Electrical Adjustments; Tuner Section - Sony CDX-3250 Service Manual

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.

TUNER SECTION

0 dB = 1 µV
Cautions during repair
When the tuner unit is defective, replace it by a new one
because its internal block is difficult to repair.
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. MW Auto Scan/Stop Level Adjustment
SECTION 3

ELECTRICAL ADJUSTMENTS

FM Auto Scan/Stop Level Adjustment
Setting :
Procedure :
1. Set to the test mode.
2. Push the SOURCE button and set to FMI.
3. Push the preset 3 button.
4. Adjust with the volume RV2 on TU1 so that the "FMI"
Adjustment Location : See page 17.
– 15 –
D-BASS switch : OFF
SOURCE button : FMI
FM RF signal
generator
0.01 µF
Carrier frequency : 98.00 MHz
Output level : 22 dB (12.6 µV)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
Display
FMI
Display
FMI
indication turns to "FMII" indication on the display window.
But, in case of already indicated "FMII", turn the RV2 so that
put out light "I" indication and adjustment.
Display
FMII
antenna
terminal
set
SHUF
SHUF
SHUF