You can modify the power saver time-out, but I do not know of a way to set up the machine to turn itself off at the end of the day as you would like. Modifying the power saver setting will allow the machine to go into sleep mode, which uses just enough power to keep the printer ready to come to life for the next job - whenever that may be. Here are the steps to change the setting if you would like to try it.
We use the color printer Phaser 6280 at work and want to know if the machine can auto shut off every day at 5.00 pm when everyone leaves work. If so, how do I set it up.