Casio AP-10 Service Manual page 15

3. Distorted sound
4. Certain keys do not function
5. A certain key does not function
Replace PS2M PCB.
Is a sound ok?
No
Replace MA1M PCB.
Replace MA1M PCB.
Do the keys function?
No
Replace keyboard PCBs.
Clean the contact.
Does the key function?
No
Replace key contact rubber.
Does the key function?
No
Replace keyboard PCBs.
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Yes
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Yes
End
Yes
Yes
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