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Sony ST-S444ES Service Manual page 5

Fm stereo /fm-am tuner
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SECTION
1
ST-S444ES
OUTLINE
1-1.
FUNCTION
OF CONTROLS
Each number in the text is keyed to that of the photo above.
@ POWER switch
Depress to turn on the power. To turn the power off,
press the switch again.
@ TUNE MODE button
To tune in a station with the automatic tuning system,
press this button so that the TUNING
AUTO
indicator
lights up.
When
you
want
to tune with
manual
tuning
system,
press the button again so that the TUNING
MANUAL
in-
dicator lights up.
AM
(FY EI TT)
kHz
FM
Li Li, |
MHz
STEREO
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HI-BLENDe
ON
leds
MUTING
e
ON.
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e
STEREO
MONO
|
TUNING
«
AUTO
MANUAL
SIGNAL
PROGRAMM 1.20314)
iF BAND * WIDE
NARROW
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|
© MUTING/MODE button
This button serves a dual purpose: it is a muting switch
and FM mode selector.
To tune in a strong FM station, press the button so that
the MUTING ON and MODE STEREO indicators light up.
In this mode,
the muting
circuit will pe activated
to
eliminate interstation
noise while tuning and the FM
station will be received in stereo mode.
When you want to tune in a very weak FM staion, press
the button again so that the MUTING
OFF and MODE
MONO
indicators light up. The muting circuit will be
deactivated and the FM station is received in monaural
mode. In this mode, keep the amplifier volume down to
avoid speaker damage caused by interstation noise dur-
ing tuning.
—5—
ST-S444ES
© FM/AM selector button
Selects
the desired
band:
FM
or AM.
The
selected
band wili be indicated in the display window.
© !F BAND button
Normally press this button so that the IF BAND WIDE in-
dicator lights up. Low-distortion, hi-fi FM broadcasting
sound can be obtained. When
there is interference by
adjacent stations, press the button so that the IF BAND
NARROW
indicator lights up. The higher selectivity will
improve the reception.
@ HI-BLEND button
When FM stereo signals are weak and noisy, press this
button so that the HI-BLEND ON indicator lights up.
This will provide better reception, although the stereo
effect at high frequencies is slightly reduced.
To deactivate the high-biend circuit, press the button
again. The HI-BLEND OFF indicator will light up.
@ CAL TONE button
Normally press this button so that the CAL TONE
in-
dicator is not lit.
To obtain a 400 Hz, 50 % modulated signal for adjusting
the recording level on a cassette deck, press the button.
The CAL TONE indicator will light up.
Generally, on cassette decks, adjust the recording level
so that the peak meters to —4dB, and on reel-to-reel
tape decks the peak level meters deflect as close as
possible to 0dB. However, depending on the broadcast
programs
or
the
tapes
you
use,
some
further
ad-
justments
may
be necessary.
You can
determine
the
most
appropriate
recording
level
for your
tape deck
after several trials, using the suggested levels as a star-
ting point.
To deactivate the cal tone circuit, press the CAL TONE
button again.
@ TUNING
button
Press either side of this button to change the frequency.
Press the left side ( - ) to go to a lower frequency and the
right side ( + ) to go to a higher.
During automatic tuning:
Press to start automatic fre-
quency scanning. The frequencies below or above that
shown on the display window will be scanned automa-
tically until a signal is received. To resume
scanning,
press the button again.
During manual
tuning:
Press and keep the TUNING
button depressed to change the frequency continuously
until the figures in the frequency
display window
ap-
proach the desired frequency. The frequency figures will
change
rapidly. To change
the frequency
slowly
(in
0.05 MHz
steps) to tune in a station accurately,
press
the button and release immediately.
When the frequency figures reach the end of the tuning
range, the frequency will then be scanned from the op-
posite end of the tuning range.
© Station
preset
buttons
and
station
identification
windows
To call up a memorized
station, press the appropriate
button.
Station labels (supplied) identifying memorized stations
can
be placed
in the station
identification
windows
above the buttons.
@ SCAN/READ button
This button
has a dual purpose.
With the PROGRAM
switch set to OFF, it works as
a memory SCAN
button
and with the PROGRAM
switch set to ON, as a program
READ button.
SCAN
button:
Press
to automatically
scan
the sta-
tions memorized on the station preset buttons.
READ button:
By pushing this button, the programmed
station order can be checked.
@ MEMORY/SET button
This button has a dual purpose.
With the PROGRAM
switch set to OFF, it works as
a MEMORY
button and
with the PROGRAM
switch set to ON, as a program SET
button.
MEMORY button:
Press to memorize the tuned station
to a station preset button. The MEMORY
indicator will
appear
in the
frequency
display
window
for a few
seconds
indicating that the preset memory
circuit is
standing by.
SET button:
Press to program the preset stations in
the desired order. The MEMORY
indicator will appear in-
dicating that the program circuit is standing by.
@® PROGRAM
switch
To use the program function, set this switch to ON. For
ordinary
use, be sure to keep the switch
in the OFF
position.
Display window
® IF BAND indicator
Indicates the setting of the IF BAND button.
@® HI-BLEND indicator
Indicates the setting of the HI-BLEND button.
® MUTING
indicator
Indicates the setting of the MUTING/MODE
button.
@ MODE indicator
Indicates the setting of the MUTING/MODE button.
@ TUNING indicator
The AUTO indicator shows the automatic tuning mode,
and the MANUAL indicator, the manual tuning mode set
with the TUNE MODE button.
® CAL TONE indicator
Lights up to show that a 400 Hz calibrating tone signal
is provided by the CAL TONE button.
® ME
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