Canon imageCLASS D550 - Manual (Page 97)

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Tr
oubleshooting
The machine cannot be used while power supply is cut off.
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.
If a Power Failure Occurs