First a great thank you for Keven G. for his precious help. Because of his advice, I was able to calibrate my keyboard without PRC-100 remotre control. really great. I did it several times but it fails to calibrate everything due to a problem I discovered: the key 52 is not working correctly (it moves slowly during the calibration, but it was not strong enough to touch the cord and make the sound. In normal playing mode : the key 52 is not moving at all, or extremely few without making the music! As far as the closest Disklavier technician shall be at least at 2000km from my home, how can find a way to trace and then repair the problem ? I can have at disposal excellent engineers in electronic and electromechanics (I am myself telecom engineer), is not a problem and they
are fluent in English French and Italian, but we do not know how to proceed ! Than you for your help.
Julien