Samsung PN51D490A1DXZA E-Manual page 46

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Fine Tune
(analog channels only)
If the reception is clear, you do not have to fine tune the channel, as this is done
automatically during the search and store operation. If the signal is weak or
distorted, fine tune the channel manually. Scroll to the left or right until the image is
clear.
Settings are applied to the channel you're currently watching.
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Fine tuned channels that have been saved are marked with an asterisk "*" on
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the right-hand side of the channel number in the channel banner.
To reset the fine-tuning, select Reset.
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English
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