Question about Brother MFC-9840CDW Laser Printer

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Getting a black line on paper when printer warms up...

Everything with this All-in-one works fine, except for now I am getting a black line on the right side of the printed page, only when the printer warms up. I can print off about 10-15 pages initially with no problem, but if I print more I start to get a black line (not solid) on the page. As I print more, the "line" gets thicker. After waiting for a while, I can print a small amount again (10-15 pages) without the black line, but again, when warmed up same thing happens. I have contacted Brother about this, and have cleaned all the parts that they say to clean. The problem is not "part related", and I cannot figure this out, unless I just print only a few pages at once! ANYONE??? Thank you~

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  • 331 Answers

Black lines on copy come from toner cartridge, or drum unit, or fuser unit which is in the back. check drum and see if you can see line, back of machine with flash light you may be able to see line on fuser roller. Be carefull Fuser is hot.
A copy that is good and then starts to get lines usually the drum unit...

Posted on Mar 28, 2017

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4 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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leroyal

Leroy Elliott

  • 2120 Answers

SOURCE: brother printer that prints a black line down center

probably a bad drum cleaning blade, It's part of the drum unit

Posted on Feb 03, 2009

Caleb Judd

  • 157 Answers

SOURCE: Brother printer prints solid black on one side

This is caused by a faulty drum/charging circuit or laser unit. The drum is positively charged with static electricity and a laser draws the image onto the drum (changing the charge to negative) the toner is positively charged to it will adhere to the negatively charged image which is now on the drum. your problem is that the drum is either not being positively charged or the laser is charging the whole drum. There is a corona wire on the drum, remove the drum, sweep the corona wire (there will be a tab that moves left and right) and try it again. next step is to replace the drum. if you dont have a spare drum or one from another printer then it may be more cost effective to buy another printer as drums are quite expensive and it may not even be the problem.

Posted on Jun 16, 2009

Alun Cox

  • 2679 Answers

SOURCE: Middle of print job - stops to CLEAN - then starts from pg1 AGAIN

This is a simple 3 step fix

a) Get rid of printer
b) Get rid of husband
c) Get new printer

Hope this works!! :-)

Posted on Jul 16, 2009

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Can only be two things the drum or the fuser as our headstrong friend has correctly explained.

More than likely it is the 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

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