Canon imageCLASS MF4450 imageCLASS MF4570dn/MF4450 Basic Operation Guide - Page 143
If a Power Failure Occurs
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If a Power Failure Occurs The machine cannot be used while power supply is cut off. The fax function during a power failure • Documents cannot be sent or received. • You may not be able to make a call using the external telephone depending on your telephone. • You may be able to get a call using the external telephone depending on your telephone. IMPORTANT Data storage for when power supply is cut off Even if power is lost due to a power failure or accidental unplugging, any sent or received documents stored in the memory are backed up for approximately 5 minutes. NOTE Charging the built-in battery It takes approximately 24 hours to fully charge the built-in battery after the machine is turned ON. If the built-in battery has not been charged fully charged, documents stored in the memory may not be properly backed up. 9-11 Troubleshooting