Bizhub C454E Poor black density

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  • axdexter
    • Jun 2025
    #1

    Bizhub C454E Poor black density

    Hello. I have a C454E with around 60,000 copies. The black density is poor and streaky,
    almost like a bad drum. If you run halftones with any othercolor they are fine. Just black
    is bad. I swapped the drum and developer units, transfer belt and roller,updated firmware
    , swapped memory (never know), and the problem is still there. You can streaks in the copy
    count sheet, that are in opposite direction of the paper feed. I have an hv board ordered,
    along with a mfp board. Just looking for any suggestions.

    Thank for any help
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    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22997
      #2
      Re: Bizhub C454E Poor black density

      At the very least I would have calibrated the machine first. =^..^=
      If you'd like a serious answer to your request:
      1) demonstrate that you've read the manual
      2) demonstrate that you made some attempt to fix it.
      3) if you're going to ask about jams include the jam code.
      4) if you're going to ask about an error code include the error code.
      5) You are the person onsite. Only you can make observations.

      blackcat: Master Of The Obvious =^..^=

        Comment

        • matthewr88
          Technician
          • Jul 2015
          • 28
          #3
          Re: Bizhub C454E Poor black density

          looks like drum charge when the machines trying to do the full tones

          HV board is my first thought
          Can you fix it........we can fix anything its just how many parts do u wanna pay for

            Comment

            • axdexter
              #4
              Re: Bizhub C454E Poor black density

              I thought it may have been the Hv unit too. It will be in tomorrow and I will find out.

              Thank you for the help

                Comment

                • EarthKmTech
                  Step aside, noob

                  1,000+ Posts
                  • May 2009
                  • 2139
                  #5
                  Re: Bizhub C454E Poor black density

                  also check the black laser window hasn't been scratched the hell out of with spilled developer and cleaning wand.

                  rookie mistake if it has...

                    Comment

                    • axdexter
                      #6
                      Re: Bizhub C454E Poor black density

                      Originally posted by EarthKmTech
                      also check the black laser window hasn't been ground down with spilled developer and cleaning wand.

                      rookie mistake if it has...

                      I pulled the print head, it was spotless. No leaking developer units, and not a drop of dv anywhere. Of course opening a ticket
                      "check firmware, replace memory, than mfp board!". I dont think its a supply problem, I swapped drums around (swapping chip also),
                      before replacing the black drum and developer unit.

                      Checked Tech rep mode > State Confirmation > Table Number

                      All voltages are with a few volts of each other other than the black being 10v higher than the color.

                      Vdc - Developer Bias around for black was 368

                      Vg - Grid Voltage around 478

                      I will replace the hv unit tomorrow

                        Comment

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