First case of developer burn in nearly a decade.

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  • blackcat4866
    Master Of The Obvious

    Site Contributor
    10,000+ Posts
    • Jul 2007
    • 22927
    #1

    First case of developer burn in nearly a decade.

    Back when I worked on Canon's we called it developer burn. Essentially, the developer spacers would wear or break (which they did a lot), then the drum would get close enough to the mag roller and arc. On the Canon's that meant pits in the ASi drum.

    Now to today. It's an e Studio 355, and I think I can re-construct the course of events:

    First call 4 days ago: Noise. Tech "adjusts dev unit"

    Second call: Bars of developer crossfeed. Replace drum and dev-kit.

    Third call: Bars of developer crossfeed. Replace drum, again.

    Fourth call: Bars of developer crossfeed. This one's me. The drum is clearly pitted at the machine rear, and the developer is piled up on the upper developer seal. What I think happened is that the developing roller started to wobble some, just due to normal wear and tear. When it wobbles the ribbed surface grazes the doctor blade making a really annoying cyclic sound. Rather than figuring out why the roller wobbles, tech #1 widens the doctor blade gap (significantly). Now the mag brush is nearly twice as high at the rear, same affect as moving the mag roller closer.

    Naturally, I don't have my feeler gauges (actually I can't remember the last time I used them), so I used a similarly highly precise method of adjusting the doctor blade: I turned the screw a 1/4 turn, then made some copies. When it got too close the noise returned. When I got fairly close to the correct adjustment the arcing stopped, drum ground bars gone, and jitters crossfeed now gone. The drum is still trashed, and I'd really like to see a new developing unit in there.

    Fifth call: Parts Available. Replace drum, again. The used replacement developing unit is worse that the first, so I stick with the first one now back in adjustment.

    ... and that's how an eS355 got three drums in three consecutive days, all because of a noise. =^..^=
    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: None
    • Luther
      Senior Tech

      500+ Posts
      • May 2006
      • 682
      #2
      Re: First case of developer burn in nearly a decade.

      It happened a lot on konicaminolta di350 series the rear spacer would wear and cause the same thing...how many copies on the effected machine?

        Comment

        • blackcat4866
          Master Of The Obvious

          Site Contributor
          10,000+ Posts
          • Jul 2007
          • 22927
          #3
          Re: First case of developer burn in nearly a decade.

          It's a refurb. 345K before the refurbish, 80K after, for a total of 425k. I've noticed that almost every 355/455 series machine makes this noise. Most techs assume it's the fuser, but if you touch the developing unit while it's cycling you can feel the vibration.

          The customer tells me the new drums lasted almost an hour before being developer burned. I guess it's time to locate my feeler gauges. =^..^=
          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

            • ss12
              Trusted Tech

              250+ Posts
              • Jul 2008
              • 289
              #4
              Re: First case of developer burn in nearly a decade.

              The rear spacer on the dev unit used to cause this issue as well

                Comment

                • Hansoon
                  Field Supervisor

                  Site Contributor
                  2,500+ Posts
                  • Sep 2007
                  • 3347
                  #5
                  Re: First case of developer burn in nearly a decade.

                  tech #1 widens the doctor blade gap (significantly). Now the mag brush is nearly twice as high at the rear, same affect
                  Pardon me please, you call that a "Tech"??

                  Hans
                  “ Sent from my Intel 80286 using MS-DOS 2.0 “
                  https://www.copytechnet.com/images/smilies/biggrin.png

                    Comment

                    • allan
                      RTFM!!

                      5,000+ Posts
                      • Apr 2010
                      • 5459
                      #6
                      Re: First case of developer burn in nearly a decade.

                      You call that guy a tweaker. I always check the doctor gap of good machines with 80gsm paper like some ricoh machies would be 7 sheets of paper for a proper gap.
                      Whatever

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