Yamaha FSW150 - YST Subwoofer - 75 Watt Service Manual page 16

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