Oki C9600n User Manual page 36

5. Load the paper.
> For single-sided printing on headed paper, load the
paper into the multi-purpose tray with pre-printed side
up and top edge into the printer.
> For two-sided (duplex) printing on headed paper, load
the paper with pre-printed side down and top edge
away from the printer. (The duplex unit must be
installed for this function.)
> Envelopes should be loaded face-up with long edge
into the printer. Do not select duplex printing on
envelopes.
> Do not leave space between the paper and the guides.
> Do not exceed the paper capacity of approximately 230
sheets, 100 transparencies or 25 envelopes. Maximum
stacking depth is 25mm.
C9600 User's Guide> 36