Casio AP-20 - Advanced Settings

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Does the power indicator
light up?
Check the main volume.
Is it OK?
Does the demo tune sound?
Replace keyboard PCBs.
Disconnect JA and JB
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.
2. No sound
3. Distorted sound
Check the voltage selector.
Is it at proper position?
No
Yes
Replace the main PCB.
Set the voltage selector at
proper position.