Gray image keeps on changing color tone in hp indigo 5500

[Raju]

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

 

[mantman]

There is an option that forces printing on same PIP side for each seperation try that.

 

[Adil]

Have you considered checking the calibration settings for the gray tones? Sometimes, a recalibration might help stabilize the color consistency

 

[Impredisa]

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