NEC NP-PA550W User Manual page 169

8. Put the filter cover back to the projector cabinet.
Insert the 4 catches on the top of the filter cover into the grooves
in the projector, then press the left and right buttons to close.
• Push the filter cover until it clicks into place.
9. 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].
(→ page 117)
The interval time to clean the filters is set to [OFF] at time of
shipment. When using the projector as it is, you do not clear
the filter usage
157
7. Maintenance
Catch
Button