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Th-R1 no pwoer to subwoofer - transformer u/s?

We have no power going to the subwoofer. Checked the plug fuse and the 3 internal fuses, they are all ok. My father checked and reccons it could be the transformer.

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  • philbeaumont Oct 14, 2007

    how do i fix the transformer?

  • jefffirth Jun 01, 2008

    same problem - sound like I need a transformer. Where can I get it from?
    Jeff


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My power goes to the subwoofer and the little green light comes on for just a second and the you hear a click sound and the subwoofer power goes out. I have the JVC DVD Digital Cinema System TH-C90. Can you please help???

Posted on Nov 13, 2008

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It is the transformer..fix it and everything will be fine!

Posted on Oct 14, 2007

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Hello, To test the subwoofer when the blue light is on if you apply your thumb to the end of the subwoofer cable (the end that you would plug into the receiver) there should be feedback from the sub. If there is no feedback then the sub is not working correctly. Thanks, FJD

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Normally, that is the one first to be BUSTED before everything else?
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Powered Subwoofer repair--- Transformer issues?


Well yes transformers do fail and the transformer does say it has an internal fuse fitted which might have failed. The fuse on the board blowing is an indication of overload. The fact it didn't blow again shows that it is not getting any power or the fault has gone (doubtfull).
I doubt the transformer is a step up. But follow the circuit on the pc board till you come to electroytic capicator. This will have a voltage on it. The power level will be no more and perhaps less than the voltage on the capacitor. Another clue to the power level is if the secondary wires are narrower than those that go to the mains. That will indicate that less voltage comes out.
OK what to do. Well most makers say that the transformer is a safety item so it has to be replaced with the same type or one which is approved by the maker. So you can either contact the maker direct or find a service center, (for the brand) which might order you a replacement, or take the transformer to Radio Shack with details of the model number of the Sub, and see if they can get it for you. While there have a look at the multimeters. You should find one that will help you for all your future needs. I recomend one with a scale (rather than a digital). They are some around for £10 to £20 (I know you live in the USA but you can convert it) that will do what you might need it for.
The first thing to do if you get a meter is check with the ohm setting diodes or bridge rectifiers for shorts. IE: as if you had touch both probes together! Also do the same with any transitors you might find. As this could be the cause of the fuse blowing, and even the transformer's failure.

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sounds as if the internal fuse as gone look and replace ?

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