Casio CTK-431 User Manual download pdf (Page 4)

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BLOCK DIAGRAM

CPU

MSM 6755C-17

LSI1

Keyboard

Buttons

LCD

LCD Driver

KS0066U-10B

LSI3

Reset IC

IC1

Oscillator

X1, Q1

Power Supply Circuit

Q101 ~ Q103, D104

Power Amp.

LA4598

IC101

Filter

Q105

Speaker

(L)

Speaker

(R)

Phones/Output

VC

AVDDVCC DVDD

APO

MD0 ~ MD7

MA0 ~ MA17

DC + 9 V IN

DB4 ~ DB7

COM1 ~ COM16

SEG1 ~ SEG40

RS

R/W

E

KO8 ~

KO12

KI0 ~ KI6

KO0 ~ KO7

ROM(2M-bit)

UM23C2101M

7384/Q

LSI2

Power Switch

1 2 3 4 5 6 7 8 9 ... 18 19

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