How do I adjust the sleep timer or power off timer to save energy?

To change the sleep timer, press the home button, select Settings > Printer Setup > Sleep Timer, and use the arrow buttons to adjust the minutes of inactivity before sleep mode activates. To change the power off timer, select Settings > Printer Setup > Power Off Timer and choose the desired auto-off time interval. Press the home button to exit after making either change. (Page 21)