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> From: rob.ocelot@...If you have a scope, make sure you see good clean 0 to 5V signals on the
>
> I finally had a chance to look at this and some of the
> conductive trace on the membrane tail had flaked off. Very
> easy to do if you are repeatedly plugging and unplugging the
> tail from the connector -- but fairly easy to fix with some
> conductive ink (I used a copper based ink from a car defogger
> repair kit). Thanks, Paul.
>
> Both membranes are working fine but a few left panel board
> problems have cropped up:
>
> Osc 1 PW, Osc 2 PW and PWM, Sweep Rate, Sweep Depth, and
> Keyboard tracking silders don't work.
> Master volume slider at lowest point still has volume
> filter cutoff slider curiously affects both cutoff and sweep rate!
>
> My first thought is that the 4051 multiplexers are damaged
> but I swapped them from another left panel board and the same
> problem remains. My second thought is it's actually a right
> panel board issue but other than the single 4051 on the right
> board I'm not sure where else to look.
>
> Every slider was desoldered and tested working or revived.
> Right panel sliders all appear to be functioning normally. I
> double checked the panel board interconnect and that is fine.
> I have a second complete top panel that works as expected so
> I'm pretty sure the problem is confied to the panel boards.