May I back you up one step and ask why you want to turn
off the power? I have an R15, which must be an early
one because there's actually an R10 label under the front
flip-down panel. I never turn it off. I think that would
be a pain. And if you turn it off but it wakes up to record
a show, does it turn itself off again? If not, you would
then be out of sync...which is why you want discrete codes.

I vote for leaving it on.