The document was not inserted or fed correctly, or the document scanned from the Automatic Document Feeder (ADF) was too long.
Remove the jammed paper from the ADF unit.
Clear any debris or scraps of paper from the ADF unit paper path.
Check the following points to take out jammed paper:
DCP-L3550CDW, DCP-L5500DN, DCP-L6600DW, DCP-L8410CDW, MFC-EX670, MFC-L2710DN, MFC-L2710DW, MFC-L2730DW, MFC-L2750DW, MFC-L3710CW, MFC-L3730CDN, MFC-L3750CDW, MFC-L3770CDW, MFC-L5700DN, MFC-L5750DW, MFC-L6800DW(T), MFC-L6900DW(T), MFC-L6950DW, MFC-L6970DW, MFC-L8690CDW, MFC-L8900CDW, MFC-L9570CDW(T), MFC-L9577CDW, MFC-L9630CDN, MFC-L9635CDN, MFC-L9670CDN