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Yamaha A-S2100 Service Manual page 66

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A
B
A-S2100
1
MAIN (3)
(Side A)
2
3
POWER TRANSFORMER
4
POWER TRANSFORMER
5 k-ohms
10 W
5
• Semiconductor Location
Ref no. Location
D301
D3
5 k-ohms
D302
D4
10 W
D303
D3
D304
D3
D305
H5
D306
D5
D307
D4
D308
D4
6
D311
D2
D312
D2
D313
D2
D314
D2
Ref no. Location
Ref no. Location
D315
D4
D323
H2
D333
D316
D4
D324
G4
D334
D317
D4
D325
G4
D335
D318
D4
D326
H4
IC301
D319
F2
D327
H4
IC302
D320
G2
D330
G4
IC303
D321
H2
D331
H4
IC304
7
D322
H2
D332
G2
Q304
66
C
D
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.
C309, C310, C317–C320, C327, C328 on MAIN (3) P.C.B.
MAIN (1)
(CB102)
BE
W301C
BL
W301D
CB304
GY
W301B
CB302
BR
W301A
W313
MAIN (1)
PSVA1
(CB101)
PSVA2
MG
+5S
PRV
H2
+CCPS
H3
AGND
H4
-CCPS
F3
D4
INPUT (2)
(CB32)
F4
F4
F2
E
F
G
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-ohms
5 k-ohms
10 W
10 W
5 k-ohms
5 k-ohms
10 W
10 W
H
I
(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(3)P.C.B. の C309、C310、C317 C320、C327、C328
MAIN (2)
(CB202)
BL
W307D
BE
W307C
CB303
BR
W307A
CB301
GY
W307B
POWER TRANSFORMER
HPGND
HPGND
HPGND
+PB
PBGND
PBGND
-PB
MAIN (2)
(CB201)
J
POWER TRANSFORMER
5 k-ohms
10 W
MAIN (2)
(CB205)
5 k-ohms
10 W

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