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Question about JBL PB10 Subwoofer

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PB10 Loud Hum and Crackle- LED Lights mixed Red/Green

Hello, I have had the JBL PB10 for several years and have had no problems. I went away on vacation and came home to a loud humming and crackling noise coming from the sub even though my receiver and all other components were powered off. The sound continues when I disconect the input coming from the reciever and does not change upon adjusting any of the dials/switches on the built-in amplifier. I also noticed that the two LED lights on the front are a mixed red and green color. Does this sub possibly have a fuse that needs replacing or is there anything I can do to test for troubleshooting? Please help! Thank you in advance.

Posted by Jesse Canaday on

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Anonymous

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If you take all of the screws out of the panel where the inputs are you can get to the fuse. It is just above the power supply.

Posted on Jun 25, 2008

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Hello, Jesse. I doubt I can help, but there is at least one SIMPLE thing you can try - with maybe a 10% chance it wil return your unit to normal: Unplug the unit for 30 seconds, then plug it back in to a DIFFERENT outlet. Oh, yes - there are NO fuses or other "reset" devices. I'm sorry I couldn't offer you more help.

Posted on Jul 26, 2007

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An answer I given to another post.

While walking in my neighborhood, a JBL PB10 was thrown away for garbage pickup. I can use another subwoofer so I brought the orphan JBL PB10 home. It has the same problem. I am a retired electrical engineer. If I get the schematic, I might be able to fix it. I indeed found the service manual from the following URL. It turned out you can fix the problem by just cutting off one pin of a transistor. I don't think most people are interested in theory, but just a brief and then the solution.

JBL PB10 service manual
http://akdatabase.org/AKview/albums/userpics/10004/JBL%20PB10%20Service.pdf

The manual is for the version 6.3 circuit board. I have a version 7.3. But, they are the same for my purposes. The LED lights are controlled by an integration circuit shown on page 28. When the signal at the low level line input is smaller than 5mv rms, the LED lights are set to red. In the meanwhile, the integration circuit set the Q1 junction FET transistor to on so the SIG signal is grounded to subdue any nuisance of noises (no sound produced). When there is a significant signal at the line input, the integration circuit set the LED light to green and turns off the Q1 transistor so the SIG signal can be freely amplified by the AIM power amplifier.When the integration circuit malfunctions, most probably C42 fails (could also be C40 and/or C41). I don't have any capacitors at hand to fix so I just cut off one of the three pins in the Q1 transistor to disable it from grounding the SIG signal. Q1 location could be found on page 26. The pin to cut off is one of the two outer pins. It is the one further away from C40. Once you cut the pin off, the sound will be back. But the LED lights remain red.



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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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