specifications Calculator Dimensions e Length 8 0 inches 20 3 centimeters e Width 9 0 inches 22 9 centimeters e Height 2 5 inches 6 35 centimeters Weight e Calculator with battery pack 40 ounces 1 13 kilograms US Recharger 5 ounces 155 grams Power e Rechargers HP Part Number United States 82040A 90 127 Vac 50 60 Hz 7 watts Australian 82039 A 200 254 Vac 50 60 Hz 7 watts European 82043 A 90 127 Vac 50 60 Hz 7 watts 82031 A 200 254 Vac 50 60 Hz 7 watts Desktop 82032A 200 254 Vac 50 60 Hz 7 watts e Battery Four cell 4 4 to 6 0 volts quick charge nickel cadmium battery pack e Operating time 3 to 7 hours Note Battery must be in place to operate the calculator e Recharging time 7 to 10 hours calculator OFF 17 hours calculator ON Display e Rounding to last displayed digit Internal operations are calculated with 10 digits e Numeric and decimal point Eight segment light emitting di
62. ircuit assembly Support Plate Assembly Removal Perform removal replacement procedures 1 3 5 and 6 Remove the seven support plate retaining screws Lift off support plate Lift off paper cover RED HP 97 e Card Reader Assembly Removal Replacement a Perform removal replacement procedures 1 3 and 5 through 7 b Remove the three Phillips screws indicated and lift the card reader assembly off the support plate To replace the card reader assembly first remove the card reader cable using the connector tool as in step 6b Place the card reader installation tool part number T 155239 into the card reader cable slot as shown Place the card reader assembly onto the support plate straddling the tool as shown and insert screws into the slots of the three feet of the card reader support Rotate the card reader assembly clockwise to position the two feet against opposite sides of the long arm of the tool Tighten the three screws while holding the card reader assembly in the position described in step f Insert the card reader cable into the connector as in step 6b Assembly Level Maintenance Assembly Level Maintenance Keyboard Printed Circuit Assembiy Removal Perform removal replacement procedures 1 3 5 6 and 7 top case Apply light upward pressure to top case as shown Press inward on red display window to separate from d Remove the two keyboard support screws NOTE Be carefu
63. l not to bend the connector and plastic e guide pins that are located on the bottom Lightly press outward on the keyboard and remove CAUTION Do not put any sharp bends in the display cable as it may fracture and break Spacers Spring Strips and Slide Switch Replacement Perform removal replacement procedures 1 3 5 6 7 and 9 Remove the seven Phillips retaining screws Carefully lift off circuit board att 3 14 97 97 Assembly Level Maintenance Note position of guide pins and holes for the next operation E ca w w wq w Lift off upper spacers w w Lift off key spring strips Ud A w t lado d ias a mA Lift off lower spacers gt A m replace key spring strips and spacers carefully replace each in reverse order as described above To replace a spring contact or slide switch lift it out with a tweezers or needle nose pliers as shown When replac ing a spring contact clean it with FREON and apply a small amount of Silicone lubricant in the places indi cated Rei pet ed Pe end foi Hat Key and Key Spring Replacement Push key to be replaced so that hat is elevated Pull off hat and allow key and key spring to fall out To replace align key and spring properly then push the hat onto the key stem until it snaps into place Paper Adva
