DP-770 jamming and "eraser bits on originals"

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  • blackcat4866
    Master Of The Obvious

    Site Contributor
    10,000+ Posts
    • Jul 2007
    • 22973
    #1

    DP-770 jamming and "eraser bits on originals"

    Jam codes J9600, J9200, J9202

    The consequences are fairly obvious ...

    DP770-1.JPG

    ... but the cause isn't so obvious. I believe that the white plastic holder is inconsistently molded. The thing is, I don't think that a new part is going to be any more perfectly proportioned. Every one that I've looked at is subtly (or not so subtly) warped

    What I did is measure the distance across the longest part of the belt. At the left, I found 73.66mm. At the right I found 74.33mm. So there's no doubt why the belt is walking to one side, but what to do about it? I added a folded paper shim between the spring and shaft at the short side. You can see it in the photo. I don't know if there is a nice linear formula for calculating the thickness of the shim, but in this one case, to get 74mm even across belt the shim was 1.7mm.

    I believe a new feed belt is called for also.

    DP770-2.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 =^..^=
    Tags: None
    • tmaged
      Owner/Service Manager

      Site Contributor
      1,000+ Posts
      • Oct 2008
      • 1863
      #2
      Re: DP-770 jamming and "eraser bits on originals"

      201203_B463-3NV-0001s2a.pdf
      Looks like yours has the updated pulley. I'd look at the springs.
      Hope that helps !
      -Tony
      www.dtios.com
      Become a fan on Facebook

        Comment

        • habik
          Service Manager

          Site Contributor
          1,000+ Posts
          • Apr 2010
          • 2013
          #3
          Re: DP-770 jamming and "eraser bits on originals"

          Does the pulley shaft reach end clips of the holder/ass'y. I'd file it off. If the belt gets used and stretches a bit the stop hook might be uneven on one side.

          or as mentioned by Tmaged check the springs.. I wonder if they are :

          1: same lenght
          2: same strenght
          3: have nice flat bottom on each side. Those springs are bit beefy so the step of the end of spring turning, may slip and cause the spring to look side ways. I had it once on KM8030 ADF and was causing same issue. Springs are weird sometimes.
          .OK Google! ... will I need Berrocca this morning?
          Firmwares HERE

            Comment

            • Tonerkiller
              Senior Tech

              500+ Posts
              • Oct 2012
              • 665
              #4
              Re: DP-770 jamming and "eraser bits on originals"

              That is the problem you have an old style pulley. The new pulley does not have a ridge on it.

                Comment

                • blackcat4866
                  Master Of The Obvious

                  Site Contributor
                  10,000+ Posts
                  • Jul 2007
                  • 22973
                  #5
                  Re: DP-770 jamming and "eraser bits on originals"

                  Originally posted by tmaged
                  [ATTACH]27255[/ATTACH]
                  Looks like yours has the updated pulley. I'd look at the springs.
                  The first thing I did was swap the springs. The belt continued to ride to the left.
                  The second thing was to flip the big pulley (no ribs, by the way). It continued to ride left. (of course, you can't leave it that way, with the one-way bearing inside)
                  Third thing was to flip the small pulley. It began to ride to the right.

                  My conclusion was that there was something wonky about the small pulley. Either unevenly bored, or out of round, or uneven diameter. But the replacement part also rode the belt to the left.

                  Thanks for the bulletin, by the way. I'll probably order the updated pulley(s), but I doubt that it will make the belt ride much straighter.

                  Originally posted by habik
                  Does the pulley shaft reach end clips of the holder/ass'y. I'd file it off.
                  I don't understand what you're getting at. Does it show in the pictures? It the clips are on the shaft, the shaft must be the right length, correct?

                  Originally posted by habik
                  If the belt gets used and stretches a bit the stop hook might be uneven on one side.
                  If you're referring to the beige molded holder, the hooks are intact. I have seen them deformed or broken off in other applications.

                  Originally posted by habik
                  ... or as mentioned by Tmaged check the springs.. I wonder if they are :

                  1: same length
                  2: same strength
                  3: have nice flat bottom on each side. Those springs are bit beefy so the step of the end of spring turning, may slip and cause the spring to look side ways. I had it once on KM8030 ADF and was causing same issue. Springs are weird sometimes.
                  The springs are quite beefy for such a small application, but when I swapped them and the belt continued to ride left, I concluded that the springs were similar enough. Once I've done the shim thing a few times, I should be able to come up with a nice neat formula to predict the size of the shim.

                  I appreciate your comments. Thanks. =^..^=
                  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

                    • habik
                      Service Manager

                      Site Contributor
                      1,000+ Posts
                      • Apr 2010
                      • 2013
                      #6
                      Re: DP-770 jamming and "eraser bits on originals"

                      OK. I meant the beige plastic hook end stopping the pulley from coming "off" if per say the belt snapped off completely.

                      How about the separation ? Any signs of bad tracking of the belt? Then causing stretching/ driving just one side of the belt harded. Just a bit of lateral thoughts.


                      Sent from my iDon't believe in marketing device using Tapatalk
                      .OK Google! ... will I need Berrocca this morning?
                      Firmwares HERE

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