C-2551 Konica Bizhub C250

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  • Dave10
    Trusted Tech

    100+ Posts
    • Jul 2008
    • 197

    #1

    C-2551 Konica Bizhub C250

    We are having an issue with a C250. About 2 weeks ago, the customer called with a C-2551. We have seen this many times when the toner has just been replaced, and I went down and shook up the toner and let it cycle a few times and it went away. Then, a few days ago, it did it acain, C2551 and this time it would not reset. We took out the toner drive assy and checked it over and swapped the 2 motors, hoping the problem would follow the motor and we could replace the drive assy. No dice. Two days later, C2551. We have tried 3 Cyan Image units, and each one was good at the beginning, but a few days later when we checked them out, they were locked up, as if they were overstuffed with toner. Anyone seen this before? If so, any help would be greatly appreciated. Thank you in advance.
  • Konica_jr
    Technician
    • Aug 2010
    • 25

    #2
    Hi
    got it on a C252 ( with yellow )and it was the PWB-M (mechanical board)board just next the main power board, don't forget to rewrite the printer firmware after change it !

    Sorry for my poor English,

    hope it will help you !
    " French do it better " ^^

    Comment

    • pepper38_cnd
      Field Service Manager

      Site Contributor
      1,000+ Posts
      • Aug 2005
      • 1075

      #3
      The toner delivery tube is clogged remove the exit tray the toner cartridge and the IU and vacuum out the delivery tube. If your toner was in for very long in this condition the auger in side the toner is probably damaged so install a new toner after cleaning tube.
      Online Store is closed. Chip resetting is a thing of the past! Thank you to all my past customers.
      Now into Ip TV KODI Boxes

      Comment

      • Dave10
        Trusted Tech

        100+ Posts
        • Jul 2008
        • 197

        #4
        We were leaning toward the PWB-M, but will also look at the toner tube. I believe my guy already cleaned it out, but will confirm. Thanks. Will post when we know for sure.

        Comment

        • jma676
          Expert Tech
          250+ Posts
          • Mar 2009
          • 324

          #5
          Originally posted by Dave10
          We are having an issue with a C250. About 2 weeks ago, the customer called with a C-2551. We have seen this many times when the toner has just been replaced, and I went down and shook up the toner and let it cycle a few times and it went away. Then, a few days ago, it did it acain, C2551 and this time it would not reset. We took out the toner drive assy and checked it over and swapped the 2 motors, hoping the problem would follow the motor and we could replace the drive assy. No dice. Two days later, C2551. We have tried 3 Cyan Image units, and each one was good at the beginning, but a few days later when we checked them out, they were locked up, as if they were overstuffed with toner. Anyone seen this before? If so, any help would be greatly appreciated. Thank you in advance.

          C2551 = Abnormally low toner density detected Cyan (TCR Sensor)

          Comment

          • Dave10
            Trusted Tech

            100+ Posts
            • Jul 2008
            • 197

            #6
            Originally posted by jma676
            C2551 = Abnormally low toner density detected Cyan (TCR Sensor)
            we've tried different cyan IU's in the machine yet we get the same code. The TCR sensor is located in each of the IU's correct? So swapping the IU's out and getting the same code would eliminate the IU's being the problem. Any suggestions?

            Comment

            • jma676
              Expert Tech
              250+ Posts
              • Mar 2009
              • 324

              #7
              Should first check if the density of toner is low, in service mode, or restart the SC Code opening and closing the door again, the machine tried to restore the density of toner.

              All this is possible if you already reviewed that has nothing impermissible contacts of connectors and other parts of the IU. Just replace the unit by Original Cyan or any unit that you check this in good condition.

              Comment

              • Stirton.M
                All things Konica Minolta

                1,000+ Posts
                • Oct 2009
                • 1804

                #8
                Though I think the problem has been fixed now by KM, there is a possibility that the toner bottle itself may be the problem. An easy look and easy fix. New bottles when inserted into the machine, the cover for the toner feed hole should move to open the hole. There is a clear mylar seal that should peel back with the cover. In the past, this seal was not peeling back as it should, blocking the toner from leaving the bottle and filling the IU.
                "Many years ago I chased a woman for almost two years, only to discover that her tastes were exactly like mine: we both were crazy about girls."
                ---Groucho Marx


                Please do not PM me for questions related to Konica Minolta hardware.
                I will not answer requests or questions there.
                Please ask in the KM forum for the benefit of others to see the question and give their input.

                Comment

                • jma676
                  Expert Tech
                  250+ Posts
                  • Mar 2009
                  • 324

                  #9
                  Stirt OK this is obvious, the first thing I must mention is this, just to make clear certain steps.
                  Clarifies that toner cartridge in this case has no sensor, only based on statistical percentage of consumption.
                  If the toner consumption is abnormal is also a problem.

