DC12 yellowish-gray background on color only

[Dexor]

Strange, after I got rid of white spots, I have this beige/yellowish-gray background but only on prints from computer/fiery and only on color ONLY.
When I print test charts from pws (dc612) - they have no background, even though they are color...

[SEnder]

What type of EFi Fiery you have? There is a patch for yellow printing. Download .ps and put it via Command workstation. It can be found on xerox site.

[Dexor]

This turned out to be IIT calibration problem. For some reason white reference went apexxx-it, after setting it and doing max setup it all came to good white background. Thanks for everyone's help.

[Dexor]

DC12 models are as cranky as old models in fashion business - now I get the same problem on another machine. This time confidently I do IIT calibration setup dc945/white reference adjustment - and it doesn't get me much better than before.
Manual suggest "manually reduce NVM locations 715-091, 715-092, and 715-093 by five units each, until background is acceptable. Do not exceed a maximum of ten units for each setting."
Hmmm - I get down to ten units below what machine spits out, and it gets me a tad better, but still background is visible.
I begin to pull my hair out - why are those DC12's so cranky??

[bojans]

Did you check cables from fiery to machine. Check if those cables have good connection. I had this problem when customer moved fiery to clean room or whatever. Due to weak connection cables get unplugged for just a bit, but it can make background.