Sony SDX-3180 Service Manual page 16

FM Stereo Separation Adjustment
Setting :
D-BASS switch : OFF
SOURCE button : FMI
FM RF signal
generator
0.01 µ F
Carrier frequency : 98.00 MHz
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%)
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 28 dB
Adjustment Location : See page 17.
level meter
antenna
terminal
10 k Ω
set
LINE OUT REAR
Level meter
reading (dB)
A
B
Adjust RV4 on TU1 for
minimum reading.
C
D
Adjust RV4 on TU1 for
minimum reading.
MW Auto Scan/Stop Level Adjustment
Setting :
D-BASS switch
SOURCE n MODE button : MW
AM RF signal
generator
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
: 33 dB (44.7 µ V)
output level
Procedure :
1. Set to the test mode. (See page 15.)
2. Push the SOURCE button.
3. Push the MODE button and set to MW.
MW
ST
4. Push the preset 3 button.
MW
ST
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.
I
MW
ST
Adjustment Location : See page 17.
– 16 –
: OFF
30 Ω
15 pF
65 pF
AM dummy
antenna (50 Ω )
set
antenna
terminal
Display
SHUF
Display
SHUF
Display
SHUF