Question about HP OfficeJet 6210 All-In-One InkJet Printer

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Dark balck line down middle when copying, but not when printing

I know that the glass is clean

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If this happens only when you feed the original through the top feeder and not when you lay it on the glass, then you have a small bit of dirt at the scanning location--since the paper moves, rather than the scanning bar, the section of glass that is involved is very small and one little bit of dirt will make a line down the whole page. You need to lift the automatic document feeder mechanism and clean the glass strip under it--that's where your (unseen) dirt is. (Page 108 of the manual, if you have one.)

Posted on Feb 18, 2009

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Sounds like the scanner bar that moves under the glass is dirty or more likely damaged.

Posted on Dec 10, 2008

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