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One of the white channels is completely lost

 
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Old December 1st, 2016 Dec 1, 2016 1:12:49 PM -   #1 (permalink)
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Default One of the white channels is completely lost

Hello,

I have a problem. I bought a Polyprint Texjet Plus Advanced 3 months ago. After more than 2000 prints, 3 days ago one of the white channels (the one next to the black) disappeared. It's totally lost.

I checked the printhead with syringe and cleaning liquid, all 8 of the nozzles are open.

Today I exchanged the damper (white-white) and after power cleaning, the white channel was lost again. Not a single nozzle in the nozzle check. I re-opened the damper holder and saw the other 2 dampers next to the problematic had grey colors instead of white. (please see the picture).

Anyway I changed them too and after power cleaning I have 7 perfect channels and 1 lost white channel.

I have no idea why the white dampers turned to grey, the technician told me he has no idea either. I checked the possibility of leak but didn't see any.

The technician will visit us in 4-5 days so your help will be appreciated. Thanks in advance
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Old December 1st, 2016 Dec 1, 2016 2:08:35 PM -   #2 (permalink)
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Default

It is an odd one. By the look of it it's sucking up the ink bumped in the capping station when it does a clean.

I moved over to image armor and had the same prob with there white but it happened to all the whites. Looks like the white was to thick to make its way through the filter in the dampers and ended up sucking crap ink up. Moved back to dupont white and that works fine.

Maybe the temp is to low as I know the dupont white hates low temps (I keep my printer and ink in a room at 18c and above or I get probs printing white like misting due to the white build up on the printhead and channels missing)

Let me know how you get on

D
 
Old December 30th, 2016 Dec 30, 2016 2:46:45 PM -   #3 (permalink)
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Default Re: One of the white channels is completely lost

I'd try waterfalling the head, maybe you got a slight clogging in that one channel. It can happen sometimes. It looks like the one channel is compensating for the loss of the channel in the head so its pulling from the black, one damper shares 2 channels. Temperature, agitation of the whites, wet capping all make a difference and how frequent the prints are too
 
 
Old December 30th, 2016 Dec 30, 2016 2:47:19 PM -   #4 (permalink)
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Default Re: One of the white channels is completely lost

this is only my opinion but its good to get advice from your dealer too. Hope this helps
 






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