Fuse; Thermal Switch; Lamp Cover Switch; Circuit Protections - Canon LV-S4 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.
● Fuse
A fuse is located inside of the projector. When the POWER indica-
tor is not lightning, the fuse may be opened. Check the fuse as fol-
lowing steps.
The fuse should be used with the following type;
Fuse Part No.: 423 022 2102
TYPE T4.0AH 250V FUSE
LITTEL FUSE INC. TYPE 215004
How to replace the fuse
1.
Remove the cabinet top following to "Mechanical
Disassemblies".
2.
Remove the cover on the Filter Board.
3.
Remove 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 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 with a sharp-
pointed tool.
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 (SW8801) cuts off the drive signal to the
lamp circuit when the lamp cover is removed or no close com-
pletely. After opening the lamp cover for replacing the lamp ass'y,
place the lamp cover correctly otherwise the projector can not
turn on.
* Following information differs from the model LV-S3 ;
- the cabinet

Fuse

Lamp Cover
-5-
Filter Board

Thermal Switch

Lamp Cover Switch