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What have I done to my reciever?!?!?

Hello, I have speakers all over my house, wired to two seperate receivers . One speaker is wired to both receivers. This has not caused a problem for years. I usually remember to turn one receiver off before turning the other one on. But occasionally, I have forgotten to do this -- also no problem. Until last night, that is. I powered up my second receiver while the first one was still on and played some music through it and burned up something in the first receiver. It started making a hum in the speakers and clearly smelled of burning electronics. So I turned it off. When I got back to receiver one, it too was non-responsive on both sets of speakers. It was still powered on but nothing will come out of the speakers now. Not even through the headphones. I took the top off and tested the three fuses that I could see with a volt meter. All worked fine. So ... is there anything obvious I should check, or should I just buy a new one? I hope I provided enough info.

Reply to
Fred Mann
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P.S. - The receiver I care about is a Pioneer VSX 401 .

Reply to
Fred Mann

If the fuses are ok then you blew the outputs. Fixable if they're decent recievers, but probably not worth it if they're worth

Reply to
James Sweet

see

Thanks James! Just curious ... what would actually have been destroyed in this scenario? I believe every single speaker output was rendered non-functional - even outputs that weren't hooked up. Also, there was no burning smell on the "good" receiver.

Reply to
Fred Mann

Many amps have a protection circuit, if they detect a fault on one output, the rest will be disabled until the fault is corrected. There also may be a fuse further up the line somewhere, such as in the power supply area, but I wouldn't count on it.

Reply to
James Sweet

If you look at the answer again you'll see the word 'outputs'. This refers to the output devices in your receiver(s). Different ones use different types. Some have discrete transistor devices. If one of those, the output transistors and possibly other components associated with them are now defective.

Troubleshooting one of these is more difficult--but not as expensive to fix as the other type--that type being a unit with most of the amplifier circuitry encapsulated in an epoxy module.

Those modules are easier to troubleshoot because for the most part, the devices which will fail in such a scenario are all within that one module. Replacing the one unit will likely fix the problem. OTOH, the price for the part is higher than the various discrete parts in the first type. Replacement is more difficult in some cases because of soldering the number of closely-spaced pins involved. Many of the modules are discontinued and difficult to find.

jak

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Reply to
jakdedert

How silly. Next time put a couple of 4 or 8 ohm Rs onto your speaker, and connect one amp via one of them and the other via the other.

NT

Reply to
meow2222

I hate to sound wise after the event, but that was a disaster just waiting to happen.

you will need to troubleshoot the output stages of the amp. Good luck

- many amps drive even experienced techs to tears!

try eserviceinfo.com for schematics etc. And if you fix it, then make the next thing you do adding a switch box of some kind into this harebrained speaker circuit !

-B-

Reply to
b

A lot of units have a processor reset sequence you need to go through when it shuts down like that due to some over load.. Like holding in a couple buttons when you power it up and so on.. AS far as the other receiver generating smoke/smell, I'm sure that doesn't share the same kind of protection as I just detailed out.

--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
Reply to
Jamie

years.

on.

Thanks for all the replies. I think I'm going to throw in the towel on this receiver. Fred

Reply to
Fred Mann

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