HP LaserJet 1100 - "negative ghost" images

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I've got an HP LaserJet 1100 and I'm getting "negative" ghost images. What
happens is that if there's some grey on the bottom of a page, it will have a
negative image of whatever text or graphic was printed in black earlier on
the page. The spacing between the original and the negative is exactly 3".

I've read a lot about *positive* ghosts, stemming from problems with toner
staying on the fuser roller. What could cause these *negative* ghosts, and
how do I fix it?