Technics KN550 muting

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  • Tom41
    Badcaps Veteran
    • Oct 2005
    • 336
    • England
    #1

    Technics KN550 muting

    I have recently discovered my old Technics KN550 synth that I used to play on back in the 1990s. I powered it up and it still works, with one minor issue - the speakers don't make any sound! I can hear the output through the headphone jack, and while inserting and removing the headphones sometimes one of the speakers will crackle and turn on momentarily.

    I suspect this is an issue with the cutoff circuit that mutes the speakers when you plug in headphones; it's activating even when there are no headphones plugged in! Hopefully this would be an easy fix - any advice?
    You know there's something wrong when you open your PC and it has vented Rubycons...
    Tags: None
    • Andrew F. Ali
      Badcaps Legend
      • Jan 2014
      • 2450
      • Trinidad & Tobago
      #2
      Re: Technics KN550 muting

      The Headphones Jack needs replacing. The audio Output is working since you can hear thru the phones. Start with the easy thing--Replace the headphones jack.

        Comment

        • madan1
          Badcaps Veteran
          • Nov 2016
          • 682
          • Bulgaria
          #3
          Re: Technics KN550 muting

          Try spraying some contact cleaner in the audio jack. Wait to dry out before powering up the unit.

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