Acer P1623 - Manual (Page 53)

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Security
Administrator Password
You can enter "Administrator Password" when the "Enter
Administrator Password" or "Enter Password" dialogue box
displays.
• Press to change "Administrator Password".
• The factory default of "Administrator Password" is
"1234".
If you forget your administrator password, do the following
to retrieve the administrator password:
• Enter the unique 6-digit "Universal Password" which is
printed on the Security Card that came with your
projector. This unique password will be accepted by the
projector no matter what the administrator password is.
• If the Security Card is lost, please contact your local Acer
service center.
Lock User Startup Screen
This function is set to "OFF" by default. If set to "ON", the
startup screen is locked and cannot be changed by the
"Startup Screen" and "Screen Capture" functions.