MPC 4500 power on jams

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  • Hunts_bear
    • May 2025

    #1

    MPC 4500 power on jams

    What could cause power on jams if the customer has an MPC 4500 with out a bridge unit? It had 75 power on jams in logging data but the last recorded jam is from OCT 20th.
  • cosmic18
    Technician
    • Apr 2009
    • 19

    #2
    black guide plate above reg roller will be full of paper dust causing faulse reading remove guide plate clean

    Comment

    • teebee1234
      Service Manager

      Site Contributor
      1,000+ Posts
      • Jul 2008
      • 1670

      #3
      Power on jams occur when a door is opened during operation, technically not a paper jam. I would check all covers, try giving a shake to each one while it's printing. Most likely too much play between the interlock and an actuator or a flaky interlock itself.

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      • Fearless V K
        Senior Tech

        500+ Posts
        • May 2007
        • 620

        #4
        Replace the right side door switch.
        Don't take that toner with me!

        Comment

        • Hunts_bear

          #5
          Fearless, when you say right side door switch do you mean the front door switch on the right side or the switch for the right side door?

          Comment

          • Fearless V K
            Senior Tech

            500+ Posts
            • May 2007
            • 620

            #6
            The switch for the right side door, the large door that opens to access the paper path, fuser, etc.
            Don't take that toner with me!

            Comment

            • Shadow1
              Service Manager

              Site Contributor
              1,000+ Posts
              • Sep 2008
              • 1642

              #7
              I have more problems with the finisher door interlock switches anyway - now, the MP4500 (no C) is going to be the right side door switches. Another possibility is the customer not clearing a jam completely - some machines register that as a power on jam when they close the door instead of continuing with the old jam code.
              73 DE W5SSJ

              Comment

              • serpico
                Technician
                • Dec 2009
                • 14

                #8
                Hello,
                Replace the switches (2) on the bridge unit

                Comment

                • teebee1234
                  Service Manager

                  Site Contributor
                  1,000+ Posts
                  • Jul 2008
                  • 1670

                  #9
                  I guess you missed the part where he says there is no bridge unit. As a side note, I wish those that post their problems would follow up with what actually fixed the issue. Many do, but most don't.

                  Comment

                  • spaceman99
                    Senior Tech

                    100+ Posts
                    • Jul 2009
                    • 174

                    #10
                    Replace the 2 switches in the bridge unit. There is a RTB MOD out for this fault.

                    Comment

                    • Hunts_bear

                      #11
                      On the original post the customer wasn't complaining about the jams I just noticed it when I was there. I haven't been back and no service call since I was last there. I was just looking for possible causes in case I had to go back. Thanks for the replies and sorry for not updating.

                      Merry Christmas.

                      Comment

                      • teebee1234
                        Service Manager

                        Site Contributor
                        1,000+ Posts
                        • Jul 2008
                        • 1670

                        #12
                        Thanks Hunt Bear, I wasn't specifically singling you out. I was just venting in general terms because sometimes people have problems with many different solutions that are offered and it helps to know the one that worked so we can add it to our own knowledge base. Thanks again and Merry Christmas.

                        Comment

                        • Hunts_bear

                          #13
                          Went back to this copier this week and there was only 3 jams in the last 8k copies. I think it must have been dusty registration on vertical sensors.

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