Read Sony CDX-3250 Service Manual online
– 16 –
FM Stereo Separation Adjustment
Setting :
D-BASS switch : OFF
SOURCE button : FMI
SOURCE button : FMI
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level
Output level
: 70 dB (3.2 mV)
Mode
: stereo
Modulation
: main : 1 kHz, 20 kHz deviation (26.5%)
sub : 1 kHz, 20 kHz deviation (26.5%)
19 kHz pilot : 7.5 kHz deviation (10%)
19 kHz pilot : 7.5 kHz deviation (10%)
antenna
terminal
terminal
set
0.01 µF
10 k
Ω
level meter
LINE OUT REAR
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 TU1 for
minimum reading.
minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on TU1 for
minimum reading.
minimum reading.
L-CH stereo separation : A – B
R-CH stereo separation : C – D
The separations of both channels should be equal.
R-CH stereo separation : C – D
The separations of both channels should be equal.
Specification : Separation more than 28 dB
Adjustment Location : See page 17.
Procedure :
MW Auto Scan/Stop Level Adjustment
Make this adjustment after “FM Auto Scan/Stop Level Adjustment”
Setting :
Setting :
D-BASS switch
: OFF
SOURCE
n MODE button : MW
AM RF signal
generator
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
output level
30% amplitude
modulation by
1 kHz signal
output level
: 33 dB (44.7 µV)
AM dummy
antenna (50
antenna (50
Ω
)
antenna
terminal
terminal
set
15 pF
30
Ω
65 pF
Procedure :
1. Set to the test mode. (See page 15.)
2. Push the SOURCE button.
3. Push the MODE button and set to MW.
1. Set to the test mode. (See page 15.)
2. Push the SOURCE button.
3. Push the MODE button and set to MW.
Display
4. Push the preset 3 button.
Display
5. Adjust with the volume RV1 on TU1 so that the “I”
indication on the display window.
But, in case of already indicated “I”, turn the RV1 so that put
out light “I” indication and adjustment.
But, in case of already indicated “I”, turn the RV1 so that put
out light “I” indication and adjustment.
Display
SHUF
ST
MW
SHUF
ST
MW
I
SHUF
ST
MW
Adjustment Location : See page 17.
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