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HT subwoofer vol stuck on high

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sisk...@gmail.com

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Nov 25, 2017, 11:58:41 AM11/25/17
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Hi all

I have a home theater subwoofer that the volume is stuck on high and I can't adjust with the knob low or high it's just stuck on high. I have checked the solder around the volume control and resoldered them all and cleaned the control with a contact/lube spray and still nothing. What is wrong with it??? What can I do to check for the problem? Any advice will be welcomed!!!

Serge

tabb...@gmail.com

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Nov 25, 2017, 7:18:51 PM11/25/17
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Sounds like the ground end of the pot has come disconnected. Most likely where it's soldered, or perhaps inside the pot.



NT

Jon Elson

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Nov 27, 2017, 4:11:28 PM11/27/17
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Yes, very frequent problem, especially if the pot is not bolted to the case,
is that the resistance element has cracked. If that is the case, most
likely the pot will have to be replaced.

Jon

tabb...@gmail.com

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Nov 27, 2017, 4:45:59 PM11/27/17
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On Monday, 27 November 2017 21:11:28 UTC, Jon Elson wrote:
A basic multimeter should determine whether the pot is bad or disconnected.


NT

tabb...@gmail.com

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Dec 2, 2017, 4:52:41 PM12/2/17
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On Saturday, 25 November 2017 16:58:41 UTC, sisk...@gmail.com wrote:
If you didn't manage to fix it so far, adding a resistor from pot centre tap to ground should sort it. Value = apx half the resistance of the pot.


NT
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