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IC303, 401 LC75392
LVROUT
1
2
LVRIN
LTOUT
3
LTCOM
4
LT4
5
LT3
6
LT2
7
LT1
8
L4
9
L3
10
L2
11
L1
12
VDD
13
CL
14
15
DI
IC502 uPC1237HA
OVER
LOAD DET
OFFSET DET
LATCH
AUTORESET
AC OFF
DET
1
2
3
4
— PANEL SECTION —
IC603 BU2114
SIN
1
SHIFT
REGISTER
CK
2
3
LATCH
LATCH
SOUT
4
EN
5
ENABLE
RST
6
GND
7
GND
8
+
–
LATCH
DECODER
SHIFT
REGISTER
CONTROL
V
ON
CC
F/F
MUTE
V
CC
5
6
7
8
18
VDD
17
O1
16
O2
15
O3
14
O4
13
O5
12
O6
11
O7
10
O8
9
GND
IC501 STK405-070A
30
RVROUT
29
RVRIN
28
RTOUT
1
2
3
27
RTCOM
26
RT4
25
RT3
24
RT2
23
RT1
22
R4
21
R3
20
R2
19
R1
VREF
18
VSS
17
16
CE
— 33 —
+
ch.2
–
+
ch.1
–
GND
4
5
6
8
9
10
11
12
13
14
7
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