Question about JBL PB12 Subwoofer

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Finding Parts for a JBL PB10

My JBL PB10 has several burned out resistors and diods. The Technician I have been working wiht has tracked down 6 of them but there are still 4 more that he cannot find. The location #s are: R6, R9, R10 and D9 on the circuit board. Can you let me know if there is a specific part number for each and where I might be able to purchase them. If you can track down a schematic that would be helpful as well.

Thank you!

Brian

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  • Anonymous Apr 15, 2008

    With the cable from the signal source (receiver) disconnected, there is squeal/chirp/noise from the speaker. If you lightly touch the speaker cone, noise stops but immediately returns when finger is removed. Is this in the JBL electronics or the 12" speaker? Can I fix it? Where are parts? Or is it now a $400. piece of scrap?

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For JBL parts and service use the link below.

http://www.jblpro.com/contact/form_dir.html

Depending on the type of parts, JBL usualy only sells the complete boards. For some of their products it is dealer service only, meaning that you have to give the unit to their rep for service. Normaly these units are serviced by circuit board swap.

For the question about the unit that is making a noise, I have had this caused by electrolytic capacitors that became off value from age. You can use an ESR meter to test all the capacitors in the unit. Change all the caps that are out of spec.

If you are not used to doing this type of service, I suggest to give the unit out to the manufacture rep for service.

Jerry G.


Posted on Apr 28, 2008

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It blows the fuse because a semiconductor device has developed a short (in otherwords acting like it was just a piece of wire). Because of the noise I would suspect the main amp device is the cause. It will be most likely on a heatsink.

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http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf

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Thump at the time of shutoff


The amplifier in the sub as with any other amplifier has a capacitor in it. Essentially a battery that holds a charge. When you trun things off such as subs or amps with a powerstrip instead of the intended on off button, the power supply has been cut, but the capacitor is still energizing the unit. So it catches the noise in the line.

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