Fujitsu M4099D Reference Manual page 27

Cleaning the Glass Surface (Upper sheet guide assembly)
Open the upper transport unit.
Loosen the two knurled screws at
both ends of the upper sheet
guide assembly to open the
assembly.
2-10
WARNING
Wait at least 3 minutes after turning off the power before cleaning.
ACHTUNG
Warten Sie nach dem Reinigen mindestens 3 Minuten bevor Sie den
Scanner wieder anschalten.
Knurled screws
Upper sheet guide assembly
Wipe both surfaces of the glass
clean with a dry cloth (or
moistened with isopropyl alcohol
or cleaner F1 as necessary).
Close the upper sheet guide
assembly and tighten the two
knurled screws.
Close the upper transport unit.