MPC2500 Phantom Jams From Bypass

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  • Smee
    Trusted Tech
    100+ Posts
    • Aug 2009
    • 178

    MPC2500 Phantom Jams From Bypass

    Just after some help or ideas. Ive got an MPC2500 with phantom jams from the bypass, the machine says its jammed in the side door but there is never any paper there. It seems to be every 5th page or so when doing a job, but it still jams when doing single pages.

    SMC report logs the jams at location 08 - Bypass On.

    I tried SEF and LEF, didnt make any difference and I took apart the bypass feed assy, cleaned the rollers and couldnt see any obvious damage or anything out of place.

    When the machine jams during a job lot, it will beep when it jams but still clear the paper currently in the machine then stop. i.e. - all paper in the machine after the jam location exits to the finisher.

    When doing single page jobs it will jam before the bypass feed roller even turns - so I wondered if it was the feed clutch. I then ran a heap of pages thru the duplex without any jams - I thought the duplexer and bypass feed roller uses the same clutch or motor and expected it to jam but it ran perfect.

    I also printed from trays 1 and 2 to verify the reg sensors, fuser entrance sensors were good - no jams.

    Any ideas or help really appreciated - thanks.
  • Vulkor
    Senior Tech
    500+ Posts
    • Jun 2009
    • 942

    #2
    Not a lot too these bypasses, Yes the Duplex and Bypass motor are the same. Only thing could be wrong is a gear with missing teeth, Friction pad, Feed Roller worn or cored out in the middle. The only mechanical components in the bypass I see is a DC Solenoid, not sure what for your paper sensor and arm and some smaller wheels..

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    • Smee
      Trusted Tech
      100+ Posts
      • Aug 2009
      • 178

      #3
      Cheers Vulkor - yeah I agree it looks like a really simple system, but everything looked fine with no obvious defects. Im not sure what the solenoid does tho and the feed roller gear has a cut out - its missing teeth about a quarter of its radius by design, not broken, and it seems to be disengaged from the duplex motor gears when in its home position - and im unsure what turns it to engage the teeth again.

      Guess Ill take out a feed roller, friction pad and a solenoid.

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