blue mist in print

[Andrew Blackett]

Cant help but feel like I’m trying to "teach grandma to suck eggs" here!!

If that was me Chris I’d start with bi directional test and adjustment, probably after a good clean round the head.

Andy

[Robert Lambie]

quote Andy Blackett:

grandma

Not Grandpa? think thats was an indirect pop at you Chris! just saying… 😉 :lol1:

[Chris Wool]

It’s the single dots between the blocks. I have narrowed it down to the lt cyan head the normal test print don’t look to bad.
Seen the previous thread and may be time for a new head as when looked at really close are dots not a light mist as I first thought.

Andy I did ask for ideas and thank you fare shout

Been called a lot worse 😉

[John Thomson]

I would try removing and re seating the head ribbon?

john

[Chris Wool]

yes john next port of call as the dots are square not round droplets which makes me think some sort of electronic interference or just knackered.

[John Thomson]

I had some electrical interference on my import printer when running at its fastest setting causing the odd random pattern to be printed..loose or shorting head ribbon was the cause, I think it was moving a touch when decelerating and accelerating…..re seating the head ribbon cured it.

The dots are clearly because the head is receiving a command to fire.
It is certainly worth trying as cost is zero to do…. maybe even swap 2 over to try and isolate where the problem is?.

good luck…..these issues are so frustrating

John

[Stafford Cox]

All good suggestions from John. It may well be the head on its way out but I would try and eliminate as much as you can first. What inks are you running? A good way to eliminate the head is to swap the whole damper and line from the colour next to it and see if the overspray remains in the head position or stays with the position of the ink line. I’ve found this a couple of times lately with one particular ink supplier on Mimaki printers, it appears there is a bad batch of them at the moment which I must add they are doing a good job of resolving. I’ve not heard of it happening on Roland/Uniform printers but then I don’t see as many of them as I do Mimaki.

Let me know if you need talking through it.

Stafford

[Chris Wool]

thanks

been running the machine cmyk only and all well apart from the colour shift in grays. use the lt cyan and the dots return but are much reduced.
inks are ecosol max. always had roland inks.
keep trying to think when it started it showed up bad on a large banner but think it was starting before that.
not sure i want to contaminate the heads by changing ink supply over or have i got the idea wrong

[Chris Wool]

Happy bunny printing lovely again.
I fitted a new head to the black due to a few deflected then used the old black head in the lt cyan that was faulty. Result

[Stafford Cox]

Nice one Chris!!