Canon LV-7545U, Service Manual

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2.3 Interlock Switch
The interlock switch (SW902) 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.
2.4 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.
• 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)
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".
Part 2: Repair Information
2-3
Fig. 2-3
Interlock switch
Thermal switch