Circuit Description - Casio CTK-431 Service Manual

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KEY MATRIX
KI0
KO0
C2
KO1
C#2
KO2
D2
KO3
D#2
KO4
E2
KO5
F2
KO6
F#2
KO7
G2
KO8
KO9
3
KO10
6
KO11
9
KO12
FF
NOMENCLATURE OF KEYS
C#2 D#2
F#2 G#2 A#2
C2
D2
E2
F2
G2
A2
B2

CIRCUIT DESCRIPTION

KI1
KI2
G#2
E3
A2
F3
A#2
F#3
B2
G3
C3
G#3
C#3
A3
D3
A#3
D#3
B3
+
0
2
1
5
4
7
8
Chord
Play/
Right
Pause
C#3 D#3
F#3 G#3 A#3
C3
D3
E3
F3
G3
A3
B3
— 3 —
KI3
KI4
C4
G#4
C#4
A4
D4
A#4
D#4
B4
E4
C5
F4
C#5
F#4
D5
G4
D#5
Tempo
Tempo
Down
Up
Start/
Synchro/
Stop
Fill-in
Transpose/
Song
Tune
Bank
Fingered
CASIO
Stop
Left
C#4 D#4
F#4 G#4 A#4
C4
D4
E4
F4
G4
A4
B4
KI5
KI6
E5
C6
F5
F#5
G5
G#5
A5
A#5
B5
Volume
Volume
Down
Up
Chord
Accomp
Book
Volume
Rhythm
Tone
Normal
Power Off
Rewind
C#5 D#5
F#5 G#5 A#5
C5
D5
E5
F5
G5
A5
B5
C6

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