Cyan not printing on Smart Tank Plus 551

[JimParkerJP]

My one-year old HP Smart Tank Plus 551 will no longer print cyan. All three color tanks are about half full.  I have generated a Print Quality Diagnostic Page and the left-hand Test Pattern 2 does not print at all (no C, M, or Y blocks). I have also done all three levels of printhead cleaning using the HP Smart app on my Windows 10 computer. I have replicated the problem from three Windows 10 computers, a MacBook Air,  and an iPhone 8--all on standard white paper. Black prints fine. 

Any assistance would be greatly appreciated.

[Rainbow23]

Hi @JimParkerJP,
Welcome to HP Support Community. This is a great place to post questions and find answers.
Thank you for posting your query, I will be glad to help you.

I see that you are facing print quality issues with your HP Smart Tank Plus 551 Wireless All-In-One.

Please follow the steps from this document.

Let me know if this helps and have a nice day ahead.

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

[JimParkerJP]

Hi @rainbow23,

Yes, I have performed all of the steps in the document you referenced up until replacing the printhead. None of the steps resolved the cyan printing problem.

Jim