vertical lines when copying through document feeder on 8625

[MarkLev]

When I scan or copy via the document feeder on the 8625, I get a series of black vertical lines down the middle of the page. This doesn't happen when i scan directly from the flatbed, nor when I print directly from a file on my computer.  This looks like a sw problem rather than a hw problem. I've cleaned the heads that draw the paper in.  I tried the HP troubleshooter, updating drivers (which shouldn't be an issue anyway if it's on the printer, not the PC), turning everything on/off, etc.

Any guidance would be greatly appreciated.

[Repairatrooper · Accepted solution]

Most times lines only on ADF copies are caused by contamination on the glass. Lift the ADF lid and to the left of the main glass you should see a small it of glass. Clean this carefully and try another copy. You can always make a copy of blank paper and then line up e bad copy with the glass to locate debris. Keep in mind that even material like a speck of adhesive from a post it note is enough to cause issues. 

[MarkLev]

This solved the problem. Thank you very much for your help.