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Check the cleaning blade the cleaning roller or the toner recycle system driven my the drum motor. to check the cleaning blade and toner roller remove the drum cartridge. Drum could flipped the cleaning blade toner roller could have jammed or motor bad great jam. worst case control board fault.
Sir/Mam, please check the model and the code looking at service manual for the Konica Series 7255 not such code per what model you currently have this problem with
The sensor is located on the left side of the drum cartridge it is a sensor that is covered with a white cover to the rear of the drum you must remove the drum to see it clean with cloth not a vacuum cleaner Static from vacuum can destroy it. The clear glass sensor is for paper jams! Located in the middle of the cartridge. Mite also want to know when the last 250K copies PM was done?
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