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Electronic Keyboard
CTK-220L
Service manual
Circuit Description; Key Matrix - Casio CTK-220L Service Manual
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KEY MATRIX
KI0
KO0
KO1
KO2
KO3
KO4
KO5
KO6
KO7
KO8
0
KO9
5
K10
Tone
K11
Step-1
LED MATRIX
LX0
LY1
D4
LY2
C4
LY3
B3
LY4
A3
LY5
E4
LY6
F4
LY7
G4
NOMENCLATURE OF KEYS
C#2 D#2
F#2 G#2 A#2
C2
D2
E2
F2
G2
A2
B2
CIRCUIT DESCRIPTION
KI1
KI2
C2
G#2
C#2
A2
D2
A#2
D#2
B2
E2
C3
F2
C#3
F#2
D3
G2
D#3
1
2
6
7
Song
Rhythm
Bank
Step-2
Step-3
LX1
LX2
D3
C3
E3
B2
F3
A2
G3
G2
C5
D5
B4
E5
A4
F5
C#3 D#3
F#3 G#3 A#3
C3
D3
E3
F3
G3
A3
B3
— 3 —
KI3
KI4
E3
C4
F3
C#4
F#3
D4
G3
D#4
G#3
E4
A3
F4
A#3
F#4
B3
G4
Start/
3
4
8
9
Down
Part
One Key
One Key
Select
Casio
Fingered
Chord
LX3
LX4
C2
G#2
D2
A#2
E2
D#4
F2
C#5
B5
D#5
A5
C6
G5
C#4 D#4
F#4 G#4 A#4
C4
D4
E4
F4
G4
A4
B4
KI5
KI6
KI7
G#4
E5
A4
F5
A#4
F#5
B4
G5
C5
G#5
C#5
A5
D5
A#5
D#5
B5
Volume
Up
Stop
Down
Volume
Synchro/
Down
Fill-In
Demo
Normal
LX5
LX6
LX7
F#2
D#2
C#2
C#3
D#3
F#3
C#4
A#3
G#3
A#4
G#4
F#4
F#5
G#5
A#5
C#5 D#5
F#5 G#5 A#5
C5
D5
E5
F5
G5
A5
B5
C6
Off
C6
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