Question about JBL PB10 Subwoofer

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Re: no power


Generally, if a fuse blows it is indicative of a fault with any of the components. If the fuse is on the AC side, then chances are it is the power supply, if it is on the DC side, then it is the amplifiers side.

I tend to suspect that you cannot find a replacement board. And if ever available from the manufacturer would probably cost just slightly less than buying a new set.

Your alternative is to seek the services of qualified audio technician who is willing to do component level repair. Circuit design would not differ much from basic amplifier hence replacement parts would reasonably be available versus entire PCB.

But then again, you must consider the cost/time of repair. If cost of repair plus downtime would not be to your liking, perhaps your best bet would be to purchase a new unit.

The cheapest alternative would be to do a DIY (do-it-yourself) which would require that you be familiar with basic electronics circuitry & components, use of & access to a DVM and use of a soldering iron.

Hope that this be of some help/idea. Pls post back how things turned out or should you need additional information.

Good luck and kind regards.

Posted on Nov 24, 2007

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Sub is blowing fuse

Isolate the power transformer from the circuit board, just to determine

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1501 sub will not power up. i opened, inpected and replaced power fuse 250v 6.3 amps replaced with same fuse and it blew as well immediately. what to do and how. I have some technical experience.

Isolate and look for possible shorted components.

Isolate the main power transformer from the board, and see if the

fuse still blow.

If it doesnt , then the rectifier and capacitors to the regulators.

But don't forget to check for possible shorted transistor

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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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1 Answer

The required fuse is 1.6 A / 125V an is blown, I wen to radio shack and bought a 1.6A/250V and it has blown 2 already, what can I do or check to fix it? This is a Sony Sub-woofer model sa-wmsp1.

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The line fuse blows on power up. Input impeadance to the power transformre is 3 ohms. Is this correct? seems low.

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