I'm trying to fix a problem with an HP All-in-one inkjet printer. It might look like the ink should be replaced, but a new ink cartridge doesn't make a difference. The ink levels of the old cartridge seem OK as well. The colors work well and don't have this problem. It's black only that has a problem. I used the HP software to clean the heads, but that doesn't make a difference.
Could this be the black head having a problem? What can I do to fix this?
What you see is scan of a small part of a print. The blackness stays the same over horizontal lines. For most of the page, black text is pale grey.