You can try adjusting the buckle for each tray individually. Check the Adjustment & Settings section of the manual for a loop adjustment (05-452-x). ...
If you think the problem resides with the mirror drive, remove the scanner motor and rotate the drive manually. You should be able to identify rough...
Were you trying to use the same IP and print from the old drivers? Maybe the driver uses hostname, not IP? Can you print directly from your laptop? ...