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Circuit Description - Casio CTK-4000 Service Manual & Parts List

Electronic keyboard
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KEY MATRIX
KC0
FI0
C2
SI0
C2
FI1
G2#
SI1
G2#
FI2
E3
SI2
E3
FI3
C4
SI3
C4
FI4
G4#
SI4
G4#
FI5
E5
SI5
E5
FI6
C6
SI6
C6
FI7
G6#
SI7
G6#
Note: Each key has two contacts, the first conatct 1 and second contact 2.
NOMENCLATURE OF KEYS
C2
C3

CIRCUIT DESCRIPTION

KC1
KC2
C2#
D2
C2#
D2
A2
A2#
A2
A2#
F3
F3#
F3
F3#
C4#
D4
C4#
D4
A4
A4#
A4
A4#
F5
F5#
F5
F5#
C6#
D6
C6#
D6
A6
A6#
A6
A6#
Key
Second contact
2
C4
KC3
KC4
D2#
E2
D2#
E2
B2
C3
B2
C3
G3
G3#
G3
G3#
D4#
E4
D4#
E4
B4
C5
B4
C5
G5
G5#
G5
G5#
D6#
E6
D6#
E6
B6
C7
B6
C7
1
First contact
C5
– 5 –
KC5
KC6
F2
F2#
F2
F2#
C3#
D3
C3#
D3
A3
A3#
A3
A3#
F4
F4#
F4
F4#
C5#
D5
C5#
D5
A5
A5#
A5
A5#
F6
F6#
F6
F6#
FI
KC
SI
C6
KC7
G2
G2
D3#
D3#
B3
B3
G4
G4
D5#
D5#
B5
B5
G6
G6
C7

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