Blue header on my HP Photosmart 7520 does not function completely

[Bangle3]

my blue in prints stripes and does not mix with the other colors when required.  I figure I have to replace the blue head...If wrong I need help and advice.  If right I need instructions.  

Help Please

Bob 

[The_Fossette]

Hi @Bangle3

Welcome to the HP Forums!

It is a great way to engage, post questions and find resolutions by working with specialists in the HP community.

I reviewed your post and I understand that you are having print quality issues.

I’d love to help!

In order that I may provide you with an accurate solution, I will need a few more details and I would appreciate if you could, perhaps elaborate on your concern.

·         When was the last time the printer was working fine?

·         Have you made any software or hardware changes on the computer?

·         Have you performed any troubleshooting steps before posting?

Follow the steps in the below article and check if it helps.

http://hp.care/2rjVXS8

Let me know how it goes and you have a good day ahead.

Take care!

Cheers!