8508A blur image

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  • Rusty.Harris
    Senior Tech

    Site Contributor
    500+ Posts
    • Jan 2021
    • 620
    #1

    8508A blur image

    Tech brought me one. This ONLY happens in letter-r mode.
    Letter mode is perfect.
    Image, from lead edge to about halfway looks fine. From half way to the tail, it's similar
    to a double image. A ghost of the image is raised above the normal image.

    My guess is the speed of the fuser & the alignment roller is a bit off. Lower fuser swelled
    up a bit, changing the speed timing of the fuser?
    The lead edge of the letter-r paper is in the nip of the fuser and the rest of the paper is
    still in contact with the alignment roller & transfer belt.

    He's taking another fuser out tomorrow to check it.

    DOC092221-09222021124543.jpg
    Tags: 8508a, alignment, blur, fuser, image
    • MarkG52
      Technician
      • Oct 2017
      • 29
      #2
      Re: 8508A blur image

      I think you are spot on Rusty.
      Last edited by MarkG52; 09-22-2021, 07:49 PM. Reason: misspelling

        Comment

        • tsbservice
          Field tech

          Site Contributor
          5,000+ Posts
          • May 2007
          • 7971
          #3
          Re: 8508A blur image

          Originally posted by MarkG52
          I think you are spot on Rusty.
          +1 on this.
          Especially if distance between fuser entrance and second transfer equals distance from paper lead edge to where it started ghosting.
          A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.
          Blessed are they who can laugh at themselves, for they shall never cease to be amused.

            Comment

            • blackcat4866
              Master Of The Obvious

              Site Contributor
              10,000+ Posts
              • Jul 2007
              • 22997
              #4
              Re: 8508A blur image

              I agree. We've seen this on all the sleeve fusers. When the teflon sheet gets dry it slows the fuser drive. On this fuser you may also find worn or broken gears, or the fuser drive bushings difficult to turn with that nasty black grease Toshiba likes to use that turns to cement. Molycote HP500 or another high temp grease helps. We've had success re-oiling the teflon sheet with the original sleeve oil.

              When the fuser slows, the paper jiggles against the primary transfer belt at second transfer, blurring the image. It will start the distance from the second transfer to fuser, then clears up about 25mm from the trail edge, when the registration roller lets go.


              Do I have an image? Yes:

              eS4515AC Fuser Slow_1.jpg

              =^..^=
              If you'd like a serious answer to your request:
              1) demonstrate that you've read the manual
              2) demonstrate that you made some attempt to fix it.
              3) if you're going to ask about jams include the jam code.
              4) if you're going to ask about an error code include the error code.
              5) You are the person onsite. Only you can make observations.

              blackcat: Master Of The Obvious =^..^=

                Comment

                • Rusty.Harris
                  Senior Tech

                  Site Contributor
                  500+ Posts
                  • Jan 2021
                  • 620
                  #5
                  Re: 8508A blur image

                  Yep, looks pretty much like it. Told the tech, before you swap out the fuser, stop the machine before the paper moves from the
                  alignment roller & pull out the transfer belt and look at the image and see if it is clear.
                  When I put a letter paper against the nip of the fuser, the trail edge was clear of the alignment roller.
                  Pretty much sounds to me that the fuser is runnin' a bit slow. If that fixes it, when he brings it in for me to tear down, I'm gonna
                  measure the lower and see, plus, I've had some of that white Moly get caked up on the drive gear. I've told them til I'm blue in
                  the face to PULL that gear, clean the inside & the shaft, but it's like pissin' in the wind.



                  Originally posted by blackcat4866
                  I agree. We've seen this on all the sleeve fusers. When the teflon sheet gets dry it slows the fuser drive. On this fuser you may also find worn or broken gears, or the fuser drive bushings difficult to turn with that nasty black grease Toshiba likes to use that turns to cement. Molycote HP500 or another high temp grease helps. We've had success re-oiling the teflon sheet with the original sleeve oil.

                  When the fuser slows, the paper jiggles against the primary transfer belt at second transfer, blurring the image. It will start the distance from the second transfer to fuser, then clears up about 25mm from the trail edge, when the registration roller lets go.


                  Do I have an image? Yes:

                  [ATTACH=CONFIG]50212[/ATTACH]

                  =^..^=

                    Comment

                    • Blizzoo
                      Senior Tech

                      Site Contributor
                      500+ Posts
                      • Aug 2013
                      • 605
                      #6
                      Re: 8508A blur image

                      If belt it's ok replace the teflon sheet, add some oil and should be good to go. Pressure roller may get damaged depending how hard it worked against the belt
                      Defects are simple, our mind is complicated

                        Comment

                        • Rusty.Harris
                          Senior Tech

                          Site Contributor
                          500+ Posts
                          • Jan 2021
                          • 620
                          #7
                          Re: 8508A blur image

                          Well, it wasn't the fuser. I'm having the tech do the image dimsional adjustements...
                          You know the distance between the 1st & 20th, 2nd & bla bla bla.
                          I took a closer look under magnification, and you can barely see a bit of ghosting
                          toward the top.

                          I'm now thinking the laser is the issue, if the image adjustments don't pan out.

                            Comment

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