                  Comment

                  • Dave10
                    Trusted Tech

                    100+ Posts
                    • Jul 2008
                    • 197

                    #10
                    To follow up, we are still stumped here. As I said before, we have tried multiple Cyan I.U.s in this thing, and after a while, each one locks up, as if it is OVERFULL. We brought one in and took it apart to check it out and it is not only full, it is overfull. It was packed right up to above the edge of the mag roller and didn't want to turn. Also, we confirmed that the toner feed motors were turning. The tube IS NOT clogged. We sent the PWB-M in for repair and were told it checked out good. Konica had a help-desk entry about the power supply being the culprit, so we sent it in and it also checked out good. We are sort of up a stump. If anyone has any more ideas, PLEASE help. Thanks.

                    Comment

                    • Cantechman
                      Trusted Tech

                      Site Contributor
                      100+ Posts
                      • Nov 2008
                      • 227

                      #11
                      These are all the possible problems...


                      Imaging Unit /C
                      Toner Supply Motor C/K (M6)
                      Mechanical Control Board (PWB-M)
                      MFP Control Board (PWB-MFP

                      Comment

                      • jma676
                        Expert Tech
                        250+ Posts
                        • Mar 2009
                        • 324

                        #12
                        Originally posted by Dave10
                        To follow up, we are still stumped here. As I said before, we have tried multiple Cyan I.U.s in this thing, and after a while, each one locks up, as if it is OVERFULL. We brought one in and took it apart to check it out and it is not only full, it is overfull. It was packed right up to above the edge of the mag roller and didn't want to turn. Also, we confirmed that the toner feed motors were turning. The tube IS NOT clogged. We sent the PWB-M in for repair and were told it checked out good. Konica had a help-desk entry about the power supply being the culprit, so we sent it in and it also checked out good. We are sort of up a stump. If anyone has any more ideas, PLEASE help. Thanks.

                        Just review the units are correct, if you must replace them with new, or if you have some reset units, these units are the same ones that usually cause these types of problems. If you use reset units, is proved necessary to know how is the performance of image stabilization control.


                        C2551 Abnormally low toner density detected Cyan TCR Sensor.
                        • TC ratio in the developing machine, which is
                        determined by Toner replenishing amount control
                        mechanism, is 5 % or less for a given number of
                        times consecutively.


                        C2559 Cyan TCR Sensor adjustment failure.
                        • TCR Sensor automatic adjustment does not function
                        properly, failing to adjust to an appropriate
                        value.


                        Should first check if the density of toner is low, in service mode, or restart the SC Code opening and closing the door again, the machine tried to restore the density of toner.

                        All this is possible if you already reviewed that has nothing impermissible contacts of connectors and other parts of the IU. Just replace the unit by Original Cyan or any unit that you check this in good condition.



                        OK this is obvious, the first thing I must mention is this, just to make clear certain steps.
                        Clarifies that toner cartridge in this case has no sensor, only based on statistical percentage of consumption.
                        If the toner consumption is abnormal is also a problem.

                        Comment

                        • ineo+6501
                          Trusted Tech

                          250+ Posts
                          • Mar 2010
                          • 262

                          #13
                          Originally posted by jma676
                          Just review the units are correct, if you must replace them with new, or if you have some reset units, these units are the same ones that usually cause these types of problems. If you use reset units, is proved necessary to know how is the performance of image stabilization control.


                          C2551 Abnormally low toner density detected Cyan TCR Sensor.
                          • TC ratio in the developing machine, which is
                          determined by Toner replenishing amount control
                          mechanism, is 5 % or less for a given number of
                          times consecutively.


                          C2559 Cyan TCR Sensor adjustment failure.
                          • TCR Sensor automatic adjustment does not function
                          properly, failing to adjust to an appropriate
                          value.


                          Should first check if the density of toner is low, in service mode, or restart the SC Code opening and closing the door again, the machine tried to restore the density of toner.

                          All this is possible if you already reviewed that has nothing impermissible contacts of connectors and other parts of the IU. Just replace the unit by Original Cyan or any unit that you check this in good condition.



                          OK this is obvious, the first thing I must mention is this, just to make clear certain steps.
                          Clarifies that toner cartridge in this case has no sensor, only based on statistical percentage of consumption.
                          If the toner consumption is abnormal is also a problem.
                          Dear dear dear, this guy cracks me up

                          Comment

                          • Chromatik
                            Technician
                            50+ Posts
                            • Aug 2010
                            • 71

                            #14
                            Cracks? Looped!*

                            Comment

                            • jma676
                              Expert Tech
                              250+ Posts
                              • Mar 2009
                              • 324

                              #15
                              Next week, we talked*

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