Brother MFC-9840CDW Quick Setup Guide

To set up wireless printing, press the Menu button, navigate to Network, and select WLAN. Choose Setup Wizard and follow the on-screen instructions to connect the printer to your Wi-Fi network.
Ensure that the print settings are not set to 'Grayscale' or 'Mono'. Also, check that the color toner cartridges are installed correctly and not empty.
Open the front cover and remove the drum and toner assembly. Carefully pull out any jammed paper. Check inside the printer for any remaining bits of paper, and then reassemble.
Remove the drum unit from the printer. Use a soft cloth to gently clean the surface of the drum. Avoid touching the drum surface with your hands. Reinstall after cleaning.
Open the front cover, release the drum unit, and remove the used toner cartridge. Unpack the new cartridge, remove the protective cover, and insert it into the drum unit. Reinstall the drum unit into the printer.
Check the print settings to ensure they match the paper type. Clean the printer's corona wire and ensure that the toner cartridges are not empty or damaged.
Yes, you can scan documents to email by configuring the Scan to Email feature in the ControlCenter software or directly from the printer's control panel if it's connected to a network.
A 'Drum Error' typically indicates the drum unit needs attention. Try cleaning the corona wire, and if the error persists, consider replacing the drum unit.
Press the Menu button, go to Initial Setup, and select Reset. Choose the type of reset you want to perform (Network, All Settings, etc.) and confirm.
Visit the Brother support website, download the latest firmware update for the MFC-9840CDW, and follow the provided instructions to install it via your computer.