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Hello, I was working at a outdoor festival recently, nice dry weather, approx. 75 degrees outside. We were running three stages and my fellow sound tech was using one of my GL2400-32 channel AH mixers. He started the show and then noticed the mixer was shutting down, He could see the power supply lights going dim, cutting off then back on. It was running on the internal pwr supply only. A burn smell was coming from the mixer. He told me the power supply was going bad. I do not know what connections he had made to the mixer. Unfortunately I could not get any more info from him because we have parted ways. I have not seen him since. I purchased this mixer as a new store demo and this was the first time I had used it. I connected it in my shop and run it for 24 hours with no issues. It still has the burn smell and it seemd to be coming from somewhere near channels one through 16.I have the back removed and need a way to thoroughly test each channel.I have a replacement power supply and also an external power supply but the burn smell seems to be coming from somewhere else.Could something have been connected to a channel to cause this kind of damage? Could a short in a input with the phantom power on cause any damage? Thanks Steve

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Cachepe.samedaymusic.com/.../gl2400ug_ap5597_2-42fad5e2de1bc79db38576be174464d4.pdf - United States
Above is your user manual below is a service and repair manual.
http://www.performanceaudio.com/cgi/product_view.cgi?products_id=16696

Indeed i would suspect something around your Final Output semiconductors, and any associated resistors?
You really must obtain a service manual, here there are the troubleshooting steps required to isolate and hopefully allow repair of your unit.
Look for any discolored components etc, check if any are overly hot... use a temperature probe on suspected components. Freeze spray may also be useful in diagnosis.
Use your eyes & nose to isolate the bad burnt overheated components, I sometimes use a straw up a nostril and selectively go over suspect parts, and "Sniff" to try and detect the overheated smell... it works.
http://www.allen-heath.co.uk/uk/TechnicalSupport.asp
Above is your tech support link, contact them for any info you require.

Posted on Nov 30, 2010

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