C308 spots?

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  • copyman
    Owner / Technician

    Site Contributor
    2,500+ Posts
    • Sep 2005
    • 4616
    #1

    C308 spots?

    Hi,

    Anyone ever see a halftone test sheet like the attached? Only happening on black halftone test, CYM are fine. Tried new K drum didn't help. Developer is good and not depeleted. Regular color & mono prints look ok. Thanks in advance
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    • KMFLT3CH
      Trusted Tech

      100+ Posts
      • May 2017
      • 226
      #2
      Looks like K dev unit has been contaminated with bad, likely knockoff toner.

      edit: check the end cap on the toner bottle if it's sharktooth/wavy - I've had a lot of issues with those.

      Last edited by KMFLT3CH; 11-23-2024, 01:11 AM.
        👍 1

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        • Synthohol
          Certified Konica Expert

          Site Contributor
          5,000+ Posts
          • Mar 2016
          • 5798
          #3
          to me looks like the 1st transfer roller for black fell out of its little holder inside the belt and not enough pressure on one side?
          We know a thing or two because we've seen a thing or two.
          The medication helps though...
            👍 2

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            • copyman
              Owner / Technician

              Site Contributor
              2,500+ Posts
              • Sep 2005
              • 4616
              #4
              Thanks for the replies, I was going to return with a K dev unit and transfer belt. What's weird is the demo page and regular prints are fine.

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                • tsbservice
                  Field tech

                  Site Contributor
                  5,000+ Posts
                  • May 2007
                  • 7972
                  #5
                  +1 for bad toner. What's K tcr value?
                  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.

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                    • copyman
                      Owner / Technician

                      Site Contributor
                      2,500+ Posts
                      • Sep 2005
                      • 4616
                      #6
                      Originally posted by tsbservice
                      +1 for bad toner. What's K tcr value?
                      Genuine toner, all tcr values within range, around 6.5

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                        • Hansoon
                          Field Supervisor

                          Site Contributor
                          2,500+ Posts
                          • Sep 2007
                          • 3373
                          #7
                          You said you already changed the drum, but it looks very similar to what I had a month ago with a BH-C-280, and it turned out to be the K-drum.

                          Hans
                          “Sent from my Intel 80286 using MS-DOS 2.0”

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                            • copyTcat
                              Senior Technician

                              50+ Posts
                              • Apr 2015
                              • 58
                              #8
                              check if drum has any grounding issues. wqas this issue also on the old drum you removed?

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