Table Of Contents - Casio CE-300 (EX-247) Service Manual

1. SPECIFICATIONS ................................................................................................ 1
2. INITIALIZE (MAC) OPERATION .......................................................................... 1
3. BLOCK DIAGRAM
3-1. PCB connection ......................................................................................... 2
3-2. Block diagram (circuit) .............................................................................. 3
4. CIRCUIT EXPLANATION
4-1. Power supply circuit .................................................................................. 4
4-2. CPU (uPD78052GC-093-3B9) .................................................................... 5
4-3. Display controller (uPD16312GB-3B4) ..................................................... 7
4-4. Initialize IC (Reset circuit) ......................................................................... 8
4-5. Power down detection circuit (PWD) ....................................................... 8
4-6. Address latch circuit ................................................................................. 8
4-7. RAM / ROM bank selection circuit ............................................................ 9
4-8. Head drive circuit for printer................................................................... 10
4-9. Vpp sensor circuit .................................................................................... 11
4-10. Power supply circuit for display ............................................................. 11
5. DIAGNOSTIC
5-1. To start the diagnostic program ............................................................. 12
5-2. Check item ................................................................................................ 12
5-3. Operation of each test ............................................................................. 12
5-4. To exit the diagnostic test ....................................................................... 17
6. ERROR CODE
6-1. Operation error code ............................................................................... 18
6-2. System lock code..................................................................................... 19
7. IC DATA
1. TC74HC00AP ............................................................................................ 20
2. TC74HC08AP ............................................................................................ 20
3. TC74HC138 ............................................................................................... 20
4. TC74HC367AP .......................................................................................... 21
5. TL431CLPB ............................................................................................... 21
6. TC74HC373AP .......................................................................................... 21
7. S-80745 / S-80719 ..................................................................................... 22
8. M5237L ...................................................................................................... 22
9. MAX232 ..................................................................................................... 22
8. PCB LAYOUT ..................................................................................................... 23
9. CIRCUIT DIAGRAMS ......................................................................................... 25
10. PARTS LIST ....................................................................................................... 41
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