Electrical Adjustment - Sony XM-GTR2022 Service Manual

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Operating instructions (2 pages)

Specifications (2 pages)

Table Of Contents

Table of Contents

Bias Adjustment

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

Q113 are replaced. Adjust RV203 if any of Q208 through

Q213 are replaced.

Condition : This adjustment should be performed about one min-

ute after the remote mode is turned on at a room tem-

perature 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 B+ and REM terminals from the stabi-

lized power supply and gradually increase it up to 12.0 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 700 mA (total of 1.4 A).

5. After adjustment, check that the power current is at 1.65 to 2.05

Adjustment Location : AMPLIFIER board (component side)

– AMPLIFIER BOARD (COMPONENT SIDE) –

RV203

BIAS ADJUSTMENT

(R-CH)

SECTION 3