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Internal View; Service Precautions / サービス時の注意事項 - Yamaha A-S501 Service Manual

Integrated amplifier
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■ INTERNAL VIEW

Top view
1
2
3
4
m
Front view
n
o
t
s
■ SERVICE PRECAUTIONS / サービス時の注意事項
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.
C134, C135 on MAIN (1) P.C.B.
For details, refer to PRINTED CIRCUIT BOARDS:
MAIN (1) P.C.B. .
A-S501
5 6
7
l
k
j
p
q
A-S301
8
9
a MAIN (8)
b MAIN (2)
c FUNCTION (4)
d MAIN (3) (R model)
e DIGITAL
f MAIN (6)
g FUNCTION (1)
h FUNCTION (2)
i FUNCTION (3)
j MAIN (5)
k MAIN (1)
l MAIN (4)
m POWER TRANSFORMER
n OPERATION (7)
o OPERATION (4)
p OPERATION (3)
q OPERATION (1)
r OPERATION (2)
s OPERATION (6)
t OPERATION (5)
r
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 C134、C135
詳しくは PRINTED CIRCUIT BOARDS:MAIN(1)
P.C.B. を参照してください。
A-S501/A-S301
11

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