Sony CDX-C8850 Service Manual page 21

FM Stereo Separation Adjustment (WIDE)
Setting :
SOURCE button : FM1 87.5 (MHz)
FREQUENCY SELECT switch (CDX-C9500) : FM200K
FM RF signal
generator
antenna
terminal
0.01 µ F
Carrier frequency : 87.5 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 : See page 22.
level meter
10 k Ω
set
LINE OUT REAR
Level meter
reading (dB)
A
B
Adjust RV3 on TU101
for minimum reading.
C
D
Adjust RV3 on TU101
for minimum reading.
FM Stereo Separation Adjustment (NARROW)
Setting :
SOURCE button : FM1 87.5 (MHz)
FREQUENCY SELECT switch (CDX-C9500) : FM200K
FM RF signal
generator
antenna
terminal
0.01 µ F
Carrier frequency : 87.5 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 :
1. Push the SHIFT button.
2. Push the 4 button three times.
3. Push the 5 button twice and set to NARROW mode.
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 18 dB
Adjustment Location : See page 22.
level meter
10 k Ω
set
LINE OUT REAR
Level meter
reading (dB)
A
B
Adjust RV4 on TU101
for minimum reading.
C
D
Adjust RV4 on TU101
for minimum reading.
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