Unfinished calibration. have you had the developer and drum recently replaced. I believe what happen was the developer replacement procedure was not followed, or the control board drum sensor have a problems/developer unit. Have a Konica Minolta Technician look at it. When was last PM performed.
Btw, I’m available to help over the phone in case u need at
https://www.6ya.com/expert/normanj_7893313f0751935f
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