Smudge Marks Appear on the Back Side of Printouts

Troubleshoot by checking in the following order:
Are You Using Paper That Is Smaller Than the Size of the Print Data?
Replace with paper that is the same size as the print data. Loading Paper
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
A19S-0CA