Tuner Section - Sony XR-C5200 Service Manual

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
3. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
button: FM
FREQUENCY SELECT switch: FM 200k
FM RF signal
generator
0.01 µ F
Carrier frequency : 97.9 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 13)
[SOURCE]
2. Push the button and set to FM.
3. Adjust with the volume RV2 on TU1 so that the "FM" indica-
tion 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.
Adjustment Location: See page 16.
0 dB=1 µV
antenna jack (J1)
set
Display
SHUF
Display
SHUF
FM Stereo Separation Adjustment
Setting:
[SOURCE]
button: FM
FREQUENCY SELECT switch: FM 200k
FM RF signal
generator
0.01 µ F
Carrier frequency : 97.9 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 30 dB
Adjustment Location: See page 16.
– 14 –
antenna jack (J1)
10 k Ω
set
AUDIO OUT jack (J331)
Level meter Level meter
connection reading (dB)
L-CH
L-CH Adjust RV4 on TU1
for minimum reading.
R-CH
R-CH Adjust RV4 on TU1
for minimum reading.
level meter
+
–
A
B
C
D