Lexmark MC2640
From the control panel, navigate to:
Settings > Device > Restore Factory Defaults
For non-touch-screen printer models, press to navigate through the settings.
In the Restore Settings menu, select the settings that you want to restore.
Select RESTORE.
Follow the instructions on the display.
Save energy by enabling this feature on your printer.
Print this page to check the current printer settings and locate items in the printer menu system.