Question about JBL PB12 Subwoofer

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Jbl PB12 powered sub woofer

My subwoofer lights flicker on the front green/red/green. Also a clicking sound. It smelled like an electrical burn of some sort. no power surge. I took out the board and their is a black burn spot on the board. Can it be repaired? Thank you, Daryl

Posted by daryl schaefer on

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1 Answer

Anonymous

If your serial number starts with ha then it's probably a bad capacitor C72 . 6.8uf 100v np electrolytic. replace it with a higher voltage capacitor of the same value.

Posted on Jan 05, 2008

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1 Answer

JBL PB12 will have loud thump or pop!
First try to find the source of your problem. The easiest way would be to try your sub with a different audio source to see if the problem still occurs but is sounds more like there's a problem with the receiver.

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I have a JBL subwoofer and it the green light keeps flickering red , the sound is mimimal and if i turn it up it pops n cuts out , unable to get much volume from the speaker.
You can download the service manuals here and read the service bulletin and check per manual.
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf

http://manuals.harman.com/JBL/HOM/Service%20Manual/PB12%20sm.pdf

Hopefully the ClassD module is not bad.
This is what I have done to my: http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/

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1 Answer

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Service manuals: http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf
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My ClassD module shorted out (buzzing sound/blown fuse) and not availabled any more so this is what I did: http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/
I would suggest to buy new one.

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More likely to be the Class D power amp module, but you should look through the service manual to make sure all the parts are installed correctly. My PB10 AMP module went out and you cannot get one anymore.
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf

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yes it can be repaired. but i need more details on this...

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These subs have had many problems, all associated with the amplifier section. PB 12's with an "M" as part of the ser. no. were assembled in Mexico and these are the ones with the amp problems. JBL fixed mine and sent it back no charge, BUT it cost me nearly $100 to send it to them in the first place. I have another one that has had no problems at all. Try sending it back for repair. At best you'll get a rebuilt unit back, at worst a substantial discount from the company for a new sub.

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