Question about JBL PB10 Subwoofer

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  • Anonymous Jan 12, 2008

    amplifier blows fuses immediately



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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

  • Louie  Role
    Louie Role Dec 03, 2007

    Hi again,

    How's your sub? Any new development(s)?




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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

Sep 23, 2011 | Mackie SWA1501 Subwoofer

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The mains input fuse (4amp) and a (1amp) fuse on the main power out board were blown. Replaced fuses and switched on, blown again, disconnected output from transformer to main board (4amp) fuse did not...

The cheapest option is to replace the transistors (a quick check on google will tell you how much they are). If they are common transistors you will be able to find them and get them quicker then searching for a board that could be no longer being made.

Sep 02, 2010 | Mackie SWA1501 Subwoofer

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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.

Mar 23, 2010 | Onkyo SKW-200 Subwoofer

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.

If power transformer T1 got shorted or its output voltage got shorted for some reason, fuse will blow in Sony SA-WMSP1 active subwoofer.
Check power transformer, D401 bridge rectifiers and IC301 power amplifier out chip. Any of them is bad.
Let me know if you have additional question.

Jan 08, 2010 | JBL PSW-D110 Speaker

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Have the KLH ASW10-120 Powered Subwoofer and it is blowing fuses

If it stays on for 3 seconds then it probally is not the transformer. However it may very well be the power amp no way to tell untill we operate. Call Pro Line Music 215-736-8055

Dec 11, 2009 | KLH ASW10-120 Subwoofer

1 Answer

No Power

all sets must have rated fuse for protection. some units now use what is called a PICO-FUSE.this type of fuse is soldered into the pc board. usually marked with location i.d. F301,F901,F400. etc. these fuses look like resistors or in-line coils. check continuity w/ohm meter. if new fuse blows as soon as you plug in tv, suspect bridge diode ciruit or main filter cap(large ripple filter by main fuse. if new fuse blows when you try to turn on, suspect 130v regulator or high voltage short(horizontal-output, flyback transformer) good luck!

Feb 20, 2009 | Televison & Video

1 Answer

Jbl eon15p-1 my speaker it was working fine after 30 minuts wont turn on

Mine has a blown power supply transformer. There are 2 fuses on the power input board. One of the fuses on mine blows instantly because the primary on the tranformer has gone short cct. A $200 part from Jands !!!

Jan 07, 2009 | JBL Eon15P-1 Main / Stereo Speaker

1 Answer


What probably happened was both of the final audio output transistors shorted. This caused a higher than normal drain on the switching transistors on the primary side of the torrid power transformer causing one to short and then blowing the fuse. I replaced both switching transistors and ramped up the current to about 5 amps. I could see the power supply was not working but there was still a short. I traced the short to both audio output transistors. Replaced them and unit is like new. After I found a service manual on this item it was a breeze to find the problem.

Sep 19, 2008 | Infinity BASSLINK Car Subwoofer

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