Solutions
Before you send an A3 size document, ask the recipient if the recipient's machine supports A3 size. If you see OK (Reduced Size) in the fax transmission report, the recipient's fax machine does not support A3 size. You can print a fax transmission report from Fax > (More) > Fax Report > Last Transmission.
Solutions
Make sure the original is placed correctly against the alignment marks.
If the edge of the scanned image is missing, move the original slightly away from the edge of the scanner glass. You cannot scan the area within approximately 1.5 mm (0.06 in.) from the edge of the scanner glass.