SOLVED Tone Pot Acting Like Volume Pot

[joelorigo]

I finished this Candid Drive and tested it on the Auditorium Test Platform and then in the enclosure. Everything seemed fine. I then took it apart, applied a waterslide decal and clear coat to the enclosure, and put it back together. Now the TONE pot is acting like a volume and I am almost certain it was previously acting like a proper tone pot before. Everything else seems normal.

Anything look like the obvious cause of that?

 

[Nostradoomus]

Looks like you soldered your power wires in after it was in the box, give em a scrub with a toothbrush and iso especially around the - pad and lug 1 of the tone control. Lug 1 isn’t connected in the schematic but if it is making a ground connection that would explain it.

 

[owlexifry]

Now the TONE pot is acting like a volume and I am almost certain it was previously acting like a proper tone pot before. Everything else seems normal.

Anything look like the obvious cause of that?

no idea, but make sure pin 1 of the tone pot isn't touching anything (especially ground) - check continuity etc.

 

[music6000]

As discussed above:
With power disconnected, Check for Continuity!
1. Does Red Circle have Continuity with Green Circle?
2. Does Red Circle have Continuity with Light Blue Circle?

 

[joelorigo]

Looks like you soldered your power wires in after it was in the box, give em a scrub with a toothbrush and iso especially around the - pad and lug 1 of the tone control. Lug 1 isn’t connected in the schematic but if it is making a ground connection that would explain it.

All soldering was done before removal to work on enclosure graphics.

 

[joelorigo]

As discussed above:
With power disconnected, Check for Continuity!
1. Does Red Circle have Continuity with Green Circle?
2. Does Red Circle have Continuity with Light Blue Circle?
View attachment 76943

Continuity with red and green. Not with red and blue.

 

[joelorigo]

It was a little bit of a too long lead on the "-" wire touching lug 1 of the Tone pot on the underside the PCB. Must have got bent toward the pot on re-assembly. Good reminder to clip wire ends after soldering. I see a couple others that need it on this build.

Thanks guys!

 

[Feral Feline]

Looks like the power lead is almost long enough to make contact with #3 pad of the tone control (to the left of Music6000's blue circle).

You COULD make a connection between blue and red (lugs 1&2), the circuit will still behave as it should and even if ever the pot craps out, in most cases the signal would still get through.

 

[music6000]

This is the only way for stranded wire for me, I twist all the strands & solder the wire before putting it into the pad hole like this:

 

[owlexifry]

This is the only way for stranded wire for me, I twist all the strands & solder the wire before putting it into the pad hole like this:

View attachment 76975

absolutely.

or just use solid core

 

[joelorigo]

I like things about solid and stranded wire. But early on I went with a box of assorted color solid and I still have some left.