Sony ST-SB920 Service Manual page 6

Stereo Level Adjustment
Setting:
IF BAND : WIDE
ANT ATT : OFF
FM RF SSG
FM ANTENNA (75 Ω )
Modulation : Stereo Standard signal
Output level : 18 µ V (25dB) (at 75 Ω open)
Procedure:
1. Tune the set to 98 MHz.
2. Adjust RV251 to the point (moment) when the "STEREO"
indicator will change from going off to going on.
Narrow Gain Adjustment
Setting:
IF BAND : NARROW
ANT ATT : OFF
FM RF SSG
FM ANTENNA (75 Ω )
Modulation : Stereo Standard signal
Output level : 18 µ V (25dB) (at 75 Ω open)
Procedure:
1. Tune the set to 98 MHz.
2. Set "IF BAND : NARROW" according to the procedure of
"How to switch IF BAND WIDE/NARROW" on page 6.
3. Adjust RV231 to the point (moment) when the "STEREO"
indicator will change from going off to going on.
FM Meter Level Adjustment
Setting:
IF BAND : WIDE
ANT ATT : OFF
FM RF SSG
FM ANTENNA (75 Ω )
Modulation : Stereo Standard signal
Output level : 3mV (76dB) (at 75 Ω open)
Procedure:
1. Tune the set to 98 MHz.
2. Press DISPLAY button to display the digital signal, then adjust
RV221 to be display as "SIG 70dB".
Stereo Separation Adjustment
Setting:
IF BAND : WIDE
set
Procedure:
1. Refer to "How to switch IF BAND WIDE/NARROW" on page
set
L-CH Stereo separation : A – B
R-CH Stereo separation : C – D
The separations of both channels should be equal.
set
— 6 —
FM RF SSG
FM ANTENNA (75 Ω )
Modulation : Stereo Standard signal
Output level : 6mV (76dB) (at 75 Ω open)
6.
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
level meter
set
LINE OUT
Level meter
reading (dB)
A
B
Adjust RV301 for minimum
reading on Level meter
C
D
Adjust RV301 for minimum
reading on Level meter