Smudge Marks Appear on the Edge of Printouts

Troubleshoot by checking in the following order:
Are You Using Appropriate Paper?
Check whether the paper in the machine is usable, and replace it with appropriate paper, as needed.
Usable Paper
Loading Paper
Set the paper size and type correctly according to the loaded paper. Specifying the Paper Size and Type
Are You Printing to the Edge of the Paper Without Margins?
This symptom may occur when the margin is set to none in the printer driver. To print with this machine, a margin of 5 mm (10 mm at the top and bottom of an envelope) is required.
On the [Printing preferences] screen of the printer driver, configure the following setting to provide a margin.
[Finishing] tab [Advanced Settings] [Expand Print Region and Print] [Off]
Have You Cleaned the Fixing Assembly?
These symptoms may occur when the fixing assembly is dirty. In this case, clean the fixing assembly. Cleaning the Fixing Assembly