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Block Diagram - Casio CTK-431 Service Manual

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Phones/Output
Speaker
(L)
Power Amp.
LA4598
IC101
Speaker
(R)
VC
VCC DVDD
DC + 9 V IN
Power Supply Circuit
Q101 ~ Q103, D104

BLOCK DIAGRAM

COM1 ~ COM16
LCD
KS0066U-10B
SEG1 ~ SEG40
DB4 ~ DB7
Filter
Q105
AVDD
APO
Power Switch
LCD Driver
LSI3
RS
R/W
KO8 ~
E
KO12
CPU
MSM 6755C-17
LSI1
Reset IC
Oscillator
IC1
X1, Q1
Buttons
Keyboard
KI0 ~ KI6
KO0 ~ KO7
MD0 ~ MD7
ROM(2M-bit)
UM23C2101M
MA0 ~ MA17
7384/Q
LSI2

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