NEC P474W - Page 117

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7. Maintenance
4. Mount the filter unit back onto the projector cabinet.
 Insertthelterunitontotheprojector.
5. Closetheltercover.
Keep to push the filter cover frame around the buttons until a
“click”soundisheard.Theltercoverwillbesecuredinposition.
6. Clearthelter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 84)
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.