Casio TK-6500 Series, Service Manual

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CONTENTS
TK-6500 Page
1. SPECIFICATIONS ........................................................................................ 1
2. INITIALIZE (MAC) OPERATION .................................................................. 4
3. F-INIT (FMAC) OPERATION ....................................................................... 4
4. BLOCK DIAGRAM ....................................................................................... 5
5. TO OPEN THE UPPER CASE ..................................................................... 7
6. CIRCUIT EXPLANATION ............................................................................ 9
6-1. Power supply circuit .................................................................................................. 9
6-2. Reset and power down circuit ................................................................................. 10
6-3. CPU description ........................................................................................................ 11
6-4. Momory chip selection circuit ................................................................................. 13
6-5. Flash ROM1 address circuit .................................................................................... 14
6-6. Flash Pack circuit (Memory Cassette RAC-9) ........................................................ 14
6-7. Memory map ............................................................................................................. 15
6-8. Printer drive circuit ................................................................................................... 16
6-9. RS232C port COM1 circuit ........................................................................................ 17
6-10. RS232C port COM2 circuit ...................................................................................... 17
6-11. Keyboard selection switch ..................................................................................... 18
6-12. To mount optional circuit ....................................................................................... 19
1) Clerk key circuit ........................................................................................................ 19
2) Multi-drawer circuit .................................................................................................. 21
3) Paper near end sensor circuit ................................................................................. 22
6-13. ARCNET circuit (OPTION IO-PB14) ........................................................................ 23
7. DIAGNOSTIC OPERATION ....................................................................... 29
7-1. To start the diagnostic program ............................................................................. 29
7-2. Check item ................................................................................................................ 29
7-3. Operation of each test .............................................................................................. 29
7-4. Switch status test ..................................................................................................... 30
7-5. Individual function test ............................................................................................ 31
7-6. To exit the diagnostic mode .................................................................................... 46
8. ERROR CODE LIST ................................................................................... 47
9. IC DATA ..................................................................................................... 50
10. PCB LAYOUT ............................................................................................ 61
11. CIRCUIT DIAGRAM ................................................................................... 63
12. PARTS LIST ............................................................................................... 85