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GhEttOrAiD
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Marantz SR580 Main fuse keeps blowing..

Boss's friend found this awesome Marantz receiver in a dumpster... marantz is a pretty high end home audio maker so this thing was a gem. Worked great for years, then my boss and I were messing around with the wiring to his speakers around his upstairs living area and we heard a crack and saw a flash, I unplugged then opened the receiver, and there was a 125v 6a glass fuse on the main board that was blown. He replaced the fuse several times, every time you turn the receiver on, the fuse pops again. What's going on? None of the wires coming off of the rear of the receiver are even connected.

It's been unplugged for days so it's not overheating. What might have happened?
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Old 02-25-2009, 10:39 AM GhEttOrAiD is offline  
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jkoebel
 
Something is shorting, probably in the output stage of the amplifier and causing a huge current draw. Check all of the components on the board?
Old 02-25-2009, 10:55 AM jkoebel is offline  
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theacoustician
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Perhaps the fact it was in the dumpster should have been a sign?

Sounds like the power supply/regulator has gone south. I would really advise not to mess with it and just replace the unit in this case. You're talking about a lot of current and I'm assuming that the boss isn't someone to get in there and work at the circuit level if you're asking here.
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Old 02-25-2009, 11:01 AM theacoustician is offline  
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GhEttOrAiD
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Boss decided to take it to a professional... Probably a wise decision. I wasn't looking forward to electrocuting myself.
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Old 02-25-2009, 12:18 PM GhEttOrAiD is offline  
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anomaly95
 
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Quote:
Originally Posted by jkoebel View Post
Something is shorting, probably in the output stage of the amplifier and causing a huge current draw.

This. I've seen it many times where people carelessly connect/disconnect speakers while the amp/receiver is on. It almost always results in a fried output IC.
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Old 02-25-2009, 12:26 PM anomaly95 is offline  
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