Hello!
I have a consistent problem where the Green channel on my P9000, which is loaded with PiezoFlush. See attached nozzle check. There is clearly ink bleeding into the channel from adjacent channels, and lots of clogged nozzles. Because I don’t use the Green channel, it doesn’t affect prints, but I’m concerned about the problem spreading.
I am guessing the problem is related to the damper? I was wondering what else could be causing it?
P9000 loaded with Piezo Pro K4 inks. Green channel has PiezoFlush and Orange channel has PK loaded
Thanks
Neil
The Green channel should print PiezoFlush, not sure where the greyscale ink is coming from
Hi Neil,
I hope that you just have a dirty clean station and the Green channel is picking up ink from the flushing box. Take a look at the flush box after a head cleaning and see if it’s foamy or overly wet from not draining, or if the capping seals are grimy. We have videos on the InkjetMall YouTube showing how to clean the capping and flush box of a 9900. Yours will be very similar.
If it’s not that, there is not a way for any other ink to flow into the Green channel’s damper. It has a one way in ink line and a one way out valve.
The worst-case scenario is a split in the ink channel’s side walls allowing infiltration of ink from an adjacent channel. I would think that would show up in the adjacent channel with intermittent air “clogs”.
Rachel
1 Like
Hi Rachel
Thanks for this
When you say you suspect possible “split in the ink channel’s side walls” I presume you are referring to the side walls in the printhead itself? Which would mean a printhead replacement to rectify?
And my understanding is that on the printhead, Green and Orange are colour pairs. So in theory if there is a leak in the side walls of the Green channel then it is the Orange that is bleeding across into the Green. And that the contamination might start happening in the other direction as well?
Will check flush box and cap station again, but looked clean last time I looked
Damn and blast
Neil
I don’t suspect so! I am just saying in the worst case scenario. Usually it gets picked up from a leaking cleaning station in which the seal is not tight and dirty ink is pulled into the head. You can verify your position by printing out the inkseparation file in QTR Calibration mode and see if the Green Channel prints a pink 21 step. If so - then its a function of head cleaning and the clean station.
R
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Thanks Rachel
Will revert after more investigation
What’s going on with the LLK channel? It looks completely blank.
That would be GCO. It is really difficult to see unless you print on glossy paper.
Jon
Ah!!! Thanks Jon! I was wondering why Neil didn’t mention that.
