Fuzzy Prints / White Spots on Black only

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  • joelea
    Technician

    50+ Posts
    • Feb 2012
    • 64
    #1

    Fuzzy Prints / White Spots on Black only

    Have an issue where mono black prints are coming out fuzzy with white spots. It happens on halftone black 1 pc 255 density but doesn't show up on 64 density.

    Tried PRCB, Firmware, PH Unit, HV Unit, Black Drum, Black Dev, PH Relay Board. Have attached a sample in case anyone recognizes the issue.

    colour prints where black is made up of CYM is perfect.

    0001.jpg0002.jpg
    Tags: black, density, fuzzy, prints, unit
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22702
      #2
      Re: Fuzzy Prints / White Spots on Black only

      Originally posted by joelea
      Have an issue where mono black prints are coming out fuzzy with white spots. It happens on halftone black 1 pc 255 density but doesn't show up on 64 density.

      Tried PRCB, Firmware, PH Unit, HV Unit, Black Drum, Black Dev, PH Relay Board. Have attached a sample in case anyone recognizes the issue.

      colour prints where black is made up of CYM is perfect.

      [ATTACH=CONFIG]47421[/ATTACH][ATTACH=CONFIG]47422[/ATTACH]

      Did you say what sort of machine this is? =^..^=
      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

        • joelea
          Technician

          50+ Posts
          • Feb 2012
          • 64
          #3
          Re: Fuzzy Prints / White Spots on Black only

          Nope! haha oops , it's a bizhub c224e

            Comment

            • Max
              Senior Tech

              500+ Posts
              • Oct 2011
              • 526
              #4
              Re: Fuzzy Prints / White Spots on Black only

              Looks like low toner condition. Whats the toner value? If you add toner manually does the value change? What model? Post a colour test chart. If cym is ok that rules out sep roller. If it doesn't tone up possibly toner supply issue.

                Comment

                • blackcat4866
                  Master Of The Obvious

                  Site Contributor
                  10,000+ Posts
                  • Jul 2007
                  • 22702
                  #5
                  Re: Fuzzy Prints / White Spots on Black only

                  +1. Maybe developer drive clutch? =^..^=
                  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

                    • tsbservice
                      Field tech

                      Site Contributor
                      5,000+ Posts
                      • May 2007
                      • 7635
                      #6
                      Re: Fuzzy Prints / White Spots on Black only

                      Try to print this tricking the machine thick paper is used and post outcome. I believe but can be wrong that way machine will increase transfer voltages. Or you can try to increase second transfer in service mode.
                      Also make black test print at 255 density and post here.
                      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

                        • allan
                          RTFM!!

                          5,000+ Posts
                          • Apr 2010
                          • 5445
                          #7
                          Re: Fuzzy Prints / White Spots on Black only

                          Make sure there are no tweaks applied.
                          Go to image process adjustment and make sure all the settings there are set to default.
                          Like the TCR values, image background adjust, transfer voltage and density adjustments.

                          What is the K TCR level?
                          No C2557 errors?
                          Any P-codes?

                          On your own risk hit the devtank with a spoon full of toner and check for a density change.
                          Whatever

                            Comment

                            • patrickjlc
                              Trusted Tech

                              100+ Posts
                              • Feb 2015
                              • 212
                              #8
                              Re: Fuzzy Prints / White Spots on Black only

                              Maybe old or bad developer

                              Sent from my motorola one 5G UW using Tapatalk

                                Comment

                                • wjurls
                                  Trusted Tech

                                  Site Contributor
                                  250+ Posts
                                  • Feb 2017
                                  • 461
                                  #9
                                  Re: Fuzzy Prints / White Spots on Black only

                                  Possibly an issue with the transfer belt unit? First transfer roller for black not contacting the back of the belt?

                                    Comment

                                    • REGSIS
                                      Trusted Tech

                                      250+ Posts
                                      • May 2016
                                      • 434
                                      #10
                                      Re: Fuzzy Prints / White Spots on Black only

                                      Originally posted by blackcat4866
                                      +1. Maybe developer drive clutch? =^..^=
                                      With failed developer (black) drive clutch within few prints it will be completly blank because it would prevent magnet roller to turn. But check anyway.

                                      As mentioned above try to swap transfer belt from some other machine 22-36 ppm 4 or 8 series.

                                      Also try to clean PH winodow with a cleaning wand or take PH unit out and clean it manualy.

                                        Comment

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