Brother MFC-8220 Service Manual page 217

I-9 White vertical streaks
User Check
(1) Try to wipe the scanner window with a soft cloth.
(2) The toner cartridge may be damaged. Install a new toner cartridge.
(3) Check the machine's environment. High temperature and high humidity
conditions can cause this problem.
(4) Damp (wet) paper might be used. Try to change to freshly unpacked paper.
Possible cause Step
Dirt on the CIS. 1
Dirt on the white
2
tape.
Transfer failure 3
Condensation 4
I-10 White horizontal stripes
User Check
(1) Check the paper used meets the recommended paper specifications. A rough
surfaced paper, damp paper or thick media can cause the problem.
(2) Check that the appropriate media type is selected in the printer driver.
(3) The problem may disappear by itself. Try printing multiple pages to clear this
problem especially if the machine has not been used for a long time.
(4) The drum unit may be damaged. Install a new drum unit.
Possible cause Step
Developing bias 1
contact failure
Check
Is there any dirt on that?
Is there any dirt on that?
Is the transfer roller scratched?
Has condensation occurred
inside the machine?
Check
Are the developing bias
contacts between the machine
and toner cartridge dirty?
6-39
Result Remedy
Yes Replace the CIS.
Yes
Clean the white tape.
Yes Replace the drum unit.
Yes Try to print several pages or
leave the machine 2 hours to
allow it to reach room
temperature.
Result Remedy
Yes Clean the electrodes
at both sides.
MFC-8220
SERVICE MANUAL
Ground
contacts
(4)