AR-M350 ADU trouble

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  • racer4242
    • Jul 2025

    #1

    AR-M350 ADU trouble

    I've had this machine with a sticky ADU entry sensor lever. This misfeeds had become intolerable last night so I took the unit off to see if I could fix the lever pivot. When I saw that getting to the lever was going to be a lot of disassembly I decided to just grab the ADU off my M450 machine that I have been robbing parts from. After pluging it in the display showed 'misfeed' and two of the paper path sensors show they are stuck 'on' when I do SIM 9-2.

    The unit worked fine before, so I thought maybe you can't just swap them.
    I decided to just fix the original unit with the sticky sensor.

    When I reinstalled the repaired ADU I get the same sensors stuck in this unit also! The door switch and the lower paper turn sensor work fine.

    I don't see any bent pins on the connector. I'm going to look harder today, but any tips would be greatly appreciated.
  • harleyrider
    Trusted Tech

    250+ Posts
    • Oct 2011
    • 348

    #2
    Re: AR-M350 ADU trouble

    put one more wrap on the spring of the actuator to keep it from bouncing or sticking.

    Comment

    • racer4242

      #3
      Re: AR-M350 ADU trouble

      Some more info:I put the M450 back together and both ADUs function normally in that machine.That means everything is good up to the point where it plugs into the main board.If something was wrong there how could it only affect two sensors?

      Comment

      • JustManuals
        Field Supervisor

        5,000+ Posts
        • Jan 2006
        • 9838

        #4
        Re: AR-M350 ADU trouble

        This Parts & Service Manual can now be purchased for $12.77 and downloaded immediately after payment from


        Just Manuals, The Internet's largest selection of manuals ~ Instant Downloads


        Paul@justmanuals.com

        Comment

        • Chr15tophe
          Technician
          • Dec 2011
          • 42

          #5
          Re: AR-M350 ADU trouble

          Think maybe youve blown a fuse on the dc psu, believe fuse F3 is the one that controls the ADU / left door

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