JBL E250P subwoofer repair

[mjrpainless]

Hey all,

I have a subwoofer that I'm trying to troubleshoot.The driver was blown. I measured some AC noise on the output with the unit powered on, and no input connected.

I'm usually pretty good at these things, but this thing has been a pain. Any help, or pointers would be greatly appreciated.

I am beating my head against the wall. And am looking for some guidance. I have posted the service manual. 

[don.r]

Test output transistors for shorts. I'm working on a bench dmm that has a shorted op amp (44K Vdd to Vss) and that was causing a big AC ripple on the power rails.