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Circuit Protections
This projector provides the following circuit protections to operate in safety. If the abnormality occurs inside the projec-
tor, it will automatically turn off by operating one of the following protection circuits.
Thermal switch
There is the thermal switch (SW902) inside of the projector to detect
the internal temperature rising abnormally. When the internal tem-
perature reaches near 105˚C, the thermal switch opens to stop the
operation of the power supply circuit.
The thermal switch cannot be reset itself automatically even if the
internal temperature becomes normal. Reset the thermal switch fol-
lowing to the below procedure.
How to reset the thermal switch
1. Remove the cabinet top, cabinet front and main board and then
remove the power box top cover.
2. Press the reset button on the thermal switch in the power box.
CAUTION:
Before press the reset button, make sure that the AC cord must be
disconnected from the AC outlet.
Lamp cover switch
The lamp cover switch (SW901) cuts off the drive signal to the lamp
circuit when the lamp cover is removed or not closed completely.
After opening the lamp cover for replacing the lamp ass'y, place the
lamp cover correctly otherwise the projector can not turn on.
Fuse
A fuse is located inside of the projector. When the POWER indicator
is not lightning, the fuse may be opened. Check the fuse as follow-
ing steps.
The fuse should be used with the following type;
Fuse Part No.: 423 021 7801
TYPE T6.3AH 250V FUSE
LITTLE FUSE INC. TYPE 21506.3
How to replace the fuse
1. Remove the lamp cover and fuse cover as shown in figure.
2. Take the fuse out from the aperture, and replace the new one with
the specified type.
Fuse
-5-
Thermal switch (SW902)
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