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I have a JBL S120PII sub that stopped working. All I get is the red and green light flashing on top. Is this indicative of a specific issue?

Posted by Joseph Maluso on

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1 Answer

The Knight

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  • JBL Master
  • 76,416 Answers

Check and replace the power output MOSFETs [at the power amplifier circuit]. A damaged MOSFET can cause this continuous LED blinks. It is important to replace all the 4 MOSFETs at one time. Also, check for any further damaged to any other components too have occurred. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/

Posted on Oct 09, 2016

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TV 954

  • 3 Answers

SOURCE: jbl PB12 powered sub woofer problem

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.

Posted on Aug 09, 2007

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Anonymous

SOURCE: jbl PB12 powered sub woofer

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

Anonymous

  • 1 Answer

SOURCE: psw 3000 sub

I had the same problem. It is a loose conection on the print. The Amp unit goes into failsafe mode. You can check the Rc control. You are only alowed to turn it on and off. No signal regulating.
The solution is to remove the backside, and check the print for bad connections or even broken parts.
I experienced one leg on a transistor tha had broken.
Good look

Posted on Oct 12, 2008

budmrtn

Bud Martin

  • 11361 Answers

SOURCE: JBL PB10 subwoofer sounds distorted and lights on the front flash

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

Posted on Nov 10, 2009

budmrtn

Bud Martin

  • 11361 Answers

SOURCE: JBL PB12 is 10 years old and I have red lights but no audio.

Service manuals: http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB12%20sm.pdf

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.

Posted on Apr 01, 2010

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