Rotel RX950 with humming noise

jorgens · 27th March 2007, 10:02 AM

Hello!

My dear old receiver just recently started to make a humming "background noise" (actually quite loud) it seems to me it must be something wrong in the power supply as the humming noise is 50Hz. Could it be the smoothing capacitors? If so - how do I localize them?

XEAGLEKEEPER · 28th March 2007, 08:34 PM

jorgens
Unplug the unit from the mains power source.Remove the cover . Look for 2 0r 4 large plastic coated aluminum cans,these would be the main power supply filter capacitors!Look them over real good usually when these go south they get hot and swell up or bulge out and start to leak a oily (electrolyte) substance.

Beware those same capacitors may still have a healthy charge on them..If you touch the terminals and chassis ground you may get a education!

Dave

27th March 2007, 10:02 AM	#1
jorgens diyAudio Member Join Date: Mar 2007	Rotel RX950 with humming noise Hello! My dear old receiver just recently started to make a humming "background noise" (actually quite loud) it seems to me it must be something wrong in the power supply as the humming noise is 50Hz. Could it be the smoothing capacitors? If so - how do I localize them?

28th March 2007, 08:34 PM	#2
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	jorgens Unplug the unit from the mains power source.Remove the cover . Look for 2 0r 4 large plastic coated aluminum cans,these would be the main power supply filter capacitors!Look them over real good usually when these go south they get hot and swell up or bulge out and start to leak a oily (electrolyte) substance. Beware those same capacitors may still have a healthy charge on them..If you touch the terminals and chassis ground you may get a education! Dave __________________ Ret. USAF... AKA- Avionic * Solder slinger for hire...*

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