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

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Four dots middle of page

Four dots print going down the middle of page either copy of printed..
toner seems fine, but should I change it to a new one anyway? there is nothing on the glass, etc.

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  • cmaponte Nov 25, 2008

    Same printer, same problem. Four dots making a column alligned around 1 inch from the left margin.

  • sloweddie Dec 11, 2008

    Same problem: 4 dots appear vertically down each printed page approx 3cm from right edge. I have inserted a new toner cart but this did not fix it.

  • solidtearz Mar 16, 2009

    ummm.. sorry, but i didnt understand the last post. so basically there is nothing i can do to get rid of the 4 dots that run vertically down the page ? except buy a new drum ?

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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. four dots middle of page - 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.

Posted on Feb 02, 2011

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Check fusing unit

Posted on Dec 28, 2013

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Take the drum cartridge out and look at the drum. lift the flap up and make a copy it will come out black. thew dots will show. if you measue from dot to dot that will be the circumfrence of the drum, either live with it ir replace the drum make sure that you are using brother oen drum and toner, generic toner will ruin the drum good luck brother sr tech

Posted on Jan 24, 2009

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The service repair manual.
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I don't think it is anything to do with the toner cartridge as this doesn't put the toner on the page seems to me that the drum unit is faulty either the cleaning blade has failed or the charge roller. Best thing to do is call a service engineer or copier company that deal with Richo or Rex Rotary.

Thanks J

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