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

2 Answers

Brother Printer MFC-7420

Hi there,
We have this printer which keeps saying "Drum Error, move the blue tab from side to side". What is that mean? And what I can do to fix this problem?
This is a printer at a business.
Thank you,
Yuli

Posted by on

  • NOLY739 Nov 13, 2008

    We have this printer which keeps saying "Drum Error, move the blue tab from side to side". What is that mean? And what I can do to fix this problem?
    This is a printer at a business.
    THANKS

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2 Answers

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Follow the instructions for sliding the blue tab and cleaning the drum contacts on the Brother website. When that doesn't work blow the paper dust out of the track that the blue tab slides in. The problem is that the main corona wire is dusty.

Posted on Jan 16, 2011

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Open the front cover and take out the toner/drum unit. On the top of the drum unit you will see a blut tab that you can slide side to side. Do this 10+ times and this should fix your issue. Make sure to put the blue tab back in the original start position which is believe is to the left on that model.

Posted on Jan 15, 2009

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SOURCE: Brother Laser Printer MFC-7420

Ok I fixed this problem. It has to do with Tension on the rod inside the back cover. Open the back cover and remove it. Then emove the black plastic piece by un hooking it on the left side and pull it down then toward you. You will see a rod attached to it that runs to the right. The right end of the rod has a lever that travels in a slot on the right side of the printer. There is a small spring on the rod. Here lies your problem. There has to be enough tension on this spring to activate a switch in the slot on the right side of the printer. Make sure the spring is installed properly. This is a low tension spring so nothing will come flying out when you remoe it and re install it properly. A piece of paper can dislodge this spring. When you get it apart you can quickly see how it should be put back in. E-mail me if you need further help landis1471@comcast.net

Posted on Jan 26, 2008

  • 133 Answers

SOURCE: Brother MFC 7420 keeps saying - back cover open -

First be sure you close the back cover and remove all the jammed paper. after that, turn off your printer for 1 min to see is it okie.

Posted on Jun 14, 2009

  • 24 Answers

SOURCE: my brother mfc-7840w printer keeps telling saying

The drum is the photosensitive roller that the image is charged onto so I'm afraid cleaning the corona wire won't help. If the drum is removeable try reseating it, otherwise it looks like you may need to buy a new drum kit for it.

Posted on Apr 28, 2010

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1 Answer

Brother MFC-7420; "Take Drum out; Slide blue tab..."


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

Jan 30, 2013 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

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

1 Answer

My drum is dusty. How do I get the dust off?I have an brother mfc 7420


Dust on drum is an issue with the corona wire. Use the blue tab on top of the drum unit. Slide it back and forth 10+ times and this should correct your issue.

Jul 23, 2010 | Brother MFC 7420 All-In-One Laser Printer

3 Answers

Replaced Drum still says "Replace Drum Soon". How do I reset on a Brother 7420?


Reinstall the new drum unit, keeping the front cover open. Press OPTIONS. Press 1 when the display shows REPLACE DRUM? 1.YES 2.NO ACCEPTED. Close the front cover.

May 28, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Refilled toner, installed reset gear and still get drum error after moving blue tab many times and back to right position brother all in one7420


if it said "change drum soon", actually you can ignore this message.
you can still print and printer still working with no much problem.
or you can reset the LCD.

May 10, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Mfc-7420 Black Line horizontal across paper in 3 places


try moving the small blue slider on top of the drum cartridge side to side 10 times.

Mar 10, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Error messages but I can't find the errors


ona brand new machine you get a starter cartridge, you will need to put in a new cartridge

Feb 01, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Printer is bi-polar!


Once you change the drum unit on these machines you must reset the printer. Turn on the machine, open the front cover where the toner is located, press the "option" button on the keyboard. You should see a message on the display that gives you an option to press 1 or 2. Press 1 to change drum. Close the cover and you should be reset.

Dec 27, 2008 | Brother MFC 7420 All-In-One Laser Printer

3 Answers

Toner/drum problems


This seems to happen some of the time. Brother has an FAQ for this:

1. Verify the toner cartridge is installed correctly by following the
steps listed below:

a. Open the front cover.

b. Lift the drum unit slightly and pull it out. Place the drum unit on
adrop cloth or large piece of disposable paper to avoid spilling and
scattering the toner.

c. Remove the toner cartridge from the drum by holding down the lock
lever (blue tab) on the left side of the drum unit and lift the toner
out.
*Handle the toner cartridge carefully. If toner scatters on your hands
or clothes, immediately wash it off with cold water.

d. Gently rock the toner cartridge from side to side five or six times
to distribute the toner evenly inside the cartridge.

e. Place the toner cartridge into the drum (be sure it clicks into
place).

f. Clean the primary corona wire inside the drum unit by gently sliding
the blue tab on the top of the cartridge from right to left several
times. Return the blue tab to the home position before reinstalling the
drum unit assembly.

g. Reseat the drum unit into the machine.

h. Close the front cover.

2. If the message "Toner Life End" continues to appear on the display,
contact Brother Customer Service at 1-877-Brother (276-8437) Monday
through Friday, 9:00am - 7:00pm EST, excluding holidays.

May 12, 2008 | Brother MFC 7420 All-In-One Laser Printer

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