Circuit Description - Casio CTK-4200 Service Manual

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„ KEY MATRIX
KC0
FI0
C2
1
SI0
C2
2
FI1
G2#
1
SI1
G2#
2
FI2
E3
1
SI2
E3
2
FI3
C4
1
SI3
C4
2
FI4
G4#
1
SI4
G4#
2
FI5
E5
1
SI5
E5
2
FI6
C6
1
SI6
C6
2
FI7
G6#
1
SI7
G6#
2
Each key has two contacts, the first contact
NOTE: The diagram below illustrates how the contacts work.
Second contact
„ NOMENCLATURE OF KEYS
C2

CIRCUIT DESCRIPTION

KC1
KC2
C2#
D2
1
1
C2#
D2
2
2
A2
A2#
1
1
A2
A2#
2
2
F3
F3#
1
1
F3
F3#
2
2
C4#
D4
1
1
C4#
D4
2
2
A4
A4#
1
1
A4
A4#
2
2
F5
F5#
1
1
F5
F5#
2
2
C6#
D6
1
1
C6#
D6
2
2
A6
A6#
1
1
A6
A6#
2
2
1
Key
First contact
C3
C4
KC3
KC4
D2#
E2
1
1
D2#
E2
2
2
B2
C3
1
1
B2
C3
2
2
G3
G3#
1
1
G3
G3#
2
2
D4#
E4
1
1
D4#
E4
2
2
B4
C5
1
1
B4
C5
2
2
G5
G5#
1
1
G5
G5#
2
2
D6#
E6
1
1
D6#
E6
2
2
B6
C7
1
1
B6
C7
2
2
and second contact
.
2
FI
KC
SI
C5
– 5 –
CTK-4200
KC5
KC6
F2
F2#
1
1
F2
F2#
2
2
C3#
D3
D3#
1
1
C3#
D3
D3#
2
2
A3
A3#
1
1
A3
A3#
2
2
F4
F4#
1
1
F4
F4#
2
2
C5#
D5
D5#
1
1
C5#
D5
D5#
2
2
A5
A5#
1
1
A5
A5#
2
2
F6
F6#
1
1
F6
F6#
2
2
C6
KC7
G2
1
G2
2
1
2
B3
1
B3
2
G4
1
G4
2
1
2
B5
1
B5
2
G6
1
G6
2
C7

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