My HP 7510 printer will not print black properly even though the ink is full


I am facing this problem Since I replaced the printer’s ink with new cartridges about a month. it comes out unclear as if the ink had not been changed. when I check the ink it says it is full but cyan is getting low. Black is pretty full. The only one not replaced is the photo black as I don’t use it. IT asks me if the cartridge of the photo ink is used or counterfeit. it is used but this has not been a problem before I never changed the photo ink after it first was used up as I didn’t’ want to waste expensive ink. I don’t know any of the regular inks can be low as they were all replaced at the same time and not used much.

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