Sony MDX-C8970 Service Manual page 16

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