Sony MDX-C8970, Service Manual

Page: 16 / 80

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
Ω
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
Ω
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