Sanyo PLC-EF12B, Service Manual

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Circuit Protections
Warning temperature and power failure protection
The TEMP WARNING indicator flashes red and the projector will automatically turn off when the internal tempera-
ture of the projector exceeds the normal temperature or when stopping cooling fans or when the internal power sup-
ply 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)
If the TEMP WARNING indicator still continues to flash, there may be defects on cooling fans or power supply cir-
cuits. Please check fan operation and power supply lines referring to the “Power Supply Lines Chart”.
Air Filter care and cleaning
The removable air filter prevents dust from accumulation on the surface of
the projection lens and projection mirror. Should be 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 filter, follow the cleaning procedure below:
1. Turn the MAINS ON/OFF switch to OFF, and disconnect the AC power
code from the AC outlet.
2. Remove the air filter cover.
Press the cover latch sideway and lift the cover.
3. Remove the air filter and sponge from the filter cover.
4. Clean the air filter with a vacuum cleaner.
5. Replace the air filter and sponge. Make sure that air filter cover is fully
inserted.
CAUTION:
Do not clean with water. Doing so may damage the air filter.
Do not operate the projector with air filter removed.
RECOMMENDATION
We recommend to avoid dusty, smoky place for operating the projector.
Using in dusty place may cause the picture of poor quality.
When using under the dusty or smoky conditions, dust may accumulate on
the LCD panel and lens inside it, and may resultantly be projected on the
screen together with the picture.
When the above symptoms are noticed, please clean up the LCD panel
and lens following to the “Cleaning Method”.
Air filter cover
Air filter cover
Sponge
Air filter