C 300 code 2556 yellow unit starving

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  • copiers4africa
    Technician
    • Jul 2009
    • 47
    #1

    [Error Code] C 300 code 2556 yellow unit starving

    pls help i am having a problem with a c300 color machine.


    code c2556 .

    replaced yellow toner and checked toner supply unit..all ok.

    replaced development motor and machine will run for ten copies then code 2556 comes back.
    also get p8 code replaced yellow image unit and did firmware.

    call came back after a few days.same code .
    replaced printer control board and mfp.

    still the same problem


    any ideas...
    Last edited by copiers4africa; 12-31-2010, 07:04 AM. Reason: added some info
    Tags: code, color, copies, firmware, image, motor, printer control board, starving, toner, unit, yellow
    • Stirton.M
      All things Konica Minolta

      1,000+ Posts
      • Oct 2009
      • 1804
      #2
      Are you sure it is a 2556 code? That code indicates an abnormally high toner condition, not a low condition, according to the manual. In tech rep, what is the TCR reading indicate?

      It seems you did all the standard fair regarding what to replace. It could be a shorted harness for the unit causing the problem. You'll need to have a friend help you meter that out, not so easy trying to reach both the front and back side. The P8 code is related to the issue, not an additional problem. Check the toner density control in tech rep to ensure that is not set to 3, if not, change it to 0 or lower. Check the IU in another machine if possible to eliminate the possibility the problem is in the IU itself. Run a bunch of half tone test patterns to reduce the levels.
      "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

        • copiers4africa
          Technician
          • Jul 2009
          • 47
          #3
          thnx you for your help like u say this is not normal..machine is indicating high concerntration of toner whilst the machine is straving..the atdc set was reduced to zero the -2 no change in the code.
          the tcr reading is aprroximately 13 percent.


          i am starting to think that it could b an electrical short or something in the wiring...


          Originally posted by Stirton.M
          Are you sure it is a 2556 code? That code indicates an abnormally high toner condition, not a low condition, according to the manual. In tech rep, what is the TCR reading indicate?

          It seems you did all the standard fair regarding what to replace. It could be a shorted harness for the unit causing the problem. You'll need to have a friend help you meter that out, not so easy trying to reach both the front and back side. The P8 code is related to the issue, not an additional problem. Check the toner density control in tech rep to ensure that is not set to 3, if not, change it to 0 or lower. Check the IU in another machine if possible to eliminate the possibility the problem is in the IU itself. Run a bunch of half tone test patterns to reduce the levels.

            Comment

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