Yamaha FSW150 - YST Subwoofer - 75 Watt, Service Manual

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JK1
IC1
IC1
W2
W1
W3B
W3A
CB3
CB2
CB1
IC6
IC6
IC4
IC2
IC2
IC3
CB4
W8
W9
W10A3
W10A2
W10A1
CB8
CB9
IC5
CB6
CB5
W6A
W10B3
W10B2
W10B1
W10B3
W6A
W6B
W14B
W13B
W12B
W7B
W11B
W14A
W13A
CB11
CB12
W12A
W11A
W7A
W10B2
W10B1
W7A
CB7
W6B
W7B
A
1
2
3
4
5
6
7
8
9
10
B C D E F G H I J K L M N
YST-FSW150/YST-FSW050
16
★
All voltages are measured with a 10M
Ω
/V DC electronic voltmeter.
★
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.
MAIN
YST-FSW050
AC 51.2V
0
0
+15.0
0
0
0
-15.1
0
0
0
0
+15.0
0
0
0
-15.1
0
0
+15.0
0
0
-15.1
0
0
+12.6
-15.1
-29.6
+15.0
+29.3 +34.8
-34.9 -34.9
0
0
0
0
0
0 0
0 0
0
+28.9
-34.5
0
-7.1
0 0
+1.3
+1.3
+0.7
+0.7
+0.8
+1.3
+1.3
0
0
0
0
0 0 0
0
0
0 0
0
+15.0
+14.4
+14.4
0
0
+34.7 -34.8
+23.9
0
0
-15.1
0
0
0
+15.1
0
0
0
+34.7
+34.7
+34.7
0
0
+0.2 +0.2
0
+1.8
-34.3
+15.0
+1.2
+1.2
-34.8
+34.7
0 0
V723510
JG-11-T
FG64410
0.01/50
FG65122
22P
s16
s17
L2
J502 O O O
O
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
IC5 : NJM79M15FA
Voltage regulator
COMMON
OUTPUT
INPUT
INPUT
OUTPUT
COMMON
IC4 : NJM78M15FA
Voltage regulator
IC1, 2, 6 : NJM4558L
Dual operational amplifier
8 7 6 5 4 3 2 1
OUT
1
–
Vcc
+IN
2
–
IN
2
OUT
2
+Vcc
+IN
1
–
IN
1
IC3 : STK404-120
Power amplifier
SUB
PT1
TR3
C1
C2 R2
R1
TR1 TR2
TR6
TR7
TR8
TR5
TR4
D1 R3 R6
R5
R4
8 11 12 1 2
5 4 6 7 9 10 3
NJM79M15FA
1: OUT
2: IN
3: COM
NJM78M15FA
1: OUT
2: COM
3: IN
NJM4558L
1
8
STK404-120
1
12
1SR139
Anode
Cathode
1SR400
1SS133
Anode
Cathode
1SS176
D3SBA20 4A 200V
1
2
3
4
MTZJ5.6B
MTZJ12C
MTZJ24B
E
C
B
2SA970 2SA1015-Y
1
2
3
3: Base
2: Collector
1: Emitter
2SC1815
E
C B
E
C B
2SC2240
2SC2878
MAIN (3)
MAIN (4)
MAIN (2)
MAIN (1)
MAIN (7)
MAIN (8)
MAIN (6)
AC IN
POWER
TRANSFORMER
POWER
TRANSFORMER
INPUT
SYSTEM
CONNECTOR
VOLTAGE
SELECTOR
PROTECTION
DRIVER
DRIVER
WOOFER
POWER
SUPPLY
(R, L models) (U, C, T, K, A, B, G, J models)
L.P.F.
H.P.F.
LIMITER
REGULATOR
A.N.IC
POWER AMP.
L.P.F.
3.3K
s17
s16
3.3K
–
+