Need Help HP700 Print Quality

[CMY_K?]

On longer print runs , my HP 700 starts banding after about 20 feet. Currently, I’m running a job with 10 foot tall panels, and the first two or three panels will print fine, but then the third panel will start banding, and by the fourth one it is just terrible. See attached pictures. Any input would be appreciated!

Running IJ180v3, print mode 600dpi, 12pass

 

[balstestrat]

Seems like optimizer printhead needs replacing.

 

[CMY_K?]

Thank you for your response !
Obviously, I’m open to any suggestion to fix this lol. What makes you think it’s the optimizer?

 

[CMY_K?]

Here was the most recent color test

 

[balstestrat]

Your overcoat seems bad as well but you can run the "optimizer depletion test" from the image quality "..." top right corner menu. That will probably tell you.

 

[CMY_K?]

I didn’t even know that diagnostic Print menu was there. I guess I have been rather lucky with this machine, and not needed it.

Yeah, I can see a lot of issues with this optimizer print

 

[CMY_K?]

Going grab another printhead right now! If that solves this issue I will be pumped. Much appreaciated!