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We have a Brother MFC-9840CDW with a fuser that's needing to be replaced. Brother says the fuser is part that "is not recommended to be done by the consumer." Are their hazards for changing the part myself anyway? Can you give me directions on changing the fuser?

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The fuser can be replaced by opening the back cover and removing 2 screws.

We have a Brother MFC-9840CDW - joed911_10.jpg

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response

Thanks, Joe

Posted on May 20, 2011

Testimonial: "Thank you!!"

  • 8 more comments 
  • JDTec
    JDTec May 20, 2011

    BTW... no hazards involved.

  • JDTec
    JDTec May 20, 2011

    Did this not help you? If you need further help, let me know.....

  • megan226 May 20, 2011

    i can't enlarge the pictures to see the diagram.

  • JDTec
    JDTec May 20, 2011

    send me your email, I will send the PDF

  • JDTec
    JDTec May 20, 2011

  • megan226 May 20, 2011

  • JDTec
    JDTec May 20, 2011

    you are welcome....Please re-visit the rating. Thanks

  • JDTec
    JDTec May 20, 2011

    Thank you... u r welcome...

  • sjkulit
    sjkulit Jan 31, 2012

    can you also send to the pdf. thanks.

  • Cheryl Spencer
    Cheryl Spencer Nov 19, 2013

    Can you please also send this to Thanks!



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1 Answer

Printed paper is dented at regular intervals as if embossed. There is toner in the dented areas. The dents are consistent in shape and location.

You will want to call a tech or contact Brother if under warranty to replace the fuser assembly. We had this problem in the duplexer built into the fuser assembly, we also had to replace the drum to get things back in order.

Aug 23, 2014 | Brother MFC-9840CDW Laser Printer

1 Answer


This usually works.

MFC- 9440, 9840cdw Print Unable 32

Usually caused by a sticking density sensor solenoid and can easily be repaired.

  • Remove the rear cover

  • Remove the fuser

  • Remove the Hi Voltage PCB

  • Check the angled density sensor window for sticking. When you move it, it should spring right back. If it hesitates at all, repair the solenoid.

  • Remove the old foam and replace it with adhesive labels.

  • Reassemble machine and test.

Apr 09, 2014 | Brother MFC-9840CDW Laser Printer

1 Answer

Laser printer makes light clicking noise when idle

When idle is potentially the fuser unit, after heating and cooling. However the print quality issue associated with the clicking sound could indicate an electrical issue. The HVPS maybe faulty causing the print quality issue (due to dependant parts) and the electrical click. In any case I would recommend calling Brother and finding the nearest authorised service agent.

Oct 20, 2012 | Brother Mfc-9840cdw All-in-one Laser...

1 Answer

MFC-9840CDW Laser Printer -

If you have had it for 3 years, yes maybe fuser, and the fuser is actually the cheapest part to replace, but I would pull all parts out first and clean everything. Then toner carts, make sure to cover and shake gently so toner is spread evenly. If you are refilling your own, they can only be refilled once.

Oct 20, 2012 | Brother MFC-9840CDW Laser Printer

3 Answers

Part number brother 9840cdw fuser

Part# LU4103001
About $150
The service manual will be hard if not impossible to find. They only release those to factory authorized service centers. If you just need it for the fuser replacement instructions then often those will be either in the operators manual which is easy to find or the instructions will be in the box that the fuser comes in.
Good Luck and Thank You for using Fixya.

Apr 01, 2010 | Brother MFC-9840CDW Laser Printer

1 Answer

Brother MFC 9840CDW

Sometimes just a static shock can do that, you need to replace the control panel pcb to fix it.

Dec 24, 2009 | Brother MFC-9840CDW Laser Printer

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