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Need Help FB700 - no yellow in beginning of print

Discussion in 'Hewlett Packard' started by FulSnygg, Jun 15, 2020.

  1. FulSnygg

    FulSnygg Member

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    Aug 10, 2015
    Sweden
    Have a problem with a HP Scitex FB700 that we can't figure out.
    When you start to print it doesn't print yellow, but yellow slowly builds up so after about 3 meters it prints yellow as it should. It's like a gradient from transparent to yellow. When it finally prints yellow, it prints yellow as it should - if you print continually. If we let it rest for a while we have to start the process over again to get any yellow at all.
    We print sheets in size 70x100 cm for test. First sheet: no yellow at all. Seccond sheet: start seeing yellow, especially around the edges. Third sheet: yet more yellow, still stronger around egdes. And so on. (See attached images)

    We have tried the following things without result:
    - Swapping ink pump
    - New ink cartridge
    - Swapping printheads
    - Changing termistor
    - New o-rings for the heads

    We have done the test of air valves, turning on/off, and it sounds "click" like it should.

    Vacuum pump sounds/works as usual, so we don't think there's any leakage in the air system.

    There is ink in the head/reservoir.

    Any ideas? We have opened a case at HP but no answers yet. Tech has no more ideas at the moment.

    IMG_20200615_161415.jpg IMG_20200615_222922.jpg IMG_20200615_161309.jpg
     
    Tags:
  2. danno

    danno Member

    407
    9
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    Mar 26, 2013
    Birmingham, AL
    Have you checked the inline filters above the thermistor? They are between the thermistor and the manifold.
     
  3. Boudica

    Boudica I'm here for educational purposes.

    609
    187
    43
    Dec 21, 2018
    WA State
    We are, as I type, having this problem with our HP 550. Thought we had a box of "underperforming ink", but after draining, putting in a new box and refilling the yellow - it worked fine for a bout 3 prints and now the problem is back. it's weird because it doesn't seem to lay down yellow for the first 3-4 inches - then it starts printing fine. I can't keep burning material.

    HELP! What could be causing this? More importantly, how do I fix it?
     
  4. Boudica

    Boudica I'm here for educational purposes.

    609
    187
    43
    Dec 21, 2018
    WA State
    If there is a problem here, would it not lay down yellow at first, then suddenly start laying down yellow for the rest of the print?
     
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