Canon LV-5200U, Service Manual, Page: 27 / 126

2. 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.
2.1 Fuse
The fuse is located inside of the projector. When
either the LAMP indicator or the READY indicator is
not illuminated, a fuse may be opened. Check the
fuse according to the following steps. The specified
fuse should be used as follows;
[How to replace the fuse]
1. Remove the cabinet top and main board according
to step 1 of "Service (Mechanical Disassembles)".
2. Remove the fuse from fuse holder.
To install the fuse, take reversed step in the above.
2.2 Thermal Switch
When the internal temperature of the projector
reaches near 100 ˚C, the thermal switch (SW902)
turns off the AC main power supply automatically.
(Check the resistance between the terminals of the
thermal switch by using a tester. If it is open, the
thermal switch may be in operative.)
Reset the thermal switch according to the following
procedure.
[How to reset the thermal switch]
1. Remove the cabinet top according to step 1 of
"Service (Mechanical Disassembles)".
2. Press the reset button on the thermal switch.
2.3 Interlock Switch
The interlock switch (SW904) cuts AC power when
the lamp cover is removed. If the lamp cover is
opened to replace the lamp, the projector does not
start. Reinstall the lamp cover.
Fuse Part No. CY2-8376-000
Part 2: Repair Information
2-2
Fig. 2-1
Fig. 2-2
CAUTION
Before pressing the reset
button, disconnect the AC cord
from the projector.
Fuse
Line Filter Board
Thermal switch (SW902)
Reset Button
Fig. 2-3