NEC NP-P350X - Manual (Page 163)

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7. Maintenance
7. Put the filter unit back to the projector cabinet.
Make sure that the filter unit is placed in the correct orienta-
tion.
8. Put the filter cover back to the projector cabinet.
Insert two catches of the top side of the filter cover into the
groove of the cabinet, and push the buttons on the left and right
to close the filter cover.
• 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 104 )
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