Mutoh ValueJet 1304 Black ink issue

[SurfCitySigns]

So I had a tech come out to find out why the black was binding so badly.
We did a thorough cleaning and replaced pump, wiper, and cap.
Still lines in the black.

Im not sure why, maybe an attempt to help, but he "turned off" the A nozzle on the black. He said this should help, but it will print slower.
I had no problem with that at the time and the binding went away.

recently I noticed the dampers needed to be changed which I did.
2 weeks after changing dampers, the binding it back.

I want to turn the "A nozzle" back on, but didn't see how he did it, and Im having trouble getting a hold of him. Does anyone know how to do this?
I'm hoping this will fix the issue.

 

[randya]

In your profile settings or machine settings.

Superfine is the wave setting that will print using only channal A or B.
Change to anything but Superfine and you will use both channels.

 

[SurfCitySigns]

We rarely use Superfine, usually just Fine & Wave 1 or 2 but the problem is there with all the wave settings.
Just tried the syringe trick in the drainage pipe (going to the pump) with 70% isopropyl and it came out relatively clean so there don't seem to be any clogs.

 

[Edserv]

We get some banding with certain prints, while others look awesome. I (might wrongly) believe that the art files have something to do with this. Just because it's inconsistent. Especially when we receive pdf's. But overall, we're very happy with our Mutoh.

 

[randya]

Banding in certain prints, usually certain dark colors is related to profile and color management.

 

[J Hill Designs]

I would suspect the use of 70% iso on any part of the ink line of a solvent printer

 

[SurfCitySigns]

We were using denatured alcohol to clean it before being advised by a new tech that we should only use 70% iso. The problem was there before we began using the iso and nothing has improved or worsened since.

 

[FatCat]

We were using denatured alcohol to clean it before being advised by a new tech that we should only use 70% iso. The problem was there before we began using the iso and nothing has improved or worsened since.

I would strongly suggest ordering a bottle of ultra cleaning solution from Fellers, SignWarehouse, etc. It does a MUCH better job cleaning the printer and will last a long time since you use less of it.

 

[J Hill Designs]

yes, but adding water into a solvent ink train is bad news bears