Canon imageCLASS MF4370dn Basic Operation Manual page 58

When setting paper, gently insert the
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paper into the multi-purpose tray with
the print side up.
When setting an envelope, gently insert the
envelope into the multi-purpose tray with the
print side up and the right edge (i.e., closer to
the stamp) first.
When you load paper with a logo on, position the
paper with the print side up (logo side) and insert
it so that the top of the paper feeds first in the
multi-purpose tray.
Slide the paper guides so that they fit to
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both sides of the paper.
If the paper guides do not fit the size of the paper,
the print quality may be deteriorated.
Specify the size and the type of the paper
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you load.
For details on how to specify the paper size and
type, see "Setting Paper Size and Type, " on p. 2-
14.
Loading Paper
2-13