Acquiring image with proper positioning on page

The image that I capture is not properly positioned on the page. The top/bottom and sides are cut off depending on which way - upside down or right side up - I scan the document. I know that several of you have no problem with the positioning but try as I might, I am not sure of the options that I can use to reduce, if need be, the image on the scanned page. I am using a Fujitsu FJ-5120C which is a work horse in the business industry and I am not sure if there may be adjustments on the scanner itself which I can make to effect the change necessary to have the image appear properly. Furthermore, I am using the SCSI interface for transfers.

I am using 13.1 KDE 32-bit machine with XSane software at the time. Thanks.