20 Most Recent JBL PB12 Subwoofer Questions & Answers

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Service manual

Be the first to answer 2/3/2014 3:52:37 AM • JBL PB12... • Posted on Feb 03, 2014Be the first to answer
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manual
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I blew the circuit board on my jbl pb12 subwoofer.

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!)

The best method is looking for a plate amp to replace the PB12 Amplifier - try the bash 300W. Several people have done this conversion. Be warned, you will need to do woodworking if you want to mount the plate amp on the box!
12/27/2012 3:53:50 AM • JBL PB12... • Answered on Dec 27, 2012
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JBL SUB150 standby

Be the first to answer 12/22/2012 10:11:46 PM • JBL PB12... • Posted on Dec 22, 2012Be the first to answer
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Subs hum when i turn of my stereo

When it only hums when you turn On the stereo, check the cable and connections .When it hums, even without anything connected to it, then it needs repair
10/23/2012 10:11:57 AM • JBL PB12... • Answered on Oct 23, 2012
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Sub is blowing fuse

Isolate the power transformer from the circuit board, just to determineif it is from transformer or from circuits on the board.
10/23/2012 10:09:30 AM • JBL PB12... • Answered on Oct 23, 2012
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There is 80 volts DC in output i cannot find the problem.... i already replace the mospet ic.

Take the pair of MOSFET out, and try again.If output have gone down, then check the other componentsthat are connected to it.
10/23/2012 9:58:29 AM • JBL PB12... • Answered on Oct 23, 2012
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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.
10/22/2012 10:09:56 PM • JBL PB12... • Answered on Oct 22, 2012
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On/off switch is broken off. on jul PowerBass

If you are somewhat technical and can attach wires to the switch - we can list one in our store - contact us Edwards Electronics - Ebay - Thanks.
1/2/2012 8:27:38 PM • JBL PB12... • Answered on Jan 02, 2012
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Jbl pb12 popping green light on off

Perhaps it could be the capacitor as mentioned above - but it could be any number of other issues - if that don't fix it - send it to us - Edwards Electronics - Ebay - Check Auction - Thanks
1/2/2012 8:26:31 PM • JBL PB12... • Answered on Jan 02, 2012
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