Lexmark M5100 SERIES User Manual page 62

Using M5155 and M5163 62
One‑sided printing Two‑sided printing
Note: If the holes on the long edge of the paper are on the left side of the tray, then a jam may occur.
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Make sure the paper is below the maximum paper fill indicator.
Warning—Potential Damage: Overfilling the tray can cause paper jams.
5
Insert the tray.
Note: Press the paper stack down while inserting the tray.