SERVICE MANUAL - Sharp Pocket Computers
Contents
1. 1280 PWB unit 1 gt F PARTS CODE QCNCW1306CC1B RC CZD105ECZZ 21047 22 RC EZ335BECO0J RC KZ21054CCZZ RC 221006CCZZ RCRSZ1063CCZZ RH DZ1001ECNI RVR 22400Q0C22Z2 5 LON Connector 11pin u 73 Capacitor 1uF dy xu Capacitor 0 J z Capacitor 6 3WV 3 3uF Capacitor 50 ZT gt Capacitor 0 1 Crystal 768KHz Z Z 2 JL Diode 1SR148 AE Variable resistor _ RIYA Capacitor 50WV 100PF 7 gt gt gt gt _ Olo o o 1 T VCCCTP1HH151J N C Capacitor 50WV 150PF 1047 Capacitor 25WV 0 10 VCKYTPIHB821K N Capacitor 50WV 820PF JJ xu VHDDAN202K 1 B Diode DAN202K FARE VHDDA204K 1 Diode DA204K 744 VHDDSS133 1 VHiD4364G15LN Diode D55133 IC D4364G15LN IC _ on 9 gt un B DC i 19 VHiLZ92K38 1 IC 1292 38 IC 20 12800 1 AE DH IC MN1280Q ker LATE AX SC43536 IC 22 15 61860 382. BUSY ACK 907 566 567 SEWRBAREREBUEUE 2s were to short pee ttt 295 571 P dE 574 575 ELTETT 7 Ao 818 EAREN 878 ooo 79 SENS PC 1280 11 Circuit Diagram 1 The resistor with no comment is J 5 2 The capacitor with no comment is 25WV F H 7 14 73 LCD 5 rm PEEEEEEEEEEEEEEEEEEEEEEE EE EES sia VRI tum me SC43536 5343536 i DISP1 DISP2 Sea H7 C8 o o3s 8 vip 820P NI el UU ERE AM E d BIEN L 792 38 i fies VGG 2 MESS ae LU lias G R SHHZZZZSS i n e Size c imi Milli SEI A SEA MEC UNES A EE ES A AoA 5 yu SE 21222 I Rees 1 pe puer Te na NN SR risa o ll i eee 2 ree rH p e sme 7 8 SLE 42 8 3L Internal Protect SW NC EL NS A SHORT OPEN 8 D E 2 E HEE pea Hea Heres AL a est HEHA R Tet He Dum Is ceu lama em
3. 8000 Low battery D1 Do latch CE Q 3200 Caution PON AR16 latch write CE F15 8400 ROM bank CE 3600 RAM bank address Port write 2 00 selection F16 880 3A00 Port write 3E00 Key strobe write CE 4000 gt D3 D2 D1 DO ha eS 1 HP WED AKSE Internal ROM 1 1 1 1 KSi KS8 PISP 8 port 0 1 T System ROM i 16KBX8BANK BANK RO r 8000 A000 External slot Internal RAM 8KB T T SLT2 SLT1 Memory mapping according to RAM card combination D800 FF SO0 PERE 2 DOOUCEFER COUS FFEF 1280 6 Low Battery Detect Circuit Discussed next is about the low battery detect circuit which is incorporated in the PC 1280 As shown in the figure BELOW when the input voltage VIN goes above the detect voltage level VD its output turns to high level On the contrary when VIN goes below VD the output turns to low level Two levels of caution and stop are detected by a single LB iC MN1280 The input voltage added to the input pin No 2 is divided by R1 and R2 and R2 is turned on off by the CAU signal of G A As shown in Fig 3 when the supply voltage drops below the caution level the BATT symbol comes to activate When it further drops down below the stop level the symbol goes out
4. Rubber connector for RAM card RAM4 kK a9 24A34 725 AREE 29 1 5940 022 30 51608 22 0 C DC DB 31 PZETL1564CCZZ AB C_ Insulator sheet gt F AB Battery terminal A 297 277 7 33 Contact for slide switch RIA KAA v FAN yT PS switch knob PS24 v4 Key cabinet unit Bottom Aay Battery terminal B stopper AFA PAFF 194 IRN 77 C PLI GCABA1030ECZZ D 0 21504 22 37 1 1190 5 C TLABH1127ECZZ DA N 1143 22 N C AE Du D C LX BZ1018ECZZ mun Battery caution label except Japan 77 274 2 5 Lid for card Battery terminal HO 77 Screw 21147 22 gt gt c 43 LX BZ1116CCN1 1 AA DA Vey 9 ITLABHI160ECZ2Z N Caution label Battery replacement Japan FY 2727 294 2 0 C Caution label Battery replacement except Japan 7 3927 F274 24 6 PZETL1029ECZZ AB N C_ Insulator sheet Yvx42 v k 101 TLABSI078ECZZ 03 TLABH1956CC2Z AB ae dh ex BETES S RA 2726
