The machine has a mechanical issue. Turn the machine off, and then turn it on again.
If the issue continues, call Brother customer service.
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If your Brother machine has 2-Sided(Duplex) Scanning feature:
Document might be too long for 2-sided(duplex) scanning. Press (Cancel), and use the suitable size of paper for 2-sided(duplex) scanning.
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If your machine has FAX function:
We recommend transferring your faxes to another fax machine or to your computer before turning off the power switch.