NEC UM383WL User Manual page 104

3. Put the filter cover back to the projector cabinet.
Keep to push the filter cover frame around the buttons
until a "click" sound is heard. The filter cover will be
secured in position.
4. 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