Read Sony XM-GTR2022 Service Manual online
XM-GTR2022
11
SECTION 3
ELECTRICAL ADJUSTMENT
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.
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.
perature of about 25°C.
Setting :
Procedure :
1. Turn the variable resistors RV103 (L-CH) and RV203 (R-CH)
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.
bias current.
2. The input signal is to be no signal.
3. Apply the voltage to the B+ and REM terminals from the stabi-
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.
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).
steps of 700 mA (total of 1.4 A).
5. After adjustment, check that the power current is at 1.65 to 2.05
A.
Adjustment Location : AMPLIFIER board (component side)
Stabilized
power supply
power supply
B+, REM terminal
set
GND terminal
RV203
BIAS ADJUSTMENT
(R-CH)
RV103
BIAS ADJUSTMENT
(L-CH)
– AMPLIFIER BOARD (COMPONENT SIDE) –
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