MDX-C8970 - Sony Car Audio Service Manual (repair manual). Page 16

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16
FM Stereo Separation Adjustment (Wide)
Setting:
[SOURCE]
 button : FM
Procedure:
1. Adjust the volume RV3 on FM/AM tuner unit (TU101) for the
best separation.
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 17.
FM Stereo
Level meter
Level meter
signal generator
connection
reading (dB)
output channel
L-CH
L-CH
A
B
L-CH
R-CH
Adjust RV3 on TU101
for minimum reading.
R-CH
R-CH
C
R-CH
L-CH
D
FM RF signal
generator
Carrier frequency : 98.00 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%)
0.01 
µ
F
set
antenna jack (CN101)
+
level meter
10 k
 
LINE OUT jack (CNP601)
(75 
Ω)
FM Stereo Separation Adjustment (Narrow)
Setting:
[SOURCE]
 button : FM
Procedure:
1. Push the 
[SHIFT]
 button.
2. Push the 
[4]
 button four times.
3. Push the 
[5]
 button twice and set to narrow mode.
4. Adjust the volume RV4 on FM/AM tuner unit (TU101) for the
best separation.
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 17.
FM RF signal
generator
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%)
0.01 
µ
F
set
antenna jack (CN101)
+
level meter
10 k
 
LINE OUT jack (CNP601)
(75 
Ω)
FM Stereo
Level meter
Level meter
signal generator
connection
reading (dB)
output channel
L-CH
L-CH
A
B
L-CH
R-CH
Adjust RV4 on TU101
for minimum reading.
R-CH
R-CH
C
R-CH
L-CH
D
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