Read Sony ST-S3000ES Service Manual online
— 5 —
FM Discriminator ADJUSTMENT
(NULL and MONO Distortion Adjustment)
(NULL and MONO Distortion Adjustment)
Setting :
IF BAND : WIDE
ANT ATT : OFF
IF BAND : WIDE
ANT ATT : OFF
FM RF SSG
1 kHz
highpass
filter
highpass
filter
distortion meter
FM ANTENNA (75
Ω
)
LINE OUT
Modulation: Monaural Standard signal
Output level: 6mV (76dB) (at 75
Output level: 6mV (76dB) (at 75
Ω
open)
Procedure :
1. Tune the set to 98 MHz.
2. Adjust IFT252 for 0V reading on the digital voltmeter.
1. Tune the set to 98 MHz.
2. Adjust IFT252 for 0V reading on the digital voltmeter.
.................. NULL
3. Adjust IFT253 for a minimum reading on the distortion meter.
.................. MONO Distortion (THD)
4. Repeat the adjustments of 2 and 3 several times.
Note : When replacing the ceramic filter, perform this alignment.
TP251
NULL terminal
NULL terminal
Digital Voltmeter
(DC range)
(DC range)
set
Stereo Level Adjustment
Setting :
IF BAND : WIDE
ANT ATT : OFF
IF BAND : WIDE
ANT ATT : OFF
FM RF SSG
set
FM ANTENNA (75
Ω
)
Modulation: Stereo Standard signal
Output level: 18µV (25dB) (at 75
Output level: 18µV (25dB) (at 75
Ω
open)
Procedure :
1. Tune the set to 98 MHz.
2. Adjust RV251 to the point (moment) when the “STEREO”
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.
FM RF SSG
set
FM ANTENNA (75
Ω
)
Modulation: Stereo Standard signal
Output level: 18µV (25dB) (at 75
Output level: 18µV (25dB) (at 75
Ω
open)
Narrow Gain Adjustment
Setting :
IF BAND : NARROW
ANT ATT : OFF
IF BAND : NARROW
ANT ATT : OFF
Procedure :
1. Tune the set to 98 MHz.
2. Set “IF BAND : NARROW” according to the procedure of “How
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” indi-
cator will change from going off to going on.
FM Meter Level Adjustment
Setting :
IF BAND : WIDE
ANT ATT : OFF
IF BAND : WIDE
ANT ATT : OFF
FM RF SSG
FM ANTENNA (75
Ω
)
Modulation: Stereo Standard signal
Output level: 3mV (76dB) (at 75
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
1. Tune the set to 98 MHz.
2. Press DISPLAY button to display the digital signal, then adjust
RV221 to be displayed as “SIG 70dB”.
Stereo Separation Adjustment
Setting :
IF BAND : WIDE
IF BAND : WIDE
set
FM RF SSG
FM ANTENNA (75
Ω
)
set
LINE OUT
level meter
Modulation: Stereo Standard signal
Output level: 6mV (76dB) (at 75
Output level: 6mV (76dB) (at 75
Ω
open)
Procedure :
1. Refer to “How to switch IF BAND WIDE/NARROW” on page
1. Refer to “How to switch IF BAND WIDE/NARROW” on page
6.
FM stereo
Signal generator
Output channel
Level meter
connection
Level meter
reading (dB)
L-CH
L-CH
A
B
Adjust RV301 for minimum
reading on Level meter
reading on Level meter
R-CH
L-CH
R-CH
R-CH
C
D
Adjust RV301 for minimum
reading on Level meter
reading on Level meter
L-CH
R-CH
L-CH Stereo separation : A - B
R-CH Stereo separation : C - D
R-CH Stereo separation : C - D
The separations of both channels should be equal.
Click on the first or last page to see other ST-S3000ES service manuals if exist.