Question about Brother HL4040CN Laser Printer

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EL error open and close door again Brother HL4040

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Posted on Jan 02, 2017

  • 298 Answers

SOURCE: printing problem

Vertical line is probably scratch in Toner/image drum or one of the erase LED bar lamps is out. Start by replacing the Drum and see if it is better. LED erase lamp assy is more expensive so I hope for you that it is the drum.

Saw this scratched tomer drum on a ton of HP I serviced while in Europe


Posted on Mar 26, 2009

  • 19396 Answers

SOURCE: I replaced the drum on


EL, which wants to represent E6 is not a drum error code. EL (E6) means NVRAM error on main PCB.

If the error does not go away disconnecting power, then the main PCB (controller board) must be replaced.

Several forums cannot understand EL is E6 and point in the wrong direction. The full list of error codes is reported in service manual at pages 22-23. Service manual has been uploaded below:

A full service manual: mfc9840cdwservice man.



Posted on May 18, 2011

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1 Answer

Drum error message appears

open the front door remove drum unit you will 'Blue' liver on the top of the drum just move it in opp. direction and again move to same position, before closing the door press the options button on the key pad you will see replace the drum option press 1 and close the door.

Apr 06, 2011 | Brother MFC-7440N Laser Printer

1 Answer

Eroor 77 for fax brother 8070p

Open the front panel, remove the toner cartridge and close the panel. The printer tries
to warm up and then it will say to open the panel door. Open the door, insert the toner,
close it and the machine error will be cleared.

Jan 15, 2011 | Brother FAX-8070P Plain Paper Laser

1 Answer

What is "error 77"


Error 77 indicates a reset condition.

I'd suggest to open the front panel, remove the toner and close the front panel. The printer will try to warm up and then display to open the panel door. Open the door, insert the toner, close the panel and the machine error should clear.

Hope this helps.

Jan 29, 2010 | Brother Office Equipment & Supplies

1 Answer

Brother (photocopier, fax and scanner machine) says << back cover open. close back cover>> but the back cover (or at least what i think is the back cover) is closed. I even opened and closed it...

I have fixed this problem on my 7820n printer by brother.

open the back door, then inside there will be a black colored other kind of like door that pulls back away from the roller. on this inner door is a black long thin plastic lever that runs from about the center of the inner door to the right. on the right end of it is a lever that slides along a curved increase on the right side wall. when both doors are closed this right end of the rod or lever moves up to close the gap between what is the sensor. this long thin plastic rod had snapped out of place and when i snapped it back in making sure the spring was correctly installed on the left end of it and the middle part of the rod slid correctly in its groove...the right end of the lever correctly closed the gap on the sensor (when both doors are closed) and the back door open error went away.

So that's how you really fix it!!!!

James Hilliard - Totally super awesome guy! hee hee

Oct 27, 2009 | Brother MFC-7820N Printer

1 Answer

The Brother DCP 7020 printer displays error

back cover door switch is displace so it called back cover open.

Oct 12, 2009 | Brother DCP-7020 All-In-One Laser Printer

1 Answer

Back door wont close

First Isolate whether it is the Side Door or their is a door on the rear make sure that isn't open.
What I would do is Physically open and re-close all doors again the tabs and sensor get sticky after awhile. If not you could have a BAD sensor door switch.

Sep 14, 2009 | Brother MFC-7820N Printer

1 Answer

''Back door open, please close back door'' - back door is closed

This Error Is Reoccurring On All These Units Open Close Back Door Then Unplug For 30 Seconds And Then Plug It Back In. Check For Error.

The Brother Website Says To Check The Paper But Almost All Of These People Have Checked For Paper Problems And For Jams With No Result.

Jan 14, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Error message-Close the back cover

It appears that you have a broken back door have a look on the door to see if there is a broken piece of plastic as when you shut the rear door a tab pushes against a push switch letting the machine know that the door is closed. if you cannot see a broken piece then the switch it faulty try this by push a flat screw driver on the switch and check if the message disappears.

Thanks J

Jan 07, 2008 | Brother IntelliFax-2820 Laser Fax

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