Fujitsu fi-5950 Operator's Manual page 166

Symptom 7
Do the lines appear always on the
same location?
Do the lines disappear when scanning
with a lower resolution?
If the problem can not be resolved with this flowchart, refer to
"6.4 Before Contacting a Service Provider."
After checking the items given in section 6.4, contact an authorized
FUJITSU scanner service provider or your dealer.
(*) Refer to "4.5 Cleaning the Transport path and the sensors" on page
146
6.3 Troubleshooting
Vertical lines appear in the scanned image.
YES
NO
YES
NO
Clean the glass surface inside
the ADF. (*)
Set the resolution to a lower
value and scan the document
again.
114.