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ap-21
Casio ap-21 User Manual
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— 12 —
2.
No sound
Does the power indicator
light up?
Check the main volume.
Is it OK?
Does the demo tune sound?
Replace keyboard PCBs.
Disconnect CA
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.
Replace PS2M PCB.
Is a sound ok?
Yes
No
Replace MA1M PCB.
End
3.
Distorted sound
12
14
Table of Contents
Table of Contents
2
Safety Notice
2
Specifications
3
Block Diagram
4
PCB Layout
5
Disassembly Instructions
6
Circuit Description
9
Major Waveforms
11
Troubleshooting
12
Power Switch
15
Wiring Diagram
15
Exploded View
16
Parts List
17
Schematic Diagrams
20
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Casio ap-21 Specifications
General
Brand
Casio
Model
ap-21
Category
Electronic Keyboard
Language
English
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