Question about Denon AVR-600 Receiver

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Every time I put a fuse in my amp and plug it in the fuse blows ?????

When I plug my denon receiver into the plug end the fuse will blow.Put another fuse in and plug it into the wall and the fuse blows again.And it keeps on blowen fuses every time I change it.And it doesent take a while to blow it blows as soon as I plug it into the wall.My amp is a denon AVR-600 receiver. What can I do to fix this problem??????

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  • mattallinger Feb 25, 2009

    The fuse on the main power transformer will blow every time it gets power. On my amp it appears to be a short in the 125V windings??? as I can cut the L/V wires that go to the main board (ruling out any problem on the Circuit board) and the transformer will still blow a fuse with no load on it.

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I can help you solve this problem. However you must describe to me which fuse you have replaced. Is it the fuse on the power line or is it a fuse in the speaker line (which I highly doubt). usually this type of amplifier uses two technologies. One is transistors the second is integrated chips. This is in regard to the output stages. I assumed you speaker cables shorted each other while the volume was set at a high level with music playing. Anyway if you are willing I am able to help.

Posted on Sep 01, 2007

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Foxyjay
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If your amp looks like it's going to work as normal (ie the front display lights up as it should etc), but then the amp goes into protection mode when the anti-thud circuit times out, then I know what's likely to be wrong.

It's one of the power amplifier channels which has gone faulty.

I just found this out after having this problem with my AVR-1906.

I took the amp apart and de-soldered the suspected channel power transistors (centre channel in my case).....and hey-presto! it fired up as normal (obviously the centre channel would be out of service).

I have ordered the replacement transistors from Farnell (UK) at a miserly cost of around £2-£3 each.

Just waiting for them to arrive.

An alternative is, if you don't use all your channels, take the transistors from a known working but not needed channel and swap them over with the duff ones.

Hope thats of use!

Posted on Aug 16, 2008

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Unplug the receiver first, then take off the top and follow the A/C cord into the unit. It should go right to the fuse, or it will go to the transformer and then the fuse. It should be a glass fuse for this unit, about an inch or so long and in a cylinder shape with metal tabs on each end. You can usually tell if it is good just by looking at it. If the glass area looks a little black it is bad, if it is clear you need to look very close and see if the filament inside is intact and not broken or separated at any point. A clear fuse can still be bad, that's why you need to look close. If the filament is in good shape, it is probable good.

If you replace the fuse and then plug it back in and turn it on, and then it blows the fuse again, please do not keep trying to turn it on or put in a higher rated fuse. It will only damage the unit further. You will need to have it checked by a service technician, it probably has a blown channel and replacing the fuse over and over again will only damage more parts.

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If you don't have an ohm meter you can simply disconnect one speaker at a time and run that way until the fuse blows. If the fuse never blows then you've found the suspect speaker.
Sometimes blown speaker can hide by stealth. When cold everything is normal. When things start to heat up from use the failed circuit shorts and blows the fuse on your amp.

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When a receiver does this, it is know as the "protect mode". This keeps the receiver from causing more damage to the components in it, by shutting it off when it detects an abnormal amount of voltage or current.

If you had to replace the fuses, it is most likely that you have a blown channel in the receiver.

You put 8 amp fuses in, so I hope that the fuses that blew were 8 amps as well. If you put fuses in that are higher rated in amps than the ones that blew, you will most likely cause more damage to the unit than need be. If the fuses keep blowing, please stop putting new fuses in again until the unit is repaired. Every time a fuse blows, it is because of too much current is going thru the unit. Having too much current is a very bad thing for electronics, it causes components to short out and sometimes even catch fire if the fuse is higher rated than it is supposed to be.

To find out just what parts will need to be replaced, you need a multimeter and then you will need soldering tools to remove the bad parts and put the new ones in.

When an amplifier channel gets blown, there are normally around 5 to 10 parts that will need to be replaced. If you do not replace every single bad part in the channel that has blown, you will most times blow up all the new parts that you just put in.

If you have no experience with electronics, you really should take it in to a service center for repair. If you are willing to try it yourself, let me know and I will guide you thru the troubleshooting steps to help you identify all the faulty components.

Onkyo is very well made equipment and is worth getting fixed.

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