Brother MFC-9840CDW - Page 80

Confidential
1-61
White vertical lines appear on image
User Check
- Replace the toner cartridge or drum unit with a new one.
Step Cause
Check Result Remedy
1
Dirt on fuser unit Is the heat roller of the
fuser unit dirty?
Yes
Clean the heat roller of the
fuser unit.
2
Foreign substance
or dirt on the paper
feeding path
Is there any foreign
substance or dirt on the
paper feeding path?
Yes
Clean the paper feeding
path.