KM-1650 & KM-2050 - image compression

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  • eddie_tm
    • May 2025
    #1

    KM-1650 & KM-2050 - image compression

    Need help.
    Have two devices (1650 and 2050) - counters: 410000 and 350000; drums: 5000 and 110000; fixing section didn't change.
    Defect of compression across paper by a strip with thickness up to 5 mm..... It is more often shown "shortly" (for 1-5 sm) near the trailing edge, sometimes in the middle (conditionally) of the sheet....
    Defect isn't shown on each sheet...
    Some scans of the issue:
    Grid (at the left - trailing edge, А4): http://www.e1.ru/fun/photo/view_pic....631fa/view.pic
    Report (in the middle, А4): http://www.e1.ru/fun/photo/view_pic....32c4b/view.pic
    Printing (at the left - trailing edge, А3): http://www.e1.ru/fun/photo/view_pic....9cb69/view.pic
    PS: lsu, fixing section , alas, isn't possible to throw from other devices...
    PPS: Has changed FILM RIGHT TRANS A (to self-made - the old one was all in waves) - a film on a GUIDE TRANS RIGHT between registration and a drum. Without effect...
    PPPS: when reducing REG motor speed, defect seems to appear less often, but appears in different places. When increasing speed, defect appears in the same place, but becomes more solid



    sorry for my russian-english
    Tags: None
    • james1701
      Technician
      • Nov 2011
      • 18
      #2
      Re: KM-1650 & KM-2050 - image compression

      I had a similar issue a long time ago on a machine so im am relying on fuzzy logic right now, lol.. Anyway I printed out all the machine settings first and then went into the options and did the copier reset back to factory default and that helped me out. Also make copies from by-pass and see if problem goes away. By using the by-pass and eliminating the paper trays you can narrow down where to look a little better. I would try this first before doing the settings reset. Hope this helps.

        Comment

        • blackcat4866
          Master Of The Obvious

          Site Contributor
          10,000+ Posts
          • Jul 2007
          • 22929
          #3
          Re: KM-1650 & KM-2050 - image compression

          How about focusing on the registration section? I'd start by cleaning and lubricating registration bushings, clean registration roller with Rubber Rejuvenator, and replacing the registration clutch.

          You've ruled out the common cause, scanning. The glides on light source #1 can become unsnapped, causing light source #1 to drag against the underside of the contact glass. =^..^=
          Last edited by blackcat4866; 12-16-2011, 12:23 AM.
          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

            • james1701
              Technician
              • Nov 2011
              • 18
              #4
              Re: KM-1650 & KM-2050 - image compression

              Good call on reg clutch , I had that happen once, thought it was a fluke. As for the scanner glides I havnt seen that one yet , but I have a couple machines getting high up in copy count, will keep an eye peeled.Thanks for that little piece of info Black cat, I hope it helps this guy out though.
              Later...

                Comment

                • blackcat4866
                  Master Of The Obvious

                  Site Contributor
                  10,000+ Posts
                  • Jul 2007
                  • 22929
                  #5
                  Re: KM-1650 & KM-2050 - image compression

                  Off Topic: An interesting side affect of those glides coming unsnapped is blank prints through the DP. Light source #1 tips just enough to mis-align the optics through the slit glass. You can get the same effect if the scan rail gets dry. Light source #1 can drag a little on the rail tipping the mirror at the end of the travel (under the slit glass). =^..^=
                  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

                    • eddie_tm
                      #6
                      Re: KM-1650 & KM-2050 - image compression

                      This issue comes up when making copies(printing, making test reports) from all trays, so it's not because of them. And this does not come from scanning section.

                      About reg clutch: there's no clutch - there is Registration Motor.

                      About factory defaults - will try...
                      Last edited by Guest; 12-16-2011, 11:59 AM.

                        Comment

                        • copiman
                          Technician

                          500+ Posts
                          • Sep 2011
                          • 861
                          #7
                          Re: KM-1650 & KM-2050 - image compression

                          Not real familiar with this manufacture, but in others I have seen this to be a hesitation in the transport of paper. Blackcat is right on. One other thing you may want to look at is the entrance to the fuser. Something like a dirty entrance guide or swollen pressure roller can cause a slight hesitation. Let us know what you find.

                            Comment

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