Canon imageRunner 6020 Reference Manual Reference Manual page 23

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Turn OFF the control panel power switch for safety when the machine will not be used
for a long period of time, such as overnight. Also, turn OFF the main power switch,
and disconnect the power cord for safety when the machine will not be used for an
extended period of time, such as during consecutive holidays.
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Do not place your hand in the part of the tray where stapling is performed when a
finisher is attached, as this may result in personal injury.
Important Safety Instructions xxi