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VSX-D466S MY AMP KEEPS BLOWING THE MAIN INTERNAL FUSE ,NO SPEAKERS ARE CONNECTED WHEN THIS HPPENS.HELP.

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Bad News!
If the fuse is in the mains (power line) you could have a bad rectifier or other problem in the power supply. Most amplifiers nowadays have switching power supplies and they are not as easy to troubleshoot as the older linear supplies. If an Output or driver transistor is shorted, the power supply fuse will dump just as fast, load or no load.
Mister Phil

Posted on Apr 09, 2008

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The converter should not b e a problem. It's time to ask a technician or a HiFi shop, an internal short circuit is blowing the fuse. Don't insist.

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Well you are on the right course. I suspect you think the problem is in the power supply and it's probably not. I think that what's gone is either a transistor (or more) or an IC amp - if it uses one - on the main power amp stage. Look at the devices on the heat sink. I think that's where you will find your shorted device.

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• Heat could be one of the cause.

As it heats up it consumes more power.


• Another factor is the load ( speakers )

if it is set for 8 ohms and you have 4 ohms in load.


• There could be other factors like the main amp itself

one should check it thoroughly.

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When the fuses blow like that suspect an overload in either the power supply or main amp stages. I think you might have damaged one or more of the output devices. They can develop faults quick if you're using the wrong type speakers or have faulty wiring to them. The main cause of fuse blowing is a semi-conductor device that is acting like it is a piece of wire. For instance an output transistor when connected to a multi-meter on the ohm scale, will show a full scale deflection, just like if you had touch the two test probes together.

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1 Answer

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2 Answers

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1 Answer

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Look carefully for burnt or damaged parts. If there's more than one fuse, follow the path of the one that is blowing it might lead you to the suspect.

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1 Answer

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