NP6521 Dark copies

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  • hellcat
    Trusted Tech

    100+ Posts
    • Jan 2012
    • 124
    #1

    NP6521 Dark copies

    I know this thing is ancient and I don't know much about the old analog series machine. This machine has about 280K copies. Fuser looks fine, sponge corona looks fine.
    The drum looks decent. I did notice the developing/toner unit does not look like its coating the roller properly. (Again not sure this is normal on this unit) Took a few pictures of what the copies look like and the developer/toner unit. Anything else I should check?

    This is a picture of a Blank Page

    2013-03-14 14.15.01.jpg

    This is a picture of a copy

    2013-03-14 14.15.20.jpg

    This is the developer/toner unit

    2013-03-14 14.12.34.jpg2013-03-14 14.12.10.jpg
    Tags: cloth
    • teckat
      Field Supervisor

      Site Contributor
      10,000+ Posts
      • Jan 2010
      • 16083
      #2
      Re: NP6521 Dark copies

      try this>>

      remove dev metal roller> wipe off> then use metal cleaner (BRASSO) and a green no scratch pad> clean up good> wipe down w/dry rag> then clean off with alcohol damp rag> use dry cloth to clean off

      good luck/ How about getting a used / useful B & W Canon printer
      **Knowledge is time consuming, exhausting and costly for a trained Tech.**

        Comment

        • blackcat4866
          Master Of The Obvious

          Site Contributor
          10,000+ Posts
          • Jul 2007
          • 22999
          #3
          Re: NP6521 Dark copies

          It looks to me like you may have a mixture of OEM and generic toner in the developing unit. They do not mix well.

          Clean the developing unit like teckat suggests, vaccum it out completely, then install OEM toner. That should resolve your issue. =^..^=
          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

            • livancicm
              Technician

              50+ Posts
              • Sep 2008
              • 96
              #4
              Re: NP6521 Dark copies

              is optic clean

                Comment

                • teckat
                  Field Supervisor

                  Site Contributor
                  10,000+ Posts
                  • Jan 2010
                  • 16083
                  #5
                  Re: NP6521 Dark copies

                  Originally posted by livancicm
                  is optic clean
                  Optic clean enough to reflect the SUN > will not help that shown Dev Cylinder
                  **Knowledge is time consuming, exhausting and costly for a trained Tech.**

                    Comment

                    • JustManuals
                      Field Supervisor

                      5,000+ Posts
                      • Jan 2006
                      • 9838
                      #6
                      Re: NP6521 Dark copies

                      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

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