Block Diagram; Circuit Description - Casio SA-65 Service Manual

LCD
S1 ~ S14
S18 ~ S20
S31 ~ S46
LCD Driver
KS0035
IC102
Amplifier
AN8053N
IC101
Speaker
Key Matrix
KI0
KO0
KO1 F3
KO2 C#4
KO3 A4
KO4 F5
KO5 0
KO6 5
Song
KO7 Pattern
Bank

BLOCK DIAGRAM

COM1, COM2
KO8 ~ KO11
Filter
Q101
VDD

CIRCUIT DESCRIPTION

KI1 KI2
F#3 G3
D4 D#4
A#4 B4
F#5 G5
1 2
6 7
Tone
CPU
MSM6387B-A28
LSI101
OUT
Oscillator
Q102, X101
KI3 KI4
C3 C#3
G#3 A3
E4 F4
C5 C#5
G#5 A5
Tempo
3 4
Volume
8 9
Start/
— 2 —
KO0 ~ KO7
KI0 ~ KI7
Keyboard
Switches
KI5 KI6
D3 D#3
A#3 B3
F#4 G4
D5 D#5
A#5 B5
Melody
Up Off
Tempo
Up Down
Volume
Stop Down
KI7
E3
C4
G#4
E5
C6