XR-1300R, XR-C2300R - Sony Car Audio Service Manual (repair manual). Page 14

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14
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. FM RDS S-Meter Adjustment
4. MW Auto Seek/Stop Level Adjustment
FM Auto Seek/Stop Level Adjustment
Setting:
[TUNER]
 (1300R) or 
[SOURCE]
 (C2300R) button: FM
Procedure:
1. Set to the test mode. (See page 12)
2. Push the 
[TUNER]
 (1300R) or 
[SOURCE]
 (C2300R) button
and set to FM.
Display
3. Adjust with the volume RV2 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 RV2 so that
put  out light “0” indication and adjustment.
Display
Adjustment Location: See page 16.
FM RF signal 
generator
dummy
antenna
Carrier frequency : 98.0 MHz
Output level
: 22 dB (12.6 
µ
V)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
antenna
jack (CN100)
set
50 
50 
0.1pF
SHUF
SHUF
FM Stereo Separation Adjustment
Setting:
[TUNER]
 (1300R) or 
[SOURCE]
 (C2300R) button: FM
Procedure:
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.
FM Stereo
Level meter
Level meter
signal generator
connection
reading (dB)
output channel
L-CH
L-CH
A
B
R-CH
L-CH
Adjust RV4 on TU100
for minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on TU100
for minimum reading.
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level
: 70 dB (3.2 mV)
Mode
: stereo
Modulation
: main: 1 kHz, 20 kHz deviation (26.7%)
  sub: 1 kHz, 20 kHz deviation (26.7%)
:
 19 kHz pilot: 7.5 kHz deviation (10%)
0.01 
µ
F
set
antenna jack (CN100)
+
speaker out terminal (1300R) or 
AUDIO OUT jack (CN400) (C2300R)
level meter
10 k
Page of 38
Display

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