
2
A
B
C
D
E
F
G
H
I
J
1
3
4
5
7
AV-S77
6
29
28
Subwoofer & Rear Amplifier
JK2
MUTE
Q8
Q7
JK2
B
IC1
UPC4570
IC1
UPC4570
IC8
LM1875T
IC9
LM1875T
DC Signal Detect
Q9/Q10
Rear Speaker Lch
Rear Speaker Rch
RY1
REAR SPEAKER RELAY
SW-PRT
IC3
UPC4570
IC2
UPC4570
IC3
UPC4570
Q12
Q13
Q14
Q15
R60
R61
IC13
STK404-050
Sub Woofer
IC4/IC5
UPC4570
Q18
10
2
1
8
6
2
4
2
4
RY2
SUB WOOFER RELAY
Q19
2
4
8
6
4
1
4
1
Power
+12v
-12v
Relay Control
1
3
D14
R66
1
2
3
4
5
6
7
8
JK1
1 2 3 4
B
6 7 8
9 0 A
C
5
MUTE
Q3
Q2
JK2
B
IC10
M5218AL
IC10
M5218AL
IC11
LM1875T
IC12
LM1875T
DC Signal Detect
Q4/Q5
RY4
FRONT SPEAKER RELAY
Q1
1
3
7
5
4
1
4
1
Q22
Q21
MUTE
JK2
B
CN9
Q6
F1
RY3
IC6
IC7
D13
D17
TR1
SW-PRT
JK2
1
Protection
Circuit
Q16/Q17
3
2
+B2
-B2
+B1
-B1
SW-PRT
JK2
1
D18
D1
D2
D3
D4
JK3 Headphone out
Go to
CN310
HPSW
R86
CURRENT
DETECTOR
1
+B12V
2
AC2
3
ACG
4
ACG
5
AC1
6
AC1
7
ACG
8
AC2
JK1
1
SW-PRT
2
SW
3
FR
4
FL
5
SP-RY2
6
NC
7
GND
8
PR
9
E
10
SP-RY1
11
RL
12
MUTE
13
POWER
JK2