Brother MFC-J6510DW Service Manual page 104

Random missing dots
Step
1 Maintenance unit contaminated
2 Carriage PCB defective
3 Clogging in the maintenance unit
4 Print head defective
5 Power supply PCB defective
6 Main PCB defective
White horizontal streaks
Step
1 Maintenance unit contaminated
2 Inclination of head not adjusted
3 Head calibration data not written
4 Paper feeding correction value not
updated
5 PF encoder disk stained or
scratched
6 Carriage PCB defective
7 Clogging in the maintenance unit
8 Print head defective
9 Main PCB defective
User Check
- Check that ink remaining is insufficient.
- Perform head cleaning.
Cause
User Check
- Check if ink remaining is sufficient.
- Perform head cleaning.
Cause
2-74
Solution
Clean the maintenance unit. Refer to
Replace the carriage PCB ASSY.
Replace the maintenance unit.
Replace the head/carriage unit.
Replace the power supply PCB ASSY.
Replace the main PCB ASSY.
Solution
Clean the maintenance unit. Refer to
Adjust the inclination of the head/carriage unit.
Refer to Chapter 4, Section
Perform head calibration. See Function code 02.
(Refer to Chapter 5, Section
Update the paper feeding correction value. Refer to
Chapter 5, Section 5.1.4.16.
Replace the PF encoder disk and clean the flushing
guide. (Refer to Chapter 3, Section
Replace the carriage PCB ASSY.
Replace the maintenance unit.
Replace the head/carriage unit.
Replace the main PCB ASSY.
Section 2.4.2.4.
Section 2.4.2.4.
4.1.
5.1.4.2.)
3.1.)
Confidential