Tuner Section - Sony XR-C8220R Service Manual

TUNER SECTION

0 dB=1 µV
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
0.01 µ F
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. (See page 18)
[SOURCE]
2. Push the button and set to FM.
Display
[3]
3. Push the preset button.
Display
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.
Display
Adjustment Location: See page 22.
antenna jack
set
SHUF
SHUF
SHUF
FM Stereo Separation Adjustment (Wide)
Setting:
[SOURCE]
button
[SHIFT]
button
[4]
Preset (PLAY MODE)
[5]
n
(n) buttons
FM RF signal
generator
antenna jack
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%)
sub : 1 kHz, 33.75 kHz deviation (45%)
: 19 kHz pilot: 7.5 kHz deviation (10%)
Procedure:
FM Stereo
signal generator
output channel
L-CH
R-CH
R-CH
L-CH
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.
– 19 –
: FM
: ON (light up SET UP and
PLAY MODE)
: WIDE mode
level meter
10 k Ω
+
set
–
LINE OUT REAR jack
(CN780)
Level meter Level meter
connection reading (dB)
A
L-CH
B
L-CH Adjust RV3 on TUX10
for minimum reading.
C
R-CH
D
R-CH Adjust RV3 on TUX10
for minimum reading.