Oki C610dtn User Manual page 22

• For two-sided (duplex) printing on letterhead paper load
the paper with pre-printed side down and top edge away
from the printer. (Optional duplex unit must be installed for
this function.)
• Envelopes should be loaded face up with top edge to the
left and short edge into the printer. Do not select duplex
printing on envelopes.
• Do not exceed the paper capacity of about 100 sheets or
10 envelopes. Maximum stacking depth is 3/8-inch
(10 mm).
5. Press the tray latch button inwards to release the paper
platform, so that the paper is lifted and gripped in place.
6. Set the correct paper size for the multi purpose tray in the
Media Menu (see "Menu Functions" on page 23).
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– C610/C711 User's Guide