FUJITSU fi-4120C - Manual (Page 17)

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Do not allow liquids to get inside the scanner.
Do not insert or drop foreign metal objects in to the
scanner.
Do not scan wet document or document with paper
clips.
Do not splash or allow the scanner to get wet.
If foreign objects (water, small metal objects, liquids,
etc.) get inside the scanner, immediately press down
the power button to turn off the scanner and
disconnect the power plug from the power outlet.
Then contact the agent where you bought the
scanner or Maintenance Service Center.
Pay particular attention to this warning in
households where there are small children.