Casio CTK-500 Service Manual

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Power IC (IC1: CA5668)
The power IC generates three voltages AVDD (+5 V) for the CPU and the reset IC, AVDD (+5 V) for the
analog circuit, and VCC (+9 V) for the power amplifier. VDD (+5 V) is always generated, but AVDD (+5 V)
and VCC (+ 9V) are controlled by the APO signal.
KO0
KO1
KO2
KO3
KO4
KO5
KO17
D3
D5
D2
D6
D1
D4
Q3
Q5
Q2
Q6
Q1
Q4
L0
L1
L2
L3
L4
L5
CPU
MSM6626-01
LSI1
LED Driver
TC74CH174AP
IC3
Chord Memory Play
Solo Sound
Duo Sound
Ensenble Sound
Beat (Jukebox)
Ad-Lib Musician
VDD
CLK
CLR
LED Driving
VDD
AVDD
VCC
APO
VIN
VDIN
GND
CA5668
IC1
+9V
APO VDD AVDD VCC
0 V +5 V 0 V 0 V
+5 V +5 V +5 V +9 V

Casio CTK-500 Specifications

General

Brand	Casio
Model	CTK-500
Category	Electronic Keyboard
Language	English