- 6 -Safety Protections3. Mechanical switchesThere are some mechanical switches inside of the projector to detect that the covers, filters or lamps are mountedcorrectly. When one of following switches detects an error (open), the projector cannot turn on.This projector provides 4 mechanical switches and 4 lamp selection switches as follows;- Lamp1 cover switch (SW902)- Lamp2 cover switch (SW905)- Bottom cover switch (SW904)- Air filter switch (SW903)- Lamp selection switches (SW906, SW907, SW908, SW909)LED indication on the ErrorFILTER LED blinking SW903 openLAMP1/LAMP2REPLACE LED blinking SW902 or S905 openSW903SW904SW908SW909SW906SW907SW902SW905