64. lex calculator C 3 Fortunately this inherent sophistication enables the calculator effectively to perform diagnostic troubleshooting upon itself with the aid of suitable programmed procedures Use of them will expedite the diagnostic process of isolating a calculator malfunction to a particular IC failure C 4 The following magnetic cards are required to thoroughly check out and troubleshoot the HP 97 a Program memory test program card b Functional test program card c Data card 1 d Data card 2 e Diagnostic test program card C 5 All five cards are required for assembly level maintenance all but the diagnostic test card are required for component level maintenance of the logic PCA The diagnostic test card and data card 1 which is the blank erased card are required also for component level maintenance of the card reader assembly C 6 These cards should be prepared by writing onto them using either an HP 97 or an HP 67 the program or data given in the remainder of this appendix C 7 PROGRAM MEMORY TEST PROGRAM CARD C 8 The program memory test program is used to check for improper program storage and during component level troubleshooting to isolate this malfunction to a failure in one of two ROM s C 9 The listing of this program is given in figure C 1 below Steps 1 through 222 all contain the instruction ISZI fa 4 amp Figure C 1 Program Memory Test Program C
65. mbers indicated If so proceed to the program memory test paragraph 3 14 if not return to Q on figure 3 1 KEYSTROKE DISPLAY PRINTOUT 8 8 gt 2 gt 8 8 Assembly Level Maintenance Table 3 1 Individual Key Sequence Tests Continued DISPLAY PRINT 5 00 blinking 5 5 00 5 00 0 00 Table 3 2 Initial Test gl o 00 07 76 7 777777777 77 7 777777777 77 0 00 7 777777777 77 1 357478307 78 1 357478307 78 7 777777777 77 7 777777777 77 7 777777777 77 7 777777777 77 7 777777777 77 7 777777777 77 0 00 7 777777777 77 Assembly Level Maintenance HP 97 3 14 PROGRAM MEMORY TEST Table 3 3 Program Memory Test STEP PROCEDURE DISPLAY 3 15 To run the program memory test follow the procedures given in table 3 3 The displays indicated should ore be obtained If so proceed to the functional test paragraph 3 16 if not retum to Q on figure 3 1 Norm PRGM 3 16 FUNCTIONAL TEST Read side of program memory test card Read side 2 of program memory test card Press 3 17 run the functional test follow the step by step procedures given in table 3 4 After each step the indicated display and or printout should be obtained If so assemble the calculator and proceed to the keyboard test paragraph 3 18
66. n connector complete 7 direct current 7 drive 7 diode transistor logic deposited carbon double pole double throw double pole single throw emitter emitter coupled logic external 7 encapsulated 7 electrolytic farads flip flop flat head 7 film fixed fillister head giga 109 germanium glass ground ed 1 0 int incl insul impgrg incand relay inductor meter plug connector semiconductor device other than diode or integrated circuit resistor thermistor switch transformer gray green henries mercury hour s hertz hardware hexagon hexagonal inside diameter intermediate frequency inch inches input output internal include s insulation insulated impregnated incandescent 7 inches per second kilo 103 kilohm low pass milli 103 mega 109 megohm Mylar manufacturer 7 momentary mounting 7 miscellaneous metal oxide miniature nano 109 normally closed or no connection neon number normally open nickel plated 7 negative positive negative 7 negative positive zero zero temperature coefficient not separately replaceable not recommended for field replacement outside diameter order by description 7 orange oval head oxide pico 10 12 7 printed circuit Wow How womm u H H H n H HP 97 terminal board test point integrated circuit non
67. n 5 ES 5 00 blinking C 5 5 s x 8 5 00 Component Level Maintenance 0 1 5 CRC 6 1 3 2 5 6 0 3 1 2 5 6 0 Component Level Maintenance HP 97 Table 4 1 Faulty Function Repair Continued 989 0898 insert data card 1 OFF on OFF insert card again 0 2 PRINT space SPACE 5 GED DO EIE 0 30 GZ 0 653 o 552 O 83 B G o2 B PRGM M RUN 52 B 1 ES EN B 52 PRGM RUN 4 10 LOGIC PCA OPERATIONAL TEST 4 11 This test is used to identify faulty integrated circuits on the logic PCA It is comprised of the following separate tests which should be run in the order shown a Initial test b Program memory test c Functional test 4 12 INITIAL TEST 4 13 To run this test a Set switches as follows orr TRACE Man Norm PRGM 4 6 OPERATION KEYSTROKES DISPLAY KEYCODE ROM FAILURE 6 CRC 3 0 3 0 CRC 35 45 36 45 16 25 46 16 26 46 b Enter the key sequence of table 4 2 After each key stroke compare the number in the calculator display to that in the DISPLAY column If they are not the same one of the ROM s indicated by number in ROM FAILURE column is probably faulty Replace these ROM s in the order indicated after each replacement return to the beginning of the test a
