one ink channel completely missing on test print

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

one ink channel completely missing on test print

Post by casementsigns » Thu Jul 06, 2017 10:33 am

Hi, I have an EJ-640, the test print is pretty much perfect except one black ink channel (out of two total) is completely absent from the test print pattern on head B. Cleaning (physical & via menu) doesn't help.

Any ideas? Thanks in advance.

I had this before with a different printer, if I recall there was an air bubble in the ink line. Could this be the case here? If so what's the best way to check and if relevant, rectify? Don't have a service manual for this printer sadly.

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mrtn
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Re: one ink channel completely missing on test print

Post by mrtn » Thu Jul 06, 2017 6:50 pm

You may have a damper stuck. Are you running OEM inks?
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casementsigns
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Re: one ink channel completely missing on test print

Post by casementsigns » Fri Jul 07, 2017 9:20 am

Yes, always Roland inks.

What is the cause of a stuck damper and how do I test for this please?

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mrtn
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Re: one ink channel completely missing on test print

Post by mrtn » Sat Jul 08, 2017 8:34 pm

There really isn't a test for that head type. Just replace and see if it fixes. OEM parts only.

Make sure the ink lines have no air bubbles before spending any money on parts.
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casementsigns
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Re: one ink channel completely missing on test print

Post by casementsigns » Tue Jul 11, 2017 4:10 pm

Can't see any air bubbles, do you know what the part number is for the damper please?

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