Technics SA-410 stopped working today

Hi!

That's one of the Technics models that (IIRC) uses a "hybrid" power amplifer module. Most (if not all) of these modules were made by Sanyo.

(You can find an article about repairing a Telefunken amplifier that uses these modules here:

If you can find the module being sold anywhere and you know how to solder, you could replace it. There's not much you can do other than that. The insides of these modules aren't repairable as far as I know.

Be glad the unit didn't damage your speakers when it failed. I've seen a number of Technics receivers that burned out other internal components or the speakers that were hooked up to them. Your unit may turn off the speaker outputs via a relay if failure of the power amplifier module has taken place.

William

What you used to hear was the speaker protection relay coming in. If it gets as far as the green light coming on, that basically says that it has performed its checks, and it thinks that everything is ok. This makes it unlikely that there has been a failure of the output hybrid or associated components. It would also make it unlikely that that there is any such problems as shorted speaker wires or faulty speakers. That doesn't leave much, other than the relay circuit itself, which in reality means either a faulty driver transistor or, it being a Technics, bad joints on the relay coil pins. Another possibility is a problem with the speaker switching from the headphone socket.

My first moves would be to stick a pair of headphones in the front, and work the plug in and out a few times to see if that clears the problem. If it does, squib a little switch cleaner fluid in the socket and repeat. If no go, take the cover off, and locate the output relay. It will be not far from the output sockets. It's a small 'box' about 1" x 0.75" x 0.5" and is usually black, but may be blue. Place a finger on the top and push a little - down or to the side. If the relay clicks, look underneath for a bad joint. Beyond this, without faultfinding experience on this sort of kit, I don't think realistically, you are going to get far without landing the unit deeper in trouble. FWIW, the problem doesn't *sound* serious on the surface, based on experience of these things, and it would probably be worth spending out a little to get a professional opinion if you can't bottom it yourelf.

Arfa