I have a HP L7580 all in one printer. When ever I copy a page I get two black lines down the page. Why?

You say that when you COPY, it leaves lines. I'm going to assume the lines don't appear when you print normally.

If that's the case, I can imagine two causes. Both of them are in the scanning side, so print cleaning won't help.

The first is a failure on a couple of your scanner pixels. Those pixels aren't reading anything, so they're returning no signal - i.e. a black line. That would cause one or more black lines that don't quite extend from top to bottom on your paper (due to the margins), but are very narrow and very straight. This would occur whether you scan the document via the document feeder or flat panel. There's little you can do to fix that.

If the scan works properly from the flat panel, but not the feeder, there's something blocking portions of the scanning surface in the document feeder. That might be something that you can clean out (it could be just a speck of dust in the wrong place).