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  1. #11
    Join Date
    Apr 2011
    Rep Power
    During friction toner gets a negative charge, the carrier receives a positive charge. Toner goes on the drum, the positive carrier remains in development unit. Negative bias voltage helps to restore a neutral charge of carrier that he participated in triboelectric charge of toner. If the magnetic roller is covered with film then the carrier is not restored and bad charging toner . Poorly charged toner (not charged) can easily be attracted to negatively charged drum (in areas with no image voltage of the order - 900V)

  2. #12
    Trusted Tech 50+ Posts
    Join Date
    Mar 2011
    Rep Power
    Thank you infsergey for your detailed insight of the details. Learning never stops!.

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