From the home screen, touch Settings > Device > Maintenance > Out of Service Erase.
Select the Sanitize all information on hard disk check box, and then touch ERASE.
Select a method to erase data.
Start the operation.
Note: This process can take from several minutes to more than an hour, making the printer unavailable for other tasks.
Remove stored information to free up printer memory and avoid printing errors.
Expand the memory capacity of your printer and enable it to print complex jobs and collate large print jobs.