Sony XES-Z50 Service Manual page 47

FM STEREO SEPARATION ADJUSTMENT
Setting:
TUN/AUX button : FM
FM RF signal
antenna (MAIN) terminal
generator
0.01 µ F
Carrier frequency : 97.9 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%)
Adjustment Procedure:
FM Stereo
Level meter
signal generator
connection
output channel
L-CH L-CH
R-CH L-CH
R-CH R-CH
L-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 28 dB
Adjustment Location: Control Unit (FM/AM tuner unit)
(See page 50)
FM NOISE FOCUS ADJUSTMENT
Setting:
TUN/AUX button: FM
FM RF signal
antenna (MAIN) terminal
generator
0.01 µ F
Carrier frequency : 97.9 MHz
Output level : 60 dB (1 mV)
Mode : stereo
Modulation : 1 kHz, 75 kHz deviation
Adjustment Procedure:
1. Tune the set to 97.9 MHz.
2. The then output level is supposing than (A) dB.
3. Adjust with the volume RV205 on FM/AM tuner unit so that
the output level is (A) –32 dB then signal generator input set
to –20 dB.
Adjustment Location: Control Unit (FM/AM tuner unit)
(See page 50)
level meter
10 k Ω
+
set
–
LINE OUT (FRONT) jack
Level meter
reading (dB)
A
B
Adjust RV204 on FM/AM
tuner unit for minimum
reading.
C
D
Adjust RV204 on FM/AM
tuner unit for minimum
reading.
level meter
10 k Ω
+
set
–
LINE OUT (FRONT) jack
AM AUTO SCAN/STOP LEVEL ADJUSTMENT
Note: Make this adjustment after "FM AUTO SCAN/STOP
LEVEL ADJUSTMENT".
Setting:
TUN/AUX button: AM
AM RF signal
generator
AM dummy antenna
(50 Ω )
Carrier frequency : 1000 kHz
30% amplitude
modulation by
1 kHz signal
: 33 dB (44.7 µ V)
Output level
Adjustment Procedure:
1. Set to the test mode. (See page 46.)
2. Press the TUN/AUX button on the wireless remote com-
mander to select AM.
3. Press the LIST button on the wireless remote commander to
display "PRESET NAME LIST".
4. Using cursor buttons on the wireless remote commander, se-
lect preset No.3, and press the ENTER button.
5. Adjust with the volume RV201 on FM/AM tuner unit so that
the "AM" indication turns to "AM0" indication on the display
window.
But, in case of already indicated "AM0", turn the RV201 so
that put out light "0" indication and adjustment.
Adjustment Location: Control Unit (FM/AM tuner unit)
– 47 –
30 Ω 15 pF
65 pF
set
antenna (MAIN) terminal
DISPLAY
DISPLAY
DISPLAY
(See page 50)