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

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Black smudge streaks on rightside of printed/copied material

Printed and copied pages are marred by ink smudges/streaks on the right edge. there are no artifacts on the rest of the page. the problem is heavy when printing large amounts of documents, and may disappear but always return.

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  • Anonymous Mar 25, 2014

    when I make a copy, the copied text is always in green

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  • Brother Master
  • 1,113 Answers

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.

Posted on Jan 11, 2008

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When I print, the pages are smudged with ink. What should I do?
Description:
- If smudged stains appear at the top center of the printed page:
  • Make sure the paper is not too thick or curled.
    Also, verify that the appropriate paper is being used and that the paper type set in the machine matches the media used.
  • Make sure the paper is not curled when you print on the back side of the paper with the Print Odd Pages and Print Even Pages settings.

- If smudged stains appear at the right or left corner of the printed page:
  • Make sure the paper is not curled when you print on the back side of the paper with the Print Odd Pages and Print Even Pages settings.

- If smudged stains appear on the reverse side or at the bottom of the page:
NOTE: Illustrations shown below are from the representative product and may differ from your Brother machine.
  • Make sure the printer platen is not dirty with ink.

    How to clean the machine's printer platen

    1. Unplug the machine from the AC power outlet.
    2. Lift the scanner cover until it locks securely in the open position.
    3. Clean the machine's printer platen(1) and the area around it, wiping off any scattered ink with a soft, dry, lint-free cloth.

      platen1.gif
    4. Close the scanner cover.

  • Make sure you are using Genuine Brother Innobella™ Ink.
    > Brother Genuine Supplies information


  • Make sure you are using the paper support flap.

    To use the paper support flap, pull out the paper support (1) until it clicks and unfold the paper support flap(2).

    flap1.gif

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Hello sir;The streak line from printing also should be from copy, because the line come from imaging unit, check the meter count if close to or over 50,000 then replace drum and drum blade, it will take care the problem.
The brother printer you need to replace imaging unit( drum unit).

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4 - black ink smudges (1/32" wide x 1/16" high) in right margin


Very nice trouble shooting. The image defect you describe point to the OPC or drum unit this is essentially the toner cart. In your case black. Measureing the distance between repetitive defects is a sure way of diagnosing problems such as yours. Again nice work.

Google repetitive defect ruler for your model to help in the future.

Hope this helps

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ok, What cartridges are you using, Are the Canon cartridges?
What paper are you using, is it Canon paper?

If you are to both of these it could be wise ordering a printhead, but this is mostly caused in the uk by None Canon Paper.

Please let me know what you are using?

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In either case the most likely cause is a buildup of fibers on the underside of the printheads or carriage, causing wisps of black ink to be dragged on the paper when the carriage reverses direction. You can clean the printer as shown at the following (though the details will be somewhat different for the Designjet or Deskjet....).

Regards,
Bob Headrick, MS MVP Printing/Imaging

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