Acer P7500 - Manual (Page 37)

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Setting
Menu Location Choose the menu location on the display screen.
Source Lock When source lock is turned "off", the projector will search for
other signals if the current input signal is lost. When source lock is
turned "on", it will "lock" the current source channel unless you
press "Source" button on the remote control for the 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. This function is not
available when the aspect ratio is "16:9" or "Auto".
Security Security
This projector provides a useful security function for the
administrator to manage usage of the projector.
Press
to change the "Security" setting. If the security function
is enabled, your must enter the "Administrator Password" first
before changing the security settings.
• Select "On" to enable the security function. The user has to
enter a password to operate the projector. Please refer to the
"User Password" section for details.
• If "Off" is selected, then the user can turn on the projector
without password.
Note: For 1080P models, to get best quality for you desired image, suggest
end-user set PC resolution to 1920x1080 before you use this function.