Tuner Section - Sony XR-C8220R Service Manual

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TUNER SECTION

Cautions during repair
When the tuner unit is defective, replace it by a new one be-
cause its internal block is difficult to repair.
Note: Adjust the tuner section in the sequence shown below.
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
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
button : FM
FM RF signal
generator
Carrier frequency
Output level
Mode
Modulation
Procedure:
1. Set to the test mode. (See page 18)
[SOURCE]
2. Push the
TE
L 13942296513
[3]
3. Push the preset
4. Adjust with the volume RV2 on TUX10 so that the "FM" indi-
cation 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.
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Adjustment Location: See page 22.
.
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0 dB=1 µV
antenna jack
0.01 µ F
set
: 98.00 MHz
: 22 dB (12.6 µ V)
: mono
: 1 kHz, 22.5 kHz deviation (30%)
button and set to FM.
Display
SHUF
button.
Display
SHUF
Display
SHUF
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8
FM Stereo Separation Adjustment (Wide)
Setting:
[SOURCE]
button
[SHIFT]
button
[4]
Preset (PLAY MODE)
[5]
n
(n) buttons
FM RF signal
generator
0.01 µ F
Carrier frequency : 98.00 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main : 1 kHz, 33.75 kHz deviation (45%)
:
Procedure:
FM Stereo
signal generator
output channel
L-CH
R-CH
R-CH
Q Q
L-CH
3 6 7 1 3 1 5
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 24 dB
Adjustment Location: See page 22.
co
.
– 19 –
9 4 2 8
: FM
: ON (light up SET UP and
PLAY MODE)
: WIDE mode
antenna jack
10 k Ω
set
LINE OUT REAR jack
(CN780)
sub : 1 kHz, 33.75 kHz deviation (45%)
19 kHz pilot: 7.5 kHz deviation (10%)
Level meter Level meter
connection reading (dB)
L-CH
L-CH Adjust RV3 on TUX10
for minimum reading.
R-CH
R-CH Adjust RV3 on TUX10
0 5 8 2 9 9 4 2 8
for minimum reading.
m
9 9
level meter
+
–
A
B
C
D
9 9