NEC PE523X User Manual page 123

5. Close the filter cover.
Keep to push the filter cover frame around the buttons until
a "click" sound is heard. The filter cover will be secured in
position.
This completes the filter replacement.
Go on to the clearing lamp and filter hour meters.
To clear the lamp usage hours and the filter usage hours:
1. Place the projector where you use it.
2. Plug the power cord into the wall outlet, and then turn on the projector.
3. Clear the lamp usage hours and the filter usage hours.
1. From the menu, select [RESET] → [CLEAR LAMP HOURS] and reset the lamp usage hours.
2. Select [CLEAR FILTER HOURS] and reset the filter usage hours. (→ page 84)
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7. Maintenance