Canon i-SENSYS MF3010 User Manual page 26

Cancellation is processing after the [
Sleep state
"Energy Saving Functions (Sleep Mode)"
The toner cover is open.
A service error has occurred.
"When a Service Error Has Occurred"
Resetting the settings
Setting value limit display
(For each copy setting, the display turns off when an attempt is made to exceed the upper or
lower setting limits by pressing the [ + ] or [ - ] keys.)
] key was pressed.