Fujitsu fi-4860C Operator's Manual page 95

2. Pull the ADF release lever toward you and lift up the ADF sheet guide.
3. Hold the ADF sheet guide with your hand to keep it open.
4. Wipe the six sensor surfaces with a clean lint free cloth moistened with cleaner F1.
Document width sensor(in 6 locations)
5. Lower the ADF upper sheet guide gently.
6. Lift the Upper transport unit fully to release the safety lock and then lower the
transport unit carefully.
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3.7 Cleaning the Sensors