JBL PSW 1000

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Like the title says, I happened upon a used one for $20. Of course, I got what I paid for. No worky. The system appears "on", by the lit led. There is an audible thump when RCAs are connected and disconnected when the unit is "on". I must assume that the amp is shot, as the speaker itself seems to work. Any schematics out there or ways to diagnose this?
Thanks, Eric.
 
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