Power Switch - Canon ImageRunner iR8500 Series Service Manual

The machine is equipped with two power switches: main power switch and control panel power switch. It is turned on when the main power switch is
turned on; to end power save mode, low power mode, or sleep mode, turn on the control panel power switch.
[1] Control panel power switch
[2] Main power lamp
[3] Main power switch
Do not turn off the main power while the progress bar is displayed, indicating that the HDD is being accessed. Otherwise, the HDD can suffer a fault (E602).

1.2.3.3 Power Switch

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