Thank you EH man, now it is clear.
The bigger problem now is to replace the keyboard foil. I’m indecied if replace it with a “silver back card” (like the man of the pink EH0400) or clean the original foil with a white oil or something else.

Hi all.
Me and an expert luthier we are trying to give a new life to the eh0400. It lives now but with some triggering problems and not with the complete features.
So, i ask you a little help:
– where (and what a kind of) I can buy the “Q” switch that is broken?
– We don’t understand how the keyboard works.. Why conductive? why conductive stripes on a plastic foil? I don’t see anything that close the circuit. I want to replace it but i don’t know where find that material..
If someone have the manual i would be very grateful if he send it to me. Also via mail ema@gringoise.com.
thank you in advance The improvements will be well documented in this forum.

Hi all.
I bought an EH-0400 an I’m very enthusiastic about this synth, I love it.
It works fine, but it have some triggering problems and it need some little repair.
Someone that have it can kindly post the instruction manual?
Please please please! I will be very grateful.