Image superimpose

Hi,

We have big problem with scanner Fujitsu fi-4990C and IBM Netvista
workstation and Adaptec 29160 SCSI card.
I have a batch to made of numbered sheet (1..100).
I am scanning this batch with ADF and i.e. fiftieth image is "phantom"
(fragment i.e. twenty first and twenty second).
Thanks for help.

Regards
Bart