Casio WK-1200, Service Manual

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CIRCUIT DESCRIPTION
KEY MATRIX
Note: Each key has two contacts,
the first conatct (1) and second contact (2).
Key
Second contact (2) First contact (1)
KC
SI
FI
0 C K 1 C K 2 C K 3 C K 4 C K 5 C K 6 C K 7 C K
0 I F ) 1 ( 1 C ) 1 ( 1 # C ) 1 ( 1 D ) 1 ( 1 # D ) 1 ( 1 E ) 1 ( 1 F ) 1 ( 1 # F ) 1 ( 1 G
0 I S ) 2 ( 1 C ) 2 ( 1 # C ) 2 ( 1 D ) 2 ( 1 # D ) 2 ( 1 E ) 2 ( 1 F ) 2 ( 1 # F ) 2 ( 1 G
1 I F ) 1 ( 1 # G ) 1 ( 1 A ) 1 ( 1 # A ) 1 ( 1 B ) 1 ( 2 C ) 1 ( 2 # C ) 1 ( 2 D ) 1 ( 2 # D
1 I S ) 2 ( 1 # G ) 2 ( 1 A ) 2 ( 1 # A ) 2 ( 1 B ) 2 ( 2 C ) 2 ( 2 # C ) 2 ( 2 D ) 2 ( 2 # D
2 I F ) 1 ( 2 E ) 1 ( 2 F ) 1 ( 2 # F ) 1 ( 2 G ) 1 ( 2 # G ) 1 ( 2 A ) 1 ( 2 # A ) 1 ( 2 B
2 I S ) 2 ( 2 E ) 2 ( 2 F ) 2 ( 2 # F ) 2 ( 2 G ) 2 ( 2 # G ) 2 ( 2 A ) 2 ( 2 # A ) 2 ( 2 B
3 I F ) 1 ( 3 C ) 1 ( 3 # C ) 1 ( 3 D ) 1 ( 3 # D ) 1 ( 3 E ) 1 ( 3 F ) 1 ( 3 # F ) 1 ( 3 G
3 I S ) 2 ( 3 C ) 2 ( 3 # C ) 2 ( 3 D ) 2 ( 3 # D ) 2 ( 3 E ) 2 ( 3 F ) 2 ( 3 # F ) 2 ( 3 G
4 I F ) 1 ( 3 # G ) 1 ( 3 A ) 1 ( 3 # A ) 1 ( 3 B ) 1 ( 4 C ) 1 ( 4 # C ) 1 ( 4 D ) 1 ( 4 # D
4 I S ) 2 ( 3 # G ) 2 ( 3 A ) 2 ( 3 # A ) 2 ( 3 B ) 2 ( 4 C ) 2 ( 4 # C ) 2 ( 4 D ) 2 ( 4 # D
5 I F ) 1 ( 4 E ) 1 ( 4 F ) 1 ( 4 # F ) 1 ( 4 G ) 1 ( 4 # G ) 1 ( 4 A ) 1 ( 4 # A ) 1 ( 4 B
5 I S ) 2 ( 4 E ) 2 ( 4 F ) 2 ( 4 # F ) 2 ( 4 G ) 2 ( 4 # G ) 2 ( 4 A ) 2 ( 4 # A ) 2 ( 4 B
6 I F ) 1 ( 5 C ) 1 ( 5 # C ) 1 ( 5 D ) 1 ( 5 # D ) 1 ( 5 E ) 1 ( 5 F ) 1 ( 5 # F ) 1 ( 5 G
6 I S ) 2 ( 5 C ) 2 ( 5 # C ) 2 ( 5 D ) 2 ( 5 # D ) 2 ( 5 E ) 2 ( 5 F ) 2 ( 5 # F ) 2 ( 5 G
7 I F ) 1 ( 5 # G ) 1 ( 5 A ) 1 ( 5 # A ) 1 ( 5 B ) 1 ( 6 C ) 1 ( 6 # C ) 1 ( 6 D ) 1 ( 6 # D
7 I S ) 2 ( 5 # G ) 2 ( 5 A ) 2 ( 5 # A ) 2 ( 5 B ) 2 ( 6 C ) 2 ( 6 # C ) 2 ( 6 D ) 2 ( 6 # D
8 I F ) 1 ( 6 E ) 1 ( 6 F ) 1 ( 6 # F ) 1 ( 6 G ) 1 ( 6 # G ) 1 ( 6 A ) 1 ( 6 # A ) 1 ( 6 B
8 I S ) 2 ( 6 E ) 2 ( 6 F ) 2 ( 6 # F ) 2 ( 6 G ) 2 ( 6 # G ) 2 ( 6 A ) 2 ( 6 # A ) 2 ( 6 B
9 I F ) 1 ( 7 C
9 I S ) 2 ( 7 C
NOMENCLATURE OF KEYS
C2
C#2 D#2 F#2 G#2 A#2 C#3 D#3 F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5 C#6 D#6 F#6 G#6 A#6
D2 E2 F2 G2 A2 B2 C1 D1 E1 F1 G1 A1 B1 C3 D3 E3 F3 G3 A3 B3
C#1 D#1 F#1 G#1 A#1
C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 D6 E6 F6 G6 A6 B6 C6 C7