Progressly the black print stopped printing.

[glenn33]

The printing or copying documents of black characters the print gradually became lighter. I ran the 'clean cartridge' numerious times, changes the Black ink cartridge using HP made cartridge. Quality report shows NO black ink present.

[sandytechy20]

@glenn33

Welcome to the HP Forums. I would be happy to help you with your HP Photosmart 7510 printer. I understand that it is not printing in black and you are getting print quality issue and you have already done some preliminary troubleshooting. 

Don't worry though as I have a few steps to determine the issue and find a solution as well,

• Check the paper.
• Check the print settings.
• Check the ink levels and replace any low or empty cartridges.
• Print and evaluate a Print Quality Diagnostic Report.
• Make sure that the cartridges are properly vented and seated correctly.
• Use an automated tool to clean the printhead.

Click here and follow the steps mentioned in the document to fix this issue.

Let me know how it goes.

Cheers.