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Tone Pot Issue

Posted: Fri Mar 16, 2012 11:20 am
by walrus
The neck tone pot on my '76 4001 doesn't do anything. It appears to be wide open, which is better that totally cut. For awhile it would work intermittently, not scratchy, it would either work or not. Is it possible that it's just a cold solder? If so, which wires should I look at? Or.. is it more likely that the pot is bad?

Re: Tone Pot Issue

Posted: Fri Mar 16, 2012 5:34 pm
by jps
Put a piece of wire from the cap lead that is attached to the lug on the pot to ground, this way you will bypass the pot and check that the cap is good and bleeding off the highs.

Re: Tone Pot Issue

Posted: Fri Mar 16, 2012 8:31 pm
by johnallg
If the cap is good, the pot will probably be open - the wiper is no longer touching the resistive element in the potentiometer. You can check the pot by putting an ohmmeter from the grounded outside lug (it is either bent and soldered to the body of the pot or a wire goes from the lug to the body of the pot) to the center lug and turning the pot and seeing if the resistance reading changes.

Re: Tone Pot Issue

Posted: Sat Mar 17, 2012 6:24 pm
by kennyhowes
I'm having a similar problem with my 4001 - the cap is working but bringing the volume down as well, not all the way to zero.

Re: Tone Pot Issue

Posted: Mon Mar 19, 2012 2:06 pm
by walrus
It Works! I checked the solder joints and all looked good but I heated them up and added a bit more. I love when a fix is that easy. Thanks all.

Re: Tone Pot Issue

Posted: Mon Mar 19, 2012 5:52 pm
by jps
Good to hear; so it sounds like it was just a cold solder joint. Try the same thing, Kenny. If that doesn't work, we will help get it sorted. 8)

Re: Tone Pot Issue

Posted: Wed Mar 21, 2012 8:27 pm
by kennyhowes
Mine: Someone had wired the open lug on the tone pot to ground. Doy.

I moved the ground wire back to the center lug and now it's fine.

Re: Tone Pot Issue

Posted: Wed Mar 21, 2012 9:07 pm
by jps
8) Easy fix, once you saw that!