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2.3 Lamp Cover Switch
The lamp cover switch (SW8801) cuts off the
drive signal to the lamp circuit when the lamp
cover is removed or no close completely. After
opening the lamp cover for replacing the lamp
ass’y, place the lamp cover correctly otherwise the
projector can not turn on.
2.4 Warning Temperature and Power Failure Protection
The 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 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 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
Lamp Cover Switch
Lamp Cover
Summary of Contents for LV-S3E/D78-5423
Page 2: ...CANON Multimedia Projector LV S3U D78 5422 LV S3E D78 5423 SERVICE SMANUAL ...
Page 9: ...Part 1 General Information ...
Page 24: ...Part 2 Repair Information ...
Page 42: ...Part 3 Adjustment ...
Page 59: ...Part 4 Troubleshooting ...
Page 73: ...Part 4 Troubleshooting 4 14 BA7078AF Sync Detector IC5301 BA9743AFV DC DC Converter IC371 ...
Page 74: ...Part 4 Troubleshooting 4 15 LM4865 Audio Amplifier IC5003 PW168A Scaler Main CPU IC301 ...
Page 76: ...Part 5 Parts Catalog ...
Page 77: ......
Page 93: ...Part 6 Electrical Diagrams ...