Tandy PC-6, Service Manual

Page 1: ...Page 1 of 27 Toshiba America Information Systems Inc and Apple Inc Exhibit 1012...

Page 2: ...gram 4 Interrupt Circuit Keyboard 6 Power Supply 7 LSI Pin Functions 8 DISPLAY 9 TROUBLESHOOTING GUIDE 10 Test Programs 11 Operation Check 14 PCB ASSEMBLY VIEWS 19 PARTS LIST 20 Electrical Parts 20 Me...

Page 3: ...10 P0 through P9 8 levels 4 levels 12 levels 2 lithium batteries CR 2032 for main frame 1 lithium battery CR 1220 for memory backup Maximum 0 07W 1 Continuous program execution approximately 85 hours...

Page 4: ...7 dots 24 digits a7 za12 d7 zd12 a1r a5 d1r d5 b7 zb12 e7 ze12 b1r b6 314 55 c7 c12 RONR14 c1 zc6 R0 zR14 RAM IC3 Ks2 uKs10 mW m12 KEYBOARD KEYBOARD HM6264ALFP ADO AD12 CS3 CS6 I00 I07 26 3671 26 3651...

Page 5: ...th digits display control Gate Array MB64H193 Interface between CPU and RAM buzzer control RAM HM6264ALFP 50 Stores data and program RAM has 8K bytes 64K bits capacity and contains a self control circ...

Page 6: ...2 3 When VDD2 drops the output of the IC becomes GND level and the CPU does not receive PG2 PG1 HD61747B25 0 Interrupt circuit for the voltage of the Gate Array and options when VDD2 and SW drop 1 Whe...

Page 7: ...BF VRAM Memory used to keep the voltage for the RAM V1 V5 LCD drive voltages Voltage is generated by connecting the external resistor to VDD2 VDD1 Power supply for the CPU RAM and options VDD2 Stays V...

Page 8: ...at switch OFF and VDD1 at switch MON Display voltage Divided vol tage from VDD1 CPU internal clock Display signal GND Chip designating signal Select RAM or other devices Select RAM or other devices P...

Page 9: ...00 1 0tone Upper electrode 5 Upper electrode 13 1 1131113glslUCIUUDDDCIDUDUUDDCICIDUDU DUCIUCIDCIDDCICIDUUDDDEICIUUDDDDDUDU UCl0ClClDDUDUUCIDCI CIDUCIDUUCIUDUDUUDDCIDDUUCIDUUUDD CIUDCJCIUDDDDDCIDCIUDU...

Page 10: ...Replace the LCD LSI HD61747B Replace the LSI A certain segment s Peeled heat seal Replace the heat seal cannot be displayed Broken heat seal Replace the heat seal LCD CA51 TS Replace the LCD LSI HD617...

Page 11: ...QRSTUVWXYZ BEEP 1 BEEP 1 PRINT INPUT OK GOTO 1 Ready Pl LIST 5 7 1 2 3 4 5 6 1 1 1 11 111 A A A 1 FOR B 1 TO C IF D B B THEN l NEXT B IF ABCDEFGHI JKLMNOPQRSTUVWX YZ THEN 1 IF A 5 THEN 11 PRINT A GOTO...

Page 12: ...ake out the 26 3651 CMT 5 PW SW ON BUZZER RUN DEG Ready P0 6 BUZZER RUN DEG DEFM INPUT OK Buzzer sound BUZZER RUN DEG DEFM INPUT OK 1 BUZZER RUN DEG DEFM INPUT OK 1 2 BUZZER RUN DEG DEFM INPUT OK 1 2...

Page 13: ...63651 or PC 5 26 3652 cable PC 4 Printer 26 3671 1 PC 6 PW SW ON 2 s 2 READY P0 Print sample PC 6 CHECK ABCDEFGHIJKLMNOPORST UVWXYzabcdefghijklmn opqrstuvwxyzib 123456 789 Jr 0DAX 6I 0052 Z 2uy6 5eT 7...

Page 14: ...the printer and cassette interface be sure to turn off the power switch Operation BUZZER WRT DEG 7520 P Q 123456789 OWERTYUIOP BUZZER RUN DEG OWERTYUIOP 7 BRK ASDFGHJKL Em BUZZER EXT RUN DEG ASDFGHJKL...

