Dell 3110CN Owner's Manual page 23

NOTE:
When loading user-specified print media, adjust the width guides and slide the extendable part of
the tray by squeezing the length guide and sliding it until it rests lightly against the edge of the stack of
paper.
Insert the tray into the printer, and push until it stops.
7.
Select the paper type from the operator panel if any print media other than plain print media
8.
is loaded. If a user-specified print media is loaded, you must specify the paper size setting by
using the operator panel.
23
Loading Paper