Canon iPF755 User Manual page 734

Control Panel > Operations and Display Screen
The printer mode is indicated as follows.
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*1: The printer automatically enters Sleep mode when idle for a specific period (by default, five minutes), that is, if no
print jobs are received or buttons are pressed while all covers are closed. However, it does not enter Sleep mode
while error messages are displayed.
*2: In Sleep mode, any button can be pressed except the Power button to recover from Sleep mode. Sleep mode is also
terminated if a print job is received or a command is issued from RemoteUI.
Control Panel Display
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iPF755