Are you scanning documents written in lead pencil?
Yes
No 
Are the glass and rollers inside the ADF clean?
No
Yes
When you scan documents written in lead pencil, make sure to clean the rollers frequently. Otherwise, the rollers will be contaminated which may leave black traces on the document or cause feeding errors.
For details about cleaning, refer to "Chapter 6 Daily Care" (page 108).
Perform cleaning.
For details, refer to "Chapter 6 Daily Care" (page 108).
If the problem persists, check the items in "8.4 Before You Contact the Scanner Service Provider" (page 149) first, then contact your FUJITSU scanner dealer or an authorized FUJITSU scanner service provider.
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