Question about Bose Lifestyle SA-3 2-Channel Amplifier

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Bose SA-3 Amp / Blown Fuse

I inadvertently crossed the speaker wires on one channel and from then on, the amp would not power-up. I located a blown fuse and replaced it but the amp still will not power-up (as indicated by the LED). I can trace the power up to the transformer and it's correct at 120v. How can I trouble shoot thru the transformer? What should I expect on the "other" side?

The transformer is "Billion 271728 REV;.01

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The problem is not the transformer. You now have shorted output transistors at the very least. By corssing the wires you presented a zero(0) ohm impedence load to the output section. It quickly went into overload. Before the fuses had a chance to open up, the outputs fried. This unit will require new output transistors and perhaps the previous driver circuit will require parts as well. Figure on $20-$50 in parts plus hte local labor rate for the repair.

Dan

Posted on Oct 01, 2008

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