C2451 on BizC450 - ITB Reset Error

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  • 907tec
    Trusted Tech

    250+ Posts
    • Feb 2008
    • 434
    #1

    C2451 on BizC450 - ITB Reset Error

    I've got a Biz C450 that refuses to reset the transfer belt. I have tried 63mA, 80mA, and 100mA fuses, as well as the inline pico fuses used on the fusing unit. I have tried 2 different belts, also.

    The machine seems to be recognizing the "new" belts, as it is going through the normal stabilization/warm-up process after installation. However, as the process finishes and the machine begins to come back to ready-state, I get a C2451 code. The fuses are not being popped, and I can't figure out why.

    I have already tried bending the contacts to ensure a clean connection, both inside the fuse chamber and on the machine side. I also traced the wires back behind the toner hopper assembly. Even when connecting the fuse directly to the two wires, bypassing the spring contacts and ITB fuse holder...same result.

    Unfortunately, I don't have another PWB-MC from a C450 to swap. There is no mention of relevant electrical connections in the service manual, so my next step is going to involve a lot of wire tracing.

    Anyone ever seen something similar? I'm totally in the dark on this one.
    Tags: belt, bizhub, c-code, c2451, c450, codes, connections, error, mcb, mrwho, reset, salvage, service manual, traced, transfer
    • Stirton.M
      All things Konica Minolta

      1,000+ Posts
      • Oct 2009
      • 1804
      #2
      Are there any P-codes showing? Usually if there is a P-code present because of an issue with the drums or IDC sensors, the belt will not reset the counter. Also, there could be an issue with the PSU, prcb or mcb which may be why the C-code is showing itself.
      "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

        • Stirton.M
          All things Konica Minolta

          1,000+ Posts
          • Oct 2009
          • 1804
          #3
          Description
          Life counter did not reset after replacingthe transfer belt unit more than once.
          Solution
          PROBABLE CAUSES:
          1.Failed PWB-MC.
          PWB-MC supplies the transfer belt fuse circuit with 24V DC from PJ8, pin 5. An easy way to check this voltage is to open the front door and remove the cover to the left of the yellow toner hopper (see attached photo) and verify the white connector has 24V DC. Replace the PWB-MC (p\n 4037 7803 03) if necessary.
          2. The transfer belt does not have 24V DC supplied to the fuse connector used to reset the life counter. PWB-MC failed.
          Replace PWB-MC (p\n 4037 7803 03).
          "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

            • mrwho
              Major Asshole!

              Site Contributor
              2,500+ Posts
              • Apr 2009
              • 4299
              #4
              Check for a blown fuse on the PWB-MC - I had that same problem on a C353.
              ' "But the salesman said . . ." The salesman's an asshole!'
              Mascan42

              'You will always find some Eskimo ready to instruct the Congolese on how to cope with heat waves.'
              Ibid

              I'm just an ex-tech lurking around and spreading disinformation!

                Comment

                • 907tec
                  Trusted Tech

                  250+ Posts
                  • Feb 2008
                  • 434
                  #5
                  Thanks MrWho. That is pretty much the answer that I was leaning towards. Tried putting a C351 PWB-MC in the C450. I knew it wouldn't work correctly, but I was curious about whether the belt would at least reset. Interestingly, the belt count reset when I put the new board in, but the machine mistakenly believes that it has incorrect M and K IU's now. Oh well. Time to wait for the new board, fingers-crossed.

                    Comment

                    • mrwho
                      Major Asshole!

                      Site Contributor
                      2,500+ Posts
                      • Apr 2009
                      • 4299
                      #6
                      Originally posted by 907tec
                      Thanks MrWho. That is pretty much the answer that I was leaning towards. Tried putting a C351 PWB-MC in the C450. I knew it wouldn't work correctly, but I was curious about whether the belt would at least reset. Interestingly, the belt count reset when I put the new board in, but the machine mistakenly believes that it has incorrect M and K IU's now. Oh well. Time to wait for the new board, fingers-crossed.
                      While you wait for the new board, why not check for blown ICPs and try to correct them? Maybe you can salvage the current board.
                      ' "But the salesman said . . ." The salesman's an asshole!'
                      Mascan42

                      'You will always find some Eskimo ready to instruct the Congolese on how to cope with heat waves.'
                      Ibid

                      I'm just an ex-tech lurking around and spreading disinformation!

                        Comment

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