ERROR MESSAGE I GET A MESSAGE ON MY LCD SCREEN THAT SAYS "UNABLE TO PRINT 51" HOW DO I GET IT TO STOP DOING THAT. . .I HAVE TRIED EVERYTHING POSSIBLE!!!! UNPLUGGING TURNING IT OFF. . BUT IT DOESN'T TURN OFF FROM THE BUTTON. . I HAVE TO DISCONNECT IT FROM THE OUTLET.. .IT HAS NO PROBLEMS.(PAPER JAMS, INK. etc.) CAN SOMEONE PLEASE HELP ME. . THANKS

in my printer brother mfc-7340 when i coping with machine after some time display will show print unable with error code 72 what i will do? plse tell me;

Unplug the printer from power cord.Press and hold the "menu" button, then plug the device.You'll see on the LCD screen a "machine error" code.If this code is 40,41,49 or 4F the print head is defective.If the error is 48 - defective print head cable or circuit board.If the error is 50 or 51 there is error in Purge unit and printer require service.If the error is 46 the waste ink tank is full.Follow this:
Enter 80, then scroll down with the arrow down (round) key. You'll find an entry listed as purge count. If number is over 6000, enter 2 7 8 3.This will reset the purge count value. Then restart the printer, hopefully without the annoying cannot clean message.

Unplug the printer from power cord.Press and hold the "menu" button, then plug the device.You'll see on the LCD screen a "machine error" code.If this code is 40,41,49 or 4F the print head is defective.If the error is 48 - defective print head cable or circuit board.If the error is 50 or 51 there is error in Purge unit and printer require service.If the error is 46 the waste ink tank is full.Follow this:
Enter 80, then scroll down with the arrow down (round) key. You'll find an entry listed as purge count. If number is over 6000, enter 2 7 8 3.This will reset the purge count value. Then restart the printer, hopefully without the annoying cannot clean message.

Unplug the printer from power cord.Press and hold the "menu" button, then plug the device.You'll see on the LCD screen a "machine error" code.If this code is 40,41 or 4F the print head is defective.If the error is 48 - defective print head cable or circuit board.If the error is 50 or 51 there is error in Purge unit and printer require service.If the error is 46 the waste ink tank is full.Follow this:
Enter 80, then scroll down with the arrow down (round) key. You'll find an entry listed as purge count. If number is over 6000, enter 2 7 8 3.This will reset the purge count value. Then restart the printer, hopefully without the annoying cannot clean message.

Do you mean "unable to clean"?If it this follow this instruction.
Unplug the printer from power cord.Press and hold the "menu" button, then plug the device.You'll see on the LCD screen a "machine error" code.If this code is 40,41 or 4F the print head is defective.If the error is 50 or 51 there is error in Purge unit and printer require service.If the error is 46 the waste ink tank is full.Follow this:Enter 80, then scroll down with the arrow down (round) key. You'll find an entry listed as purge count. If numberis over 6000, enter 2 7 8 3.This will reset the purge count value. Then restart the printer, hopefully without the annoying cannot clean message.

Unplug the printer from power cord.Press and hold the "menu" button, then plug the device.You'll see on the LCD screen a "machine error" code.If this code is 40,41 or 4F the print head is defective.If the error is 50 or 51 there is error in Purge unit and printer require service.If the error is 46 the waste ink tank is full.Follow this:
Enter 80, then scroll down with the arrow down (round) key. You'll find an entry listed as purge count. If number
is over 6000, enter 2 7 8 3.This will reset the purge count value. Then restart the printer, hopefully without the
annoying cannot clean message.

More than likely you have a bad printhead, if its under warranty brother will pay to have it fixed, otherwise just play baseball with it and buy another one

here is the solution according to brothers website
http://www.brother-usa.com/FAQs/Solution.aspx?FAQID=100000012648&Sympt=How+do+I+clear+error+message+Print+Unable+36%3f&Model=1208&ProductGroup=1&ProductID=HL4070CDW

Normal 0 Could have a corrupt driver.
Disconnect the printer or at least be sure it is turned off. I'd do both and when the CD software program asks you to connect the printer to the USB port, do so and it should again work properly.
Hope this helps. Bud

my brother mfc-440cn printer says, "unable to print 51" on the screeen after if off (which it woudn't let me do. I had to unplug it. It just won't work.