There are black traces on the document, Appendix, Glossary introduction index contents top – Fujitsu Ricoh Fujitsu fi-7700 Document Scanner User Manual
Page 154

Chapter 7 Troubleshooting
154
There are black traces on the document.
Are you scanning documents written in lead pencil or
carbon paper?
Yes
When you scan documents written in lead pencil, make sure you clean the rollers
frequently. Otherwise, the rollers will be contaminated which may leave black
traces on the document or cause feeding errors.
For details, refer to
"Chapter 5 Daily Care" (page 104)
.
No
Are the glass and rollers inside the ADF clean?
No
Clean the inside of the ADF.
For details, refer to
"Chapter 5 Daily Care" (page 104)
.
Yes
If the problem persists, check the items in
"7.4 Before You Contact the Scanner
first, then contact the distributor/dealer where you
purchased this product.