Question about Denon PMA-100M Amplifier

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My Denon amp (model PMA-900V) has suddenly devloped a hum/buzz. Regardless of the setting/mode, there is a hum coming from the speakers. I am assuming it's the capacitors. Any other ideas? Do you know how many capacitors are in this unit? Is it easy to replace them? The repair shop I used for years (Audio Clinic in Silver Spring, Maryland) closed and I haven't found a decent repair shop yet so I am thinking of attempting the repair myself. Thanks in advance for your help. Mike Moore

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It won't hurt to replace the Capacitors. The ones in question will be the big ones in the power supply. They will be at least 2,000UF and more likely higher. Replacing should be simple. All you need do is unsolder them and fit new ones. Sometimes they glue them in, so if you have got rid of the solder and they wont budge, that's why! Replace them with what it says on them if you can. But you can go higher. For example if it says 2,200UF 50v you can replace it with anything above that, but nothing lower. The only other problem with none direct replacement is size. So make certain it will fit in the space. Oh make certain too you get the + (on Cap) to the + on the board (though most are marked with the - symbol, so put the - to the -). Also look out for the temperture rating of them, marked (say) 85C. Again you can fit one higher, but fitting one lower will cause it to fail quicker though it will work.
If they don't solve the problem you could be looking at something on the main amp board causing it. Remember because the hum is in both channels it has to be something common to both.

Posted on Oct 14, 2010


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