Disklavier

Hi all,

I recently bought a Yamaha U3 (1989) which has a MX100A Disklavier 
instatled on it. I had a question regarding recording. If anyone has 
any advice on this I would greatly appreciate it.

I play the piano & record with it mainly through MIDI. Everything works 
well except for the fact that I always have to have a disk in the drive 
for MIDI to work. If I don't send info to the piano for over 5 mins the 
drive goes into a hibernation mode & turns itself off. This is normal 
for it to do this but it gets annoying as I always have to then press 
the stop key to wake the drive up to reactivate the drive.

Does anyone know if there is a way to stop the drive from hibernating 
after 5 mins. Or to tell it to hibernate after say 1 hour instead of 5 
mins. I heard there was a way of upgrading the MX100 to a DSR1 unit. 
Does the DSR1 still have to have a disk in its drive for MIDI to work?

Thanks for any advice.