Casio sk 8 service manual

Page 2

CONTENTS
1. SCHEMATIC DIAGRAM

11. Main PCB M3123-MA1M ........................................ 1

12. Console PCB M3123-CN'IM ...................................... 2

13. LED PCB M3123-LD1M ........................................ 3

1.4. Keyboard PCB M3129-Kv1M .................................... 4
2. PCB VIEW & MAJOR CHECKPOINTS ................................. 5
3. MAJOR WAVEFORMS .............................................. 6
4. BLOCK DIAGRAM ........................ , ......... '. ............... 7
5. KEY & SWITCH MATRIX ............................................ s
6. CPU (MSM6283-05GS) .............................................. 9
7. PERCUSSION GENERATOR IMSM6294-02) ............................. 11
3. MELODY CIRCUIT ................................................. 12
9. SAMPLING CIRCUIT ............................................... 13
1o. PERIPHERAL DEVICE ACCESS ...................................... 14
11. ROM PACK ACCESS ............................................... 15
12. LED DRIVE CIRCUIT .............................................. 16
13. RESET & POWER ON/OFF DETECTION CIRCUITS ...................... 17
14. POWER SUPPLY CIRCUIT ........................................... 18
15. TROUBLESHOOTING '. ............................................. 19
PARTS LIST

SI(-8 ............................................................. 20

SI<-BA ........................................................... 27

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