Canon iR4570 Series Service Manual page 182

Press on the control panel
power switch (3 sec or more)
HDD
protection check mode
HDD
protection execution mode
Main power switch off
F-4-14
Moves to the shut-down sequence.
Indicates the job being executed, and informs the
user that it will start the shut-down sequence.
Cancels any job on wait in print mode.
Cancels any job on wait in print mode.
Cancels any job being executed in fax mode.