Casio ap-21 User Manual

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TROUBLESHOOTING
1. No power
Check fuse F401.
Is F401 blown up?
Check fuses F402, F403, and
F404.
Are the fuses blown up?
Are the voltages 21.6 V AC
and 8.4 V AC?
Is it OK?
Is it OK?
Measure output voltages of
the transformer.
Replace the transformer.
No
No
Replace F401.
Replace F402, F403, and
F404.
Yes
Yes
No
No
Yes
Yes
Yes
Replace main PCB. No
Replace the power switch.
Set the voltage selector at
proper position.
Check position of voltage
selector.
Check the power switch.

Casio ap-21 Specifications

General

Brand	Casio
Model	ap-21
Category	Electronic Keyboard
Language	English