Canon ImageCLASS MF7480 - Manual (Page 75)

Original and Paper
2‑8
If you are placing the original on the platen
glass, the size of the original is detected
after the feeder is closed. Make sure to
close the feeder before scanning.
Open the feeder and remove the original
from the platen glass when scanning is
complete.
The machine cannot detect the size of
STMT and STMTR originals that are placed
on the platen glass. After pressing (Start),
follow the instructions on the screen to
specify the original size. You can also
manually select the paper size.
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