What's wrong with my receiver?

[jskoreyk]

I have a yamaha htr-5890 that is giving me trouble. I don't really know much about this stuff so I'm hoping somebody would be able to give me a hand. So my receiver keeps turning off automatically once it hits a certain sound level. For example, if i watch a movie too loud, it'll shut off. But if i turn it down it's fine. Is it over heating or something or have i blown a fuse...or the amp? I know that one night i got plastered and was blaring my music pretty good and that's when it first cut out. Do i need to pick up a new receiver?

thanks for your help.

 

[markw]

As Chief Brody said in Jaws, "You're gonna need a bigger boat".

Offhand, it sounds like you're asking more volume from it than it can give and it's protective circuitry is shutting it off temporarily rather than going up in (figurative) smoke permanently.

 

[TLS Guy]

I have a yamaha htr-5890 that is giving me trouble. I don't really know much about this stuff so I'm hoping somebody would be able to give me a hand. So my receiver keeps turning off automatically once it hits a certain sound level. For example, if i watch a movie too loud, it'll shut off. But if i turn it down it's fine. Is it over heating or something or have i blown a fuse...or the amp? I know that one night i got plastered and was blaring my music pretty good and that's when it first cut out. Do i need to pick up a new receiver?

thanks for your help.

Check all your speaker wiring carefully. Make sure there are no whiskers at the receiver end or speaker, causing a short to the case or adjacent wires.

Now if it now cuts out at a lower volume than it did before you got plastered, you have done damage.

There are two possibilities.

1). You have damaged an output stage and it is now drawing more current than it should and setting off protection.

2). You have damaged one or more speakers. The overload may have started a partial voice coil melt down, and you have some shorted voice coil turns, lowering the impedance of a speaker or speakers.

You need to check the latter or you will damage your next receiver.

You need an ohm meter. You need to check the voice coil DC resistances of all your drivers. You will have to remove them to do this.

The compare the DC resistance of all identical drivers. Any that give a lower reading than the highest one are damaged and need replacement.

 

[jskoreyk]

hmm. Well i don't think it's my amp asking more than it can give. I used to be able to crank those things but now it's only doing half of what it used to be able to do. And i don't think i screwed up the voice coils because i know my speakers can handle the volume (Energy CR 70's). I think it's probably my amp that I messed up. i'll check out the ohm readings and see what the dilly-o is. Thanks for the help.

 

[TLS Guy]

hmm. Well i don't think it's my amp asking more than it can give. I used to be able to crank those things but now it's only doing half of what it used to be able to do. And i don't think i screwed up the voice coils because i know my speakers can handle the volume (Energy CR 70's). I think it's probably my amp that I messed up. i'll check out the ohm readings and see what the dilly-o is. Thanks for the help.

Check wiring first!

It could either be amp or speakers. They only have 6.5 inch woofers, you could easily fry the voice coils with those specs. Most domestic speakers actually handle very little power over time.

Just figure how hot a 100 watt light bulb gets. In the confines of a speaker VC gap, the voice coil heats up quickly.

It could be your receiver. Those speakers are 4 ohm. The manufacturer's 8 ohm nominal is as usual BS. However they do state the minimum impedance as four ohms. So a good rough guide to speaker impedance is minimal impedance plus 10%, which would make your speakers 4.4 ohm. That could easily fry a receiver at prolonged high volume.