Circuit Description - Casio WK-3800 Service Manual

KEY MATRIX
KC0
FI0
SI0
FI1 B11
SI1 B12
FI2 G21
SI2 G22
FI3 D#31
SI3 D#32
FI4 B31
SI4 B32
FI5 G41
SI5 G42
FI6 D#51
SI6 D#52
FI7 B51
SI7 B52
FI8 G61
SI8 G62
FI9 D#71
SI9 D#72
Note: Each key has two contacts, the first conatct 1 and second contact 2.
NOMENCLATURE OF KEYS
E1 C2

CIRCUIT DESCRIPTION

KC1 KC2
E11 F11
E12 F12
C21 C#21
C22 C#22
G#21 A21
G#22 A22
E31 F31
E32 F32
C41 C#41
C42 C#42
G#41 A41
G#42 A42
E51 F51
E52 F52
C61 C#61
C62 C#62
G#61 A61
G#62 A62
E71 F71
E72 F72
Key
Second contact
2
C3 C4
KC3 KC4
F#11 G11
F#12 G12
D21 D#21
D22 D#22
A#21 B21
A#22 B22
F#31 G31
F#32 G32
D41 D#41
D42 D#42
A#41 B41
A#42 B42
F#51 G51
F#52 G52
D61 D#61
D62 D#62
A#61 B61
A#62 B62
F#71 G71
F#72 G72
1
First contact
C5
— 4 —
KC5 KC6
G#11 A11
G#12 A12
E21 F21
E22 F22
C31 C#31
C32 C#32
G#31 A31
G#32 A32
E41 F41
E42 F42
C51 C#51
C52 C#52
G#51 A51
G#52 A52
E61 F61
E62 F62
C71 C#71
C72 C#72
FI
KC
SI
C6 C7
KC7
A#11
A#12
F#21
F#22
D31
D32
A#31
A#32
F#41
F#42
D51
D52
A#51
A#52
F#61
F#62
D71
D72
G7