Electrical Adjustments - Sony CDX-L250 Service Manual

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TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM Auto Scan/Stop Level check can be
performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Turn ON the regulated power supply to ACC and BATT
terminals is "OFF" position (display 1:00).
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 and LED on the front panel indicates all lights,
the test mode is set.
<Release the Test Mode>
1. Push the OFF button.
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ELECTRICAL ADJUSTMENTS

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SECTION 3
2 9
8
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.
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. AM Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting :
SOURCE button
FREQUENCY SELECT switch (L430X) : FM 50k
FM RF signal
generator
Carrier frequency : 97.9 MHz (L250)
Output level
Mode
Q Q
Modulation
3 6 7 1 3 1 5
Procedure :
1. Set to the test mode.
2. Push the SRC button and set to FM.
FM
ST
3. Adjust with the volume RV2 on TU601 so that the "FM"
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.
FM0 Z
ST
*1: L430X are indicates "98.00".
Adjustment Location : See page 16.
co
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CDX-L250/L430X
9 4 2 8
0 dB = 1 µV
: FM
antenna
terminal
0.01 µF
set
: 98.0 MHz (L430X)
: 22 dB (12.6 µV)
: mono
: 1 kHz, 22.5 kHz deviation (30%)
0 5 8 2 9 9 4 2 8
Display
97. 9 0 Z l
1
SHUF
Display
97. 9 0 Z l
1
SHUF
m
9 9
9 9
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