— 3 —
CIRCUIT DESCRIPTION
KEY MATRIX
FI
KC
SI
LSI (IC4)
ML6763B-NNTC-116
Second contact
First contact
1
2
NOMENCLATURE OF KEYS
F#3G#3 A#3
C#4D#4
F#4G#4A#4
C#5D#5
F#5G#5A#5
F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6
D#3
C2 D2 E2 F2 G2 A2 B2 C3 D3 E3
B6
A6
G6
F6
E6
D6
C7
C#3
A#2
G#2
F#2
D#2
C#2
C1 D1 E1 F1 G1 A1 B1
A0 B0
A#1
A#0
G#1
F#1
D#1
C#1
A#6
G#6
F#6
D#6
C#6
B7
A7
G7
F7
E7
D7
C8
A#7
G#7
F#7
D#7
C#7
BUTTON MATRIX
KC0
KC1
KC2
KC3
KC4
KC5
KC6
KC7
FI0
A0
1
A0#
1
B0
1
C1
1
C1#
1
D1
1
D1#
1
E1
1
SI0
A0
2
A0#
2
B0
2
C1
2
C1#
2
D1
2
D1#
2
E1
2
FI1
F1
1
F1#
1
G1
1
G1#
1
A1
1
A1#
1
B1
1
C2
1
SI1
F1
2
F1#
2
G1
2
G1#
2
A1
2
A1#
2
B1
2
C2
2
FI2
C2#
1
D2
1
D2#
1
E2
1
F2
1
F2#
1
G2
1
G2#
1
SI2
C2#
2
D2
2
D2#
2
E2
2
F2
2
F2#
2
G2
2
G2#
2
FI3
A2
1
A2#
1
B2
1
C3
1
C3#
1
D3
1
D3#
1
E3
1
SI3
A2
2
A2#
2
B2
2
C3
2
C3#
2
D3
2
D3#
2
E3
2
FI4
F3
1
F3#
1
G3
1
G3#
1
A3
1
A3#
1
B3
1
C4
1
SI4
F3
2
F3#
2
G3
2
G3#
2
A3
2
A3#
2
B3
2
C4
2
FI5
C4#
1
D4
1
D4#
1
E4
1
F4
1
F4#
1
G4
1
G4#
1
SI5
C4#
2
D4
2
D4#
2
E4
2
F4
2
F4#
2
G4
2
G4#
2
FI6
A4
1
A4#
1
B4
1
C5
1
C5#
1
D5
1
D5#
1
E5
1
SI6
A4
2
A4#
2
B4
2
C5
2
C5#
2
D5
2
D5#
2
E5
2
FI7
F5
1
F5#
1
G5
1
G5#
1
A5
1
A5#
1
B5
1
C6
1
SI7
F5
2
F5#
2
G5
2
G5#
2
A5
2
A5#
2
B5
2
C6
2
FI8
C6#
1
D6
1
D6#
1
E6
1
F6
1
F6#
1
G6
1
G6#
1
SI8
C6#
2
D6
2
D6#
2
E6
2
F6
2
F6#
2
G6
2
G6#
2
FI9
A6
1
A6#
1
B6
1
C7
1
C7#
1
D7
1
D7#
1
E7
1
SI9
A6
2
A6#
2
B6
2
C7
2
C7#
2
D7
2
D7#
2
E7
2
FI10
F7
1
F7#
1
G7
1
G7#
1
A7
1
A7#
1
B7
1
C8
1
SI10
F7
2
F7#
2
G7
2
G7#
2
A7
2
A7#
2
B7
2
C8
2
KI0
KI1
KC0
CONTROL
—
KC1
SPLIT
METRONOME
KC2
START/STOP
RECORD
Summary of Contents for Celviano AP-24
Page 1: ...ELECTRONIC KEYBOARD AP 24 JUN 2004 AP 24 ...
Page 6: ... 4 PRINTED CIRCUIT BOARD MAIN PCB M420 MAA1 Bottom view Top view ...
Page 19: ... 17 SCHEMATIC DIAGRAMS MAIN PCB M420 MAA1 ...
Page 20: ... 18 SUB PCB M420 PSA1 ...
Page 21: ... 19 JACK PCB M420 PSA2 ...
Page 22: ... 20 CONSOLE PCB M420 PSA3 ...
Page 23: ... 21 LED PCB M420 PSA4 ...
Page 24: ... 22 POWER SUPPLY PCB M420 ACA1 ...
Page 25: ... 23 Keyboard PCB MPCK KYA1 ...
Page 26: ... 24 Keyboard PCB MPCK KYB2 ...
Page 27: ... 25 Keyboard PCB MPCK KYA3 ...