Casio AP-22S

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2. No sound
3. Distorted sound
Does the power indicator
light up?
Check the main volume.
Is it OK?
Does the demo tune sound?
Replace keyboard PCBs.
Disconnect CA and CB
connectors on the main PCB.
Follow "No power"
troubleshooting.
No
Yes
Yes
Yes
No
No
Replace main volume.
Press Demo button.
Replace the main PCB.
Check the voltage selector.
Is it at proper position?
No
Yes
Replace the main PCB.
Set the voltage selector at
proper position.