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:
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.
- 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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