Yamaha A-S2000 Service Manual - Page 19

AMP ADJUSTMENT, Idling Adjustment

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I AMP ADJUSTMENT G Idling Adjustment Precaution for handling measuring instrument The ground side of the measuring instrument to be connected to the speaker terminal of this unit must be kept in floating condition because this unit is equipped with the floating balanced power amplifier. Condition • Start adjustment 20 minutes or more after the power is turned on. • Non loaded condition Idling Adjustment Adjust VR201 (Lch)/VR101 (Rch) so that the DC voltage of CB75 (Lch)/CB55 (Rch) becomes +4.0 to +8.0mV. (Fig. 1) DIʣʗ$#ʢ3DI N7 73ʢ-DIʣʗ73ʢ3DI JHʣ mV 10 01 DC voltage / %$ిѹ 10 20 +4.0 to +8.0 mV minute MAIN (2) P.C.B. (Side A) L ch VR201 MAIN (1) P.C.B. (Side A) R ch VR101 MAIN (2) P.C.B. L ch VR201 MAIN (1) P.C.B. R ch VR101 DC +4.0 to +8.0 mV CB75 CB55 Front side Fig. 1 A-S2000 CB75 DC +4.0 to +8.0 mV CB55 DC +4.0 to +8.0 mV 19

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A-S2000
19
(Side A)
MAIN (1) P.C.B.
CB55
VR101
R ch
CB75
DC +4.0 to +8.0 mV
VR201
Front side
(Side A)
MAIN (2) P.C.B.
L ch
10
0
minute
+4.0 to +8.0 mV
DC voltage /
DC電圧�
1
10
20
mV
VR201
CB75
DC +4.0 to +8.0 mV
MAIN (2) P.C.B.
L ch
CB55
DC +4.0 to +8.0 mV
MAIN (1) P.C.B.
R ch
VR101
Fig. 1
■
AMP ADJUSTMENT /
アンプ部調整
● アイドリング調整
●
Idling Adjustment
条件
・ 電源を入れてから20分経過後に調整を始めます。
・ 無入力信号
・ 無負荷
アイドリング調整
CB75（Lch）／CB55（Rch）のDC電圧が+4.0～+8.0 mV
になるように、VR201（Lch）／VR101（Rch）を調整し
ます。
（Fig. 1）
Condition
•
Start adjustment 20 minutes or more after the
power is turned on.
•
Non loaded condition
Idling Adjustment
Adjust VR201 (Lch)/VR101 (Rch) so that the DC volt-
age of CB75 (Lch)/CB55 (Rch) becomes +4.0 to
+8.0mV. (Fig. 1)
Precaution for handling measuring instrument
The ground side of the measuring instrument to be con-
nected to the speaker terminal of this unit must be kept in
floating condition because this unit is equipped with the
floating balanced power amplifier.
計測器取り扱い上の注意
本機はフローティングバランスパワーアンプを搭載して
いるので、本機のスピーカー出力端子に接続する計測器
のアース側はフローティング状態にする必要がありま
す。