If you see
ink on the back of a printout, you can clean the paper guide
rollers to remove any excess ink.
If printouts are smeared or scuffed, load plain paper in
the cassette in this size: Letter
(8.5 × 11 inches [216 × 279 mm]) or
A4 (8.3 × 11.7 inches
[210 × 297 mm]).
Select Maintenance. You see a screen like
this:
Scroll down and select Paper
Guide Cleaning.
Follow the on-screen instructions to clean the paper
guide.
Repeat these steps as necessary until the paper comes out
clean.