Squawk and Talk MCR II Hum

cwstrong

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Joined
May 21, 2008
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Location
LONGWOOD, Florida
I've been trying to isolate a hum in my EDoT for awhile and notice that the Squawk and Talk board increases the noise significantly when plugged in.

I've recapped the entire machine including the original power chassis's two big caps, replaced ribbons on boards, verified everything is grounded to the power chassis and tested all fluorescent lights, ballasts and dual amps. The hum remains in all (4) speakers.

Does anyone know if a faulty chip on the Squawk and Talk could be to blame or even an additional component?

Thanks.
 
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