Canon MG3500 Series Online Manual page 62

Important
When you unplug the power cord after turning off the machine, be sure to confirm
that the ON 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.
Managing the Machine Power
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