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ViewSonic N2690w
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(7) AFC：can be set to On or Off. If set to On, the TV will automatically detect TV
signals, and automatically adjust to the correct position in a certain frequency
range when the signal offset occurs.。
(8) Save: Save each setting for manual tuning.。
3. Channel list: Press the Left/Right button to enter the submenu; see the figure below.
You can edit the channel list according to the instructions at the bottom of the menu.