NEC PE523X User Manual page 117

4. Mount the filter unit back onto the projector cabinet.
Insert the filter unit onto the projector.
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.
6. Clear the filter usage hours.
Plug the power cord into the wall outlet, and then turn on the
projector.
From the menu, select [RESET] → [CLEAR FILTER HOURS].
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7. Maintenance