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Gemsound XP 550 blown fuse

I bought this amplifier about 14 months ago, out of warranty, of course. It is a Gemsound XP-550 power amp. I used it for the forst time this past weekend and it worked great for about 2 1/2 hours, then blew a fuse.

The answer I received made sense, probably the outputs are blown and to return it under warranty. Unfortunately, I was using this as a back up amp and have had it for over a year when I first used it, so the warranty is no longer valid.

I was sent a schematic but of course, I have no knowledge of the internal workings. A friend looked at it and ran some specs on diodes on the output and said they read wrong. Is there something beyond replacing these diodes that I should figure? I live close about 40 miles southeast of Seattle, WA and wondered if there was a place here I could take it to and have it repaired? Or any suggestions would be helpful.

Thanks, Cecil McWilliams

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This is a standard amp design which should be a relatively simple repair. The output transistors are probably shorted. Check those first. Second, check the rectifier diodes in the power supply. Usually there are protection circuits that will prevent the fuse from blowing if the outputs are shorted.

Let me know your progress. I will attempt to get the service manual for this unit to get you more details.


Posted on Jun 29, 2009


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