konica 6500 image offset

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  • Holein1
    #1

    konica 6500 image offset

    I have a c6500 that started producing an image offset after the first full PM. It appears as if cyan, magenta and yellow are reproducing along a 1" strip along the leading edge of the page. Fuser unit has been replaced, two new boards in the back, all the developer and toner removed and replaced, new transfer belt...Offset is there off the glass or from a file. Black only or greyscale is fine. Only color. Copier is only 4 months old with 154,000 clicks. We have been down for a week now and time is running out! Any help would be greatly appreciated.
    Tags: 6500, bizhub c650, cleaning blade, down, fuser unit, help, image, konica, konica 6500, leading, offset, old, pulled, shee
    • random
      #2
      You have pulled the red screws out of the drums right? Scan a sample in for us to see.

        Comment

        • Setright
          FSS / SPM

          100+ Posts
          • Nov 2008
          • 247
          #3
          By any chance did you replace the primary transfer rollers within the transferbelt unit?

          Sounds like the black timing wheel on the side of the unit is out of sync with the CMY rollers.

            Comment

            • buster68
              Trusted Tech

              100+ Posts
              • Nov 2008
              • 181
              #4
              I think "random" has hit the nail on the head. I've had a couple of my techs forget to remove the red screws from the drum units and got the same result. The red screws are for the cleaning blade pressure, if they're left in, you get image offset.

                Comment

                • buster68
                  Trusted Tech

                  100+ Posts
                  • Nov 2008
                  • 181
                  #5
                  gosh, I hope they've got this fixed by now..this post is only 2 years old.
                  and I replied to it as well.

                    Comment

                    • texchar555
                      Senior Production Tech

                      100+ Posts
                      • Mar 2007
                      • 142
                      #6
                      Lol lol it must be late. I didnt noticed the date posted

                        Comment

                        • thuo
                          Trusted Tech

                          100+ Posts
                          • Feb 2008
                          • 155
                          #7
                          bihub c6501

                          i have a bizhub c6501 with duplex problem.when printing in duplex the backside print doesnt align with front side.eg when printing cards which are double sided front and back side are misaligned.what setting do i need to adjust to achive proper alignment in double sided printing.
                          thanks

                            Comment

                            • random
                              #8
                              Do you have a LCT unit or PF unit?

                                Comment

                                • thuo
                                  Trusted Tech

                                  100+ Posts
                                  • Feb 2008
                                  • 155
                                  #9
                                  Bizhub c 6501

                                  problem appears from both lct and all trays

                                    Comment

                                    • Si@danwood
                                      Trusted Tech

                                      100+ Posts
                                      • Mar 2008
                                      • 154
                                      #10
                                      could try "both sides adjust" How far out are the images

                                        Comment

                                        • thuo
                                          Trusted Tech

                                          100+ Posts
                                          • Feb 2008
                                          • 155
                                          #11
                                          Bizhub c 6501

                                          the shift is 0.8mm

                                            Comment

                                            • Si@danwood
                                              Trusted Tech

                                              100+ Posts
                                              • Mar 2008
                                              • 154
                                              #12
                                              Originally posted by thuo
                                              the shift is 0.8mm
                                              As i posted on another thread that IS WELL WITHIN SPECIFICATION.You can mess with settings to compensate for paper shrinkage etc.. but 0.8mm is way within manufacture expectations... check the S/M for tolerances( but over a D/Sided sheet i think is about 0.8% per side... ill let you do the math on an sra3 sheet)..si

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