Tuner Section - Sony WX-C570R Service Manual

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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 "POWER SELECT" switch (S501) is "OFF" position.
2. Turn ON the regulated power supply. (All LEDs on the set lights
up, and the clock is displayed.)
3. Push the preset 4 button.
4. Push the preset 5 button.
5. Press the preset 1 button for more than two seconds.
6. 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
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FM Auto Scan/Stop Level Adjustment
Setting :
D-BASS switch : OFF
TUNER button : FM
FM RF signal
generator
Carrier frequency : 98.00 MHz
: 22 dB (12.6 µ V)
Output level
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
Procedure :
1. Set to the test mode.
2. Push the TUNER button and set to FM.
Display
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3. Push the preset 3 button.
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Display
4. Adjust with the volume RV2 on TU1 so that the "FM" indica-
tion turns to " " indication on the display window.
But, in case of already indicated "
put out light " " indication and adjustment.
Display
Adjustment Location : See page 31.
co
.
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antenna
terminal
0.01 µ F
set
REG
SHUF
0 5 8 2 9 9 4 2 8
REG
SHUF
", turn the RV2 so that
REG
SHUF
m
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