Konica Minolta Fujitsu Scanner - Manual (Page 131)

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4.5 Cleaning the Transport path and the sensors
4
DA
IL
Y
C
A
R
E
3. Clean the Skew-detection sensor on the lower transport path (7 units at 1
location) using a lint-free cloth moistened with the cleaner F1 or
isopropyl alcohol.
4. Clean the Skew-detection sensor on the upper transport path (7 units at 1
location) using a lint-free cloth moistened with the cleaner F1 or
isopropyl alcohol.