Maintenance/replacementBefore performing maintenance/replacementf Make sure to turn off the power before maintaining the projector or replacing the unit.f When switching off the projector, make sure to follow the procedures in “Switching off the Projector”. (Æ page 39)MaintenanceOuter caseWipe off dirt and dust with a soft, dry cloth.f If the dirt is persistent, soak the cloth with water and wring it thoroughly before wiping. Dry off the projector witha dry cloth.f Do not use benzene, thinner, or rubbing alcohol, other solvents, or household cleaners. Doing so may deterioratethe outer case.f When using chemically treated dust cloths, follow the instructions written on its packaging.Lens front surfaceWipe off dirt and dust from the front surface of the lens with a soft clean cloth.f Do not use a cloth that is fluffy, dusty, or soaked with oil/water.f Since the lens is fragile, do not use excessive force when wiping the lens.Attentionf The lens is made of glass. Impacts or excessive force when wiping may scratch its surface. Handle with care.Air filter unitThis section describes the maintenance of the air filter unit that is installed as standard on the projector.The air filter unit is the same as the optional Replacement Filter Unit (Model No.: ET-RFV410).In the following cases, remove the air filter unit and check the clogging condition of the air filter. If the air filter isclogged, clean the air filter unit.f A temperature warning message is displayed on the projection screen.f The temperature indicator lights in red in the projection state.f The temperature indicator blinks in red in the standby state.f The message of “FILTER COUNTER has reached the set time.” that prompts to perform maintenance of the airfilter unit is displayed on the projection screen.Attentionf Make sure to turn off the power before performing maintenance of the air filter. (Æ pages 35, 39)f Make sure that the projector is stable, and perform the maintenance in a safe place even if the filter falls accidentally.Notef Check the usage time of the air filter in the [PROJECTOR SETUP] menu → [FILTER COUNTER].f Air filter replacement is recommended after washing the air filter two times for recycling.f The air filter performance after washing may be reduced compared with its initial performance.f The time until the air filter is clogged varies greatly depending on the usage environment.Removing the air filter unitTabsAir filter coverTabAir filter unitFig. 1 Fig. 2108 - ENGLISHChapter 6 Maintenance - Maintenance/replacement