Schematic Diagram - Yamaha YST-SW225 Service Manual
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Also See for YST-SW225:
- Owner's manual (20 pages) ,
- Product catalog (44 pages) ,
- Owner's manual (121 pages)
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A
B
SCHEMATIC DIAGRAM
1
0
0
0
14.7
2
0
0
0
-14.7
PHASE
3
0
0
0
14.7
0
0
0
-14.7
4
VOLTAGE
SELECTOR
5
6
7
IC1, 3, 4: NJM4558L
Dual OP-Amp
1
2
3
4
5
6
7
8
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
8
2SA1015
2SA1837
2SC4688
2SC1846
2SA1145
2SB1340
2SA970
2SB1642
2SC1815
2SC4793
2SC2240
2SD1889
2SC2705
2SD2531
2SC2878
E
B C
B
E C
C B
C E
E
B
9
C
D
E
L.P.F.
VOLUME
HIGH CUT
14.7
0
0
0
ON
HIGH CUT
PASS
FILTER
H.P.F.
H.P.F.
-14.7
0
-14.7
0
14.7
0.068
0.068
0
0
0
0
0
0
0
B.A.S.S.
STANDBY/ON
1.4
1.4
1.3
1.3
1.3
3.3
1.3
1.3
AC74.0
AUTO POWER ON/OFF CIRCUIT
The voltages are measured with Auto Standby OFF.
オートスタンバイOFFで測定
AUTO
STANDBY
REGULATOR
POWER
SUB
POWER SUPPLY
5.9
AC12.1
0
12.6
5.7
1SR139
S1NB20
D3SBA20
NJM78L08A
LB8555D
1SS133
EL02ZLF
MTZJ12C
Anode
+
MTZJ15C
–
MTZJ5.6B
MTZJ24B
~
8
–
OUT
1
~
+
Cathode
IN
COM
F
G
LIMITER
14.7
0
0
0.1
0.1
0
0.1
0
0
150
0
0.1
0
0
0.1
0.1
0.1
-14.6
-49.4
A.N.I.C.
14.7
-49.4
-14.7
0
0
0
0
0
0
3.0
1.4
-3.6
2.5
-1.9
2.0
1.3
-3.1
1.3
-3.7
8.0
6.6
5.9
150
0.1
6.7
8.0
6.4
6.8
0
4.0
4.0
1.4
0
0
8.0
12.5
0
12.5
REGULATOR
0.1
0.1
0.7
IC2, 5, 6: µPC4570HA
0
Dual OP-Amp
Vcc Vo
µPC4570HA
NJM4558L
# All voltages are measured with a 10MΩ/V DC electronic volt meter.
9
8
# Components having special characteristics are marked s and must be replaced
4
with parts having specifications equal to those originally installed.
# Schematic diagram is subject to change without notice.
1
1
H
I
50.1
49.5
49.6
49.6
49.0
49.0
49.0
0.1
5.7
0.7
0.7
0.7
0.8
0.1
0.8
5.7
-49.4
-0.4
0
-1.0
PRE DRIVE
-1.0
0
-49.4
-5.7
-49.4
-50.0
-0.8
-49.4
-5.7
-50.1
-50.1
-5.2
PS AMP
REGULATOR
44.4
14.7
15.2
0
0.1
0
-15.2
-14.7
-44.5
0
-50.2
50.1
0
POWER SUPPLY
IC7: LB8555D
Timer
VCC
8
7
DISCHARGE
THRESHOLD
6
CONTROL VOLTAGE
5
R
1
2
S
Q
-
+
+
-
TRIGGER
2
3
OUTPUT
1
2
3
4
5
6
7
8
9
-Vm
+Vm
V
+Vm
-Vm
Vo
Vcc
1
1
1
EE
2
2
2
RESET
4
1
GND
★ 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-SW225
50.1
PS AMP
50.1
50.0
50.0
50.0
PS
5.3
4.8
AMP
4.8
0
4.8
POWER
50.0
DRIVE
50.1
0
50.1
0
DRIVER
-3.6
0
POWER
0
DRIVE
-4.7
0
-4.7
-4.7
-50.1
-50.1
-50.1
-50.0
PS AMP
-50.0
23.9
0.8
1.3
1.3
1.3
1.3
0.1
0.7
0
0
0
0.7
0
0
PROTECTION
0
-22.6
IC8: NJM78L08A
Voltage Regulator
V
IN
V
OUT
GND
13
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