The MFC-9840 manual says that this code is reporting a mechanical error. Turn off the machine's power switch and then turn it on again. If the error message continues leave the machine for several minutes and then Click on this link or copy and paste the complete link into your browser. 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
Try to reset your machine in maintenance mode:
menu * 2 8 6 4 (within 2 seconds)
91 and then 99 to exit service mode.
User manual:
http://www.brother-usa.com/ModelDocuments/Consumer/Users%20Manual/UM_MFC_9840CDW_EN_2378.PDF
Brother's suggestion:
try to print, copy or scan again
Good luck.....
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309
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I tried entering maintenance mode but am unable to do so. Also I have tried Brothers suggestions as well.
I pulled power then pressed menu (and put power cord back in) , this got me into maintenance mode. When I then tried to copy I got Machine Error 21. Is this a part replacement?
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