black copy and display sc300, sc400

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  • stanleyko
    Junior Member
    • Oct 2015
    • 1

    #1

    [Error Code] black copy and display sc300, sc400

    Hi.
    My katana works a few hours a day and soethimes occurs black copy and in log sc 300,sc400. I replace developer, charge and pre charge unit (500k), dev unit and drum 2000k. Somehimes works well for 100k copys somethimes not.
    Any feedback welcome.
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