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amp signal on constantly


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t&t tech 
Platinum - Posts: 2,608
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Joined: October 05, 2008
Location: Trinidad and Tobago
Posted: May 13, 2011 at 5:54 AM / IP Logged  
What causes this? I have verified that the amp is sending a signal to the sub constantly. I know the amp is faulty but what exactly is the defect? I can't remember the brand off hand, but if i could get a general insight as to what might be the problem i would appreciate it. Thanks.
commit your way to jehovah and he will act in your behalf. psalms 37:5
i am an idiot 
Platinum - Posts: 13,670
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Joined: September 21, 2006
Location: Louisiana, United States
Posted: May 13, 2011 at 2:47 PM / IP Logged  

Do you have a Pioneer deck?

t&t tech 
Platinum - Posts: 2,608
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Posted: May 15, 2011 at 12:38 PM / IP Logged  
Nope, JVC.
commit your way to jehovah and he will act in your behalf. psalms 37:5
KyferEz 
Member - Posts: 38
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Joined: March 23, 2002
Location: United States
Posted: May 15, 2011 at 6:47 PM / IP Logged  
Sound to the sub without an input? It's caused by an oscillation in some section of the amp. It can happen anywhere from the input filters to the voltage gain section to the final output stage.
Gotta search for the oscillation with a oscilloscope, tracing the audio path and testing each section until you find where it originates from.
Try adjusting the gain pot and the filter pot if you have it to see if the oscillation goes away at any setting...
t&t tech 
Platinum - Posts: 2,608
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Posted: May 16, 2011 at 5:26 PM / IP Logged  
Ok, thanks man, i see you've joined since 2002, nice to see you around again,
commit your way to jehovah and he will act in your behalf. psalms 37:5
i am an idiot 
Platinum - Posts: 13,670
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Joined: September 21, 2006
Location: Louisiana, United States
Posted: May 17, 2011 at 6:58 PM / IP Logged  
Is it a Kicker amp?
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Platinum - Posts: 2,608
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Posted: May 20, 2011 at 6:25 AM / IP Logged  
Yup.
commit your way to jehovah and he will act in your behalf. psalms 37:5
i am an idiot 
Platinum - Posts: 13,670
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: May 20, 2011 at 1:34 PM / IP Logged  

Kicker uses the same type of surface mount fuse the same way Pioneer uses them.  Which amp is it?  Is it a 2 channel amp? 

t&t tech 
Platinum - Posts: 2,608
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Location: Trinidad and Tobago
Posted: May 20, 2011 at 6:56 PM / IP Logged  
No, monoblock, but i don't really wanna repair it, i just wanted an idea as to what the problem could be so that whenever i encounter it again and the customer asks what's the problem i can muster up something more than the amp is defectiveamp signal on constantly -- posted image., so what's your general theory mr IAAI?
commit your way to jehovah and he will act in your behalf. psalms 37:5
i am an idiot 
Platinum - Posts: 13,670
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: May 20, 2011 at 8:09 PM / IP Logged  
Have you ever heard the noise caused by the blown fuse in the Pioneer decks?  Same type of fuse in the shield of the RCA cable connection.  If you see it again, let me know the model number of the amp and I can tell you where the fuse is located on that particular amp.

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