Yamaha CS80

Hmmm Odd.

The other thing that I'd be inclined to check is that any through hole 
connections on the board are all in tact.
Occasionally I've come across PTH where the plating has become damaged 
and the two sides of the board are no longer connected.
This can result in floating connections that can manifest as spurious DC 
voltages where they shouldn't be any.

On 19/05/2013 11:31, joachim.milson wrote:
>
>
>
> Thanks Bob for your answer.
>
> I already cleaned the boards and sensors carefully.
> The contacts are very clean. I did it very carefully under a 
> magnifying lens. Also, I changed the sensor with an other one but the 
> issue is still there. So on my opinion, the problem is the PCB itself.
>
> Joachim
>
> 



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