[sdiy] scanned pots "jumping"

[Dave Kendall]

Hi all.


Following on from the pots/vs. encoders thing, when playing a Nord 
Electro (with scanned pots, not in parallax mode) occasionally a 
parameter setting will jump, presuambly from the vibration of the 
instrument being played hard. I've got used to leaving the knobs in a 
"safe' position before a gig in case something drastic happens, which 
on occasion it has..

Is this a common fault with such systems? FWIW, the machine did this 
more often when it was brand new...

cheers,
Dave

On Feb 3, 2010, at 00:35, Dave Manley wrote:

> When an encoder becomes unreliable is it because
>
> 1. the switches are worn out
> 2. the switches are contaminated and need cleaning
> 3. the mechanical cam that operates the switches is worn out
> 4. debris from wear on the cam/switches is blocking the switch 
> operation
> 5. ???
> 6. any and/or all of the above?
>
> Anybody take one of these apart and do an analysis?  Does spraying 
> cleaner into an encoder really do anything?
>
> -Dave
>
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