57Gregy Posted February 1 Share Posted February 1 Just doing a little recording tonight, playing CbB through my keyboard and mixer then my amplifier and speakers when suddenly, it all crash in the speakah! Really, a super loud noise, then nothing. My Yamaha mixer now refuses to play anything, and the 2 channels I was playing the audio through having the 'Peak' red lights permanently on. The stereo receiver is apparently dead, too. This wasn't a computer thing. The project kept playing and CbB still works as expected. I monitored from the interface's HP output and all was fine there. I'm happy that I didn't have headphones on when it happened. It could have really damaged my ears (more than they already are). It is a paradox that I have bad ears, but loud noises still hurt. I know I have the Yamaha manual around here somewhere. I will seek it out and discover why the Peak lights stay illuminated. Link to comment Share on other sites More sharing options...
Mr No Name Posted February 1 Share Posted February 1 I've witnessed this before, maybe some sort of voltage issue. new psu needed ? blown capacitors? really need to open it up and get a multimeter on it and check capacitors ect. power surge (really big one) ? 1 Link to comment Share on other sites More sharing options...
pwalpwal Posted February 1 Share Posted February 1 have you power-cycled everything? 1 Link to comment Share on other sites More sharing options...
57Gregy Posted February 1 Author Share Posted February 1 3 hours ago, pwalpwal said: have you power-cycled everything? Except the receiver, whose standby light is still flashing. Link to comment Share on other sites More sharing options...
craigb Posted February 1 Share Posted February 1 It's obvious that you need to get a Soundblaster sound card. Simples! 😆 2 Link to comment Share on other sites More sharing options...
Mr No Name Posted February 1 Share Posted February 1 6 hours ago, Mr No Name said: I've witnessed this before, maybe some sort of voltage issue. new psu needed ? blown capacitors? really need to open it up and get a multimeter on it and check capacitors ect. power surge (really big one) ? Disclaimer : Always get a qualified technician to work on electrical equipment due to risk of electric shock. Link to comment Share on other sites More sharing options...
Amberwolf Posted February 1 Share Posted February 1 1 hour ago, 57Gregy said: Except the receiver, whose standby light is still flashing. Hopefully nothing actually got damaged. If your mixer is like mine (MG16?) , it has a dual-voltage-rail wall adapter, and if the negative rail goes down or is wrong, it could cause audio path problems while not keeping the whole thing from appearing to "work". 29 minutes ago, craigb said: It's obvious that you need to get a Soundblaster sound card. Simples! 😆 Like this one? https://hackaday.com/2019/06/19/reverse-engineering-the-sound-blaster/ Link to comment Share on other sites More sharing options...
57Gregy Posted February 2 Author Share Posted February 2 The computer is okay. The receiver is good. The interface works. The keyboard is fine. The mixer is fried. 😑 It's a Yamaha MG8/2fx I have had for a long time. I found the manual, but there is no troubleshooting section, and I can't find anything about why the Peak lights stay on for 2 channels (the channels my Focusrite interface was plugged into), just that they illuminate when the signal reaches -3dB below clipping. I tried all the channels and not a one allowed sound through. Fortunately, I just happen to have an old-but-never-used Yamaha MG06 lying around. It's smaller, and has no onboard effects, but it will do for now. Link to comment Share on other sites More sharing options...
Amberwolf Posted February 2 Share Posted February 2 You might be in luck; I found this in a quick google: https://elektrotanya.com/yamaha_mg8-2fx.pdf/download.html#dl it is actually the service manual, schematics and all, though it has no troubleshooting tips that help. too big to attach to the post though. Power supply appears to be a split rail type like mine, so if you have a voltmeter, try measuring it to see if it's output is the same on both "sides" of the center rail. It's just transformer in the box, no dc stuff, so you'd set your meter on 20VAC and connect the black lead to the center pin, then measure to each of the side pins. they should both measure the same, around 18.5vac. If they're not, you can probably fix it with a new adapter (PA-10). *** If they both measure the same, and correct, then hte problem is inside the mixer itself. *** (my mixer came from goodwill without an adapter, and a new one would've cost more than the mixer did, and a really cheap aliexpress-type "direct replacement" was not what it claimed :lol: and was so small that it ran so hot I thought it would catch fire...so I am actually using a split-rail *DC* supply from a Bose speaker system that I also got at goodwill for very cheap...but I don't recommend this type of workaround unless like me you are a hack that's willing to deal with possibly blowing up the mixer ) 2 Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now