Brother MFC-J680DW Basic User's Manual page 72

Difficulties
Dialing does not work.
(No dial tone)
Poor sending quality.
Vertical black lines
when sending.
Related Information
• Choose the Correct Receive Mode on page 28
• Clean the Scanner on page 39
Suggestions
Check all line cord connections.
Change Tone/Pulse setting. (Available only for some countries)
Try changing your resolution to Fine or S.Fine.
Make a copy to check your machine's scanner operation. If the copy
quality is not good, clean the scanner.
See Related Information: Clean the Scanner at the end of this section.
Black vertical lines on faxes you send are typically caused by dirt or
correction fluid on the glass strip. Clean the glass strip.
See Related Information: Clean the Scanner at the end of this section.
56