Turn off the printer.
Remove all the trays.
Open door C.
Open door D.
Locate the rollers.
Remove the rollers.
Insert the new rollers until they click into place.
Note: Make sure to insert the rollers to their proper places.
Close doors D and C.
Insert the trays, and then turn on the printer.
Change the ADF pick and feed rollers regularly to prevent paper jam.
Change the ADF separator roller regularly to prevent paper jam.