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Black color block is missing on 'Print Quality Diagnostic'

HP Recommended
HP 6520
Microsoft Windows 10 (64-bit)

The Print Quality Diagnostic goes not print any of the black block, yet the black text prints fine and the blocks have nice sharp black borders.  I have thoroughly cleaned the print heads.  Priming a simple text document produces a blank page.  Has HP put in some firmware to prevent printing using non HP Inks.   I am led  to believe this is the case - which is illegal in Europe as I understand things.  

Can HP advice me how to get this printer working with black ink - how can it be selectively printing black?

HP Support Agent
HP Support Agent
13,093 13,078 701 535
Message 2 of 2
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HP Recommended



Welcome to the HP Support Community.


Are you able to copy well in black?


Try the steps from here:


Let me know if this helps.


If the information I've provided was helpful, give us some reinforcement by clicking the Accepted Solution and Kudos buttons, that'll help us and others see that we've got the answers!




Have a great day!

I am an HP Employee

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