NEC PH3501QL User Manual page 60

7. Type in the same combination of ▲▼◀▶ buttons and press the ENTER button.
The confirmation screen will be displayed.
8. Select [YES] and press the ENTER button.
The SECURITY function has been enabled.
To power on the projector when [SECURITY] is enabled:
1. Press the (POWER) button.
• If using the remote control, press the POWER ON button.
The projector will be turned on and display a message to the effect
that the projector is locked.
2. Press the MENU button.
3. Type in the correct keyword and press the ENTER button. The projector will display an image.
NOTE:
• The security disable mode is maintained until the main power is turned off or unplugging the power cable.
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3. Convenient Features