Page 15: ...0 123 456 789 9 3 BUZZER EXTRUN DEG EXE 1910 877 BUZZER EXTRUN DEG Check that the cursor moves E T K II E BUZZER EXTRUN DEG UR DEG 191 D 877 t 2 T 310 loeetl BUZZER EXTRUN DEG STAT 1 2 0 BUZZER EXTRUN...

Page 16: ...Page 16 of 27 BUZZER HALE B BUZZER 123EXE C BUZZER A 56088 BUZZER A B C BUZZER Ready P0 3 l BUZZER TRACEON Ready P0 BUZZER Ready P0 itI OU rn BUZZER Ready P0...

Page 17: ...Page 17 of 27 RUN GRA PRT ON BUZZER 1 BUZZER I 0 W x I E3 BUZZER RA MEM e L31 1 Q _v_IW BUZZER BUZZER ASMBL Asmbl Source ca1 BUZZER RUN GRA Ready P...

Page 18: ...SW OFF ON Turn the contrast volume Repeat 3 times Read Out BUZZER RUN GRA Ready P0 BUZZER 10 BEEP 1 WRT GRA BUZZER 20 GOTO10 WRT GRA BUZZER RUN GRA buzzer sound BUZZER Display must disappear Display s...

Page 19: ...Page 19 of 27 PCB ASSEMBLY VIEW TOP VIEW as _ _ _l V V E V Q W...

Page 20: ...B G7 07 2 82636702 RESISTORS R1 zR9 Chip Ruthenium 3 3 Kohm 1 8W l 5 CR32 108 332J T TP ND 0230EBN 27930620 R10 Chip Ruthenium 12 Kohm 1 8W i5 CR32 108 123J T TP ND 0288EBN 27930638 R11 Chip Ruthenium...

Page 21: ...1 to PCB G707 2 CAX 12 3 _AHC 0348 56006320 Seal Insulation for heat seal of PCB AHC 0349 63471010 Seal Insulation for upper keyboard film AHC 0350 63470990 Seal Insulation for lower keyboard film AH...

Page 22: ...yboard case A47157 7 Spring Ground for keyboard film C4988 1 Spring Ground for PCB holder C4737 1 Screw Tapping flat head 2 mm x 3 5 mm A45491 13 for PCB holder Screw Tapping flat head 2 mm x 3 mm A45...

Page 23: ...M E S S A R w W F V D E D 0 L P X E INSTRUCTIONS 1 RemoveV3 screws mfrom the lower case 3 Remove 9 screws 1 screw and 1 screw 2 Lift up the lower case and from the PCB holder and Remove the PCB holde...

Page 24: ...3 5 8 U 51 51 3 2 3 3 m 25 I E lC2 IC1 Ks C517 3 2 R2202 X4 cg fa HD61747B25 HD61747B20 g 22m 181588 68 Km10 c8 xmu Km F 2 3 I 2 33 7 3 b7 I7 54 EEEEEEEE 2 cn R12 22 uF10V 2209 D jjjwu Sam 5 85 vDD4 C...

Page 25: ...o W1 4 IV zmA4 Jugmz_ pmmmm H30 3 o 0 6 0 o 0 o o o 0 o o4 m m zmzp Q Emopmmm o E V o mm oumzL H H Q Oxop gm 0 o 0 0 0 O o o 0 0 3 72 0 CD ZZZ UYIIIWIIIIIIIIIIIIII6 25 E QL mLI J IO 00 CO 5 xmm _mE O...

Page 26: ...Page 26 of 27 ZZ OO 8 gt _D D LU MEIE EWRTDEGRAD TFBLl sounce BUZZEREXT GRA DEFM II DEGRADGRAMEMOTRACEONlI i DEFMASMBLSOURCEEDITPETON _L_j_ B RUN i WRT I I I I I I I...

Page 27: ...102 CANADA BARRIE ONTARIO L4M 4W5 TANDY CORPORATION AUSTRALIA DELSIUIA FRANCE UK 51 KURRAIDIIE AVENUE RUE DES PIEDS D ALDUEITE 39 DP II l 55DZ2 BILSIUN RUAD WEDIIESBURY IADUIII DRUITI II S V 2 IID SII...