Printing Results Are Not Good

Paper curls or creases.
	"Paper Curls" "Paper Creases"
Unevenness or smudge marks appears.
	"Printing Is Uneven" "Vertical Streaks Appear on the Output" "Smudge Marks of Spattering Toner Appear around the Text or Patterns" "White Specks Appear" "The Toner Adheres to the Hand" "The Overall Print Result Is Dark" "The Bottom Edge of Paper or Following Paper Has Smudge Marks"
Printout is missing or has unneeded space.
	"A Portion of the Page Is Not Printed"
Others
	"Printed Bar Codes Cannot Be Scanned" "Paper Jams Occur Frequently When Performing 2-Sided Printing (MF4890dw/MF4870dn/MF4820d Only)"

NOTE
To contact your local authorized Canon dealer: When a problem occurs that is not suggested in the e-Manual, or a problem persists if you follow the instructions, or you cannot determine the nature of the problem, contact your local authorized Canon dealer.