Top 10 Brother MFC 7840W Printer Questions & Answers

The solution, and it took me a long time to find the simple solution, is to right click on your printer, click properties, click the ports tab and click on your Brother printer and click on configure port (or you can delete the existing one and then add another one). What you want to do is update the IP Address. The problem is that the printer does not have a static IP address, it is dynamic. If you want to confirm that, go to your printer and press the reports button and print out the network configuration report. Your IP address will show on that. It's really the last digit in the IP address that changes. This will absolutely solve your problem. Good Luck!

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.

Just put the scan job in the scanner and press the scan tab in your printer the scan image will appear in your directly connected machine/pc.

Menu * 2864 (within 2 sec.), 0,1, when 'maintenance' appears, press 0,9 to exit.

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.

open the front cover of the machine then press clear back it will say replace drum? press ok
the quality will probably start getting pretty bad as you will be using the drum passed it's life

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.

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.

If NONE of the other solutions worked for you, then you may have a Windows-specific network issue.
Try this: Print to your Brother printer when in Sleep mode. If Printer remains offline, SHUT DOWN the device. Wait a few seconds, then START Windows (not a Restart). If the printer prints your job from the "Welcome" screen, you have the same problem I have - this is a Windows-only problem.

I uninstalled/reinstalled the latest Brother printer driver for Windows 7. This had no effect.
Other observations:
1. All other Mac/Apple devices on my home network print to the Brother when in sleep mode, no problems.
2. My Verizon wireless router is turned off at night, and restarted in the morning. I though this caused a network issue with the printer, but the problem persisted when leaving the router powered on 24/7.
3. Ping test from the Verizon Router Admin account to the Brother printer is successful (remember Mac's work just fine).
4. Ping test from Windows 7 PC to the the Brother Printer is successful.
No Network connectivity issues were detected. Then out of frustration I shut down Windows and walked away. Upon starting windows from a full shutdown (not a restart), the Brother printer woke up and printed all my open print jobs!!

If I find a permanent solution I will post. The only change between working and not working was a Microsoft Windows 7 Update. I will try to update the Brother Firmware to see if this resolves.

Michael

1. lift lid and open front cover

2. press clear/back. "Replace Drum?" will appear on the screen.

3. Press "*00" it will then read accepted and the toner low error (End
of Toner Life) should go away.

4. close it all up and your done.