Fujitsu fi-7800 Operator's Manual page 27

Scanner Overview
2
Grab the ADF release tab and lift it up to open the ADF.
When you open the ADF with the power turned on, the LED comes on.
CAUTION
Do not look at the LED light source directly. Doing so may cause visual impairment.
Note that the amount of light from the LED light source that is exposed through the
scanner does not pose any risk of eye damage.
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