Brother MFC-7840N User Manual (English)

Other manuals for Brother MFC-7840N

Service Manual315 pages

Network User's Guide88 pages

Questions and Answers:

J
Julian DonovanAug 29, 2025
What to do if my Brother MFC-7840N All in One Printer has no printout?
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  William JohnsonAug 29, 2025
  If your Brother All in One Printer isn't printing, there are several things you can check: * Ensure the printer is plugged in and the power switch is turned on. * Verify that the toner cartridge and drum unit are installed correctly. * Check the interface cable connection. * Make sure the correct printer driver has been installed and chosen. * Check to see if the LCD is showing an error message. * Check the machine is online.
C
Carlos SmithSep 4, 2025
What to do if Brother Printer prints unexpectedly or prints garbage?
- A
  Aaron BowersSep 4, 2025
  If your Brother printer is printing unexpectedly or printing garbage: * Pull out the paper tray and wait until the machine stops printing. Then turn off the machine and disconnect from the power for several minutes. * Check the settings in your application to make sure it is set up to work with your machine.
W
William WrightAug 28, 2025
Why does my Brother Printer produce a vertical black line in copies?
- K
  katherine84Aug 28, 2025
  Black vertical lines on copies are typically caused by dirt or correction fluid on the glass strip, or the corona wire for printing is dirty.
N
navarrolaurieSep 5, 2025
Why does my Brother Printer not answer when called?
- S
  Shelly NashSep 5, 2025
  If your Brother printer does not answer when called, make sure the machine is in the correct receive mode for your setup, check for a dial tone, if possible, call your machine to hear it answer. If there is still no answer, check the telephone line cord connection. If you do not hear ringing when you call your machine, ask your telephone company to check the line.
M
mjacobsSep 5, 2025
What to do if dialling does not work on Brother Printer?
- T
  thomasanthonySep 5, 2025
  If dialling does not work on your Brother printer, check for a dial tone, change the Tone/Pulse setting, check all line cord connections, check that the machine is plugged in and switched on, and try sending a manual fax by pressing Hook or by lifting the handset of an external telephone and dialing the number. Wait to hear fax receiving tones before pressing Start.
K
Karen KochSep 7, 2025
Why isn't the network scanning, PC Fax Receive, or network printing working on my Brother Printer?
- Z
  zmedinaSep 7, 2025
  The firewall setting on your PC may be rejecting the necessary network connection. Follow the instructions below to configure Windows® Firewall.
V
Victor RobinsonSep 9, 2025
What does ‘RESULT:ERROR’ mean on Brother MFC-7840N All in One Printer Transmission Verification Report and how to fix it?
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  brandon43Sep 10, 2025
  A ‘RESULT:ERROR’ message on the Transmission Verification Report indicates a problem during fax transmission. This is probably due to temporary noise or static on the line, so try sending the fax again. Also, your machine may be out of memory, to free up extra memory, you can turn off fax storage. Try changing the Compatibility setting to Basic(for VoIP).
J
James JacobsAug 26, 2025
Why does my Brother Printer produce vertical black lines when sending faxes?
- R
  Robin GoodwinAug 26, 2025
  Black vertical lines on faxes you send are typically caused by dirt or correction fluid on the glass strip.
A
Alejandro WilsonAug 26, 2025
What to do if my computer cannot find my Brother Printer?
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  Nathaniel HallAug 26, 2025
  If your computer cannot find your Brother printer, the firewall setting on your PC may be rejecting the necessary network connection. For Macintosh users: Re-select your machine in the Device Selector application located in Macintosh HD/Library/Printers/Brother/Utilities/ DeviceSelector or from the Model pop-up menu of ControlCenter2.
C
Carol NormanAug 25, 2025
How to fix no printout on Brother Printer?
- D
  darlenecampbellAug 26, 2025
  If your Brother printer has no printout, check the following: * Ensure the machine is plugged in and the power switch is on. * Verify the toner cartridge and drum unit are installed correctly. * Check the interface cable connection on both the machine and your computer. * Confirm the correct printer driver is installed and chosen. * Check if the LCD shows an error message. * Make sure the machine is online.