Fujitsu fi-4120C Operator's Manual page 88

Symptom 6
Images are distorted or blurred.
Are the document glass, document
press pad, glass, and white stripe
clean?
YES
Is the ADF cover pressed down or
heavy object placed on the ADF
during scanning?
NO
Is something causing the scanner
to vibrate during scanning with the
ADF?
NO
Is the scanner not installed on a
flat, level surface or is a scanner's
rubber foot missing?
YES
Contact the manufacturer's
authorized service center.
*) The ADF glass, see "Chapter 3 DAILY CARE" (page. 41).
NO
Clean dirty locations. (*)
YES
Do not press down ADF or
place heavy objects on ADF
during scanning.
YES
Do not allow anything to
cause the scanner to
vibrate while scanning.
NO
Install scanner on flat, level
surface or attach rubber foot.