Colors do not print clearly. Black is OK. Have run several cleaning processes to no avail.

Make sure all the protective tape on the Black cartridge has been removed. Also are the inks re-filled? I have seen many re-filled cartridges fail in a similar maner.

I ran this process two months ago when the printer was 4 months in use.
Try running through the manual cleaning process for the print heads.
1-press ink
2-choose cleaning
3-choose ALL. If that doesnt work try cleaning BLACK only.
when the cleaning finishes the machine will go back to standby mode automatically.
see pg 172 in users manual under routine maint.

If the colors print OK, you could try cleaning the black nozzles. (Your machine may allow you to clean just the black or the colors, or all the nozzles).

1) Press the <Ink> or <Ink management> key

2) Use <Up> or <Down> arrows to navigate to "Cleaning" and press <OK>

3) Use <Up> or <Down> arrows to navigate to color that needs cleaning, or "All" and press <OK>

4) The display will show "Cleaning" and "Please wait"

5) After completion, the printer should be ready

If the problem persists, brother advises that you may need to repeat the process up to four times. If still no results, contact brother customer service.

Found this on the web. Click on link below to print the entire manual out to keep. Below are steps to do cleaning. If you find this helpful pls rate me. Thanks and Good Luck.

http://www.brother-usa.com/ModelDocuments/Consumer/Users%20Manual/UM_MFC_210C_420CN_EN_286.PDF

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).
Checking the print quality
If faded or streaked colors and text appears on your output, some of the nozzles may be clogged. You can check this by printing the Print Quality Check Sheet and looking at the nozzle check pattern.
1 Press Ink.
2 Press ▲ or ▼ to select Test Print.
Press Menu/Set.
3 Press ▲ or ▼ to select Print Quality.
Press Menu/Set.
4 Press Color Start.
The MFC begins printing the Print Quality Check Sheet.
5 Check the sheet to see if the quality is OK by following these steps:
Color block quality check
The LCD shows:
6 Check the quality of the four color blocks on the sheet.
7 If all lines are clear and visible, press 1 (Yes), and go to Step 10.
—OR—
If you can see missing short lines as shown below, press 2 (No).
The LCD will ask you if the print quality is OK for black and three colors.
OK Poor
Is Quality OK?
1.Yes 2.No
Black OK?
1.Yes 2.N
8 Press 2 (No) for Black or three colors
with a problem.
The LCD shows:
Press 1 (Yes). The MFC will start cleaning the print head.
9 After cleaning is finished, press Color Start. The MFC will start
printing the Print Quality Check Sheet again and then return to
step 5.
10 Press Stop/Exit.

Found this on the web. Click on link below to print the entire manual out to keep. Below are steps to do cleaning. If you find this helpful pls rate me. Thanks and Good Luck.

http://www.brother-usa.com/ModelDocuments/Consumer/Users%20Manual/UM_MFC_210C_420CN_EN_286.PDF

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).
Checking the print quality
If faded or streaked colors and text appears on your output, some of the nozzles may be clogged. You can check this by printing the Print Quality Check Sheet and looking at the nozzle check pattern.
1 Press Ink.
2 Press ▲ or ▼ to select Test Print.
Press Menu/Set.
3 Press ▲ or ▼ to select Print Quality.
Press Menu/Set.
4 Press Color Start.
The MFC begins printing the Print Quality Check Sheet.
5 Check the sheet to see if the quality is OK by following these steps:
Color block quality check
The LCD shows:
6 Check the quality of the four color blocks on the sheet.
7 If all lines are clear and visible, press 1 (Yes), and go to Step 10.
—OR—
If you can see missing short lines as shown below, press 2 (No).
The LCD will ask you if the print quality is OK for black and three colors.
OK Poor
Is Quality OK?
1.Yes 2.No
Black OK?
1.Yes 2.N
8 Press 2 (No) for Black or three colors
with a problem.
The LCD shows:
Press 1 (Yes). The MFC will start cleaning the print head.
9 After cleaning is finished, press Color Start. The MFC will start
printing the Print Quality Check Sheet again and then return to
step 5.
10 Press Stop/Exit.
There is more, but too long to put here.

With Epson, You must use Genuine Epson Cartridges. This is what happens, when they are not.

Epson has it rigged, that way. Believe me, I have learned from experience.

If they are Genuine, then I suggest, use a new cartridge. See what happens.

Most of the Epson, are always on Sale, for a good price. It would cost most to take it to a repair shop.

Good Luck.....

If you have carried out 4 to 5 head cleans, waited about 8 hours anddone another 3 or head cleans doing nozzle checks after each clean (asrecommended by the manual) and there is still no improvement then youwill need a third party head cleaning solution such as this one:
http://websites.uk-plc.net/UK_Inkjet_Cartridges_PLUS/products/Print_Head_Cleaner.htm
Other makes & brands are available just google "inkjet head cleaning solution" Hope this helps.

Assuming genuine ink cartThis worked for me on a HP printer 1.Try print black text ,and run many copies black only. I ran 25x12 times still no black. Run head clean after about each 50 sheets. Persevered and finally BLACK ink OK
Good Luck Inkypete

you have miss regrestion there are several ways to correct this process 1-go into service mode -function-clear-dc con -ok then take machine off unlug from wall outlet replug turn machine on 2-replace your itb assy. 3-there is another way but you have to be next to the machine and fimilar with second level service mode.

OK, Canon will hate me for posting this!!!!!

Remove cartridges.
Remove print head.
Go to sink or tub (stianless steel, not pastic type), pick up roll of paper towel on the way.
Fold several layers of paper towel and place on flat surface.
Run HOT water till HOT.
Turn hot water to dribble.
Run hot water through print head, careful not to wet contacts.
When water is clear coming through print head, place print head on paper towel.
Repeat process until no colour on paper towel.
DAB print head (DO NOT WIPE) inside and out to dry.
You may wish to let print head air dry overnight but I replace it after drying.
Replace print head in printer and replace cartridges.
Start printing again
I do this on all my Canon printrs every 6 months