Following up with this issue. Our organization just bought few 6515's and one of them just printed pages with grey backgroud on it, same as the OP. One page has full page grey tone on top of the actual document while other pages; while other pages only printed with partial page grey tone on it. Please let me know what would be the possible cause and troubleshooting steps to mitigate this issue.
My comment was meant to imply that dirt in the machine can cause static and xerographic anomalies could occur that would print the background.
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The greyness in the background is no smudge or dirt, it is smooth as if it was meant to be a fill-up or highlighting of a paragraph. The problem is usually triggered when highlighting or fill-up occurs in a document that is being printed. In such a case the following page that is printed also shows the grey background.
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Intermittent background can often be a symptom of dirt or contamination inside the machine.
I would suggest that you review the following solution for.
Background Contamination There are a few steps that may help.
If that does not resolve your issue you may consider contacting our specific product support experts at the following link:Fast Track to the Expert
My Workcentre 6015 randomly prints a grey background on some pages. Sometimes It is just a part of the page or a few lines, sometimes it is the complete page. There is no lack of toner in the cartridges. Could anyone advise on how to solve this annoying problem? Thank you.