9900 / 6666 volume control problem.

[ghost123uk]

My "Anytone" (silly name) 6666 has developed a strange issue with it's volume.

Occasionally, with no input from me, the volume "jumps" from say number 07 to number 12, or down to 03, etc, fairly random as far as I can see.
It's not just the number, it is the actual output volume as well.

Note, the volume pot, whilst it is a normal pot (I think) does not work the same as they usually do, it actually controls a digital circuit

Normally I would suspect a worn volume pot, but I don't think this is the case here because it does the same if I turn it up to nearly full, away from the "normal use" range, where wear might be expected.

The other problem is that the access to the pot is a HORRID job with lots (maybe 30) of tiny solder connections that have to be removed that join the front panel to the main PCB, so I cannot even try a squirt of Deoxit or Servisol (not that I think that would work in this case).

I have checked for dry joints by examination and tapping / moving "stuff" whilst it is on.

Note, I am very well experienced with more conventional setup repairs as I am a retired electronics engineer, but not up to speed with the latest gear.

Any thoughts on this folk ?

[Edd200sx]

Personally I’d order a new control from knights and get it fitted

Pretty easy rigs to work on imo

[ghost123uk]

Thanks for the input Edd.

So I see you consider it may be a failing pot, even though it does this "jumping around" even when set well away from it's normal operating position ? If you reply "yes" then I will do as you say and try to source a pot from Knights (etc).

Re working on it (the front panel). The problem is there is one screw that needs to be removed that is totally inaccessible unless you de-solder the 30 or so "right angle" solder connections between the front panel and the main board. They are VERY close together !!

[Edd200sx]

Thanks for the input Edd.

So I see you consider it may be a failing pot, even though it does this "jumping around" even when set well away from it's normal operating position ? If you reply "yes" then I will do as you say and try to source a pot from Knights (etc).

Re working on it (the front panel). The problem is there is one screw that needs to be removed that is totally inaccessible unless you de-solder the 30 or so "right angle" solder connections between the front panel and the main board. They are VERY close together !!

I can only say every volume issue I’ve had on those has been
A bad pot. No guarantee obviously

Solder braid the connections off
They re flow back really easy