Sony MDX-C7970/C7970R Service Manual page 20

FM Stereo Separation Adjustment (Narrow)
(MDX-C7970R)
Setting:
[SOURCE]
button : FM
[SHIFT]
button : ON (light up SET UP and PLAY MODE)
(PLAY MODE) →
Preset [4]
[5]
(→) buttons : NARROW mode
FM RF signal
antenna jack (J1)
generator
0.01 µ F
(75 Ω)
Carrier frequency : 98.00MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main : 1 kHz, 20 kHz deviation (26.7%)
sub : 1 kHz, 20 kHz deviation (26.7%)
: 19 kHz pilot: 7.5 kHz deviation (10%)
Procedure:
1. Adjust the volume RV4 on FM/AM tuner unit (TU1) 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 22.
level meter
10 k Ω
+
set
–
LINE OUT jack (CNP300)
Level meter
reading (dB)
A
L-CH
B
R-CH Adjust RV4 on TU1
for minimum reading.
C
R-CH
D
L-CH
FM RDS S-Meter Adjustment (MDX-C7970R)
Setting:
[SOURCE]
button : FM
FM RF signal
generator
Carrier frequency
Output level
Mode
Modulation
Procedure:
1. Set to the test mode. (See page 18)
[SOURCE]
2. Push the
[10]
3. Push the preset
4. Adjust RV1 on MAIN board so that the display indication is
"13.2".
Specification: Display indication: 13.0 to 13.4
Adjustment Location: See page 22.
– 20 –
antenna jack (J1)
0.01 µ F
set
: 98.00 MHz
: 35 dB (56.2 µ V)
: mono
: no modulation
button and set to FM.
Display
SHUF
button .
Display
SHUF