Fujitsu FI-5530C2 Operator's Manual page 156

HINT
140
•
When the overlapping check is specified, the papers which contact
closely each other, such as glued paper or electro-statically charged
paper, can result in the miss-detection of multifeed.
•
Normally multifeed detection will monitor the following area of the
document.
Front side
Feeding
direction
35
Top of paper
Bottom of paper
Center of paper
(Unit : mm)