Yamaha AV-S77 Service Manual page 38

A B
AV-S77
NX-SW77 SCHEMATIC DIAGRAM (AMP)
1
2
0
-11.4
0
3
4
0
-11.4
0
0
0
0
5
11.8
0
0
0
-11.5
6
7
8
9
45
C D E
11.8
0 0 0
0
-11.6
0
0
0 -11.4
0
0 -11.4
0 0
0
0
0
MUTING
0 0
0
0
0
0
0 -11.4
0
-11.6
0
0 -11.4
0
0 0
11.8
0
LFE (SW)
11.8
0
0 0
0
0
0
-11.4
0
-11.4
0
F G
24.7 0.1
REAR L
24.8
s
0
4.5
-25.0
0
4.5 0.1
0 0.7
0
0
0
DC SIGNAL DETECT REAR
SPEAKER
RELAY
24.8
0
-25.0
POWER AMP
MAIN L
24.7 0.1
(FRONT L)
24.8
s
0
-25.0 4.5
0
4.5 0.1
0.7
0
0
0
0
DC SIGNAL DETECT FRONT
SPEAKER
24.8 RELAY
0
-25.0
23.6 0.1
34.2 11.3
POWER
1.8
AMP
11.3
SUBWOOFER RELAY
11.9
1.2
0.2
34.3
s
0.1
0
-34.5
0 -0.1
-1.1
0
-34.5
0
CURRENT
DETECTOR
0
11.8
0
0
0 0 0
0
11.8
-0.1
0
0
0 -11.5
0 -0.1
0 0 0 0 0 0 0
-11.5
0
-11.5
4.7
4.6 0
0
-0.4
0 -0.4
0
0
0 -0.4
PROTECTION
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
2SA1015 2SC1740S 2SK304 1SS133
2SC1815 MTZ12B
2SC2878
E S
C B G D
E Cathode
C B
H I
BLACK
SYSTEM
CONNECTOR
0.7
0
-1.5
0
0.1
11.8
WHITE
SYSTEM
0
CONNECTOR
0
0
0
LM1875T M5218AL µPC4570HA STK404-050
Anode
9
8
10
1
5 1
1 1
J K L
IC1~5: µPC4570HA
Dual OP-Amp
SPEAKERS
C
1 2
- + + -
1 2 3 4 5 6 7 8 9
Vcc Vo -Vm +Vm V +Vm -Vm Vo Vcc
1 1 1 EE 2 2 2
IC8, 9, 11, 12 : LM1875T
Power Amp
+
–
1 2 3 4 5
IC10: M5218AL
Headphone Amp.
1 2 3 4 5 6 7 8
PHONES
IC13: STK404-050
AF Power Amp
TR7
TR6
R1
R4
TR1 TR2
R5
TR8
C2
C1
R2
TR5
D1
R3 R6
TR3 TR4
SUB
1 2 3 4 5 6 7 8 9 10
SYSTEM
CONNECTOR
A
SYSTEM
CONNECTOR
B
# 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.