Question about JBL PSW-D112 Speaker

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Blows fuses My sub stoped working. dead, no sound, no LEDs nothing. I opened back & fuse was blown, so I replaced it. Put it together & turned it on w/ no cords connected & it makes a humming sound for about a second & goes dead (blowing the fuse). I tried again & same result. What could it be? What should I do?

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Re: Blows fuses

I found a post where someone replaced several capacitors with ones he described as titanium and a higher voltage like 100 v rating rather than 50 as oem. He states no more problems. I found this site while searching again. I also found a free download pdf repair manual from JBL - site defined as Harmon, and they show revised parts replacements for these caps - 100 volt. I just bought a used one and not hooked up as yet, but I plan to use slow blow fuses and possibly a little higher rating - not much though, and I believe there is a ceramic type - color solid white - that may withstand the apparant surge. Theres also a recent post somewhere for sale of the amplifer board... 64smi or something like that. Hope this helps. Ken

Posted on Mar 24, 2007

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To check your speaker you can use an ohm meter. First, pull of one of the two wires that connects at the speaker. You should read 4 to 8 Ohms. Also you will hear a little pop through the speaker as you touch the wire. You can also use a 9 volt battery in the same way.
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Fuse blows

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It could be that the subwoofer is blowing the fuse because the one you installed was not slow blow.

But, more likely is the subwoofer has a short in the power supply which is causing the fuse to blow.

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The fix could be simple, but without seeing the unit, I can not state that for sure.

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