Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

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RE: Need MCS 3245 power supply repair help/advice

Posted by Cougar on July 9, 2008 at 07:42:33:
You need to desolder the caps (write down the orientation) and check them out of circuit to be sure which cap it is and which rail failed. Since this reciver is old and you already had a problem with it I would just replace all of the caps on that power supply PCB only after you have found out which cap has failed so you know what other areas to look if there are other problems. Get the values with increased voltage ratings because some of the designs have the voltage ratings too close to the operating voltage, this will give some safe operating values. Very good and cheap capacitors to use are the Panasonic FC and TS series caps, you will notice a big difference in sound quality once you do this.

Does you DMM have a diode checker? Please make sure you check the bridge rectifier to insure there is nothing wrong with it either, remember you should have a .6-.7 voltage drop across each diode.