Yamaha YST-SW225, Service Manual

Page: 13 / 23

A B C D E F G H I J K L
YST-SW225
13
SCHEMATIC DIAGRAM
1
2
3
4
5
6
7
8
9
★
All voltages are measured with a 10M
Ω
/V 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.
★ 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。
IC2, 5, 6:
µ
PC4570HA
Dual OP-Amp
Vcc Vo
1
-Vm
1
+Vm
1
V
EE
+Vm
2
-Vm
2
Vo
2
Vcc
1 2 3 4 5 6 7 8 9
+ + - -
1 2
8 7 6 5 4 3 2 1
OUT
1
–Vcc
+IN
2
–IN
2
OUT
2
+Vcc
+IN
1
–IN
1
IC1, 3, 4: NJM4558L
Dual OP-Amp
IC7: LB8555D
Timer
1
VCC 8 DISCHARGE 7
CONTROL VOLTAGE 5
THRESHOLD 6
+
–
TRIGGER
GND
2
RESET 4
+
–
R
S Q
OUTPUT 3
V
IN
V
OUT
GND
IC8: NJM78L08A
Voltage Regulator
1
8
1
9
1
4
8
OUT
COM
IN
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
2SA1837
2SB1340
2SB1642
2SC4793
2SD1889
2SD2531 2SC4688 1SR139
1SS133
EL02ZLF
MTZJ12C
MTZJ15C
MTZJ5.6B
MTZJ24B S1NB20 2SA1015
2SA1145
2SA970
2SC1815
2SC2240
2SC2705
2SC2878 D3SBA20 NJM4558L NJM78L08A
µ
PC4570HA LB8555D
Anode
Cathode
~
+
~
–
+
–
E
C B
B C
E
2SC1846
B
C E
B
E C
0
0
0
0
0
0
0 0
0
14.7
-14.7
0
0
0 0
0
0
0
0
0
0
0
0 0
1.3
1.3
1.3 1.3
1.3
1.3
1.4
2.0
5.9
6.6
-3.7
-3.6
-3.1
-1.9
3.0
0
0
0 0
0
0
-50.1
-50.1
-50.0
-49.4
-49.4
-49.4
-49.4 -49.4
0.1
0.1
0.1
0.1 0 0
0
0
0
0
0.1
0.1
0.1
0.1
0.1
14.7
-14.6
0 0
0.7 0.7
0.7
49.0
49.0 49.0
49.6
49.6
49.5
50.1
-49.4
-1.0
-0.4
-1.0
0
0
0
0
-4.7
-4.7
-4.7 0
-5.2
-50.1 -50.1
-50.1
-50.0
0.1
0.1
23.9
0
1.3 1.3 1.3
0.7
0.7
0.8
1.3
0
0
0
50.1
-50.2
0
0
-22.6
0
0
-50.0
-5.7
0
-3.6
0
5.7
5.7
5.3
4.8
4.8
4.8 0
50.0
50.0
50.0
50.0
50.1
50.1
50.1
50.1
-5.7
-0.8
0.8
0.8
-14.7
14.7
2.5
14.7
-14.7
-44.5
15.2
-15.2
8.0
6.4 6.4 5.4
0
0 0
0
0
0
AC12.1
AC74.0
1.4
8.0
8.0
12.5
12.5
12.6
5.9
5.7
0.1
0.1
0.7
4.0
4.0
0.1
6.7
6.8
6.4
0
1.5 6.6 8.0
44.4
0
0
8.0
1.3
1.4 1.4
3.3
-14.7 -14.7
14.7
14.7
-14.7
0
0
14.7
PS AMP
PS AMP
PS AMP
PS
AMP
POWER
DRIVE
PROTECTION
AUTO POWER ON/OFF CIRCUIT
REGULATOR
REGULATOR
REGULATOR
SUB
POWER SUPPLY
POWER SUPPLY
POWER
DRIVE
L.P.F.
H.P.F. H.P.F.
LIMITER
PRE DRIVE
A.N.I.C.
INPUT2
OUTPUT
INPUT1
PHASE
B.A.S.S.
HIGH CUT
FILTER
HIGH CUT VOLUME
STANDBY/ON
AUTO
STANDBY
POWER
VOLTAGE
SELECTOR
DRIVER
PASS
ON
0.068 0.068
0.022
150
0.01 C79
150
470K R150
B1340
B1340
D1889
D1889
オートスタンバイOFFで測定
The voltages are measured with Auto Standby OFF.