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Subwoofer Module N-200 ( Nuance ) Short on circuit board

I have a Nuance subwoofer module N-200 with a short on the circuit board does any body know how to fix or replace the board.

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  • Anonymous Feb 24, 2008

    I have the same problem. Looking for a solution

  • the12thmann Nov 02, 2008

    I have the same problem, anyone had any luck in finding sa fix for this?

  • Cryoman Feb 14, 2009

    I have the same problem with both of my baby grands. If anyone out there has an answer, I would love to hear it.

  • dirty Dirk Apr 26, 2009

    cant keep power on my ciruit board no big sound

    subwoofer module n-300 (nuance).

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I'm working on a guys board looks like it is the Q10 and Q1 transistors I'll let you know how it goes.

Posted on Nov 20, 2008

  • Cailou
    Cailou Feb 14, 2016

    I have the same sub... Looks like q1 and q 10 are colpritts...did you have any luck finding and changing these transistors?

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I have for sure one working N-300 amplifier and maybe a second (Depends if I can repair it, I think I know the problem, just waiting for parts). I am willing to take offers. If interested email me at ak47_138@hotmail.com.

Posted on Dec 23, 2008

  • irongoddogg
    irongoddogg Oct 07, 2012

    my n 200 just went again so if you can help me out would be great call 780 700 6982

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Short circuited component/s at its circuit board. Check and replace it. Check for shorted component/s at the amplifier stage circuit. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

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Things You'll Need:

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Disconnect the speaker cable from the back of the Bose Accoustimass bass module and connect it to a subwoofer that is known to be working. If the subwoofer works, the bass module needs to be replaced.


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Connect a speaker cable that is known to be working between the back of the receiver or amplifier and the back of the Accoustimass module. If the module starts working, then the cable was the issue.


Disconnect the speaker cable from Step 3 from the back of the amplifier or receiver, then connect the cable to the subwoofer port on the back of an amplifier or receiver that is known to be working. If the subwoofer works, the receiver was the issue. If the subwoofer still does not work, verify that the speaker cable is in the subwoofer port of the receiver/amplifier and that the cable is connected securely to the subwoofer.



If you think you did the connection properly,Fine... If not you can use the manual from the below link and know how to connect it properly..

products.bose.com/pdf/customer_service/owners/og_am5iii.pdf


Have a nice day..

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1 Answer

Electrical short in the subwoofer


You're quite right when a fuse blows there's a short. The short will be in either the power supply section, or the main amp. You will be looking for a semi-conductor of some sort. A multi meter on the ohm setting will track it down quick if it's a transistor. As the meter scale will be just like you have touched the probes together. Follow the circuit back from the fuse. Check any part that you suspect. If the sub uses an IC power amp, it could be a strong suspect!

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Sorry to hear that. The JBL PB12 are notorious for their amplifier module giving out. This item is not repairable nor is there a replacement (The module is potted into an aluminum heat sink). Actually, I need to clarify, as the late models used discrete components. If this is the case, either Repair it yourself (Google search PB12 Repairs) or take it to the local repair shop. (Or to a technical college with an electronics program, they may work on it!)

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More likely to have shorted out Class D amplifier module that was badly designed.
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http://manuals.harman.com/JBL/HOM/Service%20Manual/PB12%20sm.pdf

I modified my using Linear Amp IC from TI, bot the same power but loud enough for me. http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/

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It sounds like your audio amplifer has a short (probably the out put transistors or module). This should not be an expensive epair.
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