Dell C1765NFW MFP Laser Printer - Manual (Page 217)

Loading Print Media 215
10 Insert the PSI into the printer and then align the PSI to the marking on the paper tray.
11 Select the paper type from the operator panel if any print media other than plain print media is loaded. If a
user-specified print media is loaded in the MPF, you must specify the paper size setting by using the operator
panel.
NOTE: For standard-size papers, adjust the guides first and then set papers.