Oki C810 User Manual page 14

To prevent paper jams:
> Do not leave space between the paper and the guides and rear stopper.
> Do not overfill the paper tray. Capacity depends on the type of paper stock.
> Do not load damaged paper.
> Do not load paper of different sizes or types at the same time.
> Do not pull the paper tray out during printing (except as described above for the
2nd tray).
Close the paper tray gently.
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