Acer AL1913 Service Manual page 16

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The OSD disappears several seconds after you stop pressing the
buttons while performing an adjustment.
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Any changes are automatically saved in the memory when the OSD
disappears. Turning off the power should be avoided while using the
menu.
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Adjustments for clock, phase and positions are saved for each signal
timing. Except for these adjustments, all other adjustments have only
one setting which applies to all signal timings.
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The color will change from white to pink while the function is selected.
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