The Brother MFC 9840CDW driver connects this color laser multifunction printer to your Windows PC, allowing applications to send print jobs with the correct settings. A compatible driver package gives you access to printer controls, while packages that include scanner software can also support document scanning.

Key Features

• Print settings for everyday documents: Adjust paper size, orientation, color or monochrome output, and print quality to suit reports, forms, and presentations.
• Duplex printing controls: Access automatic two-sided printing settings to reduce paper use when producing longer documents.
• USB and network setup: Configure the printer through a USB connection or use it over a wired or wireless network, depending on your setup and the selected software package.
• Scanning support where included: A full driver and software package may include scanner components for digitizing documents using the flatbed or automatic document feeder.

How to Install

1. Check your Windows version. Identify whether your PC runs Windows 11, 10, 8, or 7, and check its system type. Choose a Brother MFC 9840CDW driver explicitly listed as compatible with your operating system; software availability and included features can vary.
2. Prepare the printer. Turn it on and check that it has paper and no active error messages. For network installation, connect the printer and computer to the same local network. For USB setup, wait to attach the cable until the installer requests it.
3. Download the appropriate package. Select a printer driver for printing only, or a full software package if available and you also need scanning tools. Avoid assuming that a package intended for an older Windows release will work on a newer one.
4. Run the installer. Open the downloaded file, approve the Windows permission prompt if shown, and follow the instructions. Select USB or network connection as appropriate, then choose the detected printer.
5. Verify operation. Restart your computer if requested, then print a test page from Windows printer settings. If you installed scanner software, try a scan as well. If network discovery fails, confirm the printer’s connection and use its IP address if the installer offers that option.

Common Issues and Fixes

• Install fails or rolls back: Run the Brother full driver package as administrator, temporarily disable antivirus, and remove any previous MFC-9840CDW entries in Programs and Features/Printers before reinstalling. On Windows 10/11, use the latest Brother package rather than the basic inbox driver.
• Device not detected (USB/network): For USB, use a direct USB 2.0 port and a known-good cable—not a hub. For network, confirm the printer’s IP, ping it, and create a Standard TCP/IP port; allow Brother software through the firewall.
• Version conflicts or scan/print failures: Stop the spooler, delete old MFC-9840CDW printer and scanner (WIA/TWAIN) entries, restart, then reinstall matching print and scan drivers. Set the correct default printer and port.