Canon PIXMA MX310 - Manual (Page 11)

7 Before Using the Machine
z Screen-saver Mode
The LCD goes out if the machine is not operated for about five minutes*.
Perform a print operation to restore the display.
* You cannot change the wait time before the LCD goes out.
Note
When you want to restore the display, perform any operation such as copying, faxing, or scanning,
or press any button except for the ON/OFF button. When you press the ON/OFF button while the
machine is in Screen-saver mode, the machine turns off.