Yamaha YST-SW205, Service Manual

Page: 17 / 32

A
1
2
3
4
5
6
7
8
9
B C D E F G H I J K L
YST-SW205/SW305
SCHEMATIC DIAGRAM (YST-SW205)
E-16/J-12
INPUT 1
µ PC4570HA
1
9
M51848L
µ PC1237HA
1
8
NJM79M12FA
1: COM
2: IN
3: OUT
NJM78M12FA
1: OUT
2: COM
3: IN
NJM78L08A
OUT
COM
IN
x: NOT USED
O: USED / APPLICABLE
NJM4558L
2SA970
2SA1015
2SA1145
2SC1815
2SC2240
2SC2705
2SC2878
E C
B
2SK304
E C
B
PIN CONNECTION DIAGRAM OF TRANSISTORS,
DIODES AND ICS.
B C E
2SA1837
2SC4793
2SC1846 2SC4688
2SA1695
2SC4468
1SR139
1SS133
MTZJ3.6B
MTZJ12.0C
MTZJ24.0B
S2L20U
D3SBA20 S1NB20
Anode
Cathode
IC1, 4, 7~9 : µPC4570HA
Dual OP-Amp
IC6: NJM78M12FA
Voltage Regulator
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
INPUT
OUTPUT
COMMON
IC10: NJM79M12FA
Voltage Regulator
IC11: NJM4558L
Dual OP-Amp
IC12: NJM78L08A
Voltage Regulator
COMMON
OUTPUT
INPUT
8 7 6 5 4 3 2 1
OUT
1
–Vcc
+IN
2
–IN
2
OUT
2
+Vcc
+IN
1
–IN
1
V
IN
V
OUT
GND
–
+
~
~
~
+
~
–
1
8
B C
E
E C B
L.P.F.
L.P.F.
B.P.F.
L.P.F. H.P.F.
PRE DRIVE
LIMITER
POWER SUPPLY
A.N.I.C
PS AMP POWER DRIVE
POWER SUPPLY
PROTECTION
AUTO POWER ON/OFF CIRCUIT
SUB POWER SUPPLY
★ 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.
IC5 : M51848L
CR Timer
IC3 : µPC1237HA
Protector
1
2
5 3 4
7
8
6
Overload
detect
Mid-point
potential
detect
Flip flop
circuit
Vcc on
mute
AC OFF
detect
Latch / automatic
return select
Relay
drive
circuit
GND
Vcc
GND
6
4
1
2 3
TRIGGER
OUT
RESET
REFERENCE
VOL
TA
GE
THRESHOLD
DISCHARGE
VCC
7
8
+
–
FLIP-
FLOP
+
–
5
R R R
100
C91
0.01
SG
82K
B220
100/16
0
11.8
8.6
8.0
8.6
0
0
11.8
-11.9
0
0
0
0
0
0
0
0
-11.8
0.7
0
0
0
0
-11.9
0 1.9
0.1
0.6
0
0.1
0
0
0
11.8
0
0
0
7.9
7.3
-11.9
0 0
0 0 0 0
0.1
0.6
-65.7
0.1
-65.7
-66.6
-65.5
-64.9
-65.5
-66.7
1.8
65.1
0.6
65.6
66.1
65.1
65.1
-1.6
-4.2
-4.2
-1.0
-1.0
1.2
1.2
1.8
65.1
65.5
4.4
-3.6
-66.7
66.1
-66.7
0
0
AC
97.7
4.4
66.1
66.1
3.3
-1.6
-64.9
-65.7
-65.7
-65.7
0.6
-65.7
-66.6
-65.7
0.1 -0.1
11.8
0
0
0
0
0
0
0
0
11.8
0
0
-11.9
11.8
-11.9
18.7
-18.7
0
0
18.7
-18.7
0
0
0
0
0 0
-11.8
0
0
0.3
0
11.8
0
0
0
-1.5
0.7
3.9
3.9
0
7.9
6.7
6.6
0
0
5.2
0
1.4
0
11.8
0.2
11.9
0
7.9
5.7
5.7
0
12.0
0.2
AC
28.9
AC
12.0
6.6
6.4 6.4 5.3 7.9 6.6 1.4 0 7.9
0.7 0 3.3 2.0 0 0.1 0
6.0
25.1 0.8
6.6
2.1
0
-2.7
-2.7
-2.7
-66.7
-66.0
-66.7
-66.7
-2.7
-66.7
-66.7
66.1
65.9
65.7
65.9
2.7
66.1
0.6
0.1
-2.7
-2.7
3.3
0
66.1
66.1
66.1
3.3
1.8
-1.6
-1.0
1.2
-1.0
0.6
-0.5
-0.5
-3.3
-3.6
0.1
66.1
66.0
0.1
66.0
0
2.7
0.1
-66.7
66.1
66.1
66.1
65.5
2.7
2.7
65.5
2.7
2.7
-66.7
-66.3
-66.7
-69.7
-11.9
0
0
0
IDLING CURRENT ADJ.
DC 30 mV to 200 mV
B
A
w w w . x i a o y u 1 6 3 . c o m
Q Q
3 7 6 3 1 5 1 5 0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299
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