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AT-1
Casio AT-1 User Manual
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— 20 —
B C E
E C B
E C B
CLEAR
Q1
D1
D2
Q2
D3
Q3
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
Q6
D6
D5
Q5
D4
Q4
CLOCK
R
D
CK
Q
R
D
CK
Q
R
D
CK
Q
R
D
CK
Q
R
D
CK
Q
R
D
CK
Q
NC
I1
I2
I3
I4
I5
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
NC
O5
O4
O3
O2
O1
NC
BA612
TC74HC174AP
2SB1274
2SB1240Q,R
2SC1740SQ
2SA933SQ
DTA114TS
1 2 3
S-81350HG
21
23
Table of Contents
Table of Contents
2
Specifications
3
Replacing the DSP (HG51B155FD)
4
Block Diagram
5
Circuit Description
6
Button Matrix
7
Filter Block
12
Wiring Diagram
14
Major Waveforms
15
PCB View and Major Check Points
16
Schematic Diagrams
17
Exploded View
20
IC Lead Identification and Internal Diagram
21
Parts List
23
4
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Casio AT-1 Specifications
General
Brand
Casio
Model
AT-1
Category
Electronic Keyboard
Language
English
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