Internal View; Safety Measures; Service Precautions / サービス時の注意事項 - Yamaha A-S500 Service Manual

■ INTERNAL VIEW

Top view
1 2 3
13
Front view
14 15 16
22
■ 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 (5k-ohms/10W) 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-S500
4 5
12 11 10
17 18 19
21
A-S300
6 7 8 1 OPERATION (1) P.C.B.
2 MAIN (6) P.C.B.
3 MAIN (5) P.C.B. (J model)
4 OPERATION (7) P.C.B. (R model)
5 MAIN (2) P.C.B.
6 DOCK P.C.B.
7 FUNCTION (2) P.C.B.
8 FUNCTION (3) P.C.B.
9 FUNCTION (1) P.C.B.
10 MAIN (4) P.C.B.
11 MAIN (1) P.C.B.
12 MAIN (3) P.C.B.
13 POWER TRANSFORMER
14 OPERATION (11) P.C.B.
15 OPERATION (8) P.C.B.
16 OPERATION (6) P.C.B.
17 OPERATION (3) P.C.B.
18 OPERATION (4) P.C.B.
19 OPERATION (5) P.C.B.
20 OPERATION (9) P.C.B.
9
21 OPERATION (2) P.C.B.
22 OPERATION (10) P.C.B.
20
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-S500/A-S300
11