Question about Pyramid XPA200 Amplifier

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Humming noise thers a humming noise in the out put channels after it plays for awhile how can i fix this?

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Make shure your wall socket is grounded.Pull cover and look for black and wite and green wires on the back of the plug.Also may have leaking capacitors in final output stage may need a repair man look at the directory on this site.

Posted on Dec 01, 2007

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Posted on Jan 02, 2017

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1 Answer

Td 307 hum


Generally hum is associated with Capacitors, though in this case it might a semiconductor (transistor or IC) that is getting hot and when it does causes the noise. If this is the case you can feel around with your finger to see if any of these is getting very hot to touch. If the noise is in both channels then you could looking at something that is common to both channels. Not much help though if it's an IC as they tend to work both channels these days. One way of finding out is to use Servisol Freezer spray on a suspect part. You wait while the noise appears then blast the parts (one at a time) with the spray. If the noise goes away on one part, but not on others, you will have found your part that is faulty.

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Hello
Switch on your amp, keep its volue down to extreme low, and listen if there is still hum through the left channel or not. If still there is hum, the left side power amplifier section inside the amp;ifier is faulty. If htere is no hum at this state, hum enters thorugh the audio input terminal, and the input wires must be checked for open sheild connection. OK.

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The hum therefore is a generated before it reaches the volume control. Check that all the connects are good, a bad earth will cause a hum. If the hum is in both channels it will be something that is common to both. Electrolytic Capacitors are there to take out hum, so suspect them first!

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1 Answer

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the humming noise could be from two sources and it is worth while doing a few simple checks first the drain pump is jammed with a foreign object. check nothing caught in the impellor second water not available - check taps turned on. also turn water off, undo fill hoses, put in a bucket and turn water back on try on drain or spin programs to check water drainage as well

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