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

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Printer is bi-polar!

Keeps saying "change drum soon" even if we replace the drum, and keeps say drum error and is telling me to move blue tab side to side and i did. i switched the phone cord to a different hook up on the printer and it worked for a couple hours but now its messed up again. please help. im running a hotel and i need this printer to work so i can finish my paperwork.

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  • lisapappy Jan 07, 2009

    Keeps sayind Change Drum Soon and now saying dust on drum



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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.

Posted on Jan 02, 2009


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

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

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The printer says drum error,slide the blue tab from side to side,when I have done this the printer works but the repeats the error sign again.

Same problem-
1st- take out drum & toner assembley- with open door - press OPTIONS - then #1 - reinsert
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I have cleaned the drum but my printer won't work because it keeps saying Dust on Drum. do I ned to replace the drum?

You need to run that blue tab back and forth about 20 times to clean the drum corona, use canned air and blow out the area below the blue tab on the drum, wipe the metal contacts on each side of the drum, and if all that fails, you do need a new drum.

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Drum error

With that error you need to remove the drum, run the little blue tab on top back and forth about 20 times, blow out the area below the blue tab, and re install and try printing again. If the error is drum life end you need to open the front door and press either menu or options, sometimes the clear/back button and tell it it's a new drum.

Dec 30, 2009 | Brother MFC 7840W Printer

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When I turn it on I get a message to clean the wire on the drum. I clean it but I still get the same message. I just replaced the drum a month ago. I cannot use the printer because this message keeps...

You run the little blue tab back and forth about 20 times, use a can of air to blow toner out of that area, if it doesn't help, you need to wipe the corona wire carefully with a q-tip. Also wipe the electrical contacts on the sides of the drum and inside the printer on the right and left sides where the drum sits. After all that press go 3 times for a printout and see if it is telling you the drum clean error, it will show the last 10 errors.

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Having replaced cartridge now says drum error, remove drum and slide blue tab. How do you remove drum>

The drum is the piece that holds the toner cartridge. Once you remove it you'll see a pale blue tab at the rear of the drum unit. Slide it side to side a couple of times to clean debris from the drum area.

Dec 08, 2009 | Brother DCP 7010 Multifunction Laser...

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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

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

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Brother Printer MFC-7420

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.

Sep 06, 2008 | Brother MFC 7420 All-In-One Laser Printer

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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
*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

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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