Schematic Diagram - Yamaha YST-SW030 Service Manual

A B

SCHEMATIC DIAGRAM

YST-SW030
1
L.P.F.
MAIN (3)
3
INPUT
2
0
4
0
0
5 -14.3
2
VOLUME
7
0
0
6 8
0
9 14.3
3
4
MAIN (9) MAIN (10)
s9
5
L=160
6
7
L, R, T, K models
8 PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
2SA970 2SB1642 2SK304 RBV-402
2SAKTA1266 2SD2531
2SC2240
2SCKTC3198
E S
B C
C B G D +
E
9
C D E
L.P.F. H.P.F.
4
2 6
0
3 0 8
0
0 7 0
0
9 14.3 5 -14.4
-1.8
0
MAIN (6) MAIN (7) MAIN (6)
s9
MAIN (2) MAIN (2)
WH
L=180
BE
L=180
s9
1SR139-400 µPC4570HA
STK404-120 TA7317P
1SS133
1SS176
MTZJ15.0C
Anode
MTZJ24.0B
9 9
12
–
Cathode
1 1
1
F G
MAIN (1)
LIMITER
14.6
0 0 0
0 0.1
0
0
0
0
0
0.1
0 0 0
-14.6
24.7 1.1
PROTECTION
-37.3
REGULATOR
0
38.6 14.5
AC 61.5
15.0
15.0
0
0
0
-41.6 41.5
-15.0
-15.0
0
-38.9 -14.5
POWER SUPPLY
MAIN (4)
IC1: STK404-120
Power Amp.
1
# 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.
H I
POWER AMP.
41.4
41.4
0
0
A.N.I.C.
0
-1.9
0 -0.2
0
7
8
0 3
6
-0.2 0 0 2 -0.3
0 4 0
5 -14.5 0
1 14.5
WC05070
TR7
R1
TR6
R4
TR1 TR1
R5
TR8
C2
R2
C1
TR5
TR3 TR4 D1
R3 R6
PT1
SUB
2 3 4 5 6 7 8 9 10 11 12
★ 電圧は、内部抵抗10MΩの電圧計で測定したものです。
★ s 印のある部品は、安全性確保部品を示しています。部品の交換が必要な場合、パーツリス
トに記載されている部品を使用してください。
★ 本回路図は標準回路図です。改良のため予告なく変更することがございます。
J K L
YST-SW030/YST-SW010
41.5
-0.7
DRIVER
IC2, 4, 5: µPC4570HA
Dual OP-Amp
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
IC3 : TA7317P
Protector
8 9
Muting Constant voltage
circuit power supply circuit
Power supply
ON/OFF
detecting circuit
1
Schmidt Relay drive
Overcurrent OR circuit 6
circuit circuit
detecting circuit
Discharging
2
±Current voltage Substrate
circuit
detecting circuit
3
7 4 5
GND
13