My copy prints come out blurry after changing ink cartiges

Try this:
Checking the print quality:

1. Press the Ink or Ink Management key on the control panel.
2. Press the up or down navigation key to select TEST PRINT and press Menu/Set or Set.
3. Press the up or down navigation key to select PRINT QUALITY and press Menu/Set or Set.
4. Press Color (Colour) Start. The MFC/DCP begins printing the Print Quality Test Sheet.
5. By reviewing this Test Sheet, you can determine if the print quality needs improvement.
6. Closely examine the print quality of the four color blocks that are formed by short diagonal lines on the Test Sheet.
   If all lines are clear and visible, press 1 (YES) and press Stop/Exit.
   If you can see missing short lines, press 2 (NO) and go to Step 7.
7. The display will then ask you if the print quality is OK for black and three colors. Press 2 (NO) for black or three colors with the problem.
8. The display will then show START CLEANING? 1.YES 2. NO.
   Press 1 (YES) and the MFC will start cleaning the color ink cartridges.
9. After the cleaning is finished, press Color (Colour) Start. The MFC/DCP will print another Print Quality Test Sheet.
10. If you can see missing short lines in any of the four color blocks press 2 (NO) and repeat the quality check and cleaning process. Repeat this procedure at least 5 times if print quality remains a problem. If short lines are still missing after the fifth cleaning and test print, replace the necessary ink cartridges. If the print quality of the 4 color blocks is OK, press 1 (YES).