Press [Original Settng].
Press [Original Size].
Specify the original size, and then press [OK].
Select original orientation.
Press [OK].
Press [Create Margin].
Select the reproduction ratio, if necessary.
Select the paper tray.
Place the originals, and then press [Start].
You can change the ratio for Create Margin under [Reproduction Ratio] in User Tools. For details, see Reproduction Ratio.