Odd persistent banding issue with my DC 3535

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  • GusG
    Trusted Tech

    100+ Posts
    • Jul 2008
    • 198

    Odd persistent banding issue with my DC 3535

    Hi,
    I've got an issue with lines 90 degrees to the print direction (i.e. parallel with the drums), you can see them on the attachment (there's a magenta tinge in the yellow on the attachment, that was just a bad drum and not part of this issue). I guess it's what the service manual calls high frequency banding, it started becoming evident in black but now seems to be in all colours though still most evident in black.
    We've tried the following:

    - Checked the seating of RAM and NVM PWBs as well as for loose connections at ESS PWB (as the service manual recommends), this only resulted in the harddisk needing changing and the software put on, in fact changed several of these things from a spare 3535 I have with no luck
    - Changed the black developer unit 4 times when this was most noticeable in black, no change
    - Changed the ROS, same story. I have one other ROS I can try with but haven't yet

    Any ideas out there?

    Cheers,
    Gustav
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  • Scarecrow
    Trusted Tech

    Site Contributor
    100+ Posts
    • Oct 2010
    • 232

    #2
    Transfer belt? Cleaner?

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    • adriansto
      Service Manager

      Site Contributor
      VIP Subscriber
      1,000+ Posts
      • Nov 2007
      • 2305

      #3
      I think is a HVPS problem. Remove drums, belt assy and developer units and make a good clean. Be sure you clean the contacts very good. Try again to make test. If the defect is still there then change HVPS.

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      • GusG
        Trusted Tech

        100+ Posts
        • Jul 2008
        • 198

        #4
        Originally posted by adriansto
        I think is a HVPS problem. Remove drums, belt assy and developer units and make a good clean. Be sure you clean the contacts very good. Try again to make test. If the defect is still there then change HVPS.
        Thanks for the suggestion. I can't say for sure if my tech did clean all these bits when he's had the machine open to change the dev tank but he's usually quite good at that sort of thing, can't get him til Monday though. I did change the HVPS just now (from a spare 3535 that didn't have this issue when it was running) and that has not eliminated the problem though it appears to be ever so slightly better.
        Any other suggestions welcome

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        • adriansto
          Service Manager

          Site Contributor
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          1,000+ Posts
          • Nov 2007
          • 2305

          #5
          May be 2nd BTR assy.
          Make 15 copies of A3 or (8.5x11) paper with 4 color 70% selected.
          When near end of the run crash stop machine with the paper in fuser.Carefully remove the jammed sheet and examine IBT belt, the non transferred image on the belt should look ok, but the residual image left on the belt after transfer will have the bands visible, (the old 2nd BTR assembly will look perfectly ok).

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          • GusG
            Trusted Tech

            100+ Posts
            • Jul 2008
            • 198

            #6
            Originally posted by adriansto
            May be 2nd BTR assy.
            I'll have a look at that tomorrow. I've actually been suspecting the 2nd BTR as the problem is more pronounced the heavier the paper, virtually no problem on bond, so that would already indicate that the problem is not on the IBT

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            • adriansto
              Service Manager

              Site Contributor
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              1,000+ Posts
              • Nov 2007
              • 2305

              #7
              test.jpgBanding at 1.5 mm interval. Bad developer housing. most noticeable on heavyweight paper

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              • RockETop
                Curmudgeon at large

                100+ Posts
                • Apr 2007
                • 171

                #8
                Try your developer drive units. I don't know this machine, but have seen it on others.

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                • CT Copier Repair
                  Trusted Tech

                  250+ Posts
                  • Mar 2010
                  • 304

                  #9
                  Developer housings

                  seen it many times on DC's

                  then go for the 2nd BTR contacts and clean unit

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                  • GusG
                    Trusted Tech

                    100+ Posts
                    • Jul 2008
                    • 198

                    #10
                    Thanks for all your suggestions. I've tried changing the 2nd BTR with no luck, then I did the crash stop of a print as suggested by adriansto and the banding is evident on the IBT belt (I know I did this the wrong way around but I had to change the 2nd BTR anyway). The machine was thoroughly cleaned not so long ago but we may try to do that again.
                    About the developer units, I can't rule that out completely but we have changed the black one 4 times, although they were all used ones it seems unlikely that they should all be at the same level of "badness".
                    Any further suggestions?

                    Comment

                    • GusG
                      Trusted Tech

                      100+ Posts
                      • Jul 2008
                      • 198

                      #11
                      Now it gets weirder, we discovered that if we print some 10 sheets of each of CMYK solids then the lines disappear for some time.

                      We first noticed when we were printing several thousand A5s with very little toner coverage that after a while the prints started getting mottled, so we did the solid CMYK thing to try to force some toner through, the mottling disappeared as well as the lines.

                      There obviously still is a problem even if we've found a workaround, could it be tired developer material?

                      Comment

                      • adriansto
                        Service Manager

                        Site Contributor
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                        • Nov 2007
                        • 2305

                        #12
                        Do a good cleaning of the machine in particular the electrical contacts to de developer an IBT assy
                        Then run the MAXSETUP from service.

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                        • azehnali
                          Senior Tech

                          500+ Posts
                          • Nov 2009
                          • 679

                          #13
                          do you have the same issue from the glass?

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                          • GusG
                            Trusted Tech

                            100+ Posts
                            • Jul 2008
                            • 198

                            #14
                            Originally posted by azehnali
                            do you have the same issue from the glass?
                            Yes, it's the same

                            Comment

                            • RockETop
                              Curmudgeon at large

                              100+ Posts
                              • Apr 2007
                              • 171

                              #15
                              See above.... Try the developer DRIVE unit(s).

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