Canon imageCLASS MF4690 imageCLASS MF4690 Basic Operation Guide - Page 255
If a Power Failure Occurs
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If a Power Failure Occurs If power is suddenly lost due to an outage or accidental unplugging, a built-in battery retains the user data settings and the speed dialing settings. Any sent or received documents stored in memory are backed up for about 30 minutes. During a power cut, functions are limited as follows: - You cannot send, receive, copy, scan, or print documents. - You may not be able to make telephone calls using an external telephone, depending on the type of telephone you use. - You can receive telephone calls using an external telephone depending on the type of telephone you use. To fully charge the built-in battery, it takes approximately 12 hours when the main power switch is on. If the built-in battery is not fully charged, the data may not be saved properly. 11-32 Troubleshooting
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