Casio AP-22S Service Manual page 18

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6.
A certain button does not function
7.
A certain tone is strange when record/playback
Replace the console PCBs.
Does the button function?
No
Replace MA1M PCB.
Check the cord of pedal unit
Is it disconnected?
No
Replace the main PCB.
— 18 —
Yes
End
Yes
Connect the cord

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