5. mate 4 in CAB D keyboard side top cabinet CAB C Fig 1 Z Hole in CAB C keyboard side bottom cabinet The pin must be properly and firmly engaged into the hole 8 3 Installation of the contact to the switch Latch B knob Two contacts may be attached to the knob but it has to be installed on the location shown in the figure After installing the contact it has to be caulked to fix it secure Latch C Latch C Fig 2 Contact 1 Engage the latch A shown in Fig 2 in a manner as shown with in Fig 1 2 Engage the latch B shown in Fig 2 3 Engage the latch C shown in Fig 2 in a manner as shown with in Fig 1 Procedure to remove CAB A 1 shown in the figure insert your nail in between and and push it in the arrow direction to disengage the latch C Fig 2 at two locations CAB C must be disengaged first to achieve easier removal 8 4 Installation of PWB keysheet etc Assemble the blind sheet and the main PWB unit onto CAB B Insert rubber keys in CAB D then insert upper half of the key sheet Match the guide pins and key sheet holding pins in their positions Match the key spacer with the guide pin and insert Fold back the lower half of the key sheet and insert only the terminal onto the guide pin NOTE Leave the lower side key sheet uninserted onto CA
6. 8 6 Ground continuity check Make sure that the resistance between the display side cosmetic panel and the RAM card lid is not more than 50 8 7 Internal RAM capacity and auto power off functional checks The contents of the memory will be erased after the following is conducted Depress the ALL RESET switch The following will be displayed MEM 2 MEMORY ALL CLEAR OK 2 Push key 3 Type M and ENTER 6558 will come displayed 4 Leave itin the above state for more than 14 minutes then make sure that power has been turned off Push the ON key to bring the display message in above 1280 8 8 Precautions e All components must be closely attached to the PWB and soldered e When the LSI is replaced use KR19RAM to solder with see Service Information PS 009 e The 0 1 ceramic capacitor RC KZ1054CCZZ inserted across the KON pin of GA 26 and the side of the 0 033 uF must be handled in the following manner Tube 13 14 The capacitor must be inserted to the 11 pin connector in the following manner The resistor 100 must be inserted in the following manner CAN The diode must be inserted in the following manner The capacitor RC K1E104HCZZ x 2 pieces must be inserted in the following manner 20 8 9 Display side cabinet and keyboard side cabinet The above two cabinets are mated together with the spring pin in u
7. AX FU IC SC61860A38 IC VRS TP2BD100J Resistor 1 8W 100 506 7137 24 VRS TP2BD103J Resistor 1 8W 10KQ 5 _ 7137 25 VRS TP28D104J Resistor 1 8W 100KQ 59 74 29 e Resistor 1 8W 10 0 5 Resistor 1 8W 20 0 596 7437 Resistor 1 8W 9 296 7137 Resistor 1 8W_4 7KQ 5 7137 Resistor 1 8W 5 6KQ 29 74 2 7 Resistor 1 8W 56KQ 5 Transistor 144 Transistor 144 Transistor 5 2412 Capacitor 25WV 0 Resistor 1 4W 100K0 5 o 2 104 J ilh Unit AAYVERY 22 F DESCRIPTION Template Instruction book Japan F 7 Z22 4 22 4213 Instruction book except F9 7 22 4 eV 2 4 3 Instruction book Germany FUT VALE 24713 Packing case Japan 77 Packing case except Japan X 77 Service list Japan E AVAL Packing cushion for set P H AVAL IT vy Var a i ee 5 1122 722 Ti NSG1123ECZZ SPAKC0276ECZZ 1280 SHARP COPYRIGHT 1987 BY SHARP CORPORATION All rights reserved Printed in Japan No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or
