SD-512 intermittently misfolding

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  • Aquatic
    Junior Member
    • Sep 2015
    • 3
    #1

    SD-512 intermittently misfolding

    I have a C754e with a FS-535 finisher and a SD-512. It seems to fold some half fold booklets either skewed or in the wrong place. Sometimes it will fold an inch from the lead edge or it would do a skewed fold close to midway down the page. It also seems to only begin to do this after about 100ish booklets. It did it after a 100, then 50 then every other one intermittently. paper path was clear, cleaned the plates, cleaned the rollers, updated firmware. Unfortunately the manual doesn't list much but the adjustments. The machine has a little over 1mil copies, and the paper is run from tray 1. Anyone run into this or have any ideas?
    Tags: fs-535, misfold, sd-512
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22865
      #2
      Re: SD-512 intermittently misfolding

      Not just this saddle stitcher, but on others, the most important thing seems to be getting the paper tray guides snugly on the paper, and displaying the correct paper size. If the guides are loose by 3mm it will skew and jam constantly. If it's displaying paper size CUSTOM or any other paper size it will jam in the saddle stitcher. What media type, gloss? =^..^=
      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

        • Aquatic
          Junior Member
          • Sep 2015
          • 3
          #3
          Re: SD-512 intermittently misfolding

          Originally posted by blackcat4866
          Not just this saddle stitcher, but on others, the most important thing seems to be getting the paper tray guides snugly on the paper, and displaying the correct paper size. If the guides are loose by 3mm it will skew and jam constantly. If it's displaying paper size CUSTOM or any other paper size it will jam in the saddle stitcher. What media type, gloss? =^..^=
          I checked the tray and loaded a fresh ream of paper myself. The guides were snug. The paper was Boise X-9 plain copy paper.

            Comment

            • tech51
              Senior Tech

              500+ Posts
              • Jan 2009
              • 846
              #4
              Re: SD-512 intermittently misfolding

              Check the two mylars that guide the paper down into the stacker. They are the ones that sit just above the paddles that pull the paper down.
              I had one with a split in it that caused all of your symptoms plus jamming in my case.
              The split was very difficult to see, but once repaired the unit ran flawlessly.
              There is also a mod for the paper gripper that the paper drives into.

                Comment

                • Gaffers01
                  Trusted Tech

                  Site Contributor
                  250+ Posts
                  • May 2011
                  • 332
                  #5
                  Re: SD-512 intermittently misfolding

                  Yep I second the Mylars, when I get this problem I always replace these mylars.
                  They often look fine when inside the machine.

                    Comment

                    • EarthKmTech
                      Step aside, noob

                      1,000+ Posts
                      • May 2009
                      • 2142
                      #6
                      Re: SD-512 intermittently misfolding

                      Originally posted by tech51
                      Check the two mylars that guide the paper down into the stacker. They are the ones that sit just above the paddles that pull the paper down.
                      I had one with a split in it that caused all of your symptoms plus jamming in my case.
                      The split was very difficult to see, but once repaired the unit ran flawlessly.
                      There is also a mod for the paper gripper that the paper drives into.
                      do you have info on this gripper mod ?

                      I've had some techs rebuild that gripper section which has fixed some issues in the past.

                        Comment

                        • nullskull
                          Learning

                          250+ Posts
                          • Aug 2023
                          • 381
                          #7
                          Re: SD-512 intermittently misfolding

                          Originally posted by tech51
                          Check the two mylars that guide the paper down into the stacker. They are the ones that sit just above the paddles that pull the paper down.
                          I had one with a split in it that caused all of your symptoms plus jamming in my case.
                          The split was very difficult to see, but once repaired the unit ran flawlessly.
                          There is also a mod for the paper gripper that the paper drives into.
                          Hello i know this is an old thread but would you happen to have a picture of where these mylars are located?

                            Comment

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