I have to do a print-clean diagnostic to get print

printers will only print black and white unless you change the print settings to be color
before you go to print find the printer settings or options and make the default setting color
that way it will print exactly what is sent from the computer to the printer

1. Print a Print Quality Check Sheet.
   
   
2. Press the Ink or Ink Management key on the control panel.
3. Press the up or down arrow key to choose Test Print and press OK.
4. Press the up or down arrow key to choose Print Quality and press OK.
5. Press Color (Colour) start. The machine begins printing the Print Quality Check Sheet.

1. Closely examine the Print Quality Check Sheet. Each of the four colors is represented by a slanted square pattern made up of individual blocks. The colors should appear in the following order from left to right: Black - Yellow - Cyan - Magenta.
   
   
2. Compare the print quality of the Check Sheet you just printed with the three examples listed below:
   
   (A) One or more complete blocks of colors are missing:
   
   
   (B) Most of the short diagonal lines are missing from one or more color blocks:
   
   
   (C)Some parts of the short diagonal lines are missing from one or more color blocks:
   
   
   
3. The display will then ask you if the print quality is OK for black. Press the down arrow key or 2 or "-" to choose No for black with the problem.
4. The display will then ask you if the print quality is OK for Color. Press the down arrow key or 2 or "-" to choose No for color with the problem.
5. The display will then show Start Cleaning? Yes No.
   Press the up arrow key or 1 or "+" to choose Yes and the machine will start cleaning the color ink cartridges.
6. When the machine completes cleaning the print head, press Color(Colour) Start. Another Print Quality Check Sheet will print.
   
   
7. Repeat the cleaning and the quality check process following the Step 4-7.

Clean the Printhead & Print a test page by doing the ff:

1. Press the Ink button press the Up or down arrow key to select Test Print, then select Print Quality press OK and press Black or Color START. Check all the colors including the black & check if there are any missing dots and if there are any colors not printing correctly.

2. Press the Ink button on the control panel and select CLEANING press OK.

3. Press the up or down arrow key to select Color press ok and press Black Start.

*After the cleaning process the printer will ask you if the quality is OK, press up or down to select yes or no, and it will ask you whether black or color is ok, once you have selected you're answer press Black or Color START to print another test page. Compare the 1st and 2nd test page if it's improving, you may need to do this 3-5 times or until you get a better quality

Hope this helps Please rate if it worked Thanks!

If the yellow ink is not printing here's what you can do:

Clean the Printhead & Print a test page by doing the ff:

1. Press the Ink Management button press the Up or down arrow key to select Test Print, then select Print Quality press OK and press Black or Color START. Check all the colors including the black & check if there are any missing dots and if there are any colors not printing correctly.

2. Press the Ink Management button on the control panel and select cleaning press ok

3. Press the up or down arrow key to select Color press ok and press Black Start.

*After the cleaning process the printer will ask you if the quality is OK, press up or down to select yes or no, and it will ask you whether black or color is ok, once you have selected you're answer press Black or Color START to print another test page. Compare the 1st and 2nd test page if it's improving, you may need to do this 3-5 times or until you get a better quality

Hope this helps.

Rate if it worked Thanks!

If the cyan or the blue ink is printing out in purple here's what you can do:

Clean the Printhead & Print a test page by doing the ff:

1. Press the Ink Management button press the Up or down arrow key to select Test Print, then select Print Quality press OK and press Black or Color START. Check all the colors including the black & check if there are any missing dots and if there are any colors not printing correctly.

2. Press the Ink Management button on the control panel and select cleaning press ok

3. Press the up or down arrow key to select Color press ok and press Black Start.

*After the cleaning process the printer will ask you if the quality is OK, press up or down to select yes or no, and it will ask you whether black or color is ok, once you have selected you're answer press Black or Color START to print another test page. Compare the 1st and 2nd test page if it's improving, you may need to do this 3-5 times or until you get a better quality

Hope this helps Please rate if it worked Thanks!

Follow these steps to check the print settings for your print job.

1. In the software program you are trying to print from, click File and then click Print . The Print dialog box opens.
2. Select your product, and then click Properties . The printer Properties dialog box opens.
3. Click the Printing shortcuts tab.
4. Under Printing shortcuts , click the type of job you are trying to print.
5. Review the following options, and then make any necessary changes.
   • Paper size : Make sure that the selected option matches your paper size.
   • Paper type : If one of the options matches your paper type exactly, select that option.
   • Print quality : If you are not satisfied with your printed page quality, or want more densely printed prints, increase the print quality. To print more quickly, or for lighter prints, decrease the print quality.
6. Click the Features tab.
7. Check the Print in Grayscale setting
   • If you are trying to print in color, select Color Options , and then make sure that Print in Grayscale is not selected.
   • If you are printing a black and white image, select Print in Grayscale to fix streaking in black areas.
8. Click OK , and then click OK again to start the print job.

Make sure the printer is loaded with unused white paper.
Open HP Solution Center , then click Settings , then Printer Toolbox .
Select the Services tab.
Click Print PQ (print quality) Diagnostic Page .

Make sure the printer is loaded with unused white paper.
Open HP Solution Center , then click Settings , then Printer Toolbox .
Select the Services tab, then click A- Click Align Printheads or
B- Click Clean Printheads .
C- Click Calibrate Linefeed .

If, after repeated printhead cleaning, the Print Quality Diagnostic page shows white lines across the color blocks in Test Pattern 2 (but no white lines in the gray blocks in Test Pattern 3), one or both of the printheads will have to be replaced. The Print Quality Diagnostic page shows which printhead should be replaced.









Try using the HP Scan Diagnostic Utility in Windows - HP Customer Care (United States - English)

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.

You said you just replaced the ink jets. Did you clean the print heads? Here is Link on Web. If you find this helpful pls rate me. Thanks
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).

If you are sure the diagnostics show the colours correctly, one thing I would look at is to see if it had a colour profile set up for it.Don't know whether this printer normally has, if it has not I would suggest reinstalling the driver. To check - Start/Printers & Faxes/ Rt click on printer then properties, look under Colour management tab. Pete