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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  • 148 Answers

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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Drum cleaning function doesn't remove toner spots

Did you check:
1) are there wisible marks on drum - like spots, streaks,... if no, first check the copie glass if it appears when you make copies.
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.

Jun 14, 2010 | Brother MFC-9840CDW Laser Printer

1 Answer

Mfc9840 has yellow spotty smudges down left hand side of paper when printed

Firstly you need to remove all toners, and drum, then vacume all interior.
Check the transfer belt, drum for any dirt or residues of yellow toner.
If cleaning doesnot help, change the dirty part.

Jun 08, 2010 | Brother MFC-9840CDW Laser Printer

2 Answers

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.

May 18, 2010 | Brother MFC-9840CDW Laser Printer

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3 dots along the left margin of paper, after replacing the drum

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.

Apr 24, 2010 | Brother MFC-9440CN Laser Printer

1 Answer

When I print I have black dots on it and a red

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

Oct 08, 2009 | Brother MFC-9840CDW Laser Printer

1 Answer

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

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

Apr 10, 2009 | Brother MFC-9440CN Laser Printer

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