8. an displayed Press the ALL RESET button 1 OFF the power remove slot cover and slide the Memory Protect Switch to position A Replace the RAM card if used Replace the slot cover and slide the switch back to the LOCK position Replacing memory backup cell The memory backup cell in your PC 1280 has an effective life of about five years under normal operating conditions Note that temperature extremes can shorten cell life and cause memory losses When the memory backup cell was installed at the factory a label was attached above the memory protect switch showing the date of installation and a control code 11 12 13 Replacing Memory Backup Cell DO NOT REPLACE THE MEMORY BACKUP CELL WHEN OPERATING CELLS ARE REMOVED OR WEAK DISPLAYED WITH POWER ON MEMORY CONTENTS WILL BE LOST 1 Turn OFF the power close the computer and turn it over 2 Remove the slot cover and RAM card if present 3 Slide the Memory Protect Switch to position B 4 Release the screw 1 retaining the cover of the Backup Cell compartment and remove the cover 2 Replace the cell 3 making sure that the new cell is inserted with the correct polarity positive pole down Slide the Memory Protect Switch back to position A 7 Replace the slot cover w v 5 2800 DISP 1 2A00 DISP 2 D0 gt 0 14700 75 Ji
9. ba THE ay Ed rc ed 0 033 B E EL E ES E das aat 8 7 09 DAN202 1 2 Pena S PHN 1A7 eV mum T LOCK OPEN ON ell RI2RIS 15148 B 39K G 624 7 R7 EX SHORT T Oma i 5 SC61860 sa 3 Zl 7 s A38 2 C8 100 H a 0 1 X 58768 Lar IM ES SEX 1 eet ot EHE _____ 1 2 dept 070144 6 I 1 Cos DAN202 i GND 0 1 wa PYP ava uem H cp EE DETIT Tae 777 NER lt 1 SPS NR FL CHIESE T pd D8 DAN202 oe a IL SUBI ET DUM ae a 12 Parts amp Signal Description Main PWB bottom side Memory PWB bottom side ES x e 1280 Main PWB upper side Jn weri ES Nici Except JAPAN CLOSE 1 2mm heigt MAX Memory PWB upper side No foil pattern 1280 13 PARTS LIST amp GUIDE Exteriors 3 RI PARTS CODE Tis s Edi DESCRIPTION DUNTGI226ECZ22 D Japan E372X Bayt jDUNTG1229ECZZ2 except Japan 7 2 Xx E v E PFiLWIO09ECZZ AD DF N C RY 3974 NI 5 21019 22 AB DC
10. by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher SHARP CORPORATION Information Systems Group Quality amp Reliability Control Center Yamatokoriyama Nara 639 11 Japan 1987 March Printed in Japan
11. the power OFF 2 Close the computer and turn it over Follow the diagrams on the slot cover to remove the cover 3 Remove the RAM card if present 4 Slide the Memory Protect Switch to position B THIS IS IMPORTANT and must be done before removing the operating cells or data and programs in memory will be lost Replacing Operating Cells 5 Press the tab 1 and slide open the cell compartment cover 2 Remove the two lithium cells 3 6 Replace the two cells taking care that they are inserted with the correct polarity as shown in the diagram 7 Replace the cell compartment cover 4 8 Press the ALL RESET button THIS IS IMPORTANT AND MUST BE DONE TO PRESERVE PROGRAMS AND DATA 9 Replace the slot cover and slide the switch to the Lock position CE 140F Dimensions 135 W x 70 5 D x 19 2 H mm closed 5 31 W x2 76 D x0 76 H inches 135 W x 141 D x9 6 H mm open 5 31 W x5 55 D x0 38 H inches Weight Approximately 180g 0 4 Ibs with cells Accessories Lithium cells built in and operation manual Options Plug in RAM cards 2KB CE 210M 4KB CE 211M 8KB CE 212M 16KB CE 2H16M 32KB CE 2H32M Cassette Tape Recorder CE 152 Printer Cassette Interface CE 126P Pocket Disk Drive CE 140F seeessesemO000 CE 210M 2KB CE 211M 4KB CE 212M 8 CE 2H16M 16KB CE 2H32M 32kB 10 Open the computer switch on the power and look at the display If it looks like the following with
