Fixing “Popping” Noise when Knob/Pot is Rotated

 

The pots must be well grounded in the control cavity. When they are loose or not making good contact with ground, the symptom is often a “pop” when the pot is rotated through its range. It can sound a lot like a loose plug/jack.

Carefully remove the knobs from your instrument  (see photos), then make sure the pots are tight.  Remove the control cavity cover and hold each pot in position with one hand while you tighten the nut with the other hand.  Do not over-tighten…just make sure that the pots are firmly seated and that they do not move or rotate with you reach the extremes of rotation.

I have attached a few pictures showing a safe way to remove the knobs if they are tight.  Excessive force, especially on the Volume and Mid pull-pots can pull out the shafts.  Try to take the knobs off gently by hand first before trying to pry them off as I show in the photos.  I used a screwdriver in the pictures, but a small thin putty knife also works well.  Just work around the knobs prying up a little bit at a time in each location.  Be very careful that you don’t gouge the finish with the screwdriver.  Once you have the knob loosened you can usually pull it off with your fingers.


You may not need to remove the pull pot knobs (volume, mid) if your tightening tool will fit underneath them.  Usually it is pretty obvious when a pot is loose, so just focus on those first.