Fujitsu fi-7800 Operator's Manual page 66

Fig.2
HINT
● The rate of multifeed detection may drop with some documents.
Multifeed cannot be detected in the area of 15 mm from the leading edge of the document.
● The areas in Fig.1 can be changed in the Software Operation Panel.
For details, refer to Settings Related to Multifeed Detection (page 252).
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How to Load Documents