68. n addition checks for proper operation of the card reader 3 23 To run this test follow the procedures shown in table 3 6 If the indicated display or printout is not obtained or if Error is displayed return to P on figure 3 1 If the calculator passes the diagnostic test return to R on figure 3 1 Assembly Level Maintenance Table 3 6 Diagnostic Test PROCEDURE DISPLAY PRINTOUT Set switches 0 TRACE man PRGM 1 RUN STEP 1 2 Read side 1 of diagnostic test card Crd 3 Read side 2 of diagnostic test card 0 00 4 Swtich to PRGM mode 000 5 Feed side 1 of data card 1 Crd 6 Feed side 2 of data card 1 000 7 Switch to RUN mode 0 00 8 Again feed side 1 of data card 1 Crd 9 Feed side 2 of data card 1 0 00 10 Press 9 7 777777770 77 1 467 pause 18 006406 1 008607 xxx 8 888888888 88 3 24 HP 97 ASSEMBLY REMOVAL AND a Battery pack removal REPLACEMENT PROCEDURES b Battery door latch removal replacement c Bottom case assembly removal 3 25 The following procedures describe in detail d Rubber feet replacement removal and replacement of the HP 97 assemblies Follow e Printer assembly removal all directions as given step by step to detach and replace bl 1 any HP 97 assembly In most cases it will be necessary to Pe perform first the pr
69. n in figure 4 15 2 Connect an ohmmeter to the reed switch leads When the head carriage is positioned near the right hand wall as shown in figure 4 15 the ohmmeter should measure less than 1 ohm h Testthe motor for open or shorted windings and or open or shorted C2 Connect an ohmmeter to the dc motor leads If the meter reads less than 9 0 ohms carefully disconnect one lead of C2 and measure again Replace the defective capacitor dc motor assembly if necessary E HOME POSITION Figure 4 15 Head Carriage Home Position 4 26 Printer Electrical Maintenance 4 27 Totestthe electrical portion of the printer assembly follow the procedures as outlined in figure 4 18 4 17 Component Level Maintenance 4 18 STB G p 4 w ao e a Test point FWD Pin 5 of XA1P1 Time base 2 ms cm Vertical gain 1 V cm Figure 4 16 FWD Waveform Test point STB Pin 17 of XA1P1 Time base 20 us cm Vertical gain 1 V cm Figure 4 17 STB Waveform HP 97 48 97 START SWITCH CALCULATOR TO ON DO NOT ATTEMPT TO PRINT UNTIL INSTRUCTED SWITCH UNIT TO ON SLIDE SWITCHES PRINT AND TRIGONOMETRIC MODE TO FAR LEFT DOES UNIT DISPLAY 0 00 YES REPLACE 11 AND OR cet SWITCH CALCULATOR TOOFF CONNECT WORKING PRINTER TO PRINTER MEASURE RESISTANCE OF EACH HEAD RESISTOR FROM HEAD CONNECTOR TO GROUN
70. nce Switch Assembly Replacment a Perform removal replacement procedures 1 3 5 6 and 7 With needle nose pliers firmly grasp the paper advance key pressing the tabs on the switch cover inwards Firmly pull out to remove Remove spring With needle nose pliers remove switch retaining nut Replace paper advance switch assembly Assembly Level Maintenance START PLUG AC ADAPTER RECHARGER INTO OUTLET OF PROPER VOLTAGE SEE TABLE 5 1 NOTE A PORTION OF THIS FLOWCHART APPEARS ON PAGE 3 17 MEASURE VOLTAGE BETWEEN BATTERY TERMINALS IF INDIVIDUAL FUNCTION FAILURE SUSPECTED VERIFY USING APPROPRIATE KEY SEQUENCE TEST PARA 3 7 Figure 3 1 HP 97 Assembly Level 3 16 Troubleshooting Flowchart MEASURE 1 VOLTAGE AT POWER OUTLET 2 Van AC ADAPTER RECHARGER OUTPUT NO KEY IN Li YES NOTE DISPLAY SHOULD READ 8 888898888 84 POSSIBLE PROBLEMS INCLUDE APPROX 115 CALCULATE View 10 55 Vuax 7 82 CALCULATE Vus Vin 21 1 Vuar Vin 15 65 CONNECT A 5 WATT 50 TO 100 OHM RESISTOR ACROSS BATTERY TERMINALS AND OBSERVE DRAIN PROPER YES DISPLAY NO DIGIT OVER BRIGHT ON DISPLAY DIGIT HAS TENDENCY TO TURN ON NEXT DIGIT CAUSING GHOST IMAGE TO APPEAR ONE DIGIT MISSING SEGMENTS ALL DIGITS MISSING SAME SEGMENTS SIMGLE DIGITS MISSING FROM DISPLAY SEGMENTS
