Please take a look at this article for image quality issues that will have steps to try and fix the problem. If after trying these steps you still have the image quality issue please call into the support department for more assistance @ 1-800-821-2797.
Thanks, TammyL-Xerox Community Manager
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I've had no problem printing with the Versalink C600 until today, when it started ghosting print. When it's on plain white paper, it's OK, but then I transfer to slightly thicker paper - used 100s of times before - and the printing is repeated faintly in the second half of the page.