Yamaha YST-SW205 Service Manual page 18

A B
YST-SW205/305
SCHEMATIC DIAGRAM (YST-SW305)
1
Q Q
3 7 6 3 1 5 1 5 0
11.9
11.9
0
0
0
0
L.P.F.
2
0
0
0
-12.0
3
H.P.F. L.P.F.
11.9
4
-12.0
0
0 0
0 0
0
T E
L 1 3 9 4 2 2 9 6 5 1 3
5
6
7
w w w
8
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
2SA970
2SA1015
2SA1145
2SC1815
2SC2240
2SC2705
2SC2878
9
E-17/J-13
C D E
B.P.F. L.P.F.
0 -12.0
8.7 0
0
8.0
8.6
0
0
0
0
0.7
0
0
0 LIMITER
11.9
0
0 0 0 0
0 0
-12.0 11.9
-0.1 0.1
0 0
0 0
0 0
0.1
0.1
0 1.9
0.7
0
100
7.5
8.1
C91
0.01
SG
A.N.I.C
11.9
0 0
0
-0.3
0 0
0
0
-12.0 0
-12.0
POWER SUPPLY
0
18.2 11.9
0
-18.3
18.3
0
AC
28.3
0
-18.2 -12.0
SUB POWER SUPPLY
5.6
0
11.8
5.6
AC
11.8
x a o
. i
2SK304 2SA1837 2SC4688 2SC1846 1SR139 D5SBA20
2SC4793 2SA1695 1SS133
2SC4468 MTZJ3.6B
MTZJ12.0C
MTZJ24.0B
S2L20U Anode
E ~
B C E C
E C B B
C B E C E Cathode
B +
F G
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PRE DRIVE
69.4
69.5
68.9 4.4
68.8 4.4 3.8
68.9 69.5
68.3
68.3 68.3
0.6 1.7 1.7
1.1
1.1
IDLING CURRENT ADJ.
0.6 0.6
0.1
0.1
-68.5 -68.5
-1.1
-68.5
-1.7 -1.7
-68.5 -68.5 -68.3
-69.7
-68.5 -68.5 -68.3
-69.6
-3.7
-69.1
-69.6
-4.3
-69.1
-69.7
AC
103.2
POWER SUPPLY
0
-69.6
69.4
D5SBA20
0
Q Q
0
3 7
-1.5
0
11.9
0 0
0
0
11.7 8.1
AUTO POWER ON/OFF CIRCUIT
8.1
11.7
0
6.9
0.2 4.1
6.8
0.2
4.1
0.7
0
u 1 6 3
y
S1NB20 NJM78L08A NJM78M12FA NJM79M12FA M51848L µPC4570HA
µPC1237HA
+
–
8
– ~ OUT
3: IN 3: OUT
IN
~ 1: OUT 1: COM
COM
2: COM 2: IN
~
1 1
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H I
2 4
8 9
1.7
1.1
POWER DRIVE PS AMP
-1.7
69.4
69.4
69.4
69.3 68.7
69.4
68.7
69.3 69.9
68.7
2.7 69.4
68.7
2.7
2.7
3.8
3.3
2.7 0
69.4
2.7
1.1
2.7 0
2.7
0.6 A
69.4
0.6
0
69.4
69.3 0
0
0
DC 30 mV to 200 mV
0
-0.6
-0.6
-2.6
-2.6
0
-1.1 -2.6
-69.7
0
-2.6
-3.3 -3.3
-68.9
-2.6
-2.7
-69.4
-69.6
-68.9 -69.1
-69.0 -69.4
-69.3
-69.5 -69.6
3.3 2.2 0.7 0 2.1 0 0 0
PROTECTION
6.3
24.8 0.8
6.8
6 3 1 5 1 5 0 8
0 1.4 6.8 8.1 5.4 7.1 7.1 8.1
6.6
1.4 0
0
0 6.6
m
x: NOT USED
O: USED / APPLICABLE
c o
.
NJM4558L
9
8
1
J K
IC1, 4, 7~9 : µPC4570HA 2
9 8 9 9
Dual OP-Amp
1 2
- + + -
1 2 3 4 5 6 7 8 9
Vcc Vo -Vm +Vm V +Vm -Vm Vo Vcc
1 1 1 EE 2 2 2
IC3 : µPC1237HA
Protector
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
IC5 : M51848L
CR Timer
B
R R R
–
+
FLIP-
FLOP
1
2 3 4 5 6 7 8
IC6: NJM78M12FA
Voltage Regulator
INPUT
OUTPUT
COMMON
9 2 4 9 8 2 9 9
IC10: NJM79M12FA
Voltage Regulator
COMMON
OUTPUT
INPUT
IC11: NJM4558L
Dual OP-Amp
1 2 3 4 5 6 7 8
IC12: NJM78L08A
Voltage Regulator
V
IN
V
OUT
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.
L