MXM550 jamming in LCC

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  • Dark Helmet
    Senior Tech

    Site Contributor
    500+ Posts
    • May 2009
    • 832
    #1

    [Jamming] MXM550 jamming in LCC

    Hey guys,

    A fellow i work with has a MXM550 that is jamming between the machine and the LCC (big LCC on the side 8.5x11 ARLC6)

    Jam codes are LPPD_S and LTD_S

    It looks like the LCC is feeding the paper to fast as he has seen a sheet ontop of the lead paper. At first he thought it was a double feeding problem but he has put the Herc feed rollers in and replaced the torque limiter. Both clutches have also been changed in the LCC. He has never been able to replicate jamming from the bypass tray which would suggest it's not a issue in the horizontal transport.

    Any body seen any thing like this?
    Evil will always triumph because good is dumb.
    Tags: bypass tray, codes, double, feed rollers, issue, jamming, lead, lead edge, ops, paper, replicate, sheet, sudden, symptom, symptoms, work
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22929
      #2
      Originally posted by Lawrence
      Hey guys, ... Jam codes are LPPD_S and LTD_S ... and replaced the torque limiter....
      The only time I've seen these codes on the AR-LC6 it was caused by the torque limiter. =^..^=
      If you'd like a serious answer to your request:
      1) demonstrate that you've read the manual
      2) demonstrate that you made some attempt to fix it.
      3) if you're going to ask about jams include the jam code.
      4) if you're going to ask about an error code include the error code.
      5) You are the person onsite. Only you can make observations.

      blackcat: Master Of The Obvious =^..^=

        Comment

        • OMD-227
          #3
          Mate, this is very common. It is the same code & exact symptom on the MX colors too with any side LCC.

          The problem is paper dust contamination of the LPPD sensor which is under the small cover of the LCC transport unit. Basically, take the 2 screws off the cover (running front to rear) so the LCC transport unit can fold back over. Under there you will see a small reflection sensor and a cavity below it. Either the sensor will be contaminated or the cavity (which is normally black plastic) will be white with paper dust. Either of these cases will cause the machine to fail to detect trail edge of the first page & lead edge of the second page, causing a double feed of 2 pages over each other. The machine then stops because it all of a sudden detects the paper at PPD sensors (and MPRD sensors as in the Dragon 1 & 2 cases), as it didnt detect at the LPPD sensor which it should have first.

          I see this all the time, especially on C-Dragons & Venus machine with a low grade paper. I know which clients I need to clean that sensor each visit because I know it will come back if not done.

            Comment

            • Dark Helmet
              Senior Tech

              Site Contributor
              500+ Posts
              • May 2009
              • 832
              #4
              Hey Wazza,

              LPPD is inside the machine under the bypass. LTD is in the LCC.

              I just spoke with the guy and he's there. He checked the LTD sensor and it's not a optical sensor.
              Evil will always triumph because good is dumb.

                Comment

                • OMD-227
                  #5
                  OK, I havent seen that sensor on the Dragon2's yet, but it is an optical sensor on the C-Dragons/Venus.

                  Its the same principle though as what I said above. LPPD_S jams are a double feed issue from the LCC when the machine cant see trail/lead edges. If you time it right, you can stop the machine and see absolutely no gap between the pages, almost like its one sheet of A3 instead of 2 A4's. The 2 sheets then end up on top of each other.

                  I'm quite sure this is a problem in the engine, not the LCC. It is the exact same symptoms & jam codes as other machines with the side LCC's.


                  ** I'm going out of mobile range now, but will check back in later. 7.40am thursday.

                    Comment

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