Electrical Adjustments - Sony CDX-4240R Service Manual

SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION 0dB=1,uV
Cautions during repair
When the tuner unit is defective, replace it by a new one
because its internal block is difficult to repair.
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and MW Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the "OFF" mode.
2. Push the preset |4} button.
3. Push the preset | 5} button.
4. Press the preset [1] button for more than two seconds.
5. Then the display indicates all lights, the test mode is set.
<Release the Test Mode>
1. Push the |OFF] button.
Note on Adjustment
The adjustments of tuner section, should be performed according
to the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. FM RDS S-Meter Adjustment
4. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting :
D-BASS switch : OFF
SOURCE button : FM
FM PF signal
generator
antenna
terminal
0.01 uF ma
CD
Carrier frequency : 98.00 MHz
Output level : 22 dB (12.6 pV)
Mode mono
Modulation 11 kHz, 22.5 kHz deviation (30%)
Procedure :
1. Set to the test mode.
2. Push the [SOURCE |button and set to FM.
Display
E M Un a ee
GA
3. Push the preset [3] button.
Display
2 M SHUF
_t CICITATA
_! —I ILI LI
4. Adjust with the volume RV2 on TU601 so that the "FM"
indication turns to "FMO" indication on the display window.
But, in case of already indicated "FMO", turn the RV2 so that
put out light "O" indication and adjustment.
Display
Adjustment Location : See page 18.
eee fee
ae De ee Ce ee SO C