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Subwoofer Amplifier Repair Help!?

Discussion in 'Repairing Electronics' started by Lymmie, Jun 3, 2017.

  1. tomizett

    tomizett Active Member

    Aug 11, 2013
    Take a close look at those pots where the brown insulator board leaves the metal casing, and check carefully for any cracks that might have broken the circuit through the pot. This kind of damage is quite common if mechanical stress is put on the pot.
    Also, check carefully all the soldering and the traces (the copper paths) on the circuit board around the pots and the connectors - breaks in these areas are common, too, because of stress and vibration.
    If you're lucky it may just be a "mechanical" failure of this kind. Could be bad caps though, of course...

    Could you better describe the sound that it makes when no source is connected (to an engineer, "hum" and "noise" are two very different things!)? How does it perform with a source connected?

    Good luck, and kudos for having a go at it!
  2. ci139

    ci139 Active Member

    Apr 12, 2012
    also possible is a physical loudspeaker failure
    e.g. it (the cardboard/plastic) cracks from edge causing the cone go off the center (the audible symptoms would be somewhat similar)
    has happen once to me (saved 2 quite good permanent magnets from the wreck :confused:)

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