Printer not printing dark, it comes out gray instead of black?

I have a kodak all in one printer. When I print it comes out a light gray color and not black. I just replaced the black ink and it is still gray.

About a week ago it got a paper jam and we had to pull it our and there was black ink smudged all over it.

What could be the problem?
Update: Info about these things would be helpful.
Update 2: itstill prints color fine
Update 3: cleaning cycle?
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