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

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Brother MFC 7420: After changing the toner cartridge, started getting black irregular-shaped spots, 1.5" from left edge of paper and 1.5" apart in a vertical row on every printed page. Changing the drum didn't help. Printer is about 1 year old.

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Just need to clean up all glasses with alcohol and move the blue panel to clean the drum, after that sould be fine.

Posted on May 22, 2009

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My Brother MFC-7420 Printer always prints black lines and splotches down the left side of my paper. This happens whether I'm scanning or printing from my PC. When I looked at my drum, it appears a


If you are seeing vertical streaks/black lines your primary corona wire is dirty and or the fax scanner may be dirty.
1)To clean the corona wire you take the drum unit and toner cartridge and place it on disposable paper to avoid spilling.
2) Clean the primary corona wire inside the drum unit by sliding the blue tab from right to left several times.
3) Return the blue tab and snap it into the home position.
4) Reinstall the drum unit and toner cartridge.
5) Close the front cover.
Caution: if you do not return the blue tab to the home position it may repeat the black lines.

Nov 29, 2012 | Brother MFC 7420 All-In-One Laser Printer

2 Answers

Brother 9970cdw toner


The Brother printers have a counter which will shut the printer down when the preset number of copies has been reached. You can reset the counter and it should print again. I did this 4 months ago. It bought me a little time, but my printer has begun to print a solid line down the left side of each page. I have cleaned everything that I can access to rule out smudged glass, etc. Perhaps it is just best to replace the drum or buy a new printer(much to Brother's delight and design).

Jul 10, 2012 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

My Brother MFC-7420 still shows "Toner Low" as always and I cannot use the scan tool. Please help me as quickly as you can. Thanks


1) Pull out the cartridge and look on the right side of the it. You will see a small hole that has a glass like window in side (round window).

2) Turn off MFC-7420

3) Cover the hole on cartridge with a duct or a piece of paper. Basically block.

4) Replace the cartride back in the printer and turn on the printer.

5) The message should be gone and you should be able to use the copier functionality.

It worked perfectly.

What an unethical practice Brother is following? They want us to spend more money buying their cartridge unnecessarily.....

Apr 19, 2011 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

I have changed cartridge and drum in the printer


If the cartridge has irregularities on it you will get poor results. The large black roller should be smooth all the way around. Any bumps will cause lines and spots. It is not recommended but I have had luck cleaning that large black roller. Once smooth the lines went away.

May 18, 2010 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Brother MFC-7420 just started printing a shadow image


Sounds like a bad drum cartridge. Pull the toner/drum cartridge out of the machine and set it down. Press down on a (blue?) tab to release the toner cartridge, and you can lift the toner cartridge out of the drum cartridge. There is a cleaning blade in there - a soft plastic blade that rides against the drum and scrapes off toner that didn't get transferred to the paper. If it gets stuck off the drum surface, images repeat a few inches (one drum circumference) down the page.

A new DR-350 drum unit should fix it. have the machine's power on when replacing it. While the door is open, touch the CLEAR key. The display will read "REPLACE DRUM?" or something like that. Press 1 for Yes.

Jan 05, 2010 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Brother MFC 7420 screen displays "Back Door Open" have cleaned etc. Can you help ?


Remove the drum and toner (cartridge), look inside the machine, there should be a piece of paper, remove it and error msg should go away.

Nov 08, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

It says toner life end and it prints just fine


The toner life end message means the toner is getting low. It will continue to print without any problem. Eventually you will see the print starting to get light in spots. If it is a new cartridge, the toner level sensors are probably dirty.

Oct 08, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Everything is printing black n dirty


Most likely cause is a bad toner cartridge. It's likely dumping excessive toner inside the printer. try taking the toner out and hold it sideways and tap it, if toner falls out then your cartridge is defective. try vacuuming the printer and wipe it clean with a dry cloth and and replace the toner with a new one.

Oct 05, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Paper jams 1/2 way through drum/cartridge. Jams like an accordian, with 1/2 page printed. My printer is a Brother mfc 7420. About 2 years old.


Take the toner cartrige out, look around with a flashlight for a piece of paper or something that could jam the works. Check the movable tab that comes out of the front of the machine to hold paper up, maybe it has gotten crooked or something. Don't have anything in front of the machine to block the paper coming out. A can of compressed air can be used to blow the machine out.

Apr 12, 2009 | Brother MFC 7420 All-In-One Laser Printer

5 Answers

Refill toner Brother MFC 7420


open front cover, press OPTION button, on the LCD will appear a message "NEW DRUM?" ....DO NOT RESPOND....just type on the keyboard "*00" and there will appear a message "Accepted" and use it in your pleasure.

PS. in any case i blocked with paper labels the viewing windows from transparent plastic on the toner itself....

Mr. Brother, do not try to be smarter than your customer

May 22, 2008 | Brother MFC 7420 All-In-One Laser Printer

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