Sony STR-S255 - Page 3

STR-S255 STR-S255
SECTION 1
ELECTRICAL ADJUSTMENTS
FUNCTION OF CONTROLS
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FM Muting Level Adjustment
7
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FM rf signal
generator
FM ANTENNA terminal
(FM 75 Q)
Carrier frequency: 98 MHz
Modulation: 1 kHz, 40 kHz deviation
Output level: 17.9 nV (25 dB)
1. Push the TUNING (4, —) button for 98 MHz.
2. Adjust RV351, then check that “TUNED” is
flashed on the indicator.
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FM/AM BAND selector 12] HEADPHONES jack (stereo phone jack)
Connect the headphones. The headphone volume can be
FM Discriminator Alignment (NULL Check)
[2] AUTO TUNING (FM) button adjusted with VOLUME. For headphone listening only, release Seiting:
Select the automatic or manual tuning mode. both SPEAKERS. 3
_ FM rf signal
3] TUNING buttons [13] SPEAKERS selectors generator
Press to change the frequency. To change the frequency
continuously, keep the button depressed.
Select speaker system A or B, or both.
RV351
14} 5-band graphic equalizer
>
STEREO indicator
Lights when an FM stereo program of sufficient signal
strength is tuned in.
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MEMORY button
Memorizes a station on a 10-key station preset selector.
| 6! Display window
~
FUNCTION indicators
Lights to show the current input source.
FUNCTION buttons
VIDEO: For listening to or recording the sound from video
equipment or auxiliary programs (connected to VIDEO
inputs).
TAPE: For listening to a tape.
CD: For listening to or recording a compact disc.
TUNER: For listening to or recording the radio.
PHONO: For listening to or recording a phono record.
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10-key station preset selector
Used for quick tuning of frequently used radio stations.
LS
ENTER button
Completes station preset selections.
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POWER switch
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Slide downward or upward to adjust the tone. First set all
controls to the center position (‘0’), then slide each control
gradually until you perceive an improvement. When the tone
adjustment using the equalizer is not required, set the controls
to the center position.
BALANCE control
Adjusts the balance of the left and right channel output level.
VOLUME control
22.5kHz frequency
FM ANTENNA terminal
Carrier frequency: 98 MHz
Modulation: 1 kHz, 40 kHz deviation
Output level: 1 mV (60 dB)
IFT351
TP351
VOM
(DC range)
RV352
AM Muting Level Adjustment
Setting:
BAND selector switch: AM
AM rf signal
Procedure:
generator
1. Push the TUNING (+, —) button for 98 MHz. Put the lead-wire
antenna close to
the set.
2. Adjust IFT351 for 0 V reading on the VOM.
Ceo
30% amplitude Carrier frequency: 999 kHz
modulation by Output level: 0.79 mV (58 dB)
400 Hz signal
1. Push the TUNING (+, —) button for 999 kHz.
2. Adjust RV352, then check that “TUNED” is
flashed on the indicator.