Sony CDX-L450V Service Manual page 16

CDX-L450V
FM Stereo Separation Adjustment
Setting :
SOURCE button
FREQUENCY SELECT switch : FM 50k
FM RF signal
generator
antenna
terminal
0.01 µ F
Carrier frequency : 98.0 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
Level meter
signal generator
connection
output channel
L-CH L-CH
R-CH L-CH
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)
RV1
FM Stereo Separation
Adjustment
16
: FM
level meter
10 k Ω
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.
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 : AM 9k
AM RF signal
generator
AM dummy
antenna (50 Ω )
Carrier frequency : 999 kHz
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)
2. Push the SRC button.
3. Push the MODE button and set to AM.
Display
AM
ST
4. Check that the "AM" indication turns to "AM0" indication on
the display window.
Display
AM0 Z
ST
: AM
30 Ω
15 pF
65 pF
set set
antenna
terminal
999
SHUF
999
SHUF