10-18-2014, 03:08 PM
It looks like the wipers have cut a track right through the resistance layer. This is pretty typical of pots which have seen a lot of use.
If cleaning does not help, you can carefully bend each wiper so that it sweeps out a slightly larger or smaller diameter, placing it on an unworn section of the resistance element.
If cleaning does not help, you can carefully bend each wiper so that it sweeps out a slightly larger or smaller diameter, placing it on an unworn section of the resistance element.