71. nd press The display should show and the printer should not attempt to print If the out of paper switch passes this test proceed to step b otherwise continue troubleshooting the problem at step 2 2 If the out of paper switch does not inhibit printing as described above disconnect the two red leads from the printer PCA near the 0 see figure 4 11 and insert a continuity tester between them If the tester does not light with paper out of the printer clean or if necessary replace the out of paper switch after disassembling the printer using steps b and c and figure 6 2 3 If step 2 shows the out of paper switch to be functioning properly disconnect the red and black leads to the paper advance switch from the logic PCA see step 6 of the HP 97 assembly removal and replacement procedures paragraph 3 24 and insert a continuity tester between them If the tester does not light when the paper advance switch is not pressed replace the switch by following the procedures given in step 12 of the procedures referenced above paragraph 3 24 4 If steps 2 and 3 show the out of paper switch and the paper advance switch to be functioning properly replace ROM 0 on the logic PCA b Disconnect the dc motor leads one red and one black out of paper switch leads two red and reed switch leads two white from the printer PCA See figure 4 11 4 16 HP 97 CAUTION Do not put
72. nd run it again replacing additional ROM s as indicated until the num ber in the calculator s display agrees with that in the DISPLAY column c Compare the calculator printout to the PRINTOUT column of table 4 2 If they are not identical replace one ata time ROM 5 and the PIK chip until the proper printout is obtained when the entire initial test is run after each replacement 4 14 PROGRAM MEMORY TEST 4 15 To run the program memory test follow the procedures detailed in the flowchart of figure 4 2 97 9 Vx 8 e B 4 gt gt 8 Table 4 2 Initial Test 00 07 76 7 777777777 77 7 777777777 77 0 00 7 777777777 77 1 357478307 78 1 357478307 78 7 777777777 77 7 777777777 77 7 777777777 77 7 777777777 77 7 777777777 77 7 777777777 77 0 00 7 777777777 77 3 6 0 1 3 6 0 Component Level Maintenance 4 7 Component Level Maintenance HP 97 SET SWITCHES orc IT TRACE MANI READ SIDE 1 AND SIDE 2 OF PROGRAM MEMORY TEST CARD REPLACE CRC ROM 6 AND DISPLAY ROM 0 RETURNING TO START PRESS 0 00 AND CHECKING FOR PROPER DISPLAY AFTER EACH REPLACEMENT DISPLAY 222 00 SWITCH TO Run REPLACE ROM 2 DOES IS LEFT RIGHT SIDE OF SIDE OF DISPLAY DISPLAY SHOW GREATER THAN REPLACE ROM 5 16 26 46 112 PRESS Figure 4 2 Program Memory Test 4 16 FU
73. ode LED Digit and decimal point are contained within a single eight segment LED e 15 digit display including two sign digits e Minimum maximum display number 1 X 10 9 999999999 1099 Formats Fixed Point Scientific Engineering Special Special indications Overflow Underflow Low Battery General Information Numbers are shown with places to the right of the decimal point Numbers are shown in sci entific notation with n places to the right of the decimal point Numbers are shown with 1 n digits and an ex ponent of 10 that is the near est multiple of three Error written on display when improper operation is attempted see appendix A Crd written on display when card is expected X register overflow dis plays all nines 9 999999999 99 Zero in scientific notation If in fixed notation automati cally reverts to scientific notation for small numbers that would otherwise appear as zero LED at upper left of dis play lit for 30 seconds to 10 minutes before display blanks Environmental Specifications Operating 0 to 45 C 32 to 113 F with paper 5 to 95 relative humidity Charging 15 to 40 C 59 to 104 F Calculator Storage 40 to 55 C 40 to 131 F Paper Storage 40 to 30 C 40 to 86 F less than 60 relative humidity Note Avoid exposure to direct sunlight or artificial light sourc
