Question about JBL Audio Players & Recorders
Posted by Anonymous on
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Posted on Jan 02, 2017
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
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
SOURCE: jbl sub 135 motorboating b4
Turning the unit on without any input signal, the speaker did the pop and scratching sound. I found on the limiter board ( small pc board on the main input pc board) that there is a wire jumper on the back side of that had a cold solder joint. You will have to clean up the glue that was used to hold the wire on the back side of the board. I just replaced the wire with new one.
Look at the +15vdc off of Q117, I moved it to the left side of the pc board and added a heat sink to the unit. The 1 watt resistor created some cold solder joints that you will have to check.
hope this helps
Posted on Jul 18, 2009
SOURCE: Jbl sub woofer
Has nothing to do with the signal or source - it is a failure of the turn on circuit - I repair this amp - can help if you find my add here or I am located on ebay as well. Juust do a search for We Repair JBL and find the model :)
Posted on Oct 23, 2011
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