Acer X1213 - Manual (Page 33)

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Note: The following reminder appears on the screen when turning on 3D or
after the projector is re-started with 3D enabled.
Setting
Menu Location Chooses the OSD menu location on the display screen.
Source Lock
When this function is turned off, the projector will search for
other signals if the current input signal is lost. When this
function is turned on, it will lock the current source channel
before you press "SOURCE" on the control panel or remote
control for next channel.
Closed Caption
Selects a preferred closed captioning mode from CC1, CC2,
CC3, CC4, (CC1 displays captions in the primary language in
your area). Select "Off" to turn off the captioning feature.
This function is only available when a composite video or S-
Video input signal is selected and its system format is NTSC.
Set your screen aspect ratio to 4:3. The function is not
available when the aspect ratio is "16:9" or 16:9 format
detected under "Auto mode".
(X1110A/X1210/X1210A/
X1210K/X1210S/X1213/X1216)
(X1110)