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Accuphase A-60 - Circuit Adjustment; Bias Current Adjustment for Power Amp; Meter Calibration

Accuphase A-60
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Notes
1. Internal input resistance of volt-ohm meter should be higher than 10k-ohms.
テスターは、入力抵
10k
Ω以上のものをお使い下さい。
2. Adjustments should be made in case of the PC Board or Transistors being changed.
調整は
PC
ボードあるいはトランジスタを交換した場合に行って下さい。
3. After feeding 1
10 watts output for about 15 minutes, check bias adjustment again.
出力
1
10
ワット前後で通電動作させた後、バイアス電流を再チェックします。
STEP ADJUST ITEM
ステップ 調
TEST EQ'PT CONNECTING POINT
検出器 接続点
Bias Current of L ch.
Power Amp
L ch.バイアス電流
V.O. Meter
set range to
less than
DC 0.3V
テスター
DC0.3V
のレンジ
Bias Current of R ch.
Power Amp
R ch.バイアス電流
Power Amp Ass'y
パワーアンプAss'y
(717-0081-00)
Test Point pin
テストポイント
VR2
forL ch.
VR1
for R ch.
Adjust for 35mV
reading of
V.O. meter
テスター
35mV調
1
2
ADJUST
調整箇所
1
2
REMARKS
調整・備考
3
Test Point
/TP2
Test Point
-11-
調整モードMETERスイッチ:OFFオン、力ミューティングリレーがONに"HOLD TIME"を8
調整モードす。調製モードは、HOLD TIME灯(図1)、図2す。
METERスイッチを"BAR"(図3)、"HOLD TIME"スイッチ5す(4)と、"50W"
る。後"50W"示、に"ソフトる(図3)
20.00 V
A-60
AG
Standard Dummy Load:8Ω/100W or more
準ダミー:8Ω/100W
Digital
Volt-meter
デジタル
Exampl/ :4Ω/100W×2=8Ω/200W
Adjust the input signal so that meter reads exact 20.0V
力50W(圧20.0V)にAG(力)調
PROCEDURE
抗8Ω/100Wし、ディジタル・メータ力20.0V調る。
Setup in adjustment mode : A power supply is turned on with Meter switch in OFF position, and it will become
adjustment mode if Hold Time switch is pushed on 8 times or more within a time which an output muting relay turns on.
Connect the Standard Dummy Load of /100W or more, and also Digital Volt-meter to A-60 output as shown
below. Adjust the input signal so that meter reads exact 20.0V
If a METER switch is made into a "BAR" position (Fig.3) and a HOLD TIME switch is pushed 5 seconds or more
(Fig4), it will become the check of "50W" display and the calibration will be started.
In several seconds, a display shows "50W" and returns to the display of a soft setting date(Fig3) after this.
SP out
Input
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