c450 machine status p-21

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  • memphis
    Technician
    • Sep 2009
    • 13

    #1

    c450 machine status p-21

    machine: bizhub c450
    problem: status code P-21.

    Hello. I just reset the fusing unit and image transfer belt today by changing the fuses. After everything was done, the machine seems to take much longer to stabilize the image on first boot up and there's an "A" icon at the bottom, when clicked, says Machine Status P-21. I searched around and it turns out to be a color gradation problem.

    I entered tech mode and printed out the color gradations, seems like the cyan gradation has problems, it's just missing a blob. Any ideas on how to fix this and how to help with the slow image stabilization? During image stabilization it sounds like the belt and gears are spinning more than usual and there's some odd grinds to it. After a little, it says Ready to Accept Jobs and theres no more grinding, even when printing or copying. Did I slide the transfer belt in crooked? Thanks.

    Besides those two quirks everything seems to work fine.
    Last edited by memphis; 11-20-2009, 04:06 AM. Reason: add machine info
  • albasoul06

    #2
    P-21: Color Shift Test Pattern failure
    Wipe clean the surface of the Transfer Belt with a soft cloth, if it is dirty and change the Image Transfer Belt Unit if is damaged.

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    • albasoul06

      #3
      service manual page 403

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