I ran an unclogged job today and the pattern is perfect i.e. no broken lines. For good measure, I also ran a series nozzle checks using the Epson utility but as you can see the Photo blacks have progressively disappeared. I am attaching relevant prints for your perusal.
Interested to hear what your conclusion is and what steps I should take.
Bill

Ye, I think that could be the problem. I shall replace the ink and let you know how i get on.

This is a relatively new printer. Whilst I print on a regular basis, I would consider myself a low volume user.

I had just changed over from matt to photo black printing. And as I was about to run a test print for an ICC profile, I decide to run a nozzle check in advance as advised by the photo paper supplier. That's when I noticed the broken lines on the photo black pattern.

My ink supplier advised me to prime the cartridge and do a head clean which I did and I got the all clear, so I'm good to go.

A question for you. I thought that broken lines would show up routinely in unclogged print outs and that nozzle checks would become superfluous; obviously not. Am I right in assuming that the purpose of running unclogged routines is to keep the printer ticking over and thus avoiding clogged printer heads?

Bill

Thanks, Mike. I will bear that in mind in the future.
Bill