These are some guidelines for cleaning the filter on the Hitachi CPX-206 Projector that is mounted with Smartboards in many Educate LLC school.


You will find the filter cover on the side of the projector:


Remove the filter cover by pressing down on the clips holding it in as shown below:


Below is a picture of the filter.  You can blow out the dust from the filter.  If you take the filter pieces apart, remember how to put them back together.


Once you have cleaned the filter, reset the filter timer in the projector.  When you hit the menu button on the projector, you will see the "Filter Time" menu choice near the bottom of the menu.