Sony XR-L240 Service Manual page 16

XR-L240
FM Stereo Separation Adjustment
Setting:
[TUNER]
button: FM
FM RF signal
generator antenna jack (ANT100)
0.01 µ F
speaker out terminal
Carrier frequency : 98.00 MHz
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:
FM Stereo
Level meter
signal generator
connection
output channel
L-CH
R-CH
R-CH
L-CH
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specified Value: Separation more than 30 dB
Adjustment Location: See page 17.
16
level meter
10 k Ω
+
set
–
Level meter
reading (dB)
L-CH
A
B
L-CH Adjust RV2 on TU100
for minimum reading.
R-CH
C
D
R-CH Adjust RV2 on TU100
for minimum reading.
MW Auto Seek/Stop Level Adjustmant
Make this adjustment after "FM Auto Seek/Stop Level Adjust-
ment".
Setting:
[TUNER]
button: MW
AM RF signal
generator
AM dummy antenna
(50 Ω )
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
: 33 dB (44.7 µ V)
Output level
Procedure:
1. Set to the test mode. (see page 13)
[TUNER]
2. Push the button and set to FM.
[MODE]
3. Push the button and set to MW.
Display
SHUF
4. Adjust with the volume RV1 on TU100 so that the "MW" in-
dication turns to "MW0" indication on the display window.
But, in case of already indicated "MW0", turn the RV1 so that
put out light "0" indication and adjustment.
Display
SHUF
Adjustment Location: See page 17.
30 Ω 15 pF
65 pF
set
antenna jack (ANT100)
TP
TP