P-28 C451

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  • Gaffers01
    Trusted Tech

    Site Contributor
    250+ Posts
    • May 2011
    • 330

    P-28 C451

    I have a problem with a C451 that when customer copies anything green it comes out magenta,

    The machine has a P-28 code so I am unable to run graduation adjustments.
    I have printed the C M Y K test patterns and all come out fine.

    I'm hoping that if I can reset this P-28 warning code then i'll be able run the graduation adjustment for copying and it will be okay.

    I have ordered up the sensors beneath the Transfer belt, but if anyone has had a similar thing could you let me know.
  • EarthKmTech
    Step aside, noob

    1,000+ Posts
    • May 2009
    • 2142

    #2
    Re: P-28 C451

    remind me what P-28 error is, and I may have some advice.

    Comment

    • Gaffers01
      Trusted Tech

      Site Contributor
      250+ Posts
      • May 2011
      • 330

      #3
      Re: P-28 C451

      This is what the manual says, all iu's and transfer belt look fine.

      P-5
      IDC sensor (front) failure

      When adjusting the IDC sensor, output voltage
      detected for all eight sample patterns are 4.3 V or
      P-28
      IDC sensor (rear) failure
      more.


      with selected light intensity is 1.0 V or under.

      During image stabilization (gamma correction control),
      detected output value for IDC sensor did not go below
      threshold (half the value of what is detected by IDC
      sensor on the belt surface) for three consecutive times
      (position of the pattern end is not detected).

      During image stabilization (gamma correction control),

      tion after the primary approximation is half the detec-
      tion level on the belt surface or under

      Comment

      • 907tec
        Trusted Tech

        250+ Posts
        • Feb 2008
        • 438

        #4
        Re: P-28 C451

        Which exact test patterns are you using? I would be curious to see the gradation patterns for each IU on 11x17 as well as the color sample pattern.

        Comment

        • Albonline
          Service Manager

          1,000+ Posts
          • Sep 2008
          • 1116

          #5
          Re: P-28 C451

          do reset and stabileize and try a copy. if this helps the issue, then you are having a gradation problem, witch will require you to fix the idc sensors and run gradation.

          Comment

          • JustManuals
            Field Supervisor

            5,000+ Posts
            • Jan 2006
            • 9919

            #6
            Re: P-28 C451

            This Parts & Service Manual can now be purchased for $12.77 and downloaded immediately after payment from


            Just Manuals, The Internet's largest selection of manuals ~ Instant Downloads


            Paul@justmanuals.com

            Comment

            • EarthKmTech
              Step aside, noob

              1,000+ Posts
              • May 2009
              • 2142

              #7
              Re: P-28 C451

              C451 series have a common issue with the HV2 board not providing belt cleaning bias.

              You know when you have this issue because even with a new belt it just wont complete a stabilisation, usually due to a p-21 code which is generated because the stabilization pattern cannot be cleaned off the belt in a timely fashion and cannot be read properly the second and subsequent time round. Usually associated with this is transferal of smudgy remains of stabilization marks onto the firist few prints after an attempted stabilization.

              I've never ever had the IDC sensors fail even though i carry them in stock they have never been the cause of any issue in my experience (except when dirty)

              Ensure the IDC sensors are clean (and always clean them when you remove/replace a transfer belt for any reason, not doing so is a poor practice)

              Comment

              • M3HR4N
                Technician
                • Jun 2015
                • 34

                #8
                Re: P-28 C451

                Hi fellas
                I know it is an old topic but i have the same issue on a C452, changed an cleaned the IDC Sensor Unit with no luck.

                Comment

                • copier tech
                  Field Supervisor

                  5,000+ Posts
                  • Jan 2014
                  • 8006

                  #9
                  Re: P-28 C451

                  What is the life of the itb? The belt is the cause of most P code errors
                  Let us eat, drink, and be merry, because tomorrow we may die!

                  For all your firmware & service manual needs please visit us at:

                  www.copierfirmware.co.uk - www.printerfirmware.co.uk

                  Comment

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