How to scan A3 size documents varies depending on the scanner model.
- iX1600/iX1500/iX1400/iX1300/iX500/iX100/S1100i/S1100
Refer to:
ScanSnap Help
(Select the model name of the ScanSnap at the top of the page) - SV600
You can scan A3 size documents or smaller without changing any settings.