Xerox DocuColor 242 (DC250 series) light banding black
I have a DocuColor 242 that's showing significant banding OB side in black only. I suspected bad drum-developer contact or a bad developer housing, but this doesn't seem to be the case. I have done the following:
replaced developer
replaced black drum
replaced the entire drum drawer with one from a good machine
cleaned ROS
replaced ROS
replaced 1st BTR
replaced entire ITB unit
replaced MCU
replaced charge (K) preclean HVPS
replaced developer bias (K) HVPS
replaced ROS flat cables
Some more things I could think of are NVM PWB, Power Unit, IOT driver PWB and flat cables between MCU PWB and IOT driver PWB. But honestly I'm getting a bit desperate and I'm also short on time. So I'd like to avoid a (further) wild goose chase and see if there's any suggestions here!
Attached is a full halftone 80% K. C, M and Y look good.
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