Hi my friend Bob:

Thanks for all these information.
In fact I´m keeping 620 because some cartridge colections that I have.
I think that it is almost impossible to find exactly this drive ,except on YAMAHA .I would like to find one on WEB but even if I find one I think shipping price will be very high.
I disaggre about used keyboard prices in Brazil.We are having high US$ value if compared with Real$( actual currency).Besides,I don´t need a new KB now,since my use is very limited (home hobby).
I´ve already tested OMB Demo;I have also inserted a link to Jos Maas page on my own 620´website.
The last thing is that I do not agree with YAMAHA technicians;of course that they turns the things more complicated for us when they decide to use proprietary or rare components,but we can implement modifications.All drivers work at the same manner.All drives have the same control signals.The differences are around connector types,signal names,etc.It´s tottaly possible co install other components if you make the necessary conversion and adaptation.But you must have this hability and skils.
thanks