Brother DCPJ525W Service Manual page 120

Random horizontal stains
Step
1 Maintenance unit contaminated
2 Leveler roller (LR) stained
3 Rollers heavily contaminated
User Check
- Check whether the recording paper being used is within the specification.
- Check that recording paper is loaded correctly in the paper tray.
- Print on several sheets of blank paper to clean the related rollers.
- Clean the platen.
Cause
2-75
Solution
Clean the maintenance unit. Refer to
Section 4.2.6.
Clean the leveler roller ASSY with Function code
70. Refer to Chapter 5, Section
Replace the engine unit.
Chapter 2,
1.4.25.
Confidential