black lines on copies

[mchadcarter]

I have a imageCLASS d550 and when making copies a black line prints on all copies even when i change toner

[plip]

I get the same thing, but ONLY when using the document feeder. I get no line when placing the document on the glass.

[awade]

We are having the same problem when using the document feeder - getting a thin black line on every copy. What can we do to fix this?