Question about Brother MFC-9420CN All-In-One Laser Printer

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MFC 9840cdw Can you help me with a MFC-9840cdw? If so, I need to figure out hwo to get rid of these 3 tiny black dots along the left side of the paper when I print and copy. I have taken out the drum and shook a little...what else can I do to get rid of the dots? Thanks!

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  • djoyf Jul 31, 2008

    I can't visually see any dots, is there something I can use to wipe it off?

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Look at the drum, that's going to be where you will find the dots on...

Posted on Jul 31, 2008

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Black marks like a grid on left side of paper


I am a technician for brother printers. Yes it is your drum unit that is printing the grid on the unit. go our web site www dot tonerconcepts dot com and place an order for a drum from us. The drum your machine uses is the DR520/620 Our online price is $120.00 with free shipping

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Did you check:
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2) does it appears when you print too? If yes, also check the fixing unit for spots, ... , but if there is also on drum, that means that the cleaning blade is deformed on some places ( the place where the toner streaks are ). You can use some paper A4, fold it on half and ran it beetwean the drum and cleaning blade.
But if the blade is too heavily worn out, the best solution would be to replace drum unit.

Hope that I helped even a little bit.

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MFC-9840CDW Laser Printer: I have a Brother MFC-9840CDW laser printer it is o...


Wipe the paper feed rollers with a clean rag wetted with plain water. You can also replace the feed rollers, search for "paper feeding kit" for this printer. Should be $20 to $30.

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Open the MP tray and place a new sheet of A4 paper on it.

Press and Hold the Clear/Back button and also press and hold the Left Arrow. The display should change to 'Drum Cleaning'

Press the OK button and it should clean the drum and print a sheet with smudges where your dots used to be.

You may need to repeat the procedure a few times.

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The drum probably needs to be cleaned. Refer to the Routine Maintenance section in Appendix C of your Users Guide.

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Does this printer have transfer and pickup rollers? If so many times these rollers go bad and can cause that problem. If it uses powdered toner, check for toner buildup near the ends of these rollers as well.

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Black dots on print outs from Brother Laser Printer MFC-9840CDW


meaning your printer drum is growing weak and will soon need to replace

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