12. 2K 55 B 0 mse lt RAM2 gt xW AIT lt RAM2 gt ERROR OCCURED AT H lt RAM2 gt 2222 H IS CHECKED Menu NOTE 3 The RAM corresponds to the slot in the following way PC1280 PC1475 SLOT SLOT1 8KB internal RAM SLOT2 NOTE 4 The contents of the RAM are destroyed during the test To preserve the RAM contents type the P key to pass the test 2 11 pin test Set the 11 pin connector of the test tool with the 11 pin connector of the unit with the parts side facing up Menu lt 11PIN gt AIT lt 11PIN gt CHECKED ENTER Menu NOTE 1 See the following for the sequence of the test vs the test pin D XOUT XIN 49H 082 Vcc Q 101 102 40H 032 GND 102 101 DOUT DIN DIN DOUT BUSY ACK QCNCM1307CCIB Special test tool 11 pin connector Side circuit diagram Voc NOTE 2 Error will not be caused if signal lines were to short within the unit 1280 10 LCD Matrix Circuit 11 pin connector __ 3 penna am IU Ba SC 511 512 513 514 515 521 522 523 524 525 H2 53 soe A H 533 535 nE EDE EN E E H3 FT T TT LLELLLLI 7 S41 Z f the test vs the H8 H9 XOUT XIN HIO 101 561 01 102 Suh 102 101 563 HH rp S65 DIN DOUT
13. B D guide pin and holding pin and the folded area loose Fig 1 Main PWB unit CAB B display side top cabinet Blind sheet FPC guide pin Key sheet terminal guide pins Key sheet memory PWB p guide pins Lower half key sheet CAB D keyboard side top cabinet Fig 1 Memory PWB unit Fig 2 Mount the memory PWB unit in Fig 2 and insert only the FPC terminal onto the CAB B guide pin NOTE Donotinsert the memory PWB onto the CAB D guide pin yet Insert the mask sheet and fixing rubber Fig 3 and fold back a part of the FPC and insert it onto the CAB B guide pin Match the angle to the CAB B guide pin and fasten it with four screws NOTE Tighten two screws in the center first then two more adjacent to it Fold back h Guide pin PC 1280 Buzzer leads Fig 4 Bring the display side bottom cabinet CAB A Solder the buzzer leads first Fig 4 and fasten the terminal lug of the static tape using two tapping screw 9 Mate CAB A with Close the unit halfway and mount the lower half of the key sheet and the memory PWB on CAB D 4 Mate CAB C Static tape terminal lug CAB A Fig 5 Fig 6 8 5 Replacement of the static tape The static tape must be replaced with a new one once after it has been removed from the aluminum panel Wipe away residual glue after bonding Check ground continuity after the installation in reference to 8 6
14. N Mask sheet LL PPTL N B LCD unit LCD2 7 7 PGUMS1017ECZZ N C Rubber connector 142377 E Main PWB unit Include 9 717477 Z C Connector 12pin 2 77 7 RALMB1030CCZZ AD DF aus BER 3 PTPEHI026ECZZ LA wT So PGUMM1015ECZZ DC CPWBF1052EC01 5 pud LX BZ1155CCZZ _ m wo DB 7774 AFAF T 5 LANGTIOI1ECZZ AC DE g 7 LX BZ1200CCZZ C Screw DUNTG1268ECZZ APTEM Dj 2 2 gt D Connector cover BAIT 7 0 20 E D Key cabinet unit Top EF az F D Key cabinet unit Top except Japan X X 2 F 21 LPiNS1002ECZZ AA N C Spring pin XU E y 2 B rubber PGUMM1013ECSA AL LN C 23 2 11024 227 N C et spacer IHE BIET FU E Memory PWB unit Z 22 25 MSPRC1011ECZZ DA Earth spring TS x 26 5 1001 227 PS spring for RAM card RAM4 F39 7 7 22 QCNTM1042CC22 AA DA Slide switch terminal RPA tT ELA Slide switch knob RIA KALA v v Reset spring rubber Ney F 7 gt
