MTX RT2200X

mike49504 · 29th July 2011, 02:12 AM

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??

Perry Babin · 29th July 2011, 02:50 AM

Broken shield ground on the RCA jacks.

mike49504 · 29th July 2011, 03:12 AM

brokrn shirld ground through some components?? The leg that goes to the shield on the rca's themselfs is in tack

Perry Babin · 29th July 2011, 03:40 AM

Does it do it with no RCAs plugged in?

Is the shield ground intact in the signal source?

mike49504 · 29th July 2011, 03:48 AM

I checked the signal source and the shields are good..

Yes amp does it with no rca's plugged in

Perry Babin · 29th July 2011, 03:56 AM

You need to see where the signal starts in the preamp section. It could be due to a broken pot, especially in the crossover.

mike49504 · 29th July 2011, 05:21 AM

Replaced all pots and the crossover switch amp still does the same thing..

Perry Babin · 29th July 2011, 05:35 AM

Did you try tracing the signal before you tried replacing the pots and switches?

mike49504 · 29th July 2011, 05:43 AM

Trace the high pitch from the output terminals backwards to the preamp section ?? Since the amp does it with no rca's connected

Perry Babin · 29th July 2011, 06:47 AM

Trace it from either end.

29th July 2011, 02:12 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	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??

29th July 2011, 02:50 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Broken shield ground on the RCA jacks. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th July 2011, 03:40 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does it do it with no RCAs plugged in? Is the shield ground intact in the signal source? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th July 2011, 03:56 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You need to see where the signal starts in the preamp section. It could be due to a broken pot, especially in the crossover. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th July 2011, 05:35 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did you try tracing the signal before you tried replacing the pots and switches? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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29th July 2011, 03:12 AM	#3
mike49504 diyAudio Member Join Date: Sep 2006	brokrn shirld ground through some components?? The leg that goes to the shield on the rca's themselfs is in tack

29th July 2011, 03:48 AM	#5
mike49504 diyAudio Member Join Date: Sep 2006	I checked the signal source and the shields are good.. Yes amp does it with no rca's plugged in

29th July 2011, 05:21 AM	#7
mike49504 diyAudio Member Join Date: Sep 2006	Replaced all pots and the crossover switch amp still does the same thing..

29th July 2011, 05:43 AM	#9
mike49504 diyAudio Member Join Date: Sep 2006	Trace the high pitch from the output terminals backwards to the preamp section ?? Since the amp does it with no rca's connected

29th July 2011, 06:47 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Trace it from either end. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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