Black printing as grey!

[Nicola McIntosh]

could be air bubbles running through out the ink tubes? 😀

[David Graves]

That’s what it looks like to me but whats the best way of getting rid of these? I have been pulling ink through, but its been spluttering through as opposed to flowing like it usually would when you use a syringe to draw ink through.

[Phill Fenton]

It could be a broken damper causing this

[David Graves]

I second guessed this so have ordered two for tomorrow. Fingers crossed replacing them works. Thanks

[David Graves]

I have changed the dampers but still appear to be struggling with the black ink. I have been trying to pull some through but am now getting nothing at all.

Any other suggestions please?

All pumps and tubing were replaced about 4 weeks ago so im guessing there is not a problem with any of these.

[Glenn Sharp]

I would check the tubing again….if it hasn’t been pulling through properly for a couple of days there might be a blockage there

Assuming you are using cartridges, have you tried a new one?

[Derek Heron]

make sure your cartridge seal is ok
as glenn mentioned try another

derek

[David Rowland]

although i have different printer, the principles are the same.
I have almost found our air-leak, hoping the changes I did last night will solve it. it has cost a lot of money.

1: Syring on pumps side, plenty of resistance (pumps were changed weeks ago)
2: Damper change
3: head change (ouch)
4: capping station change (it needed it as the sucking-rings were wide)
and now I have re-cut the pipe feeding the damper and swapped o-ring & nut with another ink line. Hoping problem has moved or gone away.

If ink is going back or running out, its normally a flow of ink issue, so starting at the damper to finding where air is getting in.

At the end of the print cycle the JV3 does a quick pump/purge and clears the problem, so maybe the uniform does the same thing.

[David Graves]

Since i have replaced the dampers i have noticed that the tubes which lead to them have no ink in. Whats the best way to get the ink running through these tubes into the dampers?

[David Graves]

After speaking to my engineer, he has instructed me that it may be the seal that is letting air in as I am getting a hissing noise when using a syringe to pull ink through. I have cleaned the head and realigned the carriage but still the same result……i am now at my wits end.

[Stephen Morriss]

Check your pump if it’s the old heart type one. Put a clamp on the capping side and pull with a syringe on the bottle side, if you get air through easily then the pipe is split.

If your using bulk check the seals as they go eventually, same with older cartridges.

Make sure you’ve seated the pipes and dampers properly.

As a last resort try a new cartridge, the old one may be nearly empty and a dodgy seal will let air into the ink bag.

Steve