Sony SACD 5400 ES: how to get it in standby ?

Turn it off with the remote.

I never turn my 5400 off. With no cd loaded the laser is off and the motor is off. Only the electronics stay powered up which is better than turning it on and off. I had a 777es which was never turned off in 10 years

I never turn off my XA5400ES either. This is one player that I noticed takes a very long time to warm up, and sounds noticeably better after warmed up.

Thanks for the comments.
I tried to go to standby with one touch, from either the remote or the chassis on/off button. Both turn the unit off ( click!) rather than put it in standby- as claimed in the Sony manual. Contrary to what the manual says, it seems standby doesnt exist.A pity since it uses less power in that imaginary state- according to the manual....
I think I will just leave it on since I agree it sounds better warmed up.

As far as I can tell the only way to completely turn off the unit is to pull the plug. The on/off button on the remote and the player puts the unit in standby. It doesn't matter how long you hold the button down the unit will click into standby.