74. orage registers Aso through Rss Table 1 2 HP 97 Programming Key Index Automatic RUN Mode PRGM RUN switch prom setto RUN Function keys may be executed as part of a recorded program or individually by pressing from the keyboard Input numbers and answers are displayed by the calculator except where indicated Data or instructions loaded from magnetic card into calculator when card is passed through card reader Pressed from keyboard 00806088000 User definable keys Cause calculator to search downward through program memory to first designated label and begin execution there Executed as a recorded program instruction D g G gp b e g e e 1 2 3 8 5 6 7 8 9 Label designators When pre ceded by EN define beginning of routine When preceded by or 22 cause calculator to stop execution search downward through program memory to first designated label and resume execution there 1 3 General Information Table 1 2 HP 97 Programming Key Index continued PROGRAM Mode Automatic RUN Mode Active keys Go to Followed by O O n n positions calculator to step nnn of program memory No instructions are executed PRINT Prem Print program Prints contents of program memory beginning with current step and continuing until two consecutive instruct ions are encountered or step 224 is printed Clear program Clears program memory to all instructions
75. peating the functional test replacing the indicated IC s until display is not generated Display format for value may vary Component Level Maintenance HP 97 SYNC Test points Anodes of CR5 and CR6 Test point Pin 20 of ACT 01 Oscilloscope time base 2 5 Time base 0 1 ms cm Vertical gain 5 V cm Vertical gain 2 V cm Figure 4 4 CR5 and CR6 Anode Waveforms Figure 4 6 SYNC Waveform Test point Pins 16 and 17 of ACT U1 Test points RCD Pin 21 of ACT U1 Oscilloscope time base 1 STR Pin 11 of ROM 0 U2 Vertical gain 5 V cm Time base 5 ms cm Vertical gain 2 V cm Figure 4 5 1 and 2 Waveforms Figure 4 7 STR and RCD Waveforms These waveforms are as seen with an HP 182C Oscilloscope HP 1804A Vertical amplifier Plug In Vertical bandwidth 50 MHz Calculator ON with 0 00 in display 4 12 97 Component Level Maintenance IF INDIVIDUAL FUNCTION FAILURE SUSPECTED VERIFY AMD REPAIR IF NECESSARY PERFORM LOGIC PCA USING APPROPRIATE KEY OPERATIONAL TEST SEE SEQUENCE TEST SEE FIGURE 4 10 4 1 AND TABLE 4 1 CHECK WAVEFORMS AT ANODES OF CAS AND CR6 WITH OSCILLOSCOPE SEE FIG 44 REPLACE ONE AT A TIME ROM 0 AND ROM 3 UNTIL PROPER DISPLAY AND PRINT ARE OB TAIMED RETURN TO START AFTER EACH REPLACEMENT REPLACE OME AT A TIME ROMO ROM 1 AND ROM 3 UNTIL PROPER DISPLAY IS O
76. power on preset circuit is included Figure 2 11 shows the equivalent circuit Figure 2 11 Power On Preset Circuit 2 45 Basically when power is applied Q1 is turned off Vss rises and the voltage across C1 also rises resetting the ACT When Vss rises to the correct level Q1 turns on discharging C1 now ready for the next power on sequence 2 5 2 6 SECTION III Assembly Level Maintenance 3 1 INTRODUCTION 3 2 This section includes procedures for a Isolating any calculator malfunction to a replaceable assembly b Disassembling the calculator to permit the faulty assembly to be replaced c Replacing either the faulty assembly or certain associ ated components that can be replaced without desoldering 3 3 The HP 97 Assembly Level Troubleshooting Flowchart figure 3 1 shows the step by step procedures for isolating a malfunction to a replaceable assembly Refer to the HP 97 Exploded View figure 6 1 and the 97 Assembly Removal and Replacement Procedures paragraph 3 24 for aid in replacing the faulty assembly CAUTION Be sure that the bench setup for trouble analysis has adequate electrostatic protection otherwise IC s may be damaged 3 4 If a calculator is received with a complaint regard ing only a particular inoperable function refer to the individual key sequence tests table 3 1 for verifying and correcting the malfunction 3 5 After known malfunctions have been corrected
