Schematic Diagram - Yamaha YST-SW005 Service Manual

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B

SCHEMATIC DIAGRAM

MAIN (2)
1
2
3
4
MAIN (3)
0
0
5
R, T, K models
6
J, U, C, A, B, G models
BE
YE
7
MAIN (4)
BE
WH
8
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
2SC1815
2SD2531
2SC4688
2SK304
RBV-402
2SA1015
2SB1642
2SC2240
S
E
B C
G D
B C
C B
9
E
+
E
C
D
E
MAIN (1)
14.3
0
0
0
-14.3
0
0
0
14.3
0
0
0
0
-14.3
33.2
14.3
14.8
-14.8
-14.3
-33.2
POWER SUPPLY
13.4
13.4
MAIN (5)
13.4
RE
RE
0
YE
YE
0
S1NB20
1N4148
NJM4558D
STK404-050AF
MTZ15C
KIA555P
MTZJ24B
+
Anode
MTZJ12C
~
10
8
4
~
Cathode
1
1
F
G
LIMITTER
13.2
0
0
0
0
0
0
0
0
0
0
-13.2
PROTECTION
0
0
0.8
AUTO POWER ON/OFF CIRCUIT
7.9
3.9
3.9
0
3.9
3.9
3.9
7.9
13.4
7.9
0
0.1
0.6
0
IC1, 4, 7, 10 : NJM4558D
OP Amp.
OUT1
1
8
+Vcc
µPC1237HA
NJM78L08A
–IN1
2
7
OUT2
+
+
+IN1
3
6
–IN2
–Vcc
4
5
+IN2
8
OUT
IN
1
COM
H
I
POWER AMP.
0
-1.5
0
13.2
0
0.5
0
0
-13.2
0
3.9
0
IC5 : KIA555P
IC9 : NJM78L08AV
Protect
Voltage Regulator
R
R
R
V
IN
+
FLIP-
FLOP
V
OUT
1
8
2
3
4
5
6
7
GND
J
K
L
YST-SW005
WH
RE
IC2 : STK404-050AF
AF Power Amp.
TR7
TR6
R1
R4
TR1
TR2
R5
TR8
C2
C1
R2
TR5
D1
TR3
R3
R6
TR4
SUB
1
2
3
4
5
6
7
8
9
10
MAIN (6)
IC3 : µPC1237HA
Protect
Vcc
7
8
Relay
Overload
Vcc on
1
drive
6
detect
mute
circuit
Flip flop
circuit
Mid-point
AC OFF
2
potential
detect
detect
Latch / automatic
return select
5
3
4
GND
All voltage are measured with a 10MΩ/V DC electric 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.
s
8

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