Fujitsu fi-434PR User Manual page 18

As shown in the above figures, press a cloth against the edge and
base of the shutter part and wipe out dirt.
Check that the dirt is wiped out and gently return the
3
imprinter to its original position.
[DAMAGE]
Use a cloth that is either dry or dampened with water when you clean the imprinter.
Use of the F1 or F2 cleaner may damage the imprinter.
Shutter part
Base
Check whether the base is
cleaned completely.
16
Edge