This indicates an original misfeed has occurred in the ADF.
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This indicator will only be displayed when the machine is equipped with the ADF.

Preventing original misfeeds
Use the exposure glass for the following kinds of originals.
Heavier than 128 g/m2 (34 lb.)
Lighter than 52 g/m2 (14 lb.)
Smaller than 148 × 210 mm (5.9 × 8.3 inches)
Larger than 297 × 864 mm (11.6 × 34.0 inches)
Stapled or clipped
Perforated or torn
Curled, folded, or creased
Coated, such as thermal fax paper, art paper, aluminum foil, carbon paper, or conductive paper
Bound, such as a book
Damaged
With glue on them
Pasted
Written in pencil
Thin and flimsy
With index tabs
Transparent, such as OHP transparencies or translucent paper
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You cannot place originals of different sizes together.
Remove staples or clips from originals, and then fan the originals lightly.
Do not stack originals above the limit mark.