Bizhub 350 C-4721

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  • mgf

    Bizhub 350 C-4721

    Good day.

    This machine had to have the harness that connects the HV1, Developer Unit, Main Counter and assorted sensors to the PWB-A because it had been gnawed on by a mouse.

    We experienced first a code 2557 and that is what led us to find the broken harness.

    After replacement we found that we now have a code 4721 and have done everything short of replacing the machine.

    Any suggestions?

    Thanks

    MGF
  • sefakos

    #2
    Check the power supply unit.

    Comment

    • mgf

      #3
      Thank you sefakos we are waiting on a power supply. I will post results

      mgf

      Comment

      • mgf

        #4
        Replaced PU to no effect. I wish Koninolta would tell me exactly what could cause this code, aside from their broad explanations.

        I have asked them to get with engineering to request more info on this but they have not responded.

        Comment

        • bgbas
          Technician

          50+ Posts
          • Feb 2007
          • 60

          #5
          According to my info, the IC mounted on the MC board has failed.

          Good luck

          Comment

          • mgf

            #6
            Unfortunately for us, we have replaced the PWB-A and IC as a set and it still pops the same code. I asked Konica if this was OK, in other words, that the IC/PWB combo is not tied to a machine and they said they are only tied to each other.

            I am running out of ideas and stuff to replace. So far we have replaced

            PWB-A and IC as a set
            MFBS
            BCRS
            HV
            PU
            and the chewed up harness.

            The machine turns on, fuser does not come on, PU fan comes on, panel lights with KM logo, DF goes red (no siren) and up pops C4721.

            We are able to go into service modes from the utility SW and from the soft reset.

            We reset the trouble code and then we get an abort 0x00f00b00 which relates to their infamous NVRAM, however, we have swapped the MFBS/NVRAM combo to no avail.

            All ideas are appreciated.

            tnx mgf

            Comment

            • Scott_Lewis
              Senior Tech

              500+ Posts
              • Mar 2007
              • 519

              #7
              Originally posted by mgf
              I am running out of ideas and stuff to replace. So far we have replaced

              PWB-A and IC as a set
              MFBS
              BCRS
              HV
              PU
              and the chewed up harness.

              The machine turns on, fuser does not come on, PU fan comes on, panel lights with KM logo, DF goes red (no siren) and up pops C4721.

              All ideas are appreciated.
              OK, here are some ideas......

              1. If the old harness wasn't too badly damaged, track down what wires / signals / components could have been shorted , especially to the high voltage.

              2. Remove/disconnect every possible option from the main machine including the HDD.

              3. Try another Laser Board - that has a data buss that might be connected to this mysterious GA gate array. Same reason for removing the HDD. Those were the only units that I saw that had a data buss.


              Good luck. Shorting the HV to the electronics sounds like a nightmare. It could have gotten to just about anything in the copier.

              Comment

              • mgf

                #8
                Thanks Scott Lewis, let me try that on Monday. Appreciate the ideas.

                mgf

                Comment

                • CMB
                  KonicaMinolta Tech.

                  250+ Posts
                  • Mar 2005
                  • 458

                  #9
                  c 4721 after the pwb-a was replaced.

                  eeprom not transferred from original pwb-a

                  install the original eeprom (IC3A) onto the replacement pwb-a

                  this was all i could find.
                  http://christianoutdoorsman.com/forums/
                  www.lewisdigital.net
                  Lewis Digital
                  630-1 Capital Circle N.E. | Tallahassee, FL 32301
                  Telephone: 850.222.4418

                  Live such good lives among the pagans that, though they accuse you of doing wrong, they may see your good deeds and glorify God on the day he visits us. 1 Peter 2:12

                  Comment

                  • Bizhub
                    Trusted Tech
                    • May 2007
                    • 147

                    #10
                    It sounds like the eprom is not fitted correctly or it is damaged. Remember the cut out on the board meets the dot on the IC

                    Firstly check all the connections of the new board and refit the old eprom (if you still have it)
                    In the past I have had silly faults caused by the mechanical counter.

                    I am not sure if the nvram would cause this fault, but swap it with a working machine to find out.

                    Hope this helps

                    Regards

                    Bizhub

                    Comment

                    • Downunder
                      Trusted Tech

                      100+ Posts
                      • Aug 2007
                      • 174

                      #11
                      Just a thought, have you tried putting another image unit in, have some tricky faults with these sometimes.

                      Comment

                      • Downunder
                        Trusted Tech

                        100+ Posts
                        • Aug 2007
                        • 174

                        #12
                        Just a thought, have you tried putting another image unit in the machine. These can produce some weird faults

                        Comment

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