Xerox WorkCentre PE120-120i-3124 - Manual (Page 34)

Getting Started 2.8
4 Pay attention to the paper limit mark on both inside walls of
the tray. Paper overloading may cause paper jams.
5 Insert and slide the paper tray back into the machine.
N OTE : After you load paper, you need to set up your machine for
the paper type and size you loaded. See page 2.21 for copying and
faxing, or page 4.6 for PC-printing. The settings made from the
printer driver override the settings on the control panel.