Fujitsu fi-4860C Operator's Manual page 18

Do not use aerosol sprays near the scanner.
Do not use aerosol sprays, for example, to clean the scanner. Air sprayed
from aerosol sprays causes dirt and dust to enter the scanner, resulting
scanner failure and malfunction.
Avoid any contact when scanner is in use.
Avoid any contact when scanner is operating 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's sake.
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 heat to build up inside the scanner, causing fire or
scanner trouble. Install the scanner in a well-ventilated location.
●xvii