Tuner Section - Sony XR-CA300 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 Seek/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. AM Auto Seek/Stop Level Adjustment
XR-CA300/CA320/CA320X
FM Auto Seek/Stop Level Adjustment
Setting:
[SOURCE]
button: FM
[FREQUENCY SELECT]
switch: FM 50 k (XR-CA320/CA320X only)
FM RF signal
dummy
generator
antenna
50 Ω
50 Ω
Carrier frequency : 97.9 MHz (XR-CA300)
98.00 MHz (XR-CA320/CA320X)
: 22 dB (12.6 µV)
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.
Display
(XR-CA300)
SHUF
(XR-CA320/CA320X)
SHUF
3. Adjust with the volume RV3 on TU100 so that the "FM" indi-
cation turns to "FM0" indication on the display window.
But, in case of already indicated "FM0", turn the RV3 so that
put out light "0" indication and adjustment.
Display
(XR-CA300)
SHUF
(XR-CA320/CA320X)
SHUF
Adjustment Location: See page 17.
0.1pF
antenna
jack (ANT100)
set
MBP
MBP
MBP
MBP
15