E520 - badly jittering copies

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  • dragonslayer
    • Jun 2025

    #1

    E520 - badly jittering copies

    My E-studio 520 recently turns out to produce black copies like these
    img435.jpg img436.jpg

    Two months ago, I still can make copies with it. In 100 copies, there would be 20 badly jittering images. Now , the machine only prints out the bad copies.

    The thing is that there is no error code. It even makes bad copies from blank originals and Test print mode 04 -111 . I've changed the SYS board, LGC board, main charger , drum . Nothing is fixed.

    Do you guys have any ideas what are the causes here ? Thanks in advance , guys.

    P/s : I DO have the service handbook, do not try suggest buying it. I want to hear ideas how to fix the machine, please.
  • jim v
    Technician
    • May 2008
    • 41

    #2
    It is hard to tell from your pictures but this machine is famous for the drum drive gear slipping. Check the screw that secures the drum drive gear because it comes loose. Good luck.

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    • HASSAN
      Technician
      • May 2008
      • 43

      #3
      Chek mancharger and grid

      Comment

      • dragonslayer

        #4
        It's solved ! the drum drive gear really comes loose. Thanks guys !

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