Bizhub pro 920 print quality fading on edge of paper

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  • Mattdlam
    Technician
    • Apr 2013
    • 32

    Bizhub pro 920 print quality fading on edge of paper

    Any ideas on what may be causing fading of printouts on the edges of the paper?, I have changed developer, drum, cleaning blades and charge wires but issue occurs after printing a couple of books.
  • CompyTech
    Super Tech

    500+ Posts
    • Feb 2011
    • 706

    #2
    Re: Bizhub pro 920 print quality fading on edge of paper

    Did you run all the Image Process Adjustments? Try changing drum temp. sensor. I've had to change it to resolve grey backgrounds. Service manual says to change it at 3 Mil I believe. There is another sensor too under the drum (TDSB I believe? ) similar to the 750 series. It's the one you're supposed to clean it every PM or clean up etc.

    Comment

    • blazebusiness
      SanDiegoCopierRepair.com

      Site Contributor
      1,000+ Posts
      • Apr 2010
      • 1246

      #3
      Re: Bizhub pro 920 print quality fading on edge of paper

      Originally posted by Mattdlam
      Any ideas on what may be causing fading of printouts on the edges of the paper?, I have changed developer, drum, cleaning blades and charge wires but issue occurs after printing a couple of books.
      Compytech is on the right track when he steered you toward image adjustments. On that particular model.....there have been problems with light images on longer job runs when running a lot of high coverage prints. Konica has put out tech bulletins(TAUS0653374EN) with adjustment procedures for this issue. --------------CAUSE:A 30% to 50% or greater image coverage per page
      SOLUTION: Do the adjustments outlined in the tech bulletin to improve image density when running high percentage of coverage originals.Topics that should be addressed are:
      Adjust machine to increase image density.

      1. to prevent density reduction during continuous print.
      2. to prevent density reduction during high coverage print.
      3. to prevent halo effects around outline characters in halftone or solid black image.
      4. to prevent density difference between side 1/side 2 and poor transfer on side 2.

      In my experience ....The drum temp sensor would only be a possibility if you were having background......not light print at the edges. Focus on the adjustment procedure.
      Last edited by blazebusiness; 05-29-2013, 11:24 PM.
      sigpicAnything can be made to work if you fiddle with it long enough- San Diego Copier Repair.com

      Comment

      • JustManuals
        Field Supervisor

        5,000+ Posts
        • Jan 2006
        • 9919

        #4
        Re: Bizhub pro 920 print quality fading on edge of paper

        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

        • methogod
          Senior Tech

          Site Contributor
          500+ Posts
          • Dec 2008
          • 914

          #5
          Re: Bizhub pro 920 print quality fading on edge of paper

          can you post images...

          i have 7 of these, if we have not seen it - i prob doesnt happen. I have 2 with over 10 million, and another with almost 19 million.


          let me see what you call light fill...

          also do you have the Recycling kit installed?

          may just need to up the laser just a bit. (as these get older the laser gets weaker).

          Comment

          • SmellsHot
            Head Tech

            500+ Posts
            • Dec 2009
            • 512

            #6
            Re: Bizhub pro 920 print quality fading on edge of paper

            Also make sure to clean the lasers glass(above drum unit). These can get hazy/dusty over time.....It will greatly change copy quality if it's dirty...
            Everyone has the right to be stupid. Some people just abuse this privelage more than others

            Comment

            • Mattdlam
              Technician
              • Apr 2013
              • 32

              #7
              Re: Bizhub pro 920 print quality fading on edge of paper

              Originally posted by methogod
              can you post images...

              i have 7 of these, if we have not seen it - i prob doesnt happen. I have 2 with over 10 million, and another with almost 19 million.


              let me see what you call light fill...

              also do you have the Recycling kit installed?

              may just need to up the laser just a bit. (as these get older the laser gets weaker).
              Thanks for the responses I have attached the examples, I have cleaned the machine, did adjustments, will try the sensors in a short while and do the adjustments again.
              Attached Files

              Comment

              • eg101
                Trusted Tech

                100+ Posts
                • Jan 2005
                • 131

                #8
                Re: Bizhub pro 920 print quality fading on edge of paper

                Looks like laser problem. You sure the glass is clean.

                Comment

                • Mattdlam
                  Technician
                  • Apr 2013
                  • 32

                  #9
                  Re: Bizhub pro 920 print quality fading on edge of paper

                  Originally posted by eg101
                  Looks like laser problem. You sure the glass is clean.
                  Will double check the laser and revert, sorry for the stupid question,what will you suggest I use to clean the laser that will do a good job?

                  Comment

                  • blazebusiness
                    SanDiegoCopierRepair.com

                    Site Contributor
                    1,000+ Posts
                    • Apr 2010
                    • 1246

                    #10
                    Re: Bizhub pro 920 print quality fading on edge of paper

                    Originally posted by Mattdlam
                    Will double check the laser and revert, sorry for the stupid question,what will you suggest I use to clean the laser that will do a good job?
                    Damp cloth with alcohol. Do not dry wipe as wiping with a dry cloth leaves a small static charge and can attract dust/toner. Also----in light of the example you just posted, you can ignore the previous suggestion I made. There is no way you are exceeding 30 percent coverage , so the density drop on the edges is due to something else.
                    sigpicAnything can be made to work if you fiddle with it long enough- San Diego Copier Repair.com

                    Comment

                    • Mattdlam
                      Technician
                      • Apr 2013
                      • 32

                      #11
                      Re: Bizhub pro 920 print quality fading on edge of paper

                      Originally posted by blazebusiness
                      Damp cloth with alcohol. Do not dry wipe as wiping with a dry cloth leaves a small static charge and can attract dust/toner. Also----in light of the example you just posted, you can ignore the previous suggestion I made. There is no way you are exceeding 30 percent coverage , so the density drop on the edges is due to something else.
                      Thanks a lot for your guidance will try the latter and let you know how it goes, much appreciated.

                      Comment

                      • Mattdlam
                        Technician
                        • Apr 2013
                        • 32

                        #12
                        Re: Bizhub pro 920 print quality fading on edge of paper

                        Originally posted by blazebusiness
                        Damp cloth with alcohol. Do not dry wipe as wiping with a dry cloth leaves a small static charge and can attract dust/toner. Also----in light of the example you just posted, you can ignore the previous suggestion I made. There is no way you are exceeding 30 percent coverage , so the density drop on the edges is due to something else.
                        Thank you so much guys, I cleaned the laser glass with an alcohol solution and its printing perfect even more darker and defined, much appreciated!

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