J Pearce Posted January 13, 2012 Share Posted January 13, 2012 I'd guess that its not your voltage rails shifting but something causing your ground rail to move by 9V. Perhaps a dying decoupling capacitor? Link to comment Share on other sites More sharing options...
boatman Posted January 13, 2012 Author Share Posted January 13, 2012 Thanks Jon. I've just been sent a link to all the schematics for the WZ16:2DX series which include the power supply, so I'm on a roll. For anyone who might need them they are publicly available here: http://www.allen-heath.com/UK/Products/pages/ProductDetails.aspx?catId=&ProductId=WZ162DX&SubCatId= Link to comment Share on other sites More sharing options...
boatman Posted January 23, 2012 Author Share Posted January 23, 2012 I tracked the voltage fault down to a poor solder joint on the connector/PSU PCB inside the back panel. The channel fault was a bit harder to find but turned out to be an open-circuit resistor in one emitter leg of the input amp. After changing transistors and op-amps I still couldn't make sense of the biassing so in desperation started to measure all the resistors. The fourth one I tried was open-circuit, but showed no signs of having had its smoke let out, so I'm non the wiser as to the cause of the problem. Anyway it's fixed, the multi-core is made and it all worked perfectly over the weekend. Oh, and whilst I'm here, Happy (Chinese) New Year and welcome to the year of the Dragon. Link to comment Share on other sites More sharing options...
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