Circuit Protections; Fuse; Thermal Switch; Interlock Switch - Sanyo MS6A Service Manual

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 illuminated, 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 following to "Mechanical
Disassemblies".
2.
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 abnormally. 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.

Interlock switch

The interlock switch (SW904) cuts off the AC mains power supply
when the lamp cover is removed. After opening the lamp cover for
replacing the lamp ass'y, place the lamp cover correctly otherwise
the projector can not turn on.
Fuse
Reset Button
-6-
Line Filter Board
Thermal switch (SW902)