Canon PIXMA MG4200 Series On-Screen Manual page 91

POWER lamp is off.
Notice for Unplugging the Power Cord
Note
Auto power off feature
You can set the machine to automatically turn off when no operations are performed or no print
jobs are sent to the machine for a certain interval. This is the default setting.
For details on how to change the auto power off setting, see below.
From the machine
About ECO settings
From the computer
Managing the Machine Power
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