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Need Help Vertical Banding on FB500

Discussion in 'Hewlett Packard' started by Charles@TheSignDude, Feb 28, 2019.

  1. Charles@TheSignDude

    Charles@TheSignDude Member

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    Jan 3, 2019
    Oregon
    We have been noticing a vertical banding on our printing lately on our HP FB500. Specifically on large darker colored sections. (see attached photos)
    We have tried re-leveling the printer (at the advice of an HP tech)
    we have tried checking the belt fans and cleaning the belt thinking its not holding down the sub-straight on that side. The banding only seems to happen on the user side of the prints.
    I'm still learning these printers and it would be a great help if anyone has had this issue and how they resolved it.

    Charles
     

    Attached Files:

  2. DerbyCitySignGuy

    DerbyCitySignGuy Very Active Member

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    Dec 12, 2013
    Kentucky
    Looks like a starvation issue. Not super familiar with the FB500, but my guess is the subtank can't fill quickly enough and by the time it gets to the end of the media, the head isn't getting enough ink from the subtank.
     
  3. flyplainsdrifta

    flyplainsdrifta Active Member

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    Oct 13, 2017
    ct
    carraige trolly assembly is what i had to replace to get mine to stop. is your carraige making alot of noise??
     
  4. Charles@TheSignDude

    Charles@TheSignDude Member

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    Jan 3, 2019
    Oregon
    I wouldnt say alot. we keep the rails well cleaned and oiled. But at this point we are scratching our heads.
     
  5. flyplainsdrifta

    flyplainsdrifta Active Member

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    Oct 13, 2017
    ct
    check your rail strips for wear on that side. ive heard of people wearing user side down a bit faster on smaller one off stuff if thats all theyre doing. also see if you can feel around your carraige wheels for binding or flat spots.
     
  6. Charles@TheSignDude

    Charles@TheSignDude Member

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    Jan 3, 2019
    Oregon
    Starting to lean on the side of the belt. there are some rough patches on the back of the belt and seemed kinda loose. Tightened the belt, seems like its improved but we are looking at the pulleys on the ends now. hard to tell but look like they might have a little wobble to them and can see the belt raising and lowering ever so slightly as it tracks.
     
  7. Bruce Mello

    Bruce Mello Many years in the Production Business

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    Sep 11, 2018
    Long Island, NY
    Replace you Hybrid HP with a true flatbed such as the Vanguard and you will have perfect prints!
     
  8. CharlieA

    CharlieA New Member

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    May 30, 2019
    Centennial Colorado
    Not possible. We had HP out for the same thing for 5 weeks and i came down to don't use tertiary colors like dark blues or that will happen says HP. It's in their user manuel on p215 for the 365. the 500 series is the same. We also had another shop try to print PMS 534 and they came out with vertical banding on different machines than the HP. Nature of the beast evidently.
     

    Attached Files:

  9. greysquirrel

    greysquirrel Active Member

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    Aug 13, 2015
    West Berlin, NJ
    usually caused by vibration across the rail with these printers. the 700/750 are worse because they are wider. Things to check scan axis motor could have black dust building up inside from bushings wearing down...easy to check. Carriage rail could be dirty or not oiled...too obvious for it to be this issue, the bearings in the trolley could be an issue, your carriage head alignments may not be accurately calibrated, usually part of the issue. You need a tech that knows what they are doing to fix this, carriage height could be off from a head strike.
    If its vibration down the rail, you can get by manually moving carriage...go buy some dynomat and cover the back edge of the rail...it will absorb the vibration. The 550/750 also had a small addition...that you can buy and install...there is a bracket (user side) that holds the scan axis motor. On newer models they took a piece of 2mm disband and covered both sides with dynomat....then mounted it between that bracket and the carriage rail....
     
  10. Charles@TheSignDude

    Charles@TheSignDude Member

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    Jan 3, 2019
    Oregon
    What specific manual are you referring to because we are looking in our pdf manuals not seeing anything regarding that. can you upload the one your looking at?
     
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