-5-Lamp cover switchThe lamp cover switch (SW902) cuts off the drive signal to the lampcircuit when the lamp cover is removed or not closed completely.After opening the lamp cover for replacing the lamp ass’y, place thelamp cover correctly otherwise the projector can not turn on.Thermal switchThere is the thermal switch (SW601) inside of the projector to de-tect the internal temperature rising abnormally. When the internaltemperature reaches near 85˚C, the thermal switch opens to stopthe operation of the power supply circuit.When the internal temperature reaches near 55˚C, the thermalswitch returns automatically.This projector provides the following circuit protections to operate in safety. If the abnormality occurs inside the pro-jector, it will automatically turn off by operating one of the following protection circuits.Thermal switch (SW601)FuseCircuit ProtectionsFuseA fuse is located inside of the projector. When the POWER indica-tor is not lighting, the fuse may be opened. Check the fuse as fol-lowing steps.The fuse should be used with the following type;Fuse Part No.: 323 021 7804tYPe t6.3AH 250V FuSeLIttLe FuSe INC. tYPe 21506.3orFuse Part No, : 423 034 4101tYPe t6.3AH 250V FuSeHollyland Co, Ltd. tYPe 50Ct063HHow to replace the fuse1. The fuse is placed on the power board. Remove the cabinet top ,main board, optical engine and the fan (FN001).2. Take the fuse off, and replace the new one with the specified type.Lamp cover switch(SW902)