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My brother MFC-8440 keeps printing black bars on the left side of m paper. It looks like a pattern which make me think it's on the drum or rotating wheel that the paper revolves around as it cycles it's way through the machine. I've tried cleaning everything as well as changed toner cartridges.

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Check if the charge corona cleaner is pushed all the way to the end. If not, it will leave a black bar on all images.

Posted on May 04, 2009

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This could be a issue in the memory of the printer.

try changeing the print quality down in the settings.

Posted on May 16, 2008

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Have you check the thermal roller.?

Posted on May 16, 2008

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You should first try to clean all of the rollers if you haven't done so already. You can use a clean cloth to do this and make sure to get the whole roller when cleaning.

Next is the print heads
Cleaning the four color print heads (black, cyan, magenta and yellow), adjusting the vertical alignment and/or replacing the ink cartridges may improve the print quality. To identify which print heads need to be cleaned and if the alignment needs to be set, print the Print Quality Test Sheet by following the steps listed below:


Checking the print quality:

  1. Press the Ink or Ink Management key on the control panel.
  2. Press the up or down navigation key to select Test Print and press OK.
  3. Press the up or down navigation key to select Print Quality and press OK.
  4. Press Color (Colour) Start. The MFC/DCP begins printing the Print Quality Test Sheet.
  5. By reviewing this Test Sheet, you can determine if the print quality needs improvement.
  6. Closely examine the print quality of the four color blocks that are formed by short diagonal lines on the Test Sheet.
    If all lines are clear and visible, press 1 (YES) and press Stop/Exit.
    If you can see missing short lines, press 2 (NO) and go to Step 7.
  7. The display will then ask you if the print quality is OK for black and three colors. Press 2 (NO) for black or three colors with the problem.
  8. The display will then show START CLEANING? 1.YES 2. NO.
    Press 1 (YES) and the MFC will start cleaning the color ink cartridges.
  9. After the cleaning is finished, press Color (Colour) Start. The MFC/DCP will print another Print Quality Test Sheet.
  10. If you can see missing short lines in any of the four color blocks press 2 (NO) and repeat the quality check and cleaning process. Repeat this procedure at least 5 times if print quality remains a problem. If short lines are still missing after the fifth cleaning and test print, replace the necessary ink cartridges. If the print quality of the 4 color blocks is OK, press 1 (YES).
Setting the Alignment:
  1. Press the Ink or Ink Management key on the control panel.
  2. Press the up or down navigation key to select Test Print and press OK.
  3. Press the up or down navigation key to select Alignment and press OK.
  4. Press Black (Mono) Start or Color (Colour) Start. The MFC/DCP begins printing the Alignment Check Sheet.
  5. By reviewing this Test Sheet, you can determine if the alignment needs adjustment.
  6. Examine the 600 DPI and 1200 DPI test prints on the Alignment Check Sheet. If the number 5 sample of both the 600 DPI and 1200 DPI most closely matches the 0 sample, press 1 (YES).
    If one of the other samples is a better match for the 0 sample, press 2 (NO). The display will then prompt you to select the sample that most closely matches the 0 sample for 600 DPI and then 1200 DPI.
  7. Press Stop/Exit.
Let me know if you are still having this problem, thanks

Posted on May 16, 2008

  • Benjamin Patri
    Benjamin Patri May 21, 2008

    Were you able to fix this, if so then please give me some feedback by
    rating my solution. If you need any more help, I would be glad to
    assist you, just ask.

    thanks and Have a Great Day!

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1 Answer

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