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ap-21
Casio ap-21 User Manual
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— 9 —
POWER SUPPL
Y CIRCUIT
The power supply circuit generates five voltages as shown in the following table.
Name
V
oltage
For operation of
VDD
+5 V
CPU, Reset IC, DSP
, Sound source ROM, Working storage RAM, Effect RAM,
Key touch LSI, Gute array
, LEDs
A
VDD
+5 V
DAC
A
VCC
+15 V
Filter
, Mixer
A
VFF
-15 V
Filter
, Mixer
9
11
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
4
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Casio ap-21 Specifications
General
Brand
Casio
Model
ap-21
Category
Electronic Keyboard
Language
English
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