Pressure loss on black, air leak in tubing connector?

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itfben
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Pressure loss on black, air leak in tubing connector?

Post by itfben » Sat Mar 11, 2017 11:45 pm

Nearly there fixing my VP-540. The only thing now is a new problem being, the lack on pressure on the black now to sort, I think that's down to an air leak - possibily the blacks ink line splitter (3way tubing connector) as I even put 2 new dampers on the black and ink still keeps going back up the printer, back towards the cartridges and not staying in the head grr.

And suggestions,

I think I hear a little air hissing when stringing the black from the waste line off the cap top - after 2mls of air then the syringe does fill with ink and you can see it going back down the lines to the printhead and come through so something isn't holding pressure.

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mrtn
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Re: Pressure loss on black, air leak in tubing connector?

Post by mrtn » Sun Mar 12, 2017 12:45 am

You may have a hairline crack in the manifold where the dampers seat. They're really fragile, damper replacement is a delicate job. Tube/damper connection tight?

Other possible leak may be between the print head board and the manifold, but you need to be absolutely sure this is the culprit, you can't reseat it after disassembly. And the captop, of course.
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itfben
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Re: Pressure loss on black, air leak in tubing connector?

Post by itfben » Sun Mar 12, 2017 6:22 pm

I can't see how the cap top could be a culprit as that's cleaning not printing. I can get ink down into the dampers but I start printing and then the ink drains back up the tube all be it slowly, but enough to effect my print, I think it's actually the front on of the two, that back damper seems to stay full I think.

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Re: Pressure loss on black, air leak in tubing connector?

Post by itfben » Mon Mar 13, 2017 5:38 pm

My dampers on the black are slight smaller than MCY ones?

I changed manifold for a spare I had about and trying to pack out about the black dampers with cardboard between foam plate to ensure dampers are pushed down onto manifold as much as taller dampers.

The prints better, but not sure it's 100% as air is still appearing in the top of the front dampers black ink line. Also there's a minicule excess black mist when printing black test squares. Although the black square so look good colour.
IMG_5509.JPG
Fine black mist outside black square edge.

itfben
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Re: Pressure loss on black, air leak in tubing connector?

Post by itfben » Mon Mar 13, 2017 6:11 pm

See air bubble on on one of the black ??
IMG_5511.JPG
IMG_5512.JPG
Grainy Photo of some corrugated building

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mrtn
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Re: Pressure loss on black, air leak in tubing connector?

Post by mrtn » Tue Mar 14, 2017 7:10 am

There must not be any air in the ink line except in the top of the damper chamber.

All original dampers are identical and match the L-plate height.
Yours is probably not OEM.
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itfben
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Re: Pressure loss on black, air leak in tubing connector?

Post by itfben » Tue Mar 14, 2017 7:54 am

mrtn wrote:
Tue Mar 14, 2017 7:10 am
There must not be any air in the ink line except in the top of the damper chamber.
Well I know that lol. What I don't know is why the air is in there and keeps coming back even after I have syringe it out via waste tubes

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Re: Pressure loss on black, air leak in tubing connector?

Post by itfben » Wed Mar 15, 2017 2:11 pm

So what might be causing the air bubble if even after I changed the manifold I'm still getting this?

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mrtn
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Re: Pressure loss on black, air leak in tubing connector?

Post by mrtn » Wed Mar 15, 2017 2:36 pm

Any connection can be the culprit. Damper/manifold/captop.
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Re: Pressure loss on black, air leak in tubing connector?

Post by itfben » Tue Mar 21, 2017 1:09 am

Does this indicate anything more specifically that might be causing my air intake from somewhere?
IMG_5651.JPG

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