gputto Posted February 25, 2009 Share Posted February 25, 2009 Hi,Im just clearing through a shelf of broken gear and have come across a SPX900 with a open primary winding on the mains transformer.I cant see a thermal fuse in it, and need to know the secondary voltages in order to find a suitable replacement.There seems to be 2 windings on the secondary, one centre tapped and one not. Does anyone have a SPX900 that they could meter the secondarys on? Yamaha have been extremely unhelpful in the aquisition of a replacement transformer.. have been waiting over 2 years for the part to become available now. CheersGeorge Puttock Link to comment Share on other sites More sharing options...
Rob_Beech Posted February 25, 2009 Share Posted February 25, 2009 Where abouts are you based. I know very little about electronics in the grand scheme of things, but I do have some 900's. So if you were close by you'd be more than welcome to come and measure whatever you needed to on one of mine. Link to comment Share on other sites More sharing options...
Mixermend Posted February 25, 2009 Share Posted February 25, 2009 You might have to fit 2 transformers - as you will need to produce +/- 15 volts for the audio stages and a 5 volt rail for the digital department, unless you are lucky enough to find a transformer with all the secondary windings. Check the voltage regulators to see if the above assumed voltages are correct. If so - you might look for a 15 - 0 - 15 VAC and 0 - 6 VAC windings, which should give plenty of margin for the voltage regulator IC's after rectification and smoothing. Link to comment Share on other sites More sharing options...
gputto Posted February 27, 2009 Author Share Posted February 27, 2009 Hey all,Good news, I found a suitable replacement.Windings are 15-0-15 and 0-6 VAC, you are correct Mixermend :) Thanks Rob_Beech for the offer anyway. RegardsGeorge Puttock Link to comment Share on other sites More sharing options...
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