KM-3252ci black only banding issue crossfeed

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  • blackcat4866
    Master Of The Obvious

    Site Contributor
    10,000+ Posts
    • Jul 2007
    • 22702
    #1

    KM-3252ci black only banding issue crossfeed

    That's about it.

    When this issue occurred it was a little early for the Maintenance Kit A, but one of our techs did it anyway. Since then its had two DV-8350K's and two DK-8350's, and the issue seems to go away for awhile. This is my first time seeing the machine. There is a distinct negative of heavy fill areas 94mm further down the page.

    It's possible that the problem hides in low density halftones as you can see in my 11% fill ANSI B image. The sample I was given has intervals at 37mm, implying primary charge. But the 11% halftone shows intervals at 37mm (primary charge), 45mm (developer spacers), and 94mm (drum). No other color is affected. I can swap in one of the other drums, and the halftone changes density a little, but for the most part the problem remains unchanged. Occasionally just removing a unit and re-inserting clears it up for a dozen or so prints, then the next job has the bands. Cleaning lamps are lighting properly, and drum ground is being made.

    The hotline suggested the HVT, which sorta makes sense (affecting charge and developer bias for a single color). I've got that and another DV-8350K on order.

    KM3252ci banding1.jpgKM3252ci banding2.jpg

    Does this look familiar? =^..^=
    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: charge, density, drum, halftone, issue
    • Ropariva
      Senior Tech

      500+ Posts
      • Mar 2016
      • 591
      #2

        Comment

        • blackcat4866
          Master Of The Obvious

          Site Contributor
          10,000+ Posts
          • Jul 2007
          • 22702
          #3
          Re: KM-3252ci black only banding issue crossfeed

          It looks similar, doesn't it? =^..^=
          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

            • JR2ALTA
              Service Manager

              Site Contributor
              1,000+ Posts
              • Feb 2010
              • 2017
              #4
              Re: KM-3252ci black only banding issue crossfeed

              Yes this looks familiar. I'd ask you to look at your U000 report and tell me if the machine has recognized any of the new black drums/devs SIMS 110,158.

              I suspect not. If you installl a drum or dev and you don't see the machine going into a "adjusting image" for several minutes, it's probably not being recognized and then the process control gets out of whack.

              Believe it or not these boxes really do need to be unplugged when preforming maintenance.

              If my premise is correct; go back with new drum/dev UNPLUG, install and see what happens.
              Attached Files

                Comment

                • Luther
                  Senior Tech

                  500+ Posts
                  • May 2006
                  • 682
                  #5
                  Re: KM-3252ci black only banding issue crossfeed

                  I would go with the HVT, I had the same issue but it was with all the colors except black same spacing of the image

                    Comment

                    • BillyCarpenter
                      Field Supervisor

                      Site Contributor
                      VIP Subscriber
                      10,000+ Posts
                      • Aug 2020
                      • 14755
                      #6
                      Re: KM-3252ci black only banding issue crossfeed

                      Originally posted by JR2ALTA
                      Yes this looks familiar. I'd ask you to look at your U000 report and tell me if the machine has recognized any of the new black drums/devs SIMS 110,158.

                      I suspect not. If you installl a drum or dev and you don't see the machine going into a "adjusting image" for several minutes, it's probably not being recognized and then the process control gets out of whack.

                      Believe it or not these boxes really do need to be unplugged when preforming maintenance.

                      If my premise is correct; go back with new drum/dev UNPLUG, install and see what happens.

                      That's definitely worth exploring. I've made it a habit to unplug the machine on every service call if there's any disassembly to be done. That way I know when I do a PM that the machine will be unplugged.
                      Adversity temporarily visits a strong man but stays with the weak for a lifetime.

                        Comment

                        • blackcat4866
                          Master Of The Obvious

                          Site Contributor
                          10,000+ Posts
                          • Jul 2007
                          • 22702
                          #7
                          Re: KM-3252ci black only banding issue crossfeed

                          Thanks everyone. I'll let you know how it goes. =^..^=
                          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

                            • tee
                              Technician

                              50+ Posts
                              • Aug 2014
                              • 79
                              #8
                              Re: KM-3252ci black only banding issue crossfeed

                              I would make sure that the secondary transfer roller isn't the source of
                              the high voltage crossover. It has been the source of problems like this for me.
                              Kyocera thinks developer gets into the 2nd roller from bad dv unit. I'm checking
                              it first on all 3252ci's.

