-6-Circuit ProtectionsMechanical sensor switches (SW901, SW1891)This projector provides mechanical sensor switches, the one is for filter car-tridge switch (SW1891) and the other one is for lamp cover switch (SW901).The filter cartridge switch detects whether the filter cartridge is installed cor-rectly. If the filter cartridge is not installed correctly, the projector cannot turnon. In this case, the LAMP indicator is lighting and other indicators are blink-ing.The lamp cover switch detects whether the lamp cover is closed securely. Iflamp cover is opened or not closed completely, the drive signal to the lampcircuit is cut off. After opening the lamp cover for replacing the lamp ass’y,place the lamp cover correctly otherwise the projector cannot turn on. In thiscase, the LAMP indicator is lighting and LAMP REPLACE indicator is blink-ing.Filter cartridge switch(SW1891)Lamp cover switch(SW901)Filter cartridgeLed indicators
