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The unit is always Humming. I would like to get a schematic to trouble shoot

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It hums because it doesn't know the words (I crack me up).

Do you mean physical hum at the unit or audio hum through speakers?

BTW: no make or model number info came through with your post.

Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

Reverse the cables Left to Right to see if it stays with the cable or the input channel. Follow it back to the source, isolating in the same manner. Eventually you will find the entrance point of the hum. Freqquently a cable

Posted on Apr 05, 2011


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