Help nozzle check

[dj_elite]

So I was having some problems a little while back with my MUTOH ROCKHOPPER 38" with printing black. I replaced the damper and O-ring and the print head. Things were going well for a while. Now my black isn't printing as good as it should. I checked for leaks and couldn't find any. I hooked my syringle directly to the printhead and flowed cleaning solution through it thinking it was dirty. After cleaning it all out, putting it back together, running a fill, and a few powerful cleaning cycles, still no difference! The printhead is about a month old. Here is a picture of my nozzle check and a close up of straight black printed on a 30" x 5" strip of vinyl. The black strip is all banded and the spots where the banding is almost looks like red? Any help would be appreciated. Having unhappy customers lately and its not good for business

Oh and the other 3 colors print fine on the nozzle check, just black giving me problems

 

[kffernandez]

hmmm.. that black test print looks like the one i had when i contaminated/shorted? my head with cleaning solution after soaking it.

did this particular print head go through anything other than the ordinary cleaning/manual cleaning cycles? did it get worse after flowing cleaning solution through it?

 

[dj_elite]

Stayed the same and did not get better. Thats why Im so confused. Everything seems to be working fine just my black. And like I said its a new head, doubt it would get clogged that fast

 

[J Hill Designs]

they clog in like 2 days if they don't sit right on the capping station...thats where I would look first...

 

[dj_elite]

how do you guys recommend unclogging the head?