Hi my printer is a mfc 240c and i changed all the ink cartidges but everytime i try to print or copy anything it stays printing blank pages so what can i do to fix it

You'll have to run the cleaning mode a few times,
to do so you'll have to get into Maintenance Mode.

To do this:
Press MENU then * then 2 then 8 then 6 then 4
This takes some practice and you have to press them all within a few seconds.
If the machine doesn't say MAINTENANCE when you do it press STOP/EXIT and try again.

When in Maintenance Mode:
Press 7 then 6, then press 3, then press BLACK START
It will say Cleaning - this will take some time when it's done it will go back to MAINTENANCE

After it's completed try 0 then 9, this will print out a small Print Quality test page
it should have several rows of each color (Cyan, Magenta, Yellow and Black)
if they still don't look right then run the cleaning mode again and then print another quality page.

Continue to do this until the quality is back to normal,
when you're done to exit maintenance mode press 9 then 9 to return to normal operation.

note: this cleaning mode uses up a fair amount of ink, use sparingly

note: maintenance mode is for brother technicians and has some codes that can damage your machine, only use the codes I've explained in this solution


If this doesn't resolve your issue you may need a replacement print head,
this is an expensive fix if the machine is no longer under warranty.
If it is under warranty contact Brother and they will arrange a meeting with a local technician to repair it for you.