ink channel not printing

Warranties, repairs and maintenance
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casementsigns
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Posts: 41
Joined: Tue Jul 17, 2012 10:07 am

ink channel not printing

Post by casementsigns » Thu Dec 14, 2017 4:41 pm

On my EJ-640 one of the ink channels (black) on one of the heads was not printing at all. Everything else fine. I suspected a stuck damper so changed the offending one for a new (original) damper. I did a choke clean after changing it. The result is I now have one of the yellow channels not printing also! So am I right to now suspect air in the line (which also got into the yellow line while working on the machine)?

If so, what's the best procedure? Use a syringe to draw ink through? And through what - the head, damper, ink line, etc?

Or could it be something else entirely?

Thanks in advance!

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mrtn
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Posts: 2419
Joined: Tue Feb 14, 2012 4:37 pm
Location: Tallinn, Estonia

Re: ink channel not printing

Post by mrtn » Thu Dec 14, 2017 6:30 pm

If there’s still air in the line after choke cleaning there’s something wrong in the vacuum system, a leak or a crack.

Avoid choke cleaning at all cost. If possible, don’t do it.
Roland Dealer since 1993
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