Read Sony XM-2150GSX Service Manual online
8
XM-2150GSX
Bias Adjustment
Note : In Bias Adjustment, adjust RV105 if any of Q108 through
Q113 are replaced. Adjust RV205 if any of Q208 through
Q213 are replaced.
Q213 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.
ture of about 25°C.
Setting :
SECTION 3
ELECTRICAL ADJUSTMENT
– MAIN BOARD (COMPONENT SIDE) –
RV105
BIAS ADJUSTMENT
(L-CH)
RV205
BIAS ADJUSTMENT
(R-CH)
Procedure :
1. Turn the variable resistors RV105 (L-CH) and RV205 (R-CH)
1. Turn the variable resistors RV105 (L-CH) and RV205 (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 14.4 V while
checking for any unusual current.
checking for any unusual current.
4. Adjust each of RV105 (L-CH) and RV205 (R-CH) so that the
power current of the stabilized power supply is increased in steps
of 500 mA (total of 1 A).
of 500 mA (total of 1 A).
5. After adjustment, check that the power current is at 1.3 to 2.0 A.
Adjustment Location : Main board (component side)
Stabilized
Power supply
B+, REM terminal
set
GND terminal
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