15. PC 1280 SHARP SERVICE MANUAL CODE 00ZPC1280SM E POCKET COMPUTER MODEL PC 1280 poz POCKET COMPUTER SIZE Pc 24 2 LINE 128 LCD Screen 11 Pin Connector LCD Contrast Dial Jj RAM Slot 62 m cy ESO Cell co D Memory t 4 Keyboard Backup ABB MM eni EJ PJ c vl 8 NJ f J 0 Memory Protect Switch Top View of PC 1280 Internal memory only 1 INTRODUCTION PC 1280 was designed to close with a tight fit to protect its LCD screen and keyboard and has the facility for double precision calculations 2 Specifications Model PC 1280 Pocket Computer Processor 8 bit CMOS CPU Programming Language BASIC System ROM 136K Bytes Memory Capacity System internal 1 6K Bytes Approx NEN C E aaa mem Sas 208 Bytes Program Data Area 6558 Bytes FRESGIVG FICE ull aba assqa ted en meg ee deam uan 144 Bytes Memory expandable to 40KB using RAM cards Stack Sub routine 10 stacks Function 16 stacks FOR NEXT 5 stacks Data 8 stacks Bottom View of PC 1280 Operators Addition subtraction multiplication division trigonometric and inverse trigonometric functions logarithmic and exponential functions angl
16. To sense the caution level the CAU line of the G A is set active low and the state on LB of the G A is checked If LB is at a low the symbol activates When the caution label is sensed the CAU line is set off high impedance With this the voltage increases on the LB iC pin 2 because there is no more voltage division by resistors so that the output changes from low to high level As the LB line of the G A is sensed again the stop level is detected During standby 201 of the CPU and CAU of the G A are set at high impedance and Di1 is inserted to correct the battery drop during standby and operation The ON BRK and RESET switch became inoperative after the stop level has been detected CPU dp P Ch open GA CAU N ch open Fig 1 V TIN 4Vp t 1 detect IC operation Fig 2 8000 8000 9FFF 40K 1280 7 LSI Description 7 1 CPU SC61860A38 signal description Description Standby power off Address bus high during standby Write clock normally high Address latch Clock used to latch the address of the LCD driver Test pin normally low Oscillator input Oscillator output Reset input reset with a high state of signal Cassette signal input ON BRK key input normally pulled down to low level Cassette signal and buzzer signal output LCD driver control signal high during displaying LCD driver sync cl
17. e conversion square and square root sign absolute integer relational operators logical operators etc Numeric Precision 10 digits single precision mode 20 digits double precision mode mantissa 2 digits exponent Editing Features Cursor left and right line up and down character insert character delete Memory Protection CMOS Battery backup Interface Capability 11 pin For cassette interface disk printer etc Ram Card Slot Cards of 2KB 4KB 8KB 16KB or 32KB Display 2 line 24 digit liquid crystal display with 5x7 dot characters Keys 72 keys Alphabetic numeric special symbols and functions Numeric pad User defined keys SHARP CORPORATION 1280 Power Supply 6 0V DC Lithium cells type CR 2032x2 Backup Battery Built in memory backup cell type CR 2032 Power Consumption 6 0V DC 0 03W Approximately 120 hours of continuous operation under normal conditions based on 10 minutes of operation or program execution and 50 minutes of display per hour at a temperature of 20 C The time may vary slightly depending on usage and the type of battery used Operating Temperature 0 40 C 32 140 F CE 127R CE 126P 3 Operating Battery Life and Consumption Power Consumption current PC 1280 When ON 4004A max The above is at the room temperature of 20 C and may vary depending on conditions 4 Battery Replacement Replacing the operating cells 1 Turn
