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Yamaha YST-SW012 User Manual Page 10

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2
ABCDEFGH I J
1
3
4
5
7
YST-SW012
6
10
■ SCHEMATIC DIAGRAM
★ All voltages are measured with a 10MΩV DC electronic 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.
IC1: STK404-070 60W
AF Power Amp
13245678910
R1
R4
R5
C1
C2
D1
TR3
TR5
R3
R6
TR4
SUB
R2
TR1
TR2
TR6
TR7
TR8
1
10
STK404-070 60W
1
9
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
2SB1642
2SD2531
1SR139,400
1SS133,176
MTZJ15C
MTZJ24B
MTZJ5.6B
2SA970
2SC2240
2SC2878
µPC4570HA-A
Anode
Cathode
E
C
B
B
C
E
RBV-402
IC4~6: µPC4570HA-A
Dual OP-Amp
Vcc Vo
1
-Vm
1
+Vm
1
V
EE
+Vm
2
-Vm
2
Vo
2
Vcc
1234 567 89
++--
12
+
–
-35.2
AC 52.0
0.2
0.2
0.2
0.2
0.2
0
0
0
0
0
0
0.2
0.2
35.0
35.0
35.1
-8.1
0
0
0
0
14.5
-14.5
0
0
0
0
0
15.0
29.4
29.4
-30.7
35.0
14.5
-15.1
-14.5
-29.5-29.6
0
0
23.6
1.3
0.1
-8.0
1.3
1.3
1.3
0
0.7
0.7 0.8
0
0
0.2
0.2
0.2
-34.9
-35.2
35.1
0
0
1.1
-1.1
1.7
14.5
0
0
0
-1.9
0
14.5
14.5
-14.6
-14.6
0
0
0
0
0
0
0
0
0
L.P.F.
L.P.F.
DRIVER
R, T, K, L models
MAIN (1)
MAIN (3)
MAIN (10)
MAIN (7)
MAIN (5)
MAIN (2)
MAIN (9)
VOLUME
H.P.F.
POWER AMP
A.N.I.C
LIMITER
PROTECTION
POWER
SUPPLY
REGULATOR
POWER
INPUT
U, C, A, B, G models
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