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

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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

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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.

Posted on Jan 09, 2013

  • Christine Fernandes Nov 24, 2015

    i have done the above process several times and still doing it

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Posted on Jan 02, 2017

prashanthcl
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SOURCE: black line 1cm in from margin when printing

this is a catridge problem so pls replace your printer catridge.

Posted on Aug 22, 2009

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leroyal
  • 2120 Answers

SOURCE: 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.

Posted on Mar 10, 2009

  • 133 Answers

SOURCE: Brother MFC 7420: After changing the toner

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

  • 7 Answers

SOURCE: Wrong ink in slot

POWER PURGE!!

Hold down the menu key. While still holding the menu key, unplug the machine and plug it back in. Do not let go of the key until the machine reboots and the screen says "maintenence". Hit the following keys: 7, 6, 4,black start. The machine will then go into "power purge" or deep clean mode for about 5-7 minutes. When complete hit: 99 to get out of maintanence and reboot. Be sure to have extra ink cartidges on hand as it does use up a lot of ink but this process works the best every time when the printer wont print

Posted on May 11, 2011

  • 411 Answers

SOURCE: We have a Brother MFC 7420. Printing now give long

That's usually a bad cartridge, but can be from the wire not being cleaned by the slider, or a worn drum. If it's close to time for the drum to be replaced, I'd start there. The number of pages between drum changes is not a hard rule, but a generality. Drum wear depends on paper used, humidity, OEM or remanned cartridges, total page coverage, etc...

Posted on Jul 05, 2011

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Open te lid and look at the glass. You have dirt or white-out or something on the thin strip of glass to the left. Clean that glass!

Good luck!

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