C450i image quality issue

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  • barber782
    Trusted Tech

    250+ Posts
    • Aug 2011
    • 280
    #1

    C450i image quality issue

    PXL_20241104_124140147~2.jpg
    Greetings everyone,

    This morning we've had a C450i with some strange watermark like effects (black only) appear on the page.
    Machine has done around 300k and have replaced the black drum to see if it cures this problem.
    Unfortunately it hasn't made a difference. From the samples I have, the marks appear to be the same distanced apart as a drum circumference.
    Has anyone had one like this?

    Have a great day.
    Tags: None
    • copyman
      Owner / Technician

      Site Contributor
      2,500+ Posts
      • Sep 2005
      • 4546
      #2
      I know you posted black only but did you pull transfer belt out and look to see if any marks on it. If transfer belt was bad it should show on all colors but I would still look at belt.

        Comment

        • barber782
          Trusted Tech

          250+ Posts
          • Aug 2011
          • 280
          #3
          @copyman -

          Yes they removed the transfer belt assembly and inspected it. It does look a bit like when people try cleaning the belt leaving a residue, but not the case here.
          I did notice on the left margin directly inline with the marks there is an indentation.

            Comment

            • tsbservice
              Field tech

              Site Contributor
              5,000+ Posts
              • May 2007
              • 7927
              #4
              Originally posted by barber782
              PXL_20241104_124140147~2.jpg
              ..the marks appear to be the same distanced apart as a drum circumference.
              What is the distance - 94mm?
              A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.
              Blessed are they who can laugh at themselves, for they shall never cease to be amused.

                Comment

                • barber782
                  Trusted Tech

                  250+ Posts
                  • Aug 2011
                  • 280
                  #5
                  Sorry the technician forgot to mention that its actually feeding long edge 😅😅

                    Comment

                    • Synthohol
                      Certified Konica Expert

                      Site Contributor
                      5,000+ Posts
                      • Mar 2016
                      • 5745
                      #6
                      so that sample is letter\a4 size?
                      We know a thing or two because we've seen a thing or two.
                      The medication helps though...

                        Comment

                        • Sencho
                          Technician
                          • Feb 2023
                          • 19
                          #7
                          Have you tried with another developer unit? This problem can occur when the developer unit is near the end or if replacement toners are used. I think replacing the developer unit will be the solution.

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