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CONTENTS

1. SCHEMATIC DIAGRAM.................................................................................................... 1

1-1. MAIN PCB.................................................................................................................. 1

1-2. KEY MATRIX ............................................................................................................. 2

2. SPECIFICATIONS ............................................................................................................. 3

3. TO REPLACE THE BATTERIES....................................................................................... 5

4. DATA TRANSFER............................................................................................................. 6

5. OPERATION REFERENCE............................................................................................. 10

5-1. RESET OPERATION ............................................................................................... 10

5-2. TO ADJUST THE DISPLAY CONTRAST ............................................................... 11

5-3. TO CHECK THE MEMORY STATUS ...................................................................... 11

5-4. THE SOUND MENU................................................................................................. 11

6. LSI, IC (Pin function) ...................................................................................................... 12

6-1. CPU.......................................................................................................................... 12

6-2. RAM:

µPD43256G-101215LL (LSI2,LSI3) ............................................................... 13

6-3. VOLTAGE REGULATOR:S-81253SGUP (REG1) .................................................. 14

6-4. VOLTAGE DETECTOR:S-80752AN (DET1)........................................................... 14

7. TROUBLESHOOTING..................................................................................................... 15

8. HARD CHECK ................................................................................................................. 18

9. ASSEMBLY VIEW ........................................................................................................... 23

10. PARTS LIST .................................................................................................................... 25

Casio SF-4400 Service Manual & Parts List

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