Soiled Edge On The Leading Edge And The Trailing Edge Of Paper Caused By Rubbing Against The Flapper On The Delivery Reverse Unit - Canon imagePRESS C10000VPSeries Troubleshooting Manual

Soiled edge on the leading edge and the trailing edge of paper
caused by rubbing against the flapper on the delivery reverse unit.
[Symptom]
A one-sided printing on the heavy paper with face-down delivery may cause soil, which is different from toner stain, on the leading
edge and trailing edge of the back side (non-printed side) of the paper.
[Cause]
When printing on one-sided heavy paper with face-down delivery, the leading edge and trailing edge of the paper rub strongly
against the flapper [a] in passing through the delivery reverse unit, which may result in the above-mentioned symptom.
One-sided and two-sided printing with face-up delivery does not cause the symptom.
[Service work]
Set the delivery operation to face-up delivery to output the image.
If the symptom does not improve, then check other factors.
52