Fujitsu IMAGE SCANNER FI-4860C Operator's Manual page 94

2. Pull the ADF release lever toward you and lift up the ADF sheet guide.
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3. Hold the ADF sheet guide with your hand to keep it open.
4. Wipe the six sensor surfaces with a 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 a little to release the safety lock and then lower the
transport unit slowly.
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3.7 Cleaning the Sensors