Sony CDX-L350 Service Manual page 16

CDX-L350/L450X/L470X
QQ
3 7 63 1515 0
FM Stereo Separation Adjustment
Setting :
SOURCE button
FREQUENCY SELECT switch (L450X/L470X) : FM 50k
FM RF signal
generator
antenna
terminal
0.01 µF
Carrier frequency : 97.9 MHz (L350)
: 98.0 MHz (L450X/L470X)
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
Level meter
signal generator
connection
output channel
L-CH L-CH
R-CH L-CH
TE
L 13942296513
R-CH R-CH
L-CH R-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 :
RV2
FM Auto Scan/Stop
Level Adjustment
TU601(Component Side)
www
RV1
FM Stereo Separation
Adjustment
.
16
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: FM
level meter
10 kΩ
set
AUDIO OUT REAR
Level meter
reading (dB)
A
B
Adjust RV1 on TU601
for maximum reading.
C
D
Adjust RV1 on TU601
for maximum reading.
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8
AM Auto Scan/Stop Level Check
Note : This adjustment should be performed after the FM Auto
Scan / Stop Level Adjustment is done.
Setting :
SOURCE t MODE button
FREQUENCY SELECT switch (L450X/L470X) : AM 9k
AM RF signal
generator
Carrier frequency : 1000 kHz (L350)
: 999 kHz (L450X/L470X)
Output level : 30 dB (44.7 µV)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
Procedure :
1. Set to the test mode. (See page 15)
Q Q
2. Push the SRC button.
3 6 7 1 3
3. Push the MODE button and set to AM.
AM
ST
4. Check that the "AM" indication turns to "AM0" indication on
the display window.
AM0 Z
ST
*2: L450X/L470X are indicates "999".
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.
2 9 9 4 2 8
: AM
30 Ω
65 pF
AM dummy
antenna (50 Ω)
set set
antenna
terminal
1 5 0 5 8 2 9 9 4
Display
1 00Z Z Z 0
2
SHUF
Display
1 00Z Z Z 0
2
SHUF
m
co
9 9
15 pF
2 8 9 9