77. procedure is given in figure 3 1 Figure 5 1 HP 82033A Battery Pack 5 5 ADAPTER RECHARGER 5 6 Table 5 1 lists the various ac adapter rechargers available for use with the HP 97 Figures 5 2 through 5 7 show the plug configuration and location of the part number A checkout procedure is given in figure 3 1 Table 5 1 AC Adapter Rechargers HP MODEL NUMBER 8203 1A 82032 A VOLTAGE IDENTIFICATION European UK desktop 82032A Opt 001 UK with RSA plug 82039A Australian 82040A US 82043A European Indicates nominal voltage acceptable ranges are 200 to 254 Vac and 90 to 127 Vac Figure 5 2 HP 82031A AC Adapter Recharger Figure 5 4 HP 82032A Opt 001 AC Adapter Recharger 5 1 Accessories Figure 5 7 HP 82043A Adapter Recharger 5 2 HP 97 5 7 HP 82044A Security Cable and Lock 5 8 Description 5 9 Located on the back of the HP 97 is a permanently mounted slide out hasp This hasp provides a convenient strong point of attachment to the calculator The use of the HP 82044A security cable and lock connected to the HP 97 hasp securely ties down the calculator to prevent theft See figure 5 8 Figure 5 8 HP 82044 Security Cable and Lock 5 10 Conditions of Replacement 5 11 Replace when cable lock or hasp broken 5 12 HP does not stock replacement keys For replace ment consult local locksmith 5 13 82037A RESERVE POWER PACK 5 14 Description 5 15 T
78. repairable assembly vacuum tube photocell etc voltage regulator jumper wire socket crystal tuned cavity network printed circuit assembly printed wiring board phillips head peak peak to peak point peak inverse voltage positive negative positive peak working voltage porcelain position s pozidrive radio frequency round head root mean square reverse working voltage rectifier revolutions per minute resistor transistor logic second slow blow selenium silicon silicon controlled rectifier stainless steel steel special single pole double throw single pole single throw tantalum time delay titanium toggle thread tolerance transistor transistor logic micro 1076 volt s variable violet direct current working volts watts wirewound white working inverse voltage yellow Service Cards C 1 INTRODUCTION 2 The HP 97 is a powerful and complex electronic device containing many components including nine IC s which are used by the calculator s internal programming in a sophisticated systematic manner Accordingly the HP 97 is liable to malfunction due to faults in one or more of a number of components primarily the IC s Identifying which of these IC s is responsible for a particular mal function can be costly in both parts and labor if the trial and error approach to troubleshooting is used on this comp
79. shooting Flowchart Continued 3 17 3 18 ne ia 97 4 1 4 2 This section includes procedures schematic assembly diagrams and material lists for use in trouble shooting and repairing assemblies of the HP 97 calculator After the procedures of section III have shown a particular assembly to be malfunctioning refer to the appropriate section below INTRODUCTION a Logic printed circuit assembly including the power supply circuitry paragraph 4 4 b Printer assembly paragraph 4 21 c Keyboard assembly paragraph 4 28 4 3 RECOMMENDED TOOLS AND FIXTURES 0960 0062 6040 0329 8690 0060 8690 0082 8690 0129 8690 0132 8700 0003 8700 0006 8710 0026 8710 0549 8730 0008 8730 0020 8500 0232 8500 0790 T 155321 T 155435 T 155429 00091 92137 97 ET 9613 91 M ET 9613 91 A ET 9610 HP 180C 1801A 1820C HP 6213C HP 3469B HP 10004 See appendix C See appendix C See appendix C See appendix C See appendix C d Display circuitry paragraph 4 30 e Card reader assembly paragraph 4 35 4 4 LOGIC PCA TROUBLESHOOTING 4 5 To troubleshoot and repair the logic PCA follow the step by step procedures given in figure 4 8 See also the logic PCA component location diagram figure 4 9 and schematic diagram figure 4 10 4 6 POWER SUPPLY TROUBLESHOOTING 47 Troubleshooting of the power supply circuitry wh
80. side 2 of data card 2 Switch to RUN mode Press 3 7 Assembly Level Maintenance 3 18 KEYBOARD TEST 3 19 This test is used to check the operation of each key on the keyboard after the calculator is assembled 3 20 To run this test a Set switches as follows OFF man NORM PRGM TTE RUN Enter the key sequence of table 3 5 Switch operating mode to PRGM BIT run Press PRINT Compare resulting printout with that shown in table 3 5 gt If printout is correct proceed with the diagnostic test paragraph 3 21 if not inspect keyboard and replace if necessary then proceed with the diagnostic test Table 3 5 Keyboard Test PRINTOUT KEYSTROKES CHS g a 5 fal fo HONOR CD CD C hi fo Pa Po tM 3 8 HP 97 Table 3 5 Keyboard Test Continued KEYSTROKES PRINTOUT gos L 2 I xL gt m tal Gy lag Pa fo J C Fa NO UD TON Cn CD oca CO UD w EN cos m G e 2 2 gsscasaasgpggi Bg 2 92 7 3 21 DIAGNOSTIC TEST 3 22 This test ensures that the calculator will not fail when the user runs the diagnostic program supplied with the HP 97 Standard Pac and i
