Canon LV-7105E/D78-5133 - Manual (Page 38)

Part 2: Repair Information
2-4
CAUTION
Do not operate the projector with the air filter removed. The dust is
stuck on the LCD panel and the mirror, and it may spoil the fine
picture image.
Do not put the small parts into the air filter intake vents. It result in
the malfunction of the projector. The air filter is small parts. Take care
that children don’t eat or swallow it.
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”.