■
SERVICE PRECAUTIONS
（サービス時の注意）
Safety measures
• Some component parts on the PSANH circuit board
maintain a high voltage even when the power is switched
off. For this reason to avoid an electrical shock, do not
touch the upper metallic part of the following capacitors
until the remaining voltage has discharged.
安全対策
・ PSANH シートの部品の一部には電源 OFF 状態でも高
電圧が残ります。感電防止のため、残った電圧を放電
するまで下記のコンデンサの上部の金属部分に触らな
いでください。
［放電方法］
修理作業を始める前に、放電抵抗（220 Ω、10W）を
下図に示す放電用の端子間に接続します。（7 箇所）
放電に必要な時間は約 10 秒です。放電完了確認のため、
端子間電圧がほぼ 0（ゼロ）V であることをテスターで
チェックします。
注意：
C205 の放電完了まで IC201 とそれを固定しているヒー
トシンクには触らないでください。
[Discharging Method]
Before starting the service work, connect discharging
resistors (220 Ω 10W) to the terminals indicated in the
figure below to discharge electricity. (7 points)
The required discharging time is about 10 seconds.
Check that the DC voltage between the terminals
measures close to 0 (zero) volts using a multi-meter to
make sure that the discharge is completed.
Note:
Do not touch the IC201 and its heat sink before
discharging the C205.
PSANH circuit board
Capacitors /
コンデンサ
Discharging point /
放電箇所
C316, C317, C322, C323
①
D305: + pin <=> D305: - pin
C318, C319, C324, C325
②
D306: + pin <=> D306: - pin
C344, C354
③
CN305 <=> CN316
C345, C355
④
CN307 <=> CN316
C347, C356
⑤
CN308 <=> CN309
C348, C357
⑥
CN310 <=> CN309
C205
⑦
R213: lead <=> C201
C323 C322
REAR
FRONT
C317 C316
C324 C318
C325
C205
C201
R213
C344 C354
C345 C355
C357
C356
C348
C347
C319
D305
220 ohms/
10W
220 ohms/
10W
220 ohms/10W
220 ohms/10W
220 ohms/10W
220 ohms/10W
220 ohms/10W
D306
1
3
4
2
CN316
CN307 CN305 CN308
CN310
CN309
6
7
5
NXAMP4x4
5
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