If you are using the Automatic Document Feeder (ADF) for faxing, place your original document face up. If you are using the scanner bed, place your original document face down.
For more information, you refer to the Lexmark Pro705 User's Guide. If you are using Windows, you can access it by going to the Start menu -> Programs -> Lexmark -> Pro700 Series -> View User's Guide.
To download the user's guide for free, click on this link Lexmark Pro700 Series User's Guide
I hope this information has been helpful. Thanks.