how do you power off your devialet?

[burgundy]

I have my devialet connected to an isolation transformer.
When I turn off my d200, there is still a red light on at the back.
Then I turn off my isolation transformer and that red light shuts off.

Essentially I am unplugging the d200 everytime. 
Anyone powers off this way?  am i harming the d200 by not letting it cool down?

thanks