My repairman never found out the problem nor did he ever hear word from Yamaha as to whether they were able to fix the same problem on a keyboard that they had.

It is very intermittent. I originally had the problem at a show about 7 months ago. It repeated itself at home with a different power supply, and I brought it in. The repairman could not figure it out. He did use heat and cold to see if he could expose the problem.

Outside of the phenomenon repeating itself once again at home, it didn't happen again for about six months. I had left the keyboard on at home, and when I returned, the keyboard was going on and off repeatedly. So I brought it in and, again, the repairman and Yamaha cannot figure out what's going on. The main problem is that the problem will not repeat while it is at the repair center. My tech saw it occur once, but it would not reoccur while the keyboard was opened up.

So the keyboard is home now, and it is working fine - for now. I'm not very confident about it as a backup. I don't know what I'm going to do if I cannot get it fixed before it's time to sell it when the PSR3100 comes out.

Thanks for asking.

Beakybird