Lexmark C3426
Remove the tray.
Remove the used manual feeder.
Unpack the new manual feeder.
Insert the new manual feeder.
Insert the tray.
Remove paper that is stuck in the manual feeder to continue printing.
Lexmark CS/CXx31 ¬Entity C/MC3xxx: Paper Jams when Inserting any Type of Media Through Manual Feeder During Printing