I was searching remote central just a day or so ago for codes for the Momitsu. Well, "Momitsu" got no hits, so I figured I was out of luck.
Now, I may be able to help you anyway. I had an episode a month ago or so where the player just stopped responding to the remote for 2 or 3 hours and I posted for help. The player finally started working again (I flashed BIOSes, etc. etc.). It was suggested that the buttons on the remote are easily stuck - one button can be stuck on if its edge gets caught. So check your buttons and make sure none of them are caught under the lip of the remote body.
I'm in the process of programming my new HTM MX-700, and just got to the Momitsu. I could learn all the codes but I'm trying to determine if there are any discreet codes. I'm going to start a thread and ask. Just discreet on/off codes would be nice, eh?
Good luck...