Gain not working

agithegreat · 24th July 2009, 08:31 AM

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?

Perry Babin · 24th July 2009, 01:15 PM

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.

agithegreat · 29th July 2009, 02:06 PM

Fixed this, a pad had come away and made a split in the track. So i fixed that and it works. Cheers.

24th July 2009, 08:31 AM	#1
agithegreat diyAudio Member Join Date: Jun 2008	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?

24th July 2009, 01:15 PM	#2
Perry Babin diyAudio Member 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. __________________ 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 2009, 02:06 PM	#3
agithegreat diyAudio Member Join Date: Jun 2008	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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