NEC NP-PH1400U User Manual page 201

4. Put the filter back into place.
Insert the filter with "↓ AIR FLOW ↓" facing the projector.
(1)Insert the filter in the inlet.
(2) Fit the top edge of the filter in the inlet.
5. Place the filter cover back into the projector cabinet.
(1)Align the knob (screw) with the screw hole.
(2)Tighten each of the two knobs by turning it clockwise.
6. Clear the filter usage hours.
Plug the power cord into the wall outlet, turn on the main
power switch, and then turn on the projector.
From the menu, select [RESET] → [CLEAR FILTER HOURS]
and reset the filter usage hours. (→ page 143)
Filter cover
187
7. Maintenance
Filter
1
2
Screw hole