Troubleshooting
Toner Smudges Appear on the Back of the Page
Probable Causes
The media transfer roller is dirty.
The media path is dirty with toner.
Foreign material has entered the printer.
One or more of the imaging units may be defective.
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WorkCentre 6400 Multifunction Printer
User Guide
Solutions
Check the transfer roller for toner accumulation.
Replace if necessary.
Print several blank sheets and the excess toner should
disappear.
Check the transfer belt for foreign material or
damage.
Check the fuser for foreign material.
Remove the imaging units one at a time, and check
for damage. If it is damaged, replace it.