please contact xerox to obtain a new spar firmware , there is an error in yours
its fixed in :
061.121.221.14500 1128820 Windows 7 SMB scanning is giving unknown error.
but at the moment we are already at level : 061.121.221.29800
I have a Xerox WC 7545 Color Printer I m Printer problem SMB scan, for Win7 need help
Thanks for sea