Have a c550 developed a background on print outs. Cleaned IU cavity and PH window, replaced the K IU and transferbelt. Cleaned the transferroller too.. Problem went away for a day then came back. The IU has the lockplate installed in place. I can't understand why it's still backgrounding, and looks to be spilling dev in a small pile in back of the machine. I have done background voltage margin adjustment - this corrected the problem for a day & half. Tried transfer fine adjustment to no avail.
Am I looking at a grounding problem? HV problem? Any Ideas?
Thanks.
Am I looking at a grounding problem? HV problem? Any Ideas?

Thanks.
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