C9800 MFP User’s Guide> 38
5.
Load the paper.
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For single-sided printing on letterhead, load the paper
into the multi-purpose tray with pre-printed side up
and top edge into the printer unit.
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For two-sided (duplex) printing on letterhead, load the
paper with pre-printed side down and top edge away
from the printer unit.
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Envelopes should be loaded face-up with long edge
into the printer. Do not select duplex printing on
envelopes.
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Do not leave space between the paper and the guides.
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Do not exceed the paper capacity of approximately 230
sheets, 100 transparencies or 25 envelopes. Maximum
stacking depth is 25mm.