C654 with white spots on 2nd side

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  • francois
    service manager
    • Apr 2009
    • 32
    #1

    C654 with white spots on 2nd side

    Can any one help with a this problem. I have installes a brand new C654e machine and from the first duplex copy i made the machine makes white spots on the second side. i have lowered the 2nd image transfer voltage with no luck at all
    Tags: brand, brand new, copy, duplex, image, side, transfer, white
    • EarthKmTech
      Step aside, noob

      1,000+ Posts
      • May 2009
      • 2139
      #2
      Re: C654 with white spots on 2nd side

      the customer is using low quality paper, this must be addressed.

      every single 4 series will do this if poor quality paper is used.

        Comment

        • francois
          service manager
          • Apr 2009
          • 32
          #3
          Re: C654 with white spots on 2nd side

          Hi, the customer is using 80g normal paper. we tested that paper on a C652 that is standing next to the C654 machine, working ok. even on 120g,160g gloss and bond paper the machine is making the white spots

            Comment

            • dirtyfingers
              Technician
              • Sep 2013
              • 35
              #4
              Re: C654 with white spots on 2nd side

              There is a KM bulletin for this issue on the C654

              Search KM website for "starry effect (white dots) on reverse side "

              Cause
              Auto mode for 2nd transfer isn't very good
              Changing off auto has shown some good results for me

              There is also SW setting changes in Bulletin
              but I havnt needed to use them yet

              Sorry I don't have the Bulletin number

                Comment

                • JustManuals
                  Field Supervisor

                  5,000+ Posts
                  • Jan 2006
                  • 9838
                  #5
                  Re: C654 with white spots on 2nd side

                  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

                    Comment

                    • rajabi1367
                      Junior Member
                      • Dec 2015
                      • 5
                      #6
                      Re: C654 with white spots on 2nd side

                      I have this problem with C754e
                      In one-side every thing is OK, but when I print two-side, the first side (which is printed last) is with little dots.
                      I have tested on PaperOne and DoubleA papers, the same results

                        Comment

                        • copyman
                          Owner / Technician

                          Site Contributor
                          2,500+ Posts
                          • Sep 2005
                          • 4529
                          #7
                          Re: C654 with white spots on 2nd side

                          Problem Solution
                          ID: KBA00029701
                          Related Products:bizhub C754e,bizhub C654,bizhub C654e,bizhub C754
                          Related Options:


                          Problem
                          White spots (Starry night) on second side.

                          Solution
                          CAUSE: Firmware requires updating.

                          SOLUTION: Install firmware version K5 or newer and perform the following.

                          1. Service mode =>System 2 => software switch change dip switch 59 to hex 01.
                          2. Administrator mode => Security Settings =>Security Details. Change the following Engine Dip switches.
                          • Engine DipSw 25 to Enable
                          • Engine DipSW 26 to Enable

                          3. Make the following adjustments in Service Mode =>Image => Process Adjustment
                          • Transfer adjust => 2nd side transfer -5

                          4. Service mode => Machine => Fusing Temperature
                          • Adjust Fuser Temperature to -10

                            Comment

                            • Brett GS
                              Trusted Tech

                              100+ Posts
                              • Jun 2013
                              • 154
                              #8
                              Re: C654 with white spots on 2nd side

                              Hi all
                              I have got the same issue.
                              Machine worked fine until a brand new transfer belt was replaced,tried another new belt but no luck.
                              I have followed and applied all the above mentioned settings,the paper quality is decent.
                              Have the material quality that KM are using on the belts
                              nowdays gone down/cheap?.

                              Thanks
                              Brett

                                Comment

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