NEC PA500U User Manual page 45

7. Use the  button to move the projected image frame as shown on the example.
8. Press the ENTER button.
9. Use the  button to select another icon which points in the direction.
On the Cornerstone adjustment screen, select [EXIT] or press the EXIT button on the remote control.
The confirmation screen is displayed.
10. Press the  or  button to highlight the [OK] and press the ENTER button.
This completes the Cornerstone correction.
Selecting [CANCEL] will return to the adjustment screen without saving changes (Step 3).
Selecting [RESET] will return to the factory default.
Selecting [UNDO] will exit without saving changes.
NOTE: To reset the 3D Reform correction setting values, press and hold the 3D REFORM button for a minimum of 2 seconds.
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3. Convenient Features