You see this screen:
4.Select Sleep Timer and press the OK button. You see this screen:
5.Select the time period you want before the product goes to sleep. Then press the OK button.
6.Press the 
home button to exit.
Parent topic: The Power Off and Sleep Timers
Changing the Power and Sleep Timer Settings - Windows
You can use the printer software to change the time period before the printer enters sleep mode or turns off automatically.
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