SERVICE MANUAL LC-XB41 - TechEdu.com

Circuit Protections
Warning temperature and power failure protection
The projector will be automatically turned off when the internal temperature of the projector is abnormally high, or the
cooling fans stop spinning, or the power supplies in the projector are failed.
- If the WARNING indicator is flashing, it may detect the abnormal temperature inside the projector. Check the following
possible causes and wait until the WARNING indicator stops flashing, and then try to turn on the projector.
- If the WARNING indicator lights red, it may defect the cooling fans or power supply circuits. Check fans operation
and power supply lines referring to the chapter “Power supply & protection circuit” in the Chassis Block Diagram
section.
Possible causes
- Air filters are clogged with dust particles. Remove dust from the air filters 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)
The projector is shut down and the WARNING
indicator lights red.
When the projector detects an abnormal condition, it is automatically
shut down to protect the inside of the projector and
the WARNING indicator lights red. In this case, unplug the
AC power cord and reconnect it, and then turn the projector
on once again to verify operation. If the projector cannot be
turned on and the WARNING indicator still lights red, it may
defect the cooling fans or power supply circuits.
Top Control
WARNING
lights red
CAUTION
DO NOT LEAVE THE PROJECTOR WITH THE AC
POWER CORD CONNECTED UNDER AN AB-
NORMAL CONDITION. IT MAY RESULT IN FIRE
OR ELECTRIC SHOCK.
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