Cleaning the Dust Filters The dust filters catch dust and other particles in the air. If the filters become clogged, the projector does not cool properly and may malfunction. 1 Turn off the projector and unplug the power cord. 2 Turn the projector upside down and remove the screws on the filter doors. 3 Remove the filter doors and clean them using a vacuum cleaner on low power. 4 Replace the filter doors and tighten the screws. 29 ...