Canon D78-5132, Service Manual

Page: 37 / 134

2.3 Warning Temperature and Power Failure Protection
The TEMP WARNING indicator flashes red and the projector will automatically turn off
when the internal temperature of the projector exceeds the normal temperature or when
stopping cooling fans or when the internal power supply lines are failed.
Check the following possible causes and wait until stopping the TEMP WARNING
indicator flashing.
Possible causes
• Air filter is clogged with dust particles. Remove dust from the air filter by following
instructions in the “Air filter care and cleaning” below.
• Ventilation slots of the projector are blocked. In such an event, reposition the
projector so that ventilation slots are not obstructed.
• Check if projector is used at higher temperature place (Normal operating temperature
is 5 to 35 ˚C or 41 to 95 ˚F)
If the TEMP WARNING indicator still continues to flash, there may be defects on
cooling fans or power supply circuits. Please check fan operation and power supply lines
referring to the “Power Supply Lines Chart”.
2.4 Air Filter Care and Cleaning
The removable air filters prevents dust from
accumulation on the surface of the projection
lens and projection mirror. Should the air
filter become clogged with dust particles, it will
reduce the cooling fan’s effectiveness and may
result in internal heat build up and reduce the
life of the projector.
To clean up the air filters, follow the cleaning
procedure below:
1. Turn the power off, and disconnect the AC
power cord from the AC outlet.
2. Turn the projector up side down and
remove 2 air filters (Large and Small) by
pulling the latches of them upward.
3. Clean the air filters with brush or wash out
the dust and particles.
4. Replace each air filter properly. Make sure
that the air filters are fully inserted.
Part 2: Repair Information
2-3
Fig. 2-3
Air filters
(Small)
Air filters
(Large)