                                Comment

                                • tcook
                                  Technician
                                  • Apr 2013
                                  • 37
                                  #9
                                  Re: KM-3252ci black only banding issue crossfeed

                                  Our rep was in earlier this week on another issue, but told us about a problem he'd seen a couple of times. The symptom was more light overall image, but the fix was to pull the waste box assembly and reseat it. Apparently the high voltage contacts route through the assembly. Reseating it realigns the springs.

                                    Comment

                                    • blackcat4866
                                      Master Of The Obvious

                                      Site Contributor
                                      10,000+ Posts
                                      • Jul 2007
                                      • 22702
                                      #10
                                      Re: KM-3252ci black only banding issue crossfeed

                                      Originally posted by tcook
                                      Our rep was in earlier this week on another issue, but told us about a problem he'd seen a couple of times. The symptom was more light overall image, but the fix was to pull the waste box assembly and reseat it. Apparently the high voltage contacts route through the assembly. Reseating it realigns the springs.
                                      It sounds like this might not be a simple process.

                                      I'll add it to my list. =^..^=
                                      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

                                        • JR2ALTA
                                          Service Manager

                                          Site Contributor
                                          1,000+ Posts
                                          • Feb 2010
                                          • 2017
                                          #11
                                          Re: KM-3252ci black only banding issue crossfeed

                                          Where consumable counts accurate in the U000 report?

                                            Comment

                                            • blackcat4866
                                              Master Of The Obvious

                                              Site Contributor
                                              10,000+ Posts
                                              • Jul 2007
                                              • 22702
                                              #12
                                              Re: KM-3252ci black only banding issue crossfeed

                                              No counts are not accurate. I got the story third hand, but a board had been replaced at one point and the total count had been lost. The consumables had been replaced after that event, so those counts are accurate. I believe there was a U021 All Clear at some point.

                                              I had considered the possibility that the U930 values were inaccurate, and it was causing inaccurate calibration calculations, but I have been reassured that consumables were changed and reset AFTER.
                                              =^..^=
                                              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

                                                • allan
                                                  RTFM!!

                                                  5,000+ Posts
                                                  • Apr 2010
                                                  • 5445
                                                  #13
                                                  Re: KM-3252ci black only banding issue crossfeed

                                                  Looks like 2 things not happening correctly. Leaking charge current and not discharging.
                                                  If not a component problem on the HVT then a wonky contact somewhere.
                                                  Whatever

                                                    Comment

                                                    • JR2ALTA
                                                      Service Manager

                                                      Site Contributor
                                                      1,000+ Posts
                                                      • Feb 2010
                                                      • 2017
                                                      #14
                                                      Re: KM-3252ci black only banding issue crossfeed

                                                      Originally posted by blackcat4866
                                                      No counts are not accurate. I got the story third hand, but a board had been replaced at one point and the total count had been lost. The consumables had been replaced after that event, so those counts are accurate. I believe there was a U021 All Clear at some point.

                                                      I had considered the possibility that the U930 values were inaccurate, and it was causing inaccurate calibration calculations, but I have been reassured that consumables were changed and reset AFTER.
                                                      =^..^=
                                                      OK, for what it's worth I went down the 930 path as well. After a second PM kit, image PWB and HV PWB I was still stuck. Copies would be good for a few days or weeks.

                                                      My kyo rep quickly spotted the 110,158 counts were not being reset putting the machine in a process control death spiral.

                                                      I hope this info and ultimately your solution can help others in the future.

                                                        Comment

                                                        • Ropariva
                                                          Senior Tech

                                                          500+ Posts
                                                          • Mar 2016
                                                          • 591
                                                          #15
                                                          Re: KM-3252ci black only banding issue crossfeed

                                                          Is this a case of the consumables being changed with the power on? Only 930 needs to be reset after a drum change. All other counts are automatic....as long as the machine is powered off.

                                                            Comment

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