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Hey, I've got a KLH sw-12 powered subwoofer. Few years old. It doesn't work. Any ideas on how to test some things to check and see if anything is blown? I'm not an expert, to say the least, on electronics like this.

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  • certifiedcar Oct 16, 2009

    It's me again, Margaret. It's been a few weeks, but I did manage to check the board for anything and found some dark yellow, light brown marks around one of the capacitors (4700uF, I think--looks like 2 c-size batteries). You think that might be it?

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  • Master
  • 1,114 Answers

Pull the amp out of the cabonet and check the fuse first. Then look for visible brown marks on any of the electronics, which will at least point you in the right direction. If you can solder, you can fix it. Hope this helps. If you need further help, post a comment and I can help you troubleshoot more in depth.

Posted on Sep 26, 2009

  • Frank Fulton
    Frank Fulton Oct 16, 2009

    This will show you how to check the capacitors.

    FIRST: short the terminals to ensure it is not charged.
    Many of the digital meters today also have a capacitance check setting, simply use that setting. It not only checks for faults, but also will give you a reading of the capacitance value itself.
    For most non-electrolytic capacitors a quick check (definately bad vs. maybe good) can be done with an analog VOM. Use the highest resistance scale to measure across the terminals. When first connected there should be a short needle jump that slowly drops back to infinity. Reverse the leads and do it again, should have the same effect. Any resistance highter than infinity indicates a shorted capacitor. Lack of needle jump may indicate an open capacitor (or one of very little capacitance).
    Electrolytics can also be checked with a VOM, but polarity must be observed, and the drop back to infinity may take a very long time.
    Alternatively, for electrolytics and larger capacitors is to charge them with a low voltage source (e.g. 9V battery) and measure with multimeter to see if they hold the charge. Hope this helps

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