Question about Brother MFC 7840W Printer

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My brother mfc-7840w printer keeps telling saying there is a drum error and will not print. i clean the corona wire and reset everything yet the same thing happens again and again. how do i fix this?

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The drum is the photosensitive roller that the image is charged onto so I'm afraid cleaning the corona wire won't help. If the drum is removeable try reseating it, otherwise it looks like you may need to buy a new drum kit for it.

Posted on Apr 28, 2010

  • pete8888 Apr 23, 2011

    After you get a new drum unit, remember to follow the instruction to reset the machine to let it know a new drum is installed. In my MFC-7840W, I opened the front cover, I pressed the Clear/Back button while turning on the machine. Answered the question by pressing 1 if a new drum unit is
    installed. Then it works.

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Related Questions:

1 Answer

How to clean corona wire on brother 7840W


Corona wires are in the drum cartridge, small screen or grid over them. usually there is a colored slide that you can move back and forth to clean coronas.

Jul 23, 2014 | Brother MFC 7840W Printer

2 Answers

Where do you find corona wires on Brother 7840W printer?


The wire is on the drum (where the toner cartridge fits in). The green or blue piece slide cleans the coroner wire.

Jul 23, 2014 | Brother MFC 7840W Printer

1 Answer

Where is corona wire


Corona wire. Remove the toner cartridge with the drum. In the back of the drum you will se a green button on the right side. To clean it, slide it to the left and right several times and park on right hand side. Reinstall.

Jan 15, 2013 | Brother MFC 7840W Printer

1 Answer

My brother printer say Drum Error, so we replaced the drum. Same message. No incoming faxes are working and we have stored faxes we cannot receive.


Try cleaning the corona wire on the drum. It looks like a blue tab along the top of the drum. It may be necessary to reboot the printer also. You will likely lose those stored faxes but might be needed to reset the system.

Feb 28, 2011 | Brother MFC 7840W Printer

1 Answer

My Brother MFC 7840W prints but has a faint copy of the previous paragraph about 3 inches below. I have cleaned the corona wire very thoroughly but still the 'ghost' printing on my documents. How do I fix...


Yes. The drum is most likely your problem. It is possible that it is a one time problem, which can occur if you print a very dark black page or image followed by a light gray page or image. If it has only happened once or twice try printing a different document to check it. If it is happening repeatedly, then you should replace the drum and instantly see it fixed. You can get a drum anywhere that supplies toner.

I hope this helps! Good luck!

Feb 28, 2011 | Brother MFC 7840W Printer

1 Answer

I have this model printer (brother mfc-7840W) and i'm getting an error on the screen-it says Drum Error. See troubelshooting and maintenance chapter in the user manual


If you have the manual follow the steps for trouble shooting.
It will tell you to remove the drum, remove toner, clean corona wire and reinstall. If that does not solve the issue it will recomend replacing the drum. You can check your drum life by going to menu- press machine info, choose option 3 drum life and press ok. This will show you the remaining percentage of your drum if the number shows less than 25% replace the unit.
If it shows more than 50% you can reset the drum counter allowing the machine to read it as a new unit.( Bare in mind this will change the usage meter back to 100%, you will have to keep an eye out for print defects or light pages as this will signal the end of the drum life) to reset page counter remove the drum from the machine, with the front door open press Clear/back until the lcd displays reset drum yes? no? press 1 for yes and reinstall drum. The machine will cycle until ready; if this still has not cleared the message you will need to contact brother for a manual reset or service.

Jan 05, 2011 | Brother MFC 7840W Printer

1 Answer

Drum error message


To reset MFC-7840W drum count use the following steps.

1. open the front cover (leave open).
2. Press clear/back.
3. Then confirm the new drum install by pressing 1.
4. The display will indicate accepted.
5. Then close the front cover.

This should be done each time the drum unit is replaced.

Jun 18, 2010 | Brother MFC 7840W Printer

1 Answer

Drum Error on Brother MFC 7840W


Has two situations:
  1. The corona wire on the drum unit needs to be cleaned.Clean the corona wire on the drum unit.
  2. The drum unit has reached the end of its life. Replace the drum unit.

Feb 15, 2010 | Brother MFC 7840W Printer

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