Casio LX-552A Service Manual & Parts List Download | Manualshive

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MA0400751A

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Summary of Contents for LX-552A

Page 1: ...SF 7900E LX 552A SF 8900 LX 552I J R with price without price SF 7900E JAN 1995...

Page 2: ...LANATIONS System chart 9 Power supply circuit 10 CPU pin description HD62076C03 12 Gate array pin descriptions SSC2571F0A 13 Gate array pin descriptions SSC2571F0B 14 Operation program ROM pin descrip...

Page 3: ...256KB 234508 bytes Main component LSI Power supply 3 lithium batteries CR2032 Power consumption 0 07 W Battery life Approximately 170 hours continuous operation in Telephone Directory approximately 1...

Page 4: ...tery compartment cover in place and remove the cover Caution In the next step be sure to remove only one battery at a time Otherwise you will lose all data stored in memory 2 Loosen the screw that sec...

Page 5: ...t to set a Schedule Set a different alarm time ALREADY PASSED Keeper alarm time for a for a future time date time date that is already passed SECRET DATA Alarm for a secret Enter the secret memory mem...

Page 6: ...ESET button with a thin pointed object Warning The next step deletes all data stored in the SF unit s memory Make sure that you really want to delete the data before you continue 2 Press Y to reset th...

Page 7: ...protection only when replacing the LCD or the outer case How to transfer the data Before connecting the cable SB 60 or SB 62 be sure to reset the slave unit to clear all data 1 Turn off the power swit...

Page 8: ...unit is ready to receive data 6 Set up the customer s unit 1 While the transmitting unit is in the Calendar Display Telephone Directory Business Card Library Memo Mode or Schedule Keeper press the FU...

Page 9: ...lem occurs during data communications All data transferred up to display of the message is retained in memory but data communication is terminated If one of the following error messages appear press t...

Page 10: ...SSION DATA RECEPTION OPEN OFF MSM6585AV Z 358B LCD DRIVER LCD DRIVER MSM6585AV Z 358B MAIN SWITCH BLOCK DIAGRAM CD760 TS VDD GND SSC2571 LSI2 HD62076C03 LSI1 PCB L589 E4 TO KEYBOARD KEYBOARD RAM MSM51...

Page 11: ...from KAC terminal 7 Push power on button switch 8 CPU oscillation is generated 9 Output H from V2ON terminal 10 Output L from VOB terminal OFF CIRCUIT EXPLANATIONS CPU HD62076C03 PDN L SWO L 2 3 5 4 6...

Page 12: ...1 generates the signal to turn the display ON on the terminal V2ON Pin No 45 This signal goes to the terminal VIN Pin No 24 of the GATE ARRAY LSI2 then the GATE ARRAY LSI2 generates L level on the ter...

Page 13: ...up the system When the PDN terminal will be receiving L level GATE ARRAY will send L signal from KON termi nal for cutting the line of power on switch HD62076C03 from IC4 Pin35 VOB VIN L V2ON CPU GND...

Page 14: ...ut signal 54 KAC Out L Pulse Power on switch signal output 55 65 67 KC0 KC11 Out H Pulse Key common signal output 66 GND In L L GND terminal 68 INT2 In H H Interrupt signal from Gate array 69 INT1 In...

Page 15: ...signal 27 IO3 In Out Data bus line 28 VOB Out Inverted signal for VIN 29 IO4 In Out Data bus line 30 INT Out Interrupt signal 31 VH2 VCC In 9V input 32 VL2 VLL In 6V input 33 VSS GND In GND terminal 3...

Page 16: ...Transmission data input from CPU 19 WEI In Write enable signal from CPU 20 GC In GC signal from CPU 21 IO0 In Out Data bus line 22 DT In DT signal input 23 IO1 In Out Data bus line 24 VIN In Power ON...

Page 17: ...pin descriptions RAM pin descriptions Pin No Name In Out Status Status Description of OFF of ON 3 12 23 A0 A15 In L Pulse Address bus line A0 A15 25 28 31 13 15 17 21 IO0 IO7 Out L Pulse Data bus lin...

Page 18: ...creen The each test can be selected by numeral keys SELF TEST PROG PRESS SET QUIT BY OFF CASIO 1993 11 09 MENU TOP SHEET 1 DISP CHECK 2 RAM TEST 3 MEMORY TEST 4 KEY BUZZER 5 INTERFACE CASIO 1993 11 09...

Page 19: ...2 Test data pattern FF FE FD MENU RAM 1 1 DATE WRITE 2 DATA READ 3 PAT CHANGE 4 5 CASIO 1993 11 09 The unit will beep after a second The menu will be appeared 1 RAM write RAM WRITING 1 NOW EXECUTING...

Page 20: ...SORY Limits the mode mentioned above so that the keys must be pressed according to the key code If an error is made a buzzer sounds for about 1 second A correct entry results in a beep tone CHECKSUM C...

Page 21: ...H38 by the Xon Xoff control 2 key Reception mode Make sure to set the parameter to match that of the transitting side The data received appears on the display 3 key Output the following ASCII code by...

Page 22: ...ansmission Error display 7 Others 1 When power is off after presetting an alarm time the unit automatically powered on at the alarm time However the display is not reserved in this case 2 When executi...

Page 23: ...ortage Replace batteries Poor soldering of the power supply Resolder circuit Defective LSI 1 or LSI 2 Replace it No display at all or wrong Defective TAB LSI Replace it display Defective heat seal Rep...

Page 24: ...23 SCHEMATIC DIAGRAM Main PCB SF 7900E Note The following parts are not mounted C16 R24 IC4 D2 Q5 R22 R27 R28 R29 S 80766AH O O O O RH5VA60BA O O O...

Page 25: ...24 Main PCB SF8900...

Page 26: ...25 Display PCB...

Page 27: ...26 Key Matrix...

Page 28: ...27 Key Matrix Display side...

Page 29: ...5 2011 9478 LSI UPD23C4001EBGW J14 1 1 1 1 630 A Q1 2221 0378 Chip transistor 2SC2812 L5 L6 TB 1 1 1 20 12 B Q2 2200 4417 Transistor 2SA1179M5 M6 TB 1 1 1 20 15 B Q4 2259 0959 Chip digital transistor...

Page 30: ...0 9 X 25 6512 1220 Pin L FC002870018 2 2 2 20 16 X N 26 6414 1250 Lower case DIS FABDB212031 1 0 0 1 110 X N 26 6414 3860 Lower case DIS FABDB212049 0 0 1 1 110 X N 26 6414 1350 Lower case DIS FABDB21...

Page 31: ...31 26 35 4 10 8 9 7 6 44 12 31 46 21 40 24 25 23 38 42 35 37 41 20 19 14 15 32 VR1 3 J1 44 39 1 30 45 37 43 22 29 43 37 17 18 28 13 33 27 36 2 34 11 5 37 16 37 ASSEMBLY VIEW...

Page 32: ...MA0400751A...

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