Sharp PC-1250, Service Manual

Page 1: ...device and 24 digit thermal dot printer is incorporated as the output device 1 PRODUCTS OUTLINE 2 SPECIFICATION 3 BLOCK DIAGRAM 3 4 CPU INTERNAL BLOCK DIAGRAM AND PIN SIGNAL DESCRIPTION 4 5 LCD DRIVE CIRCUIT AND TIMINGS 7 6 SER VICE PRECAUTIONS 9 7 SCHEMATICS 10 8 PARTS SIGNAL LAYOUT CHART 11 9 PARTS GUIDE AND PARTS LIST 12 PC 1251 PC 1250 MODEL CODE OOZPC1251 E SERVICE MANUAL SHARP PC 1251 ...

Page 2: ...ogical operators 10 digits mantissa 2 digits exponent Cursor left and right line up and down character insert character delete CMOS Battery backup 24 character liquid crystal display with 5 x 7 dot characters 52 keys Alphabetic numeric special symbols and functions Numeric pad User defined keys 6 0 V DC Lithium cells Type CR 2032 6 0 V DC 0 03 W Stack Sub routine 10 stacks FOR NEXT 5 stacks Functi...

Page 3: ...16K Byte 2 4 K Byte _ Lithium cells RAM SystemROM CPU X2 24 DiG LCD 11Pin PRINTER OFF llilI J ON 0 24 Dig it THERMAL PRiNTER STANDARD CASSETTE RECORDER SP UM 3 Type NicdX4 MiCRO CASSETTE REC cAssETT E ci i1 1 Controller 1 REMOTE DIDO OFF ON I ROLL PAPER I OPTiON CE 125 AC Adaptor SYSTEM LAYOUT Reserve Conditioning key Key board Power Mode slide switch Display section KEY LAYOUT ...

Page 4: ...L R W 01 s or SC43536LD 4 VA Vs Vrns SC43536 Se 11 V cK BUSY SeiZ Din Dout C P U SC61860A02 or SC61860A02LD R W _ _ 1 1 AL _ l t 01 0s DATA BUS l AO 1 3 l t n fj ADDRESS BUS B01 1 l il t n fl fj I B03 F01 3 L l l li J r t fAF CHiP ENABLE IBs IB1 FOu F05 F03I IB5 IB3 BUZZER c i KEY MATRiX 51 KEY ON KEY Slide Switch 1A1 I r IAs IB1 IB4 XoXi VGG TEST dT RESET KON G N_D __ vcc voc Vots Vs VM VA L r z ...

Page 5: ...MT in of microcassettesignalfrom the CE 125 option 9 ON IN ON BREAK key input normally pulled down to low level 10 Xout OUT Output MT out 1 of microcassette signalto the CE 125 option and the buzzer 11 Dis OUT LCD driver control signal 12 HA OUT LCD driver clock low during standby and in 2 kHz oscillation during display CPU pin No and signal description 110 PORT 1 4 KEY OUT 5 8 for TERMINAL INTER ...

Page 6: ...D backplate signal high impedance during standby and 4 level pulse during display 33 H2 OUT LCD backplate signal high impedance during standby and 4 level pulse during display 34 H3 OUT LCD backplate signal high impedance during standby and 4 level pulse during display 35 H4 OUT LCD backplate signal high impedance during standby and 4 level pulse during display 36 H5 OUT LCD backplate signal high ...

Page 7: ...enable CE2 63 Fo3 OUT BasicRAM PC 1250 PC 1251 chip enable CE3 64 Fo2 OUT Data out Dout data output port to peripheral 65 Fo1 OUT BUSH l F output port output 66 Bo8 OUT LCD driver LSI chip enable CE4 67 Bo7 OUT A 14 Addressbus high during standby 68 Bo6 OUT A13 Address bus high during standby 69 Bo5 OUT A 12 Addressbus high during standby 70 Bo4 OUT A 11 Addressbus high during standby 71 Bo3 OUT A...

Page 8: ...a rt Read Write RAM FOR DISPLAY 64 byte 64 byte 40 7F 00 3F LCD display screen of 24 digits is divided into two sections H 1 H 7 are used for the backplate signal from the first to twelveth digits H8 H 14 are used for the backplate signal from the thir teenth digit to the twenty fourth digit Thus the LCD is operated in 1 14 duty Vtns VA M M AL Qj 0 c l E Ol l l S6 2 i S6 1_____ S63 S63 GND VGG DIS...

Page 9: ...ON ON ON ON ON ON ON ON OFF all OFF vrns vsr _ Back plate H1 wavefor V MH Segment Terminal waveform GND VAH h 3 TR3 h 4 TR4 h 5 TR5 h 1CTR1 h 2CTR2 RES DiS HA COUNTER SECTiSN Segment terminal waveform LCD POWER SUPPLY r Vee VGG About 6V l Voe L CD CONTRAST CONTOL VDiS S1 l Vs CPU LCD VM DRiVER I 1VA s 62 l LJ ...

Page 10: ...ng display or damage to other parts could result Be sure the battery is properly installed 2 When the memory module PWB is replaced it could be installed slightly out of alignment due to the play in the screw holes Since this could lead to improper operation replace the PWB again and press the ALL RESET switch befor resuming operation 1 Since it is difficult to troubleshoot the main PWB because of...

Page 11: ...I I 101 1 1 6 I J I I C_ _2 1_9 _Y j ss 20 2_ 15 16K Byte ROM 25 11 F F _ _ c 1 0 F l IGND tt it 4 t it 4t VGG Address Bus l ti 1 _ Data Bus t Segment s s1s1s s l s l s sis slslsislslslsls sis sl s l s l s s sls s s s sl sls l s l sl s s l s js l s sJslsls s l s ls l s s s sis sis s sis sis 3 4 5 u 12113114 15 21 2123124125131 13313435141 2j43 f45146 7 4814915051 52l53154J 56l57ffi 1142141 35j34J3...

Page 12: ...SELi IB6 SEL2 IBB Dout Xin MToutl Xout MT in t l F02 1 FO I VGG GND GND LSi signal name Terminal Option Side MTout2 Reset SW IOOPF 12 IB7 ACK jJL x3 _H532916 116K Byte ROM CPU SC61860A02 SC6 I 860A02LD VA VB 3 3JJF VDC Lithium cell r CR2032x2 VGG GND VGG LI 220 ...

Page 13: ...11 8 PARTS SiGNAL POSiTiON ...

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Page 18: ...2CCNl AC B TRANSiSTOR CHiP 2SC281 2 L5 L6 RR KZ1050CCN1 AA c RESiSTOR 20KD 5 VCKYPU1HB101K AA c CAPACiTOR lOOPF 50V VCTYPU1EX333M AB c CAPACiTOR 0 033µF 25V VHDDS1588L2 1 AD B DiODE 1 S1 588L2 VHERD 6 2E8 1 AC B ZENER DiODE RD6 2E8 VHiSC43536 1 AX N B LSi SC43536 VH i SC6 l 860A02 BE N B LSi OR VHiSC61860A01 VRS TP2BD104J AA c RESiSTOR CHiP 1 OOKD VRS TP2BD105J AA c RESiSTOR CHiP 1 MD VRS TP2BD220...

Page 19: ...16 PARTS GUDE ...

Page 20: ...SHARP CORPORATION Industrial Instruments Group Reliability Quality Control Department Yamatokoriyama Nara 639 11 Japan December 1982 Printed in Japan Y ...