Oki C810 User Manual page 13

> IMPORTANT: Set paper size dial (3) to the size and orientation of
paper being used (A4 LEF in the above example).
> C810 only: GDI printers use the printer
settings defined by the host (PC).
If the paper is oriented long-edge, the Long
Edge Feed (LEF) checkbox must be enabled
in the printer driver.
If the paper is oriented short-edge, the
Long Edge Feed checkbox must be disabled
in the printer driver.
If the driver setting doesn't match the paper orientation, the printer
will display an error message indicating that a mismatch has
occurred.
5. If you have two trays and you are printing from the 1st (upper) tray, you can pull out
the 2nd (lower) tray during printing to reload it. However, if printing from the 2nd
(lower) tray, do not pull out the 1st (upper) tray. This will cause a paper jam.
If 3 trays are fitted this applies to trays 1 & 2 if printing from the 3rd (lower) tray.
6. For face down printing, make sure the face up (rear) stacker (3) is closed (the paper
exits from the top of the printer). Stacking capacity is approximately 250 sheets,
depending on paper weight.
7. For face up printing, make sure the face up (rear) stacker (3) is open and the paper
support (4) is extended. Paper is stacked in reverse order and tray capacity is
approximately 100 sheets, depending on paper weight.
8. Always use the face up (rear) stacker for heavy paper (card stock etc.).
Do not open or close the rear paper exit while printing as it may result
in a paper jam.
CAUTION!
CAUTION!
Loading paper > 13