Yamaha A-S2100 Service Manual page 66

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