I performed head cleaning sevaral times but cyan and megenta colours are not printing

> replaced the print head

Did you replace the tri-colour ink-cartridge, or did you replace the print-head mechanism?

Are you sure that the CYAN part of the ink-cartridge is not empty?

have you tried to use the same printer with another computer

try printing the nozzle check page.. you will be able to see which color that is missing... it should have Yellow , Megenta, Cyan and Black... if any one of the color is missing.. try performing head cleaning and after twice cleaning and still no improvement, very high possibility your print head is clogged..

Is your printer picking them up ok if so try cleaning your print heads

1. Press Ink or Ink Management key on the control panel of the machine.
   
   
2. Press 1 to choose 1.CLEANING.
   
   
3. Press the up or down navigation key to choose the Black, Color or All you want to clean, and then press Menu/Set or Set.
   
   
   

The machine will clean the print head automatically. When cleaning is finished, the machine will go back online automatically.

Note If you clean the print head at least five times and the print has not improved, please contact Brother Customer Service from "Contact Us".

take out printheads. unplugg power cable from back press adn hold down 6 and # buttons on pritner at same time while holding them down plugg it back in. then insert printheads one by one. first insert black/yellow shutt the door adn check for message on pritner screen. if it says printhead missing cyan/megenta it means it detected black/yellow printhead. do same with cyan/megenta adn check for message on screen. if you see no error mesage and both printheads were detected fine let the printheads alligned completely. then if u see same issue it is the pritner whgich need to be replaced.

Clean print head it may work properly. else
find out which color not working. replace the color ink cartridge
LC51BK Black color
LC51C Cyan
LC51M Megenta
LC51Y Yellow

I think the problm lies between the ink tank and the printhead. When this passage runs dry, sometimes it takes time for the ink to fill this passage again. Try printing again after a day or two.

The problem is with the print head.
Firstly try cleaning cleaning and more cleaning because it means the nossles are blocked or the head is done for. If after doing a ridiculous amount of cleaning it still doesn't work then a last resort that has worked multiple times for me is to get a syringe without a needle. Remove the color in question and get a cup of boiling water fill the syringe and squirt it in the cradle where the ink gets fed to the head and wait 15 mins then repeat the process a few times. Wipe up any water around the contacts and put the cart back in, then go back to the cleaning. If the problem is not solved after this unfortunatly its time to bin the printer because the time to install and cost of the head is generally more than its worth (Not always but mostly the case)
Hope this fixsya

by blue you mean cyan cart. It could be down to the print head bein glogged up, i would do some deep cleans and make sure the machine is purging ok, If not change print head, If not it could be logic board but i have never had it with the cyan colour only megenta and black.

So printhead so clear your fault