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Old 29th July 2011, 02:12 AM   #1
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Default MTX RT2200X

Got this in for repair and when you hook a speaker up to it, It makes a loud high pitched hum out of the outputs almost like a 2k sine wave... Any ideas??
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Old 29th July 2011, 02:50 AM   #2
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Broken shield ground on the RCA jacks.
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Old 29th July 2011, 03:12 AM   #3
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brokrn shirld ground through some components?? The leg that goes to the shield on the rca's themselfs is in tack
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Old 29th July 2011, 03:40 AM   #4
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Does it do it with no RCAs plugged in?

Is the shield ground intact in the signal source?
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Old 29th July 2011, 03:48 AM   #5
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I checked the signal source and the shields are good..

Yes amp does it with no rca's plugged in
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Old 29th July 2011, 03:56 AM   #6
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You need to see where the signal starts in the preamp section. It could be due to a broken pot, especially in the crossover.
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Old 29th July 2011, 05:21 AM   #7
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Replaced all pots and the crossover switch amp still does the same thing..
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Old 29th July 2011, 05:35 AM   #8
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Did you try tracing the signal before you tried replacing the pots and switches?
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Old 29th July 2011, 05:43 AM   #9
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Trace the high pitch from the output terminals backwards to the preamp section ?? Since the amp does it with no rca's connected
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Old 29th July 2011, 06:47 AM   #10
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Trace it from either end.
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