NEC NC900C User Manual page 59

5-3-5. Replacing the Rear Air Filter
Preparation: Replace the lamp first. (See page 54)
1
Open the filter cover.
1. Loosen each of the two knobs by turning them counterclockwise.
The knobs are not removable. If the knob is too tight to turn, use a Phillips screwdriver.
2. Tilt the filter cover towards you to open it.
5. Maintenance of Your Projector
59