FUJITSU IMAGE SCANNER FI-486PRRE - Manual (Page 89)

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3.6 Cleaning the Glass Surface
5. Wipe the both sides of the glass surface using a cloth moistened with cleaner F1.
6. Attach the removable sheet guide in the reverse order of its removal.
7. Lift the Upper transport unit a little to release the safety lock and then lower the
transport unit slowly.