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Old 24th July 2009, 09:31 AM   #1
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Join Date: Jun 2008
Default Gain not working

Ok, i had an amp which went mad when you fiddled the gain controller.
So i pulled it apart and there was some mad short across the pot in particlar positions. So i replaced the pot with an exact model, but now i get apsolutly no gain control at all, one volume irrespective of dial position.

I assume i have a blown logic gate somewhere, what can i do guys?
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Old 24th July 2009, 02:15 PM   #2
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Join Date: Nov 2003
Location: Louisiana
If the connection to ground (possibly through a resistor) is open, it could cause this. Clean the flux from the board and examine the solder connections, pads and traces with a lighted magnifying glass to see if there is a break anywhere.
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Old 29th July 2009, 03:06 PM   #3
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Fixed this, a pad had come away and made a split in the track. So i fixed that and it works. Cheers.
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