Electrical Adjustments; Tuner Section - Sony CDX-C8850R Service Manual

CD SECTION
CD section adjustments are done automatically in this set.
0 dB = 1 µV

TUNER SECTION

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 (WIDE)
3. FM Stereo Separation Adjustment (NARROW)
4. FM RDS S-Meter Adjustment
5. 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 FM.
3. Push the preset 3 button.
4. Adjust with the volume RV2 on TU101 so that the "FM"
Adjustment Location : See page 24.
SOURCE button : FM 98.00 (MHz)
FM RF signal
generator
0.01 µ F
Carrier frequency : 98.00 MHz
Output level : 22 dB (12.6 µV)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
Display
SHUF
Display
SHUF
indication turns to "FM0" indication on the display window.
But, in case of already indicated "FM0", turn the RV2 so that
put out light "0" indication and adjustment.
Display
SHUF
antenna
terminal
set
21