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HP Smart Tank 7605 All-in-One
Microsoft Windows 10 (64-bit)

Smart Tank 7600. I haven't had it that long and rarely print colour. Needed to recently and blue isn't printing at all. Running clean printheads programme a few times hasn't helped. Neither has cleaning the printhead contacts with de-ionised water. But as you can see from this section of the print diagnostic page, the blue is entirely missing. I've hardly used colour and the tanks are full so it's not an empty tank. so is it something to do with the tube going into the printhead? Somewhere else?

 

What do I do next? Is there a way of checking the tubes or blowing through? I saw this https://www.youtube.com/watch?v=jXhtJ4eFdaI but thought I'd better not try it without asking here if there's something else I should try.

 

By the way, are red and yellow and black OK? Each square is paler on the right than the left. Looking at help pages, I think that may be how it should look but thought I'd better check here too.

 

Thanks.Print quality diagnostic.jpg

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