Gray image keeps on changing color tone in hp indigo 5500

Discussion in 'HP Indigo Digital Presses' started by Raju, Oct 28, 2023.

  1. Raju

    Raju Member

    Joined:
    Nov 2017
    Messages:
    36
    Location:
    New Delhi, INDIA
    Hello All my Friends and senior members
    J am facing a weird issue in hp indigo 5500
    The gray color tone in an image keeps changing as I print the same image again nad again
    Work done
    1. Wh parameters installed
    2. Mcn reset
    3. Wh re installed after cleaning all air pipes no below are torn
    4. Whel 12cleaned and re installed
    5. All bdu re seated
    6. All scorotron cleaned
    7. Inks rebuild
    8. CPR ok
    9 configuration changed
    But no help ...Issue remains same
    Help is requested ....Please
    Raju
    W.A.. +919810689766
     

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  2. mantman

    mantman Senior Member

    Joined:
    Nov 2015
    Messages:
    274
    Location:
    Greece
    There is an option that forces printing on same PIP side for each seperation try that.
     
  3. Adil

    Adil Senior Member

    Joined:
    Nov 2021
    Messages:
    904
    Location:
    Casablanca
    Have you considered checking the calibration settings for the gray tones? Sometimes, a recalibration might help stabilize the color consistency
     

  4. Impredisa

    Impredisa Member

    Joined:
    Jul 2021
    Messages:
    28
    Location:
    El Salvador
    I think before dealing with WH parameters and all that stuff you have checked some other things first.
    1- The gray color you are printing is it CMYK or is it only black
    2- What screening are you using? I think the most effective screening on the 5500 are HDI-175 and HDI-180
    3- As mantman said above, you could set your press to keep every separation for printing on the same side of the pip for every sheet, I usually use that option when my pip is around 70k clicks or more; and it works very good.
    4- Would be good to check if the electrometer is not dirty, it may affect your tones while printing
     
    Last edited: Nov 3, 2023
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