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1
2
3
4
5
6
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Schematic diagram
A
board /
– 71 –
7
8
9
10
11
12
– 72 –
13
14
15
16
17
18
– 73 –
19
20
21
22
23
24
25
A BOARD : IC1004, 1401, 1902 CXA1875AM
13
12
11
1
2
9
10
LEVEL CONVERTION
LEVEL CONVERTION
SDA
14
LEVEL
CONVERTION
SCL
15
PC DECODER
POWER
ON
RESET
LATCH
LATCH
LATCH
LATCH
LATCH
LATCH
DAC
DAC
DAC
DAC
DAC
–
+
Vcc
Vcc
AMP
AMP
AMP
AMP
AMP
REG
3
4
5
6
7
8
16
A BOARD : IC2002 NJM4558M
A BOARD : IC2003, 2004 TDA7269A
+VS
8
3
1
MUTE / ST-BY
5
2
7
L + IN
7
4
L OUT
3
6
8
L -IN
GND
9
10
R -IN
4
5
2
R OUT
R + IN
11
1
6
R-VS L-VS
• A BOARD WAVEFORMS
1
2
3
4
4.0Vp-p (V)
4.0Vp-p (H)
5.0Vp-p (V)
5.0Vp-p (H)
– 74 –
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