A
1
2
3
4
5
6
7
8
9
B
C
D
E
F
G
H
I
J
K
L
NX-SW77 SCHEMATIC DIAGRAM (AMP)
45
AV-S77
★
All voltage are measured with a 10MΩ /V DC electric volt meter.
★
Components having special characteristics are marked
s
and must be replaced
with parts having specifications equal to those originally installed.
★
Schematic diagram is subject to change without notice.
1
9
M5218AL
1
8
2SA1015
2SC1815
2SC2878
2SC1740S
2SK304
1SS133
MTZ12B
LM1875T
µ
PC4570HA
STK404-050
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
1
10
5
1
E C
B
E C
B
S G
D
Anode
Cathode
MUTING
POWER AMP
DC SIGNAL DETECT
POWER
AMP
CURRENT
DETECTOR
PROTECTION
WHITE
SYSTEM
CONNECTOR
BLACK
SYSTEM
CONNECTOR
FRONT
SPEAKER
RELAY
SUBWOOFER RELAY
DC SIGNAL DETECT
REAR
SPEAKER
RELAY
Page 46
FR
OM PO
WER
B1
Page 45
FR
OM CA6
H6
Page 45
FR
OM CA5
H3
Page 45
FR
OM CA6
H6
Page 46
FR
OM PO
WER
D1
Page 45
TO CN8
H3
Page 46
FR
OM PO
WER
G1
Page 46
FR
OM PO
WER
F1
Page 45
FR
OM CA6
H7
Page 45
TO CN5
A4
Page 46
FR
OM PO
WER
E1
Page 45
TO CN7
A5
Page 45
TO CN6
A2
SYSTEM
CONNECTOR
A
SPEAKERS
PHONES
C
SYSTEM
CONNECTOR
B
s
s
s
s
s
s
s
s
MAIN L
(FRONT L)
REAR L
LFE (SW)
0
0
11.8
-11.6
-11.4
24.8
-25.0
0
0
0
0
0
-11.4
0
0
0
24.8
-25.0
0
0
0
24.8
4.5
0
-25.0
0
0
0
24.8
-25.0
0
0
0
0
4.5
0
0.7
0.1
0
0
4.5
0
0
4.5
0
0.7
0.1
0
0
24.7
0.1
24.7
0.1
0
-11.4
0
0
-11.4
0
0
-11.4
0
0
-11.4
0
0
0
0
0
0
-11.6
11.8
0
0
0
0
11.8
-11.5
-11.4
34.2
0.2
-0.1
0
1.8
1.2
-34.5
-1.1
-34.5
0
34.3
11.3
11.8
0
-11.5
4.7
0
0
0
0
0
0
0
0
0
0
-1.5
0.1
0.1
23.6
0
0
0
0.7
0.1
11.8
-11.5
0
-0.4
0
-0.4
-0.4
0
11.8
0
0
-11.5
0
4.6
0
0
11.9
0
0
-0.1
-0.1
0
0
0
0
0
0
0
0
0
11.3
-11.4
0
0
0
0
0
11.8
0
0
0
0
0
0
0
0
0
IC1~5: µPC4570HA
Dual OP-Amp
Vcc Vo1 -Vm1 +Vm1 VEE +Vm2 -Vm2 Vo2 Vcc
1
2
3
4
5
6
7
8
9
+
+
-
-
1
2
IC8, 9, 11, 12 : LM1875T
Power Amp
+IN
–IN
–VEE
OUTPUT
+
VCC
1
2
3
4
5
–
8
7
6
5
4
3
2
1
OUT1
–Vcc
+IN2
–IN2
OUT2
+Vcc
–IN1
+IN1
IC10: M5218AL
Headphone Amp.
IC13: STK404-050
AF Power Amp
1
3
2
4
5
6
7
8
9
10
R1
R4
R5
C1
C2
D1
TR3
TR5
R3 R6
TR4
SUB
R2
TR1
TR2
TR6
TR7
TR8