Press [Original Settng].
Press [LT/LG Mixed Sizes], and then press [OK].
Select a paper tray that contains either 81/2 × 11 or 81/2 × 14 size paper.
Place the originals in the ADF, and then press [Start].
When using this function with 1 Sided 2 Sided mode, always ensure that the originals of each size are in even numbers. If you have an odd number of originals, insert blank sheets to adjust the total.