Disklavier

Greetings to all.  While listening to my MX100II, the piano suddenly went totally dead.  I thought I lost house power!  I have been maintaining my Disklavier electronics (floppy drive, display) while my local tuner maintains the acoustic portion as I have a background in electronics, have all the service literature for my model, proper test equipment, etc.


It is definitely a power supply issue as ALL outputs are 0V with the main power relay closing normally and all fuses are good!  Of course this would happen on a Saturday when Yamaha service is closed!


So before I break out my scope and start trouble shooting, have any of you any prior experience with this power supply or know of known issues?  I did read something about the 20V regulator being operated outside of its rating and shutting down and I will check that today.  Anything else?


Bill B, any first hand experience with this?


Thanks in advance,


Regards,


Mike


Sent from my iPad