IR8070 gray background after multiple copies

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  • majickmerlyn2
    • May 2025
    #1

    [CQ] IR8070 gray background after multiple copies

    Help!

    I have a Canon IR8070 at a customer account that is giving me fits. When making multiple images, the copies start off crisp and white. After about 15 or so images, there starts to be a gray background image that looks like corona being turned up too high on a IR5000. When I first noticed this issue, I went for what I thought was obvious, I replaced the primary corona unit and when that did not fix it, I replaced the development unit. The problem went away for a few days, then returned. Second round, I replaced the cleaning blade, vaccumed out all the excess toner, recoated the cleaning roller with new toner, replaced the pre-transer corona, replaced the transfer corona, and polished the drum. The issue has returned to day and the law firm the copier belongs to is getting antsy... Copier only has 1.3 million copies on it. I believe that this copier is write to black, which I do not have much experience on.

    Any suggestions would be appreciated.

    Jeremy Sweeney
    Master Technician
    Ricoh-USA
    Tags: black, canon, copier, copies, customer, tech, toner, transfer, unit
    • zoraldinho
      teacher-guide-expert-guru

      Site Contributor
      2,500+ Posts
      • Mar 2008
      • 4999
      #2
      Re: IR8070 gray background after multiple copies

      Do you have still a problem if you turn off a potencial sensor?
      Do you have last firmware installed?

      Post a picture please.
      Last edited by zoraldinho; 11-19-2011, 05:08 PM.
      If it ain't broke, don't fix it
      A picture is worth a thousand words

        Comment

        • vigour
          Service Manager

          1,000+ Posts
          • Aug 2010
          • 1038
          #3
          Re: IR8070 gray background after multiple copies

          are they using genuine toner?

            Comment

            • charm5496
              Service Manager

              Site Contributor
              1,000+ Posts
              • Apr 2008
              • 2387
              #4
              He works for ricoh so I doubt that it is Canon OEM toner.
              Accidents don't just happen. They must be carelessly planned.

                Comment

                • Herrmann
                  Senior Tech

                  Site Contributor
                  500+ Posts
                  • Jan 2006
                  • 792
                  #5
                  Re: IR8070 gray background after multiple copies

                  First at all, you have to sort out if it is a laser or a charging issue.
                  Tape the dust shield glass with black tape 1cm and do the multicopy again, what happens?
                  If sometimes you feel a little useless, offended and depressed always remember that you were once the fastest and most victorious sperm of hundreds of millions!

                    Comment

                    • majickmerlyn2
                      #6
                      Re: IR8070 gray background after multiple copies

                      Thanks to all who posted on this thread. I did isolate that it was a charge issue. Taping the shield glass did not change my issue. I also tried the to turn the sensor off, to no avail. After a new dev unit, new drum, and some other headaches later, I found that I put in another primary corona unit, and the issue was gone. The primary corona unit that I had installed previously was rebuilt.

                      Interesting thing that threw me on this model is that it is write to black. If the same issue were happening on an IR5000, you would have seen light areas not dark.

                      Cheers!

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