Canon D78-5252, Service Manual

Page: 29 / 73

Part 2: Repair Information
2-4
3. CIRCUIT PROTECTIONS
This projector is equipped with the following circuit protections.
3.1 Fuse
A fuse is attached to the power supply.
When the LAMP indicator or the READY
indicator is illuminated, the fuse is normal.
Check the fuse as follows:
1. Remove the power supply unit according
to the servicing procedure.
2. Remove the fuse and check it with a
multimeter.
3.2 Temperature Protection equipment
To protect circuitry and optical components from abnormal rise of the internal
temperature, the following temperature
protections are provided:
1) Thermal Sensor Circuit
If the internal temperature of the projector
rises excessively, the WARNING TEMP.
indicator flashes and the cooling fan starts to
run to cool the projector. When the
temperature becomes normal, the indicator
stops flashing. If it does not stop, unplug the
AC cord from the outlet and check and clean
the air filter. If the indicator still flashes,
inspect the inside (cooling fan, etc.) of the
projector.
Fuse 250V 6.3A AA
Part No. DY4-5918-000
The specified fuse should
be used. Using an
unspecified fuse may cause
fire or electric shock.
CAUTION
Fig. 2-2
Fig. 2-3
Fuse
Power supply unit
Reset button
Thermal switch
(SW902)