Dell 1815dn - All-in-one Laser Printer Owner's Manual page 41

Flex the sheets back and forth to loosen them, and then fan them out. Do not fold or crease the print
3
media. Align the edges on a level surface.
Insert the paper stack into the paper tray with the side to be printed on, facing down.
4
Do not exceed the maximum stack height indicated by the paper limit marks on the both inside walls
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of the tray.
NOTE:
Overloading the paper tray may cause paper jams.
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