Help. Is my Peavey Studio Chorus 210 FUBAR'd?

[bclemons]

I was using my Peavey Studio Chorus 210 to power a 2x12 cabinet (sounded really good BTW) and my 3 year old knocked the connections loose a day or so ago. When I went to play it today I noticed that it was on. I think the speaker wires may have gotten shorted together. All it does now with the speakers connected is howl loudly like mic feedback. If I disconnect one power amp from its speaker, I get no howl and no output. This happens with either power amp disconnected. What's probably wrong with it, and is it worth getting it fixed if I have to take it to a tech? Thanks

[Enzo]

Let me get this straight. Did you pull the wires off the internal speakers and use those wires to connect to other speakers? And now if you connect both speakers you get a howl, but disconnecting either one shuts it up?

I bet you mixed your speaker wires up. I'll bet my lunch money. My schematic doesn't cover wire colors, but typically one speaker gets yellow (+) and blue (-) wires while the other gets red (+) and black (-). I any case, the feedback circuit is from the speaker return. If you cross the wires, then the right amp will try to return through the left speaker, and vice versa. So each feedback will go to the wrong amp.

Try swapping the hot wire, the + wire, from each speaker.

Or look inside the chassis. there ar two heat sinks with a space between them. In that space is a ribbon cable to the headphones jack. The four speaker wires come from spots near that ribbon. two on the left for one speaker and two on the right for the other. The two posts closest to the ribbon cable are the + for each speaker. Note which color wires come from where, and make sure the left pair winds up on the left speaker and the right pair on the right speaker.

[bclemons]

Ok, you get to keep your lunch money. I accidentally did the hot wire switching inside the speaker cabinet, but now it's motorboating.

[Enzo]

I think I would still look inside and absolutely verify the wires are right.

If the outputs had been shorted and suffered damage, it is more likely the thing would blow fuses or at least put DC on the speakers.

Without looking in it, it is hard to say what it needs if the wiring is OK.

Just my gut feeling says in my shop you would likely face about $60-75 in labor and $20 or less in parts. Check your local shops for their rates.