Fujitsu FI-4860C Operator's Manual page 20

Do not use aerosol sprays near the scanner.
Do not use aerosol sprays to clean the scanner. Aerosol sprays cause dirt
and dust to enter the scanner, resulting in scanner failure and malfunction.
Avoid any contact when the scanner is in use.
Avoid touching any part of the scanner mechanism or paper when
scanning as this may cause injuries.
Disconnect the power plug from the power outlet when the scanner is
not used for a long period of time.
When the scanner is not used for a long period of time, be sure to
disconnect the power plug from the power outlet for safety.
Do not install the scanner in the direct sunlight.
Do not install the scanner in the direct sunlight or near heating apparatus.
Doing so might cause excessive heat to build up inside the scanner,
causing fire or scanner trouble. Install the scanner in a well-ventilated
location.
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