Canon TR4700 Series Online Manual page 112

The power cannot be turned off while the printer is sending or receiving a fax, or when unsent faxes
are stored in the printer's memory. Make sure the printer has finished sending or receiving faxes
before turning it off.
Remember that faxes cannot be sent or received while the printer is off.
Unplugging the printer will reset the date/time setting and erase all documents in the printer's
memory. Send faxes or print documents as needed before unplugging the printer.
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