AR-208d high pitched whining noise

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  • axyun
    Service Manager

    Site Contributor
    1,000+ Posts
    • Aug 2007
    • 1323

    AR-208d high pitched whining noise

    A high pitched whining noise on Ar-208D sounds like fan. When machine is turned off the whining noise winds down gradually as though a fan slowing its rotation. Disconnected the exhaust fan but noise continues.
    Could it be from power supply? If it were charge unit I imagine it would stop immediately when power is turned off. Any help on this is appreciated. Frank/ActionPhotocopy
  • gwaddle
    Senior Tech

    500+ Posts
    • May 2009
    • 782

    #2
    My guess would be a laser unit getting ready to fail.
    I know I should be ashamed of myself. Strangely though, I am not.

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    • Dark Helmet
      Senior Tech

      Site Contributor
      VIP Subscriber
      500+ Posts
      • May 2009
      • 771

      #3
      Originally posted by gwaddle
      My guess would be a laser unit getting ready to fail.
      Ive heard the AR168's make a high pitched noise when the laser was failing. Use sim 25-10 to spin up the laser.
      Evil will always triumph because good is dumb.

      Comment

      • OMD-227

        #4
        Yeah, possibly noisy polygon motor in the LSU, but that would eventually wind down & stop as the machine entered power save modes, so it wouldn't be noisy all the time.
        Otherwise, if it sounds like a fan, run the fan sim test.
        If its more of a rattle noise, could be a loose cover somewhere, so as the LSU slows down, so does the internal machine vibrations.
        If its more of a high pitched squeal, I've seen plenty of DC power boards in my time have a dry capacitor onboard which causes this. As the power is turned off, the capacitor slowly releases its charge and can make this 'wind-down' noise in the process.
        I went to a clients one time for a 'squealing noise' call-out. As soon as I entered the door I could hear it, whereas 75% of the staff couldn't hear a thing. These 75% staff were all over 50 years old, those that could hear it were much younger. That proved something I had always heard about hearing loss of certain frequencies as we get older.

        Check power supply boards, fans, motors, covers, LSU. You will either replicate this in sim or it will be the power supply.

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        • axyun
          Service Manager

          Site Contributor
          1,000+ Posts
          • Aug 2007
          • 1323

          #5
          Thanks a lot guys. I thought that the noise might be coming from the power supply under the exits area but was not sure. The pologon motor test should help determine which is causing problem. Thanks for the extra info Warren. I guess if it is power supply I can do a board exchange. Frank

          Comment

          • axyun
            Service Manager

            Site Contributor
            1,000+ Posts
            • Aug 2007
            • 1323

            #6
            Did Sim 25/10 today which confirmed LSU is problem. Have not changed one on this model type yet. Have done many on AR-200 series, couple on old Al series and couple on AR-275 series. . Frank

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