4505 in reboot mode

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  • Rusty.Harris
    Senior Tech

    Site Contributor
    500+ Posts
    • Jan 2021
    • 607
    #1

    [Electrical] 4505 in reboot mode

    Machine is in a reboot mode. He had already pulled/replaced
    the LVPS for some reason. I had him pull the power connector
    on the logic board, and the ribbon cables between system/logic
    and the machine rebooted into HS mode. (It wouldn't before).
    So he swapped out the logic, still didn't fix it.
    He pulled all the toner cartridges and the machine came to
    ready. Installed them one at a time, and it worked until he
    replaced the black and a few seconds later it started to reboot
    again. Tried 2-3 different OEM toners didn't fix it.

    He's still trying to track it down, but I'm guessing one of the
    contact springs on the inside frame for the toner detect board
    is bent, or there is a pinched wire harness from a zip tie somewhere.
    Tags: 4505, mode, reboot, toner
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22930
      #2
      Re: 4505 in reboot mode

      That is so interesting!!! Let us know when you get it pinned down. I think I would have started with formatting the HDD, then reloading firmware. The 5vdc line must be shorting out, disrupting the bootup procedure.

      That EEPROM contactor will be challenging to get to ... probably the easiest way will be removing the engine top cover and going in through the top. I don't know about you, but my arms are to big to stuff in through the drum/developing unit openings. All I end up with is scratches and bleeding. Or you can go in from the fuser side, black should be within reach. =^..^=
      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

        • Rusty.Harris
          Senior Tech

          Site Contributor
          500+ Posts
          • Jan 2021
          • 607
          #3
          Re: 4505 in reboot mode

          Tech has been doing field calls, hasn't had time to track it down. But, he sent me a video
          showing what it is doing. Never saw one do this before. I will DEFINATELY follow up once
          he tracks it down. Told him if it is something pinched/broken to take a photo, so I can
          post it.

          Oh, by the way it isn't a reboot, it's actually powering off, save for the power LED.
          Last edited by Rusty.Harris; 06-29-2022, 09:49 PM. Reason: more info

            Comment

            • Rusty.Harris
              Senior Tech

              Site Contributor
              500+ Posts
              • Jan 2021
              • 607
              #4
              tech tracked it down

              Bad fuser unit. He swapped out the fuser, and the problem disappeared.
              Put the old fuser back in, and it did it again.
              Something must have been whacky-doodle with the 5v line somewhere.
              Leave out the black toner cartridge, and it boots up fine, just says install
              black toner. Install black toner, few seconds later it shuts down?

              Anyway, there is your weird fix for the day!

                Comment

                • blackcat4866
                  Master Of The Obvious

                  Site Contributor
                  10,000+ Posts
                  • Jul 2007
                  • 22930
                  #5
                  Re: 4505 in reboot mode

                  Thanks for sharing! =^..^=
                  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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