Yellow Saturation issues.

[SSIPRINT]

I ran a head wash with cleaning solution the other day, the yellow was not printing and appeared to have a back flow of black ink in it. After running a Power Clean the issue was resolved.
Now the saturation of the yellow will randomly just go away, but then sometimes return towards the end of the print. I've ruled out, issues with the ink, file, substrate, vacuum, and have done maybe 2 other cleans cycles.
I don't want to keep wasting ink and also like to avoid having a tech. come out!

One thing I have theorized is a bad seal on the Cap Top? However I don't know what a bad print would look like due to a bad seal.

Any help would be appreciated.

I apologize for blocks in the image(s).

 

[Solventinkjet]

What machine are you working on?

Looks like a damper failing to me.

 

[SSIPRINT]

What machine are you working on?

Looks like a damper failing to me.

It is a Roland LEC-330

 

[SSIPRINT]

I changed both of the yellow dampers, now I am not getting any Yellow to print....

after a bit more research, I found that I need to prime the damper using a syringe, (the youtube video I found didn't mention this). Hopefully this solves the issue.

I pinched of one of the dampers (they both split off one tube), removed the damper and syringed straight from the tube, I pulled a fair about of yellow/black ink out. I am having an issue with backflow after power clean. I've resorted to calling a technician.

(hopefully by documenting all of this, it will help someone out in the future!)