18. ock Key input key strobe SBnRASCPMPNONF WD Key input key strobe low during standby Not used Not used Not used 11 ACK acknowledge on 1 1 pin interface 11 pin DIN data input on 11 pin interface 11 pin DOUT data output on 11 pin interface 11 pin 02 data input on 11 pin interface 11 pin 101 data input on 11 pin interface VM LCD drive power VA LCD drive power GND supply H1 LCD backplate signal 4 level pulse during displaying 1 14 duty l H14 LCD backplate signal 4 level pulse during displaying 1 14 duty H15 H16 Not used because of 1 14 duty VB LCD drive power high during standby VDIS LCD drive power high during standby LCD drive power high during VDC LCD drive power high during standby VGG supply 08 In Out Data bus D7 normally high impedance l 1 O1 In Out Data bus DO normally high impedance Out Gate array chip enable CE Out ROM chip enable Out RAM card bank select BA _ Notused Out Low battery detect high impedance during standby Address bus A15 high during standby e N N N N N N Address bus high during standby 1280 7 2 Gate array LZ92K38 signal description In Out Description Bank select Chip enable Data bus Databus supply 11 pin IO1 P channel open output 11 pin 02 P channel open output 11 pin DOUT P channel open output 11
19. pin DIN P channel open output 11 pin BUSY P channel open output Not used Not used Not used System ROM 14 and RAM A11 System ROM 15 and RAM A12 System ROM 16 and RAM A13 RAM card slot A15 RAM card A16 RAM card slot chip enable Internal RAM chip enable DISPCHIP1 chip enable DISPCHIP2 chip enable Reset output to CPU RESET line normally low ON BRK output to CPU KON line normally low Low battery detect low at battery low Reset input normally pulled down ON BRK key input normally pulled down supply supply Low battery symbol activating voltage detect line high impedance after the activation of the symbol Key strobe P channel open output Key strobe P channel open output Write clock Address bus Address bus 1280 8 Service Precautions 2 Do the reverse sequence of the above to assemble wen NOTE When removing CAB A be careful not to separate the static Each cabinet is called as follows tape Display side bottom cabinet CAB A Display side top cabinet CAB B 8 2 Installation of CAB C Mi Ba seat sure that is properly engaged into the hole 2 When mating to CAB D push all the way in the arrowhead A to achieve firm engagement Tighten the screw with the unit placed on the special table 8 1 Removal installation of Procedure
20. se To replace one of the cabinets it is possible to remove the spring pin by scraping off the cabinet body using such as wire cutter but the spring pin once removed may not be used again 9 Check Out with the Test Program A test program is contained in the ROM Check item 1 RAM card read after write test 2 11 pin connector line tests 3 15 pin connector VO line tests NOTE The above item 3 is not used by the 1280 Tools required The PC 1360 special tool UKOGC3020CSZZ price rank is used for 2 and 3 Description The RAM contents must be saved on such as tape before conducting the above test item 1 because the program and data are destroyed during the test Power OFF Turn power on with the following four keys depressed at the same time 1280 JA pe 22 mB 1475 2 11 3 15PIN Type 1 RAM test Type 2i 2 11 pin check Type 3 3 15 check Not necessary for the PC 1280 Power OFF NOTE 1 Power can be turned off while the above message is on display 2 test program fails to start check keys first POWER switch e Details of check items 1 RAM test Menu m XRAMI B 4K D 16K A 2K C 8K 32 P PASS D E 1 xW AIT 1 ERROR OCCURED AT H lt RAM2 gt D 16K A 2K C 8K E 3
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