Electrical Adjustment - Sony XM-1252GTR Service Manual

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Operating instructions manual (20 pages)

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Table Of Contents

Table of Contents

Enlarged version

XM-1252GTR

Bias Adjustment

Note : In Bias Adjustment, adjust RV103 if any of Q108 through

Q111 are replaced. Adjust RV203 if any of Q208 through

Q211 are replaced.

Condition : This adjustment should be performed about one minute

after the remote mode is turned on at a room tempera-

ture of about 25°C.

Setting :

Stabilized

Power supply

Procedure :

1. Turn the variable resistors RV103 (L-CH) and RV203 (R-CH)

full clockwise as seen from the component side to minimize the

bias current.

2. The input signal is to be no signal.

3. Apply the voltage to the +12V and REM terminals from the sta-

bilized power supply and gradually increase it up to 14.4 V while

checking for any unusual current.

4. Adjust each of RV103 (L-CH) and RV203 (R-CH) so that the

power current of the stabilized power supply is increased in steps

of 550 mA.

Adjustment Location : AMP board (component side)

– AMP BOARD (COMPONENT SIDE) –

RV103

BIAS ADJUSTMENT

(L-CH)

SECTION 3