Circuit Protections; Thermal Switch; Lamp Cover Switch; Fuse - Sanyo PLC-XU350A Service Manual

Circuit Protections

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

There is the thermal switch (SW90) inside of the projector to de-
tect the internal temperature rising abnormally. When the internal
temperature reaches near 100˚C, the thermal switch opens to stop
the operation of the power supply circuit.
The thermal switch can be reset itself automatically when the in-
ternal temperature becomes normal.
When the internal temperature reaches near 70˚C, the thermal
switch returns automatically.

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 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 7804
tYPe t6.3AH 250V FuSe
lIttle FuSe INc. tYPe 21506.3
or
Fuse Part No, : 423 034 4101
tYPe t6.3AH 250V FuSe
Hollyland co, ltd. tYPe 50ct063H
How to replace the fuse
1. The fuse is placed on the filter board under the main board. Re-
move the cabinet top and the main board.
. Take the fuse off, and replace the new one with the specified
type.
-5-
Thermal switch (SW90)
Lamp cover switch
(SW901)
Fuse