This likely means a faint ghost of the main printout at a distance equal to
the circumference of one of the rollers or photosensitive drum.
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Depending on where the problem originates, this could be a bad wiper
(cleaning) blade, faulty corona, or incomplete fusing.
It is easy to determine where the problem is located: Interrupt a printout
in mid-stride (where part of the paper is between the toner/developer and
fuser. If the un-fused image has ghosting, it is a fault in the area of the
drum. Also see the section: Previous copy doesn't erase