Circuit Protections; Fuse; Thermal Switch - Sanyo M4G-3000 Service Manual

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Circuit Protections

This projector is equipped with the following circuit protections to operate in safety. If the abnormality occurs inside
the projector, it will automatically turn off by operating one of the following protection circuits.

Fuse

The fuse is located inside of the projector. When either the LAMP indicator or the READY indicator is not illuminat-
ed, fuse may be opened. Check the fuse as following steps.
It should be used the specified fuse as follows;
Fuse Part No.: 423 022 2102
TYPE T4.0AH 250V FUSE
LITTLE FUSE INC. TYPE 215004
How to replace the fuse
1. Remove the cabinet top and main board following to
"Mechanical Disassemblies".
2. Remove a screw and the line filter cover upward.
3. Remove the fuse from fuse holder.
To install the fuse, take reversed step in the above.

Thermal switch

There is the thermal switch (SW902) inside of the projector to prevent the internal temperature from rising abnor-
mally. When the internal temperature reaches near 100˚C, turn off the AC main power supply automatically.
The thermal switch is not reset to normal automatically even if the internal temperature becomes normal. Reset the
thermal switch following procedure.
Check the resistance between terminals of thermal switch by using the tester. If it has high impedance, thermal
switch may be in operative.
How to reset the thermal switch
1. Remove the cabinet top following to "Mechanical
Disassemblies".
2. Press the reset button on the thermal switch.
CAUTION:
Before press the reset button, disconnect the AC cord from
the projector.
Screw
Fuse
Reset Button
-6-
Line Filter Cover
Line Filter Board
Thermal switch (SW902)