C364 Fading one side

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  • Guy Milner
    Technician

    50+ Posts
    • Nov 2013
    • 61
    #1

    [CQ] C364 Fading one side

    A problem that has stumped 2 Konica Minolta techs, with over 25 years experience each!

    We have a C364 (non e) with fading black on one side. Colours are perfect though.

    C364 CQ.pdfC364 example CQ.pdf

    See example (if the upload worked?)

    If you want to suggest what could cause it, please let me know and I will let you know if we have tried it!
    Tags: None
    • mo0651
      Service Manager

      1,000+ Posts
      • Apr 2009
      • 1054
      #2
      Re: C364 Fading one side

      What is feed direction?? We have seen Printheads do this.

        Comment

        • allan
          RTFM!!

          5,000+ Posts
          • Apr 2010
          • 5450
          #3
          Re: C364 Fading one side

          Had something that looks very similar.
          Thanks to Hans i got it sorted. Was on a C360 with a bent laser glass cleaning rod.
          Well no rod on this model but i would also say something is obscuring the laser from reaching the drum.

          Only other thing i can think of would be primary transfer voltage not making it to the transfer roller in the ITB.
          Bad contact on the machine side or the HV supplied?
          Whatever

            Comment

            • Guy Milner
              Technician

              50+ Posts
              • Nov 2013
              • 61
              #4
              Re: C364 Fading one side

              Originally posted by mo0651
              What is feed direction?? We have seen Printheads do this.
              The second example is an A3 (127 halftone) test page, so that should answer the feed direction question. The fading is from middle to rear. Printhead is a good call. We had the unit out for a thorough clean, but as yet, not replaced it. Will update. Thanks.

                Comment

                • Guy Milner
                  Technician

                  50+ Posts
                  • Nov 2013
                  • 61
                  #5
                  Re: C364 Fading one side

                  Originally posted by allan
                  Had something that looks very similar.
                  Thanks to Hans i got it sorted. Was on a C360 with a bent laser glass cleaning rod.
                  Well no rod on this model but i would also say something is obscuring the laser from reaching the drum.

                  Only other thing i can think of would be primary transfer voltage not making it to the transfer roller in the ITB.
                  Bad contact on the machine side or the HV supplied?
                  Nothing blocking the laser, from what we can see, but we will change the complete PH anyway. We suspected the transfer roller, for black, in the ITB. Replaced the unit and checked for poor connections etc.... As yet, we haven't gone down the HV route.
                  Thanks.

                    Comment

                    • AjitN
                      Trusted Tech

                      250+ Posts
                      • Mar 2009
                      • 287
                      #6
                      Re: C364 Fading one side

                      Hi
                      PH unit could be problematic.
                      Also pls check developer unit for less developer in qty or Trim bar out of adjustment.
                      By any chance right side door was taken out and fitted back, check the alignment for proper engagement of transfer roll and ITB. Or ITB itself.
                      This chance is remote as it will affect all the colors. best thing is to try with known good developer unit and drum unit.
                      Hope this helps

                        Comment

                        • Gaffers01
                          Trusted Tech

                          Site Contributor
                          250+ Posts
                          • May 2011
                          • 330
                          #7
                          Re: C364 Fading one side

                          I presume with 25 years experience each they have actually stopped the machine when
                          the black has written to the transfer belt and drum to have look at what image is actually being processed?

                            Comment

                            • Guy Milner
                              Technician

                              50+ Posts
                              • Nov 2013
                              • 61
                              #8
                              Re: C364 Fading one side

                              It was the Print Head. First time we have had an issue with a complete PH on the newer kit.

                                Comment

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