81. sistor is switched on As an example if all cathode driver transistors were switched on along with the a segment anode driver the a segment of all digits across the display would light TO ANODE lt ORIVERS Bone CATHODE LINES KEY 14 TOTAL LINES Figure 2 3 LED Display Format 2 2 HP 97 2 7 By sequentially switching on each cathode driver only one digit at a time is actually lit This happens too fast though for the eye to detect Each cathode driver transistor is sequentially switched on by the strobe STR signal provided by the display ROM and reset by reset cathode driver RCD which is provided by the ACT See figure 2 4 Figure 2 4 SYNC and Display Timing 2 8 The display of the HP 97 requires a large amount of current Though the display ROM decodes the display information given on the 15 bus by the ACT to switch on the correct anodes it alone is not capable of handling the large amount of current Anode buffers U3 and U4 are used for this purpose 2 9 Every cathode driver in the display that is switched on returns to ground that corresponding cathode line in the keyboard buffer U4 PIK which will decode and stere up to seven key codes This allows the operator to press keys very quickly without waiting for the calculator or printer to catch up The PIK will also hold each key code for approximately 4 5 milliseconds to negate the effects of key bounce 2 10 PE
82. the user runs the diagnostic program supplied with the HP 97 Standard Pac of which this program is a modification A listing of the diagnostic test program for assembly level main tenance is given in table C 3 C 20 The diagnostic test program card can be generated from the diagnostic program card SD 15A supplied with the Standard Pac as follows a Switch a working calculator ON Switch to RUN mode Insert side 1 of the Standard Pac card SD 15A Insert side 2 of the Standard Pac card SD 15A Switch to PRGM mode Press 0000 Press 9 8 Press i Feed side 1 of a blank card Feed side 2 of the card k Clip both notched corners of the card and label it appropriately monoc t C 3 vO na an ten fart Sa te 3524 nsouZeiq 6 2 SpJe2 46 00097 90130 newer PACKARD a u ad E Printed in U S A
83. urned on it shorts the windings and Q10 provides a signal ground for the base current from Q8 2 28 The printed line width and character to character spacing is determined by the speed of the dc motor To control the speed of the motor U4 samples the output voltage generated by the motor when the driver transistors are turned off and the motor is coasting Contained within U4 is a set of comparators Al through A4 Al compares the motor output 2 3 Theory of Operation voltage with a reference voltage derived within US If the motor is going too slow its output voltage will be less than the reference voltage The A1 comparator instructs the PIK to speed up the motor The PIK then changes the FWD signal pulse width to accomplish this This operaton occurs only during forward head movement If the head is moving too fast again the comparator output will change and the FWD signal pulse width will change to compensate 2 29 Print Intensity Control 2 30 To maintain uniform print contrast each head resistor must be energized to the same temperature inde pendent of battery voltage changes 2 31 The remaining comparators in U4 alongwith the resistor network in US produce the variable duty cycle signal STB which is nominally 10 kHz The STD signal will change its duty cycle to keep its rms value constant and thus print intensity constant By changing the value of R8 the nominal duty cycle of STD can be changed to adjust print int

HP-97 Service Manual

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