Konica Minolta Fujitsu Scanner - Manual (Page 132)

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4.5 Cleaning the Transport path and the sensors
5. Clean the Document sensors on the lower transport path (2 units at 3
locations) using a lint-free cloth moistened with the cleaner F1 or
isopropyl alcohol.
6. Clean the Document sensors on the upper transport path (2 units at 3
locations) using a lint-free cloth moistened with the cleaner F1 or
isopropyl alcohol.
Document sensor
Document sensor