Brother DCPJ525W Service Manual page 115

Random missing dots
Step
1 Maintenance unit contaminated
2 Carriage PCB defective
3 Maintenance unit defective
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 disc stained or
scratched
6 Carriage PCB defective
7 Maintenance unit defective
8 Print head defective
9 Main PCB defective
User Check
- Check that ink remaining is sufficient.
- Perform head cleaning.
Cause
User Check
- Check whether the Draft mode is selected.
- Check that ink remaining is sufficient.
- Perform head cleaning.
Cause
2-70
Solution
Clean the maintenance unit. Refer to
Section 4.2.6.
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
Section 4.2.6.
Adjust the inclination of the head/carriage unit.
Refer to Chapter 4, Section
Perform head calibration with Function code 02.
Refer to Chapter 5, Section
Update the paper feeding correction value with
Function code 58. Refer to
1.4.17.
Replace the PF encoder disc 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.
Chapter 2,
Chapter 2,
1.4.
1.4.2.
Chapter 5, Section
1.
Confidential