6235 can someone explain how the transfer voltage works

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  • fishleg
    Trusted Tech

    Site Contributor
    250+ Posts
    • Mar 2009
    • 426
    #1

    6235 can someone explain how the transfer voltage works

    Hi,

    I've got a machine with very faint copies. I can't understand the path of the secondary transfer voltage. There's 2 springs one is the earth for the discharge comb but the main voltage going to the transfer roller makes contact with plastic. How does the voltage go through that unless it is somehow conductive?

    I wish I took pictures to be honest at first I thought nah something has fallen off as I was expecting some kind of spring touching the transfer roller shaft but on these it's all plastic.

    Hard to explain but the bias spring with door shut connects to black plastic which is then connected to the transfer roller shaft. I'm fairly confident it's the hv board as I swapped the door with another machine to check and the image was perfectly fine on the belt.

    Screenshot_20210924-192528_Samsung capture~2.jpg
    Attached Files
    Tags: plastic, roller, spring, transfer, voltage
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22999
      #2
      Re: 6235 can someone explain how the transfer voltage works

      I used to have a photo .... sorry, I can't find it. There was a Gemini and a Mebius, in which the customer had slammed the rear cover hard enough to shatter the secondary transfer bushing that you have indicated.

      The plastic IS semi-conductive to make the secondary transfer connection. I personally, was worried that the epoxy that I used would act like an insulator, blocking the electrical connection. To my surprise, the epoxy was conductive enough to second transfer, and produced a nice image. And the bushing lasted the two weeks it took for the part to arrive. The one-piece intact bushing ohmed out at 1600 ohms. The epoxied part ohmed out at 5K ohms, but worked fine.

      Does that help? =^..^=
      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

        • fishleg
          Trusted Tech

          Site Contributor
          250+ Posts
          • Mar 2009
          • 426
          #3
          Re: 6235 can someone explain how the transfer voltage works

          Originally posted by blackcat4866
          I used to have a photo .... sorry, I can't find it. There was a Gemini and a Mebius, in which the customer had slammed the rear cover hard enough to shatter the secondary transfer bushing that you have indicated.

          The plastic IS semi-conductive to make the secondary transfer connection. I personally, was worried that the epoxy that I used would act like an insulator, blocking the electrical connection. To my surprise, the epoxy was conductive enough to second transfer, and produced a nice image. And the bushing lasted the two weeks it took for the part to arrive. The one-piece intact bushing ohmed out at 1600 ohms. The epoxied part ohmed out at 5K ohms, but worked fine.

          Does that help? =^..^=
          It does thank you. It really had me stumped I was thinking there has to be some thing missing. Never seen a machine that uses conductive plastic to do that. Kinda cool but very confusing when trying to trace it. I was using continuity test on my meter but I couldn't get it to bell didn't think to use resistance.

            Comment

            • blackcat4866
              Master Of The Obvious

              Site Contributor
              10,000+ Posts
              • Jul 2007
              • 22999
              #4
              Re: 6235 can someone explain how the transfer voltage works

              Originally posted by fishleg
              It does thank you. It really had me stumped I was thinking there has to be some thing missing. Never seen a machine that uses conductive plastic to do that. Kinda cool but very confusing when trying to trace it. I was using continuity test on my meter but I couldn't get it to bell didn't think to use resistance.
              I don't know about your meter, but on continuity my meter is only good up to 100ohms. =^..^=
              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

                • fishleg
                  Trusted Tech

                  Site Contributor
                  250+ Posts
                  • Mar 2009
                  • 426
                  #5
                  Re: 6235 can someone explain how the transfer voltage works

                  Originally posted by blackcat4866
                  I don't know about your meter, but on continuity my meter is only good up to 100ohms. =^..^=
                  Thanks again still learning. Sad but you know what I'll be doing when I go back lol curious what ohms it is..

                    Comment

                    • fishleg
                      Trusted Tech

                      Site Contributor
                      250+ Posts
                      • Mar 2009
                      • 426
                      #6
                      Re: 6235 can someone explain how the transfer voltage works

                      Originally posted by blackcat4866
                      I don't know about your meter, but on continuity my meter is only good up to 100ohms. =^..^=
                      I went back with a high voltage and it turns out it had a dead short to ground on the spring. I placed a bit of insulation tape behind the plastic the spring sits on behind high voltage and fired back up with old board copies back to normal. It must of had a hairline crack in the plastic.

                      Thanks again though would never have guessed the plastic was conductive I thought it was some kind of shield and I was missing some metal...

                        Comment

                        • blackcat4866
                          Master Of The Obvious

                          Site Contributor
                          10,000+ Posts
                          • Jul 2007
                          • 22999
                          #7
                          Re: 6235 can someone explain how the transfer voltage works

                          Congratulations on your success. =^..^=
                          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

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