NEC NP4001/NP4000 - Manual (Page 100)

5. Using On-Screen Display
88
Background
Background enables you to display a blue/black screen when there is no signal. The de-
fault background is blue.
Select from the following:
ƒ Blue
ƒ Black
ƒ Logo
Security
See t Preventing the Unauthorized Use of the Projector on page 57 .
Control Panel Lock
Turn On/Off the Key Lock function for cabinet buttons.
Note:
y This Control Panel Lock does not affect the remote control functions.
y When the control panel is locked, pressing and holding the Exit button on the
projector cabinet for about 10 seconds. The setting will change to Off.