Schematic Diagram - Yamaha YST-SW215 Service Manual

A B

SCHEMATIC DIAGRAM

1
Q Q
3 7 6 3 1 5 1 5 0
10.7
0
0
0
14.8
14.0
L.P.F.
2
0
0
0
-14.6
3
4
H.P.F
T E
L 1 3 9 4 2 2 9 6 5 1 3
-14.6
0
0
0
5
6
7
w w w
8
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
.
2SA1015 2SB1642 2SC4688 2SK304 1SR139
2SA970 1SS133
MTZJ12C
2SC1815
2SC2240 MTZJ15C
2SC2878 MTZJ24B
E B S
B C
C B C E G D
E
9
C D E
B.P.F L.P.F
-14.6
0
0
0
10.7
10.0
0.1 10.7
0
0
0.7
0.1
0
0
0.1
-0.1
14.8
0.1
6.8
8.0 4.9
0
6.7
3.9
1.4
0
3.9
0
AUTO POWER ON / OFF CIRCUIT
0 0.1
0.1
1.9
0
0.7
0
0
L.P.F
0
14.8
0
0
0
-22.7
AC 73.9
0
0
-5.2
0
POWER SUPPLY
6.2
AC 12.5
0
6.1
SUB POWER SUPPLY
x a o
y
i
S1NB20 D3SBA20 NJM78L08A LB8555D NJM4558L
+
Anode
–
~
8 4
–
OUT
1
~ +
Cathode
IN
COM
F G
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8
LIMITER
14.9
0 0 0
0
0
0.1 0
0
0
0.1 0
0
0
0
0 0
-14.8
PROTECTION
24.2 1.1
Q Q
3 7 6 3
6.0
6.6
0.7
0.2
0
0.6
-0.3
-0.3
REGULATOR
41.9 14.8
15.3
15.3
0
0
50.1
-15.1
-15.1
-42.6 -14.6
REGULATOR 13.2 8.0
0
13.3
0.1
0.7
0
u 1 6 3
.
mPC4570HA TA7317P STK404-120
9 9
8
12
1 1 1
1
H I
2 4
9 9 8
POWER AMP PROTECTION
50.1
50.0
50.3
0
-0.3
0
A.N.I.C.
0
0 -0.2 -1.8
0
0
0 0 0
-0.2
0 -0.2
0
-14.6
14.8
1 5 1 5 0 8 9 2 4
m
c o
H All v oltages are measured with a 10M /V DC electric volt meter.
H Components ha ving special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
H Schematic diag ram is subject to change without notice.
J K L
YST-SW215
IC1: STK404-120
Power Amp.
2
9 9
IC2, 4, 7, 10: µPC4570HA
Dual OP-Amp
1 2
- + + -
1 2 3 4 5 6 7 8 9
Vcc Vo 1 -Vm 1 +Vm 1 V EE +Vm 2 -Vm 2 Vo 2 Vcc
IC3 : TA7317P
Protector
9
8
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
2 Discharging
Substrate
±Current voltage
circuit
3 detecting circuit
7 4 5
GND
IC11: NJM4558L
Dual OP-Amp
9 8 2 9 9
1 2 3 4 5 6 7 8
IC201: LB8555D
Timer
VCC 8 7 DISCHARGE
THRESHOLD 6
CONTROL VOLTAGE 5
R
S Q
TRIGGER 2
3 OUTPUT
RESET 4
1
GND
IC202 NJM78L08A
Voltage Regulator
V
IN
V
OUT
GND
11