Question Mutoh, ink pulls back

[netsol]

we only print a couple days a week on our mutoh vj1617h, but i wet the captop daily & print a color wheel every day
i notice lately that from time to time the ink will "pull back" and i will be missing a color (normally cyan or magenta)

printhead, captop and dampers were new in january

does someone with more mutoh experience than myself have a suspect for what causes this issue?
oring? maintenance station?

 

[Solventinkjet]

It's most likely an air leak in the system above the dampers. Did you change the o-rings and connectors with the dampers? If not, that's where I would start. They are usually the culprit.

 

[damonCA21]

Yep I agree, it is normally the O-ring or the nut that holds it isn't tight enough. If its not that then it could be the ink cartridge isn't seated properly to make a seal with the needle