Rear of Cyan Chanel Dropout.

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tdgraphics
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Rear of Cyan Chanel Dropout.

Post by tdgraphics » Mon Apr 30, 2018 10:47 am

Hi,

Yesterday I printed about 12 + meters of a wrap print ,teal and blue colour without incident.

However this morning I started to print some more of the wrap and I ran into problems very quickly.

I printed a test print, all perfect. I started my print and about 400mm in, it started to band badly. A recurrence of the problem from the past.

I printed a test print, and the right Cyan channel appear to only be printing the front nozzles, the rear most nozzles have stopped working. Every time this situation occurs, it is a similar section of the cyan channel that is missing.

Does anyone have any ideas what could cause this?

Cap tops, wipers etc all seem to be fine.

Any thoughts would be helpful.

Thanks in advance,

Neil
Attachments
Second test print.jpeg
Print showing 2nd test print.jpeg
Print showing first test print.jpeg

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mrtn
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Re: Rear of Cyan Chanel Dropout.

Post by mrtn » Mon Apr 30, 2018 11:10 am

Roland cartridges or bulk?
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tdgraphics
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Re: Rear of Cyan Chanel Dropout.

Post by tdgraphics » Mon Apr 30, 2018 11:13 am

Always Roland OEM Eco Sol Max cartridges.

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Re: Rear of Cyan Chanel Dropout.

Post by mrtn » Mon Apr 30, 2018 11:21 am

Then replace the relevant cyan damper first. If this does not help then it's very likely a printhead issue.
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tdgraphics
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Re: Rear of Cyan Chanel Dropout.

Post by tdgraphics » Mon Apr 30, 2018 11:28 am

Thank you for the help. I will get that sorted.

Neil

tdgraphics
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Re: Rear of Cyan Chanel Dropout.

Post by tdgraphics » Tue May 01, 2018 6:43 pm

Had the engineer here today. He was not sure if it was the damper. Anyway changes the damper and reset everything up. Changes the cap top too.

Printed a 2 meter section of the print that failed, all good. So I printed the sheet on the wrap material, first tile printed fine. Second tile had the same problem about 100 mm in. Did a powerful clean and tried the tile again, failed about 600 mm into the print.

So its not the dampers.

Any other ideas would be helpful.

Thanks in advance.

Neil

tdgraphics
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Re: Rear of Cyan Chanel Dropout.

Post by tdgraphics » Sun May 20, 2018 4:21 pm

Just an update. Problem still persists.

However had the engineer here for the morning last Thursday. He drained all the ink and flushed the lines and circulation system with cleaning fluid.

Then he refilled the system with ink, all dampers full etc, however now it only prints about 3 passes of cyan before the Chanel is empty of ink. The damper is full, the lines are full, no bubbles.

Its just appears that the channel does not have enough reserve ink to continue firing.

I believe this is the 3rd VS machine here in Ireland with the same problem. From what I understand the other 2 had all of this done to them and had the head replaced, but the problem persisted.

I find it had to believe that there is no solution to this, as it would appear on the face of it to be a simple ink starvation problem.

Any ideas would be helpful. Any Roland engineers / support staff, if you have any ideas, comments, please feel free to participate.

Thanks,

Neil

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Re: Rear of Cyan Chanel Dropout.

Post by mrtn » Sun May 20, 2018 5:41 pm

Have the engineer bypass the choke valve on that channel.
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tdgraphics
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Re: Rear of Cyan Chanel Dropout.

Post by tdgraphics » Wed May 23, 2018 6:49 pm

Martin,

Thanks for that. The engineer tried that, but no change. The pipes and damper are all full. The starvation happens after the damper.

Neil

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Re: Rear of Cyan Chanel Dropout.

Post by mrtn » Thu May 24, 2018 6:39 am

There’s only the printhead after the damper. Did he also try replacing the damper?
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