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8.5 Double-feed Detection Conditions
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Detection by Document Length
Sheets of the same length shall be set in the ADF at a time.
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Document length deviation: 1% or less
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Printed area: 12% or less
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No black printed areas are allowed at the center area
(26 x 10mm) at the leading edge of the document.
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Punched holes are not allowed within 35mm of the vertical
center line of the document.
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The deviation in the amount of the light transmitted through
background areas must not be less than 10%.
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