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Need Help HP Designjet L26500 - Yellow Not Printing Properly

Discussion in 'Digital Printing' started by BG-SIGN, Dec 19, 2019.

  1. BG-SIGN

    BG-SIGN New Member

    Apr 19, 2018
    Newtown, PA
    IMG_1691.jpg IMG_1692.jpg Hello,

    Currently, we are having printing problems with our HP Designjet L26500. I have attached two pictures for reference (printhead #4 specifically is what I'm talking about). The yellow is not printing correctly; it is discoloring and creating rows in my prints. At first, I thought it was the printhead, but I changed out the printhead twice, and still no success. Please let me know if anyone can help!
    Thank you,

  2. danno

    danno Member

    Mar 26, 2013
    Birmingham, AL
    Have you attempted to clean the contacts in the carriage assembly? Sometimes the "misting" inside the machine will accumulate on the circuit board in the carriage. I used to use a 70% isopropyl alcohol with a lint free swab to clean the contacts.
  3. Ere

    Ere Member

    Jul 12, 2018
    Check the ink lines going into the printhead. Do they look like the others or is black getting into your yellow?
  4. XtremeXccessories

    XtremeXccessories Member

    May 18, 2012
    Layton, UT
    It looks like you're having trouble with your #2 printhead as well, seems to be only firing cyan and not light cyan. Like danno said, try cleaning all your contacts in the carriage. The maintenance kit that came with your printer should have a little tool and cleaning swabs. If that doesn't help try cleaning your encoder strip (don't think that's it, but worth a shot).

    It almost looks like the printhead isn't being capped properly when it's not in use, some ink dried up on the printhead causing the ink to pool since it can't fire properly, and it bled into the yellow as it was being sprayed. I had a similar issue after my dumb machine didn't realize it was out of black ink and continued printing for another 100 square feet. Completely clogged the black so when it printed it would drop droplets of black ink and bled into the yellow.

    Is the test print you attached immediately after you swapped out the #4 head?
  5. Carlos Valencia

    Carlos Valencia Member

    Oct 14, 2018
    Dallas Tx
    Hi I would check the carriage pca, the carriage cables, the ink tube lines, and the ink primer assembly.
    Last edited by a moderator: Dec 20, 2019
  6. Ian Stewart-Koster

    Ian Stewart-Koster Active Member

    Sep 27, 2003
    Qld, Australia
    You said you changed the printhead twice- but did you change the wrong Y/K one, maybe?
    I'd be cleaning the contacts in the print head carriage, pretty severely.
    Last time my black wasbleeding into the yellow like that, it took 5 or 6 Y/K head cleanings, head wipes, and a couple or three of contact cleansings, and it was good for the next 8 months or more.