Question about Brother MFC 7420 All-In-One Laser Printer

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After installing new drum in my MFC=7420 the computer does not recognize the printer. what can I do?

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Turn off your computer. Turn off the printer and disconnect the usb cable. Turn on the computer allow it to boot up fully. turn on the printer, then plug the USB cable into it. The computer will soon say 'found new hardware' Give it a minute and the computer will have recognized your printer again. Make sure your 7420 is set as the default printer.

Posted on Jul 05, 2010

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1 Answer

How do i fix a brother mfc-7420. when it says toners life has ended. we have tried to put new toner and drum in it. with no help. we need to clear the message


check the paperwork that came with the drum unit. Usually there is a sequence you need to follow to clear the drum message such as starting the printer with the front door open. These instructions are shipped with a new drum when you buy an orignal brother drum. If you puchased a refurbished or 3rd party drum you need to talk to your vendor as they should supply these instructions.

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My Brother MFC 7420 said drum end soon, so I ordered a new drum. Then I waited for something to go wrong before I replaced it. Basically I was looking for a deterioration in print quality. I waited and waited. I think it was over 3 years. I replaced the toner a few times. While the print quality never really went done, the frequency of other problems finally shot up. When I replaced the drum the problems went away. My advice -- ignore the warning unless you have other problems.

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go online type in Brother MFC-7420 reset and follow details

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Brother MFC-7420 printing light after installing new cartridge


It could be an issue with the drum unit either being faulty or the internal drum counter having been reset sometime after a new drum was installed. I would recommend removing the currently installed drum unit and trying it in the second printer you mentioned with the toner cartridges that has been confirmed as working.

If the problem persists it is likely to be a froblem with a fuser or another internal part that is not traditionally a consumable item. In which case I would recommend contacting Brother or a printer technician.

Sep 13, 2012 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

How do we connect Windows 7 HP to Brother MFC-7420?


you can 1. connect it directly to your computer and let your computer recognize it. or 2 use the install Cd and install it on your computer.

May 15, 2011 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Brought a new drum and the machine still says error


Check the instuctions that came with the drum. You will need to reset the drum count so it knows that a new drum was installed.

Apr 19, 2010 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

I didn't think that the MFC 7420 All-In-one was suppose to have a drum. I thought a new drum was included with new cartidge


Nope, Drum number is DR-350 and toner number is TN-350 they are different Drum is the one to connect with the toner.

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The drum is defective. The cleaning blade has failed.

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