Circuit Description; Key Matrix - Casio WK-1200 Service Manual

KEY MATRIX

K C 0 K
F 0 I C 1 ( ) 1 C #
S 0 I C 1 ( ) 2 C #
F 1 I G # 1 ( ) 1 A
S 1 I G # 1 ( ) 2 A
F 2 I E 2 ( ) 1 F
S 2 I E 2 ( ) 2 F
F 3 I C 3 ( ) 1 C #
S 3 I C 3 ( ) 2 C #
F 4 I G # 3 ( ) 1 A
S 4 I G # 3 ( ) 2 A
F 5 I E 4 ( ) 1 F
S 5 I E 4 ( ) 2 F
F 6 I C 5 ( ) 1 C #
S 6 I C 5 ( ) 2 C #
F 7 I G # 5 ( ) 1 A
S 7 I G # 5 ( ) 2 A
F 8 I E 6 ( ) 1 F
S 8 I E 6 ( ) 2 F
F 9 I C 7 ( ) 1
S 9 I C 7 ( ) 2
Note: Each key has two contacts,
the first conatct (1) and second contact (2).
NOMENCLATURE OF KEYS
C#1 D#1 F#1 G#1 A#1 C#2 D#2
C1 D1 E1 F1 G1 A1 B1 C2 D2 E2 F2 G2 A2 B2

CIRCUIT DESCRIPTION

C 1 K C 2
1 ( ) 1 D 1 ( ) 1 D
1 ( ) 2 D 1 ( ) 2 D
1 ( ) 1 A # 1 ( ) 1 B
1 ( ) 2 A # 1 ( ) 2 B
2 ( ) 1 F # 2 ( ) 1 G
2 ( ) 2 F # 2 ( ) 2 G
3 ( ) 1 D 3 ( ) 1 D
3 ( ) 2 D 3 ( ) 2 D
3 ( ) 1 A # 3 ( ) 1 B
3 ( ) 2 A # 3 ( ) 2 B
4 ( ) 1 F # 4 ( ) 1 G
4 ( ) 2 F # 4 ( ) 2 G
5 ( ) 1 D 5 ( ) 1 D
5 ( ) 2 D 5 ( ) 2 D
5 ( ) 1 A # 5 ( ) 1 B
5 ( ) 2 A # 5 ( ) 2 B
6 ( ) 1 F # 6 ( ) 1 G
6 ( ) 2 F # 6 ( ) 2 G
F#2 G#2 A#2 C#3 D#3 F#3 G#3 A#3
C3 D3 E3 F3 G3 A3 B3
K C 3 K C 4
# 1 ( ) 1 E 1 ( ) 1 F
# 1 ( ) 2 E 1 ( ) 2 F
1 ( ) 1 C 2 ( ) 1 C
1 ( ) 2 C 2 ( ) 2 C
2 ( ) 1 G # 2 ( ) 1 A
2 ( ) 2 G # 2 ( ) 2 A
# 3 ( ) 1 E 3 ( ) 1 F
# 3 ( ) 2 E 3 ( ) 2 F
3 ( ) 1 C 4 ( ) 1 C
3 ( ) 2 C 4 ( ) 2 C
4 ( ) 1 G # 4 ( ) 1 A
4 ( ) 2 G # 4 ( ) 2 A
# 5 ( ) 1 E 5 ( ) 1 F
# 5 ( ) 2 E 5 ( ) 2 F
5 ( ) 1 C 6 ( ) 1 C
5 ( ) 2 C 6 ( ) 2 C
6 ( ) 1 G # 6 ( ) 1 A
6 ( ) 2 G # 6 ( ) 2 A
Key
Second contact (2)
C#4 D#4 F#4 G#4 A#4 C#5 D#5
C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5
— 4 —
K C 5 K C 6
1 ( ) 1 F # 1 ( ) 1 G
1 ( ) 2 F # 1 ( ) 2 G
# 2 ( ) 1 D 2 ( ) 1 D
# 2 ( ) 2 D 2 ( ) 2 D
2 ( ) 1 A # 2 ( ) 1 B
2 ( ) 2 A # 2 ( ) 2 B
3 ( ) 1 F # 3 ( ) 1 G
3 ( ) 2 F # 3 ( ) 2 G
# 4 ( ) 1 D 4 ( ) 1 D
# 4 ( ) 2 D 4 ( ) 2 D
4 ( ) 1 A # 4 ( ) 1 B
4 ( ) 2 A # 4 ( ) 2 B
5 ( ) 1 F # 5 ( ) 1 G
5 ( ) 2 F # 5 ( ) 2 G
# 6 ( ) 1 D 6 ( ) 1 D
# 6 ( ) 2 D 6 ( ) 2 D
6 ( ) 1 A # 6 ( ) 1 B
6 ( ) 2 A # 6 ( ) 2 B
First contact (1)
F#5 G#5 A#5 C#6 D#6 F#6 G#6 A#6
C6 D6 E6 F6 G6 A6 B6
K C 7
1 ( ) 1
1 ( ) 2
# 2 ( ) 1
# 2 ( ) 2
2 ( ) 1
2 ( ) 2
3 ( ) 1
3 ( ) 2
# 4 ( ) 1
# 4 ( ) 2
4 ( ) 1
4 ( ) 2
5 ( ) 1
5 ( ) 2
# 6 ( ) 1
# 6 ( ) 2
6 ( ) 1
6 ( ) 2
FI
KC
SI
C7