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Brother MFC-7420 prints black pages

My MFC-7420, prints almost the entire page in black when copying. It has a new toner and drum

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  • Anonymous Feb 26, 2009

    same problem

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The drum is defective. The cleaning blade has failed.

Posted on Jan 31, 2009

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1 Answer

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

Cleaning blade did not work


error code c00f0401 of my hp officejet v40 printer

Jan 07, 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

I am getting a light duplication on my copies half


The duplication problem can be either the drum or the fuser. Most likely your drum needs to be replaced. If you can measure the distance between the first print and its duplicate I might be able to help more.

thanks adi

Dec 15, 2009 | Brother MFC-7420 Printer

1 Answer

When printing with my Brother MFC, the pages are dark.


Did you change the toner cartridge with a new genuine oem cartridge?
Do a report print <settings> page from the menu and check the 'Drum life' Bar graph. If close to, or at 0%, get a new Drum unit

Dec 09, 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

3 Answers

Four dots middle of page


How do I clean white or black spots on printed documents? Description: First make 10 to 15 copies of a blank, white sheet of paper.
If you still see the spots on printed documents after making multiple copies, clean the drum unit as follows:

  1. Remove the drum unit and toner cartridge assembly, and then remove the toner cartridge from the drum unit.
  2. Position the print sample in front of the drum unit so you will know the exact position on the drum that is causing the poor print.
  3. all-ug-19.gif
  4. Turn the black gear on the drum as you check the surface of the OPC drum.
    The OPC drum is photosensitive so do not touch it with your fingers.
  5. all-ug-20.gif
  6. When you find the substance on the drum surface that matches the print sample, gently dab the surface of the OPC drum with a cotton swab that is lightly dampened with isopropyl alcohol.
  7. Note
      • Do not use a scrubbing or wiping motion because this might damage the drum.
        all-ug-21.gif
      • Do not try to clean the surface of the OPC drum with a sharp object, such as a ball-point pen, because this might cause permanent damage to the drum unit.
  8. If the print quality still has not improved you need to install a new drum.

Sep 11, 2008 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Black smudge streaks on rightside of printed/copied material


Can only be two things the drum or the fuser. More than likely drum they last about 4 toners i think.

Learn the art of getting a page to stop halfway threw printing, you want to stop the page after the drum has put a image on the paper but before paper has gone threw the fuser (hotbit).

Once you have mastered the position correctly by stopping the printing by opening the door and removing drum/toner cartridge, to reveal the paper that is printed but can be rubbed off, we will know if marks are coming from the drum (you will see them) or from the fuser, if print is fine.

Dec 17, 2007 | Brother MFC 7420 All-In-One Laser Printer

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