Brother MFC-9320CW Service Manual page 153

■ White vertical streaks on one color image
<User Check>
- Check if there is no dust in the gap between the toner cartridge and drum frame.
- Clean the relevant color LED array on which color loss occurs with a soft lint-free cloth.
- Replace the toner cartridge with a new one.
- Check the machine's environment. High temperature and high humidity or low temperature
and low humidity conditions can cause this problem.
- Damp (wet) paper might be used. Try to change to freshly unpacked paper.
- Replace the drum unit with a new one.
Step Cause
1 Condensation
2 LED array failure
Check
Has condensation
occurred inside the
machine?
Is the problem solved
after replacing the LED
ASSY?
3-72
Remedy
Result
Yes Try to print several
pages or leave the
machine 2 hours to
allow it to reach room
temperature.
Yes Replace the LED ASSY.
Confidential