Fujitsu fi-4860C2 Benutzerhandbuch

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●AP-4
- The deviation in the amount of the light transmitted through background areas 
must not be less than 10%.
HINT
The type and the conditions of document and the conditions sometimes 
cause the double-feed detection rate to drop.
HINT
When the overlapping check is specified, the paper sheets which contact 
closely each other, such as electro-statically charged paper, can result in the 
miss-detection of double-feed.