Yamaha A-S3000 Service Manual page 54

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A
B
A-S3000
1
MAIN (1)
(Side A)
2
3
4
PRDR
PRIR
HPPRDR
THMR
MG
+5M
5
FUNCTION (1)
(CB502)
• Semiconductor Location
Ref no. Location
Ref no. Location
Ref no. Location
6
D103
E3
D124
D3
Q108
D104
C4
D130
G4
Q109
D109
G4
D133
G3
Q112
D110
H3
D134
G3
Q113
D112
H3
D135
H3
Q119
D136
H3
Q120
D113
H3
D114
H3
IC102
E2
Q123
D116
H3
Q101
D3
Q124
D117
I3
Q102
D3
Q125
D118
I3
Q104
C4
Q127
7
D119
H3
Q106
C4
Q128
D120
G3
Q107
D3
Q129
54
C
D
CB101
G
D
S
FUNCTION (2)
(W714)
Q113
#
Ref no. Location
D3
Q130
H2
Note) Those parts marked with "#" are not included in the P.C.B. assembly. / マーク#の部品は、 P.C.B. Ass'yに含まれません
D4
Q131
H2
H3
Q133
H4
D5
Q134
H4
G5
Q135
H2
H3
Q136
H3
H4
Q137
H3
C5
Q138
H3
C4
Q139
I3
H3
Q148
C3
H3
Q149
D3
D3
E
F
G
MAIN (3)
(CB304)
for SERVICE
CB103
W101
GR
BL
BR
WH
+B2
-B2
+B1
-B1
E C B
MAIN (3)
(+B1, -B1, +B2, -B2)
Q103
#
Safety measures
Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such
as wearing insulating gloves.
Note that the capacitors indicated below are dangerous even after the power is turned off because an electric charge remains and a
high voltage continues to exist there. Before starting any repair work, connect a discharging resistor (5 k-ohms/10 W) to the terminals
of each capacitor indicated below to discharge electricity. The time required for discharging is about 30 seconds per each.
±B1, ±B2 on MAIN (1) P.C.B.
安全対策
・ この製品の内部には高電圧部分があり危険です。修理の際は、絶縁性の手袋を使用するなどの安全対策を行ってください。
・ 下記のコンデンサには電源を OFF にした後も電荷が残り、高電圧が維持されており危険です。修理作業前に放電用抵抗
(5 k Ω /10 W)を下記の各コンデンサの端子間に接続して放電してください。放電所用時間は各々約 30 秒間です。
MAIN(1)P.C.B. の± B1、± B2
H
I
W104
G
D
S
MAIN (2)
(CB206)
Q119
#
J

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