SC 543 (MP C2550)

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  • sharpmind
    Trusted Tech

    250+ Posts
    • Sep 2009
    • 478
    #1

    [Error Code] SC 543 (MP C2550)

    Replacing the power supply unit, thermistors and fusing belt does not resolve the problem Error occurs every other day. Any ideas?
    Tags: 543, 550, belt, error, fusing, power, supply, thermistors, unit
    • ruben
      The New Guy

      1,000+ Posts
      • Oct 2012
      • 1203
      #2
      Re: SC 543 (MP C2550)

      It is very rarely a PSU or BCU. Did you check the thermostats? (don't just check them in situ) Thermopile? What are the bearings like? Gears cracked or chipped? (Pressure gear is worse for this, also check the quality of the clutch gear).

        Comment

        • Iowatech
          Not a service manager

          2,500+ Posts
          • Dec 2009
          • 3930
          #3
          Re: SC 543 (MP C2550)

          Also, if you have time, you might want to check if this is a phantom error caused by unreliable power from the outlet the machine is plugged into. A long shot to be sure, but I've seen enough SC540 series error codes caused by unreliable power it is something you should at least consider after replacing those parts.

            Comment

            • sandmanmac
              Field Supervisor

              Site Contributor
              2,500+ Posts
              • Feb 2009
              • 3964
              #4
              Re: SC 543 (MP C2550)

              The GG indicates there's a TSB (#023) that relates to SC543 on this machine, but being the "have not" that I am, I have not got access to it ....Anyone?

                Comment

                • sharpmind
                  Trusted Tech

                  250+ Posts
                  • Sep 2009
                  • 478
                  #5
                  Re: SC 543 (MP C2550)

                  Originally posted by ruben
                  It is very rarely a PSU or BCU. Did you check the thermostats? (don't just check them in situ) Thermopile? What are the bearings like? Gears cracked or chipped? (Pressure gear is worse for this, also check the quality of the clutch gear).
                  Thermostats are good because there is continuity. Bearings are also good because i checked it while replacing the fusing belt.I also checked the voltage in the outlet and it is 220V. I am thinking to swap the whole fusing unit just to isolate the problem. I can reset the error code but still problem occurs in the next day.I will check SC history for error timings.

                    Comment

                    • Iowatech
                      Not a service manager

                      2,500+ Posts
                      • Dec 2009
                      • 3930
                      #6
                      Re: SC 543 (MP C2550)

                      Originally posted by sandmanmac
                      The GG indicates there's a TSB (#023) that relates to SC543 on this machine, but being the "have not" that I am, I have not got access to it ....Anyone?
                      I'm not sure that would help. The tech bulletin I found only has to do with bent metal parts on the upper frame of the fuser where the fuser exit guide is.
                      Although one part of it kind of says "Don't bend the upper fusing stay", and the yellow thermistor appears to be near that.
                      Last edited by Iowatech; 07-08-2013, 12:30 AM.

                        Comment

                        • Polarbear
                          Service Manager

                          1,000+ Posts
                          • Feb 2012
                          • 1070
                          #7
                          Re: SC 543 (MP C2550)

                          I agree with the posts above. SC543 is normally caused by a lamp NOT coming on so the status in the manual does not make sense. Thermal fuses are normally to blame so make sure you test all of them (out of circuit) as DMMs sometimes get confused and give false continuity with lamps in circuit.
                          Also test all lamps for continuity.

                          You did remember to clear the SC once you tested and reseated the fuser?
                          Press the GREEN button!!

                            Comment

                            • katash
                              Trusted Tech
                              • May 2010
                              • 221
                              #8
                              Re: SC 543 (MP C2550)

                              Originally posted by sharpmind
                              Replacing the power supply unit, thermistors and fusing belt does not resolve the problem Error occurs every other day. Any ideas?
                              i hope you replaced the thermostats and make sure your belt is not bumpy as the thermistors tend to faulter on temperature

                                Comment

                                • Cal
                                  #9
                                  Re: SC 543 (MP C2550)

                                  Check the fuser lamps.

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