Brother MFC-420CN - Manual (Page 133)

TROUBLESHOOTING AND ROUTINE MAINTENANCE 11 - 14
How to improve print quality
Cleaning the print head
To ensure good print quality, the MFC will regularly clean the print
head. You can start the cleaning process manually if needed.
Clean the print head and ink cartridges if you get a horizontal line in
the text or graphics on your printed pages. You can clean Black only
or three colors at a time (Cyan/Yellow/Magenta), or all four colors at
once.
Cleaning the print head consumes ink. Cleaning too often uses ink
unnecessarily.
Caution
Do NOT touch the print head. Touching the print head may cause
permanent damage and may void the print head’s warranty.
1
Press Ink .
2
Press ▲ or ▼ to select Cleaning .
Press Menu/Set .
3
Press ▲ or ▼ to select Black , Color or All .
Press Menu/Set .
The MFC will clean the print head. When cleaning is finished,
the MFC will go back to standby mode automatically.
If you clean the print head at least five times and the print has
not improved, call Brother Customer Service (see Brother
numbers on page i).