Replacing Yamaha action with Fatar, is it doable?

Probably not possible.

Hi Michael,

Getting the values of key-presses is normally done by matrix-scan. This should be independent of the brand but actually there can be a difference how the matrix is split and hence the need of distinct (proprietary) electronics. So it is hard to predict if it works. I know for example that the key-beds of Fatar can be interchanged. But even then, please note that there can be key-bed specific functionality (like after touch) that isn't supported by the electronic that belongs to the interchanged key-bed and vice versa.

But.....I've owned a P85 and had a Fatar DIY keybed from Doepfer. I think they can be interchanged because they use the same key-switches (maybe some soldering and please check differences in voltages / resistances) but, like you already said, things really to consider are:
- different positions of screw-holes
- different dimensions, especially height and depth
- different electronics size

But it depends on what you are going to interchange ;-)

Cheers,
Herman

Michael,

Thank you for your kind word of welcome. If you have questions about (re)building a piano you're more than welcome. I've actually tried to build one myself from scratch using a Fatar key-bed and later on a Yamaha P-85 key-bed. Unfortunately this costly mission failed (for both key-beds) but I'm on a Kawai now, which I'm more than happy with.

Regards,
Herman