20 Most Recent Brother MFC 7840W Printer Questions & Answers

Ignore the instructions that come with the printer, choose Open System, then choose WEP, enter, and it hooks up. Thanks to the above posters for this solution.

Brother MFC... | Answered on Nov 13, 2019


These types of lines are typically caused by dirt or tippex (correction fluid) on the scanner unit, or the corona wire is dirty. This problem is usually resolved by cleaning the scanner glass, scanner glass strip and white plastic bar with a soft lint-free cloth, or cleaning the corona wire.

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Brother MFC... | Answered on Nov 16, 2018

Brother has posted a Network Connection Repair Tool on their site under downloads. Worked great to put my MFC printer back on line with my network.

Brother MFC... | Answered on Sep 24, 2018

Reinstall the Printer on the laptop, using the WiFi connection choice when it comes up in the install wizard. The Driver will "Scan" the network and find the printer.

Brother MFC... | Answered on Jan 20, 2018

After I figured this out, it was quite easy to resolve. Remove the toner cartridge from the drum cartridge. Remove the black plastic cover on the left side of the toner cartridge (3 Phillips screws). There is a "flag", which is a small plastic tab on the outer side set to the right at about 2 o'clock. Turn the gears until you fully reset the tab going counterclockwise to the 10 o'clock position (fully to the left). Reinstall the small black cover and the three phillips screws. And the idea to install black electrical tape over the small clear plastic windows on both sides is also a good idea to prevent the early and false message that the cartridge is empty. Make sure you do not allow that tape to get into the gears.

Brother MFC... | Answered on Jan 02, 2018

since i finally figured this out I thought I would post this for anyone who has the
HL-4040 CN printer - or one similar
After seeing the hitting the buttons with the door open tricks for different models I tried anything that sounded like it had the same buttons my 4040 has... nothing on here worked so I just started hitting combinations of buttons with the door open - wow there are quite a few hidden menus there
For the toner life reset menu:
1 Open the front cover of the printer
2 press and hold the cancel button
3 press the reprint button while still holding cancel
- here is the reset menu - go to the appropriate cartridge on
- the menu and reset it and you're done!
FYI... Pressing the "Go" button and the up arrow gives you the parts life reset menu (drum, laser, fuser, etc.)
I also did the electric tape over the windows - which worked before the reset - but I thought this fact would be helpful too.
For anyone that is asking "what window?" I think it is the clear plastic opening on the sides of the cartridges where you can actually see the powder inside the cartridge - the color of the toner (magenta, yellow, or cyan). I didnt really know that for sure when I tried, but it made sense, and it worked. So I am fairly sure that is the "window" you should be trying to cover.
you can go here for more update: https://www.microtonersupplies.com.au/toner/brother-toner-catridges

Brother MFC... | Answered on Jul 20, 2017

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.

Brother MFC... | Answered on Jan 23, 2017

open the front cover of machine ( where the cartridge is installed), then press the clear button, and then press 1 for yes for change drum question.

Brother MFC... | Answered on Aug 24, 2016

please call on toll free 1-877 213 6551 for support.

Brother MFC... | Answered on Feb 18, 2016

A quick solution is to select a different type such as Arial or even Arial Rounded Bold.

Brother MFC... | Answered on Feb 05, 2016

You need an OCR program (optical character recognition)

Check out this site for programs and more detailed help:


Brother MFC... | Answered on Dec 05, 2015

As for how to save jpeg to pdf, you may need an image to pdf conversion solution. Check out these articles related:
Convert Image to PDF and append image to PDF in NET pqScan com
How to Convert Image to PDF

Brother MFC... | Answered on Oct 09, 2015

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