MFC-7840N
FAQs & Troubleshooting
How do I make my faxed documents lighter or darker? (Fax Contrast)
For most documents, the Brother machine's default Fax Contrast setting of Auto will produce the best results. This setting automatically chooses the suitable contrast for your document.
If you want to fax a very light or very dark document, changing the contrast may improve the fax quality.
Please follow the steps below to change your Brother machine's Fax Contrast setting.
*If your Brother machine has a touchscreen, please follow the steps under "For touchscreen models" below.
Press FAX to illuminate it.
Do one of the following:
Place the document you want to copy into the Automatic Document Feeder (ADF) face up, top edge first.
Place the document you want to copy face down on the flat scanner glass.
Press Menu and select Fax => Setup Send => Contrast .
Press the Up or Down arrow key to select Auto , Light , or Dark .
Use Dark to make the faxed document lighter .
Use Light to make the faxed document darker .
Even if you choose Light or Dark , the Brother machine will send the fax using the Auto setting if you set Fax Resolution to Photo .
Press OK .
<For touchscreen models>
Press Fax .
Press the Left or Right arrow key to display Contrast . Press Contrast .
Press Auto , Light or Dark .
Use Dark to make the faxed document lighter.
Use Light to make the faxed document darker.
Even if you choose Light or Dark , the machine will send the fax using the Auto setting if you choose Photo as the Fax Resolution.
If your question was not answered, have you checked other FAQs?
Have you checked the manuals?
If you need further assistance, please contact Brother customer service:
Related Models MFC-7340, MFC-7360, MFC-7450, MFC-7470D, MFC-7840N, MFC-7860DW, MFC-8510DN, MFC-8910DW
Content Feedback
To help us improve our support, please provide your feedback below.
Error Messages Paper Feed / Paper Jam Print Scan Copy Telephone Fax Mobile Others Advanced Functions (for Administrators) Linux Product Setup Driver / Software Network Settings Consumables / Paper / Accessories Cleaning Specification OS Support Information
Printer Scanner / Scan Key Tool PC-FAX / Fax-modem
Security Enhancement
Error Message on Machine's Display Error Message on Status Monitor Error Message on Computer Error Message on Mobile Device
Paper Jam Paper Feed Problem
Cannot Print (via Network) Cannot Print (via USB / Parallel) Cannot Print (via Mobile Device) Print Quality Problem General Print Problem Print from Mobile Device Print Settings / Management Tips for Printing
Cannot Scan (via Network) Cannot Scan (via USB / Parallel) Cannot Scan (via Mobile Device) Scan Quality Problem General Scan Problem Scan from Machine Scan from Mobile Device Scan from Computer (Windows) Scan from Computer (Macintosh) Scan Settings / Management Tips for Scanning
Cannot Copy Copy Quality Problem Copy Operation Copy Settings / Management
Telephone Problem Telephone Operation Telephone Settings
Advanced Networking Wired Network Setting Problem Wired Network Settings Tips for Network Settings
Cannot Send a Fax Cannot Receive a Fax Fax Quality Problem General Fax Problem Fax Sending Operation Fax Receiving Operation Fax Sending Operation from Computer (PC-Fax) Fax Receiving Operation with Computer (PC-Fax) Fax Settings / Management Tips for Fax
iOS Device-related Problem Brother iPrint&Scan / Mobile Connect (iOS) AirPrint (iOS) Android™ Device-related Problem Brother iPrint&Scan / Mobile Connect (Android™) Brother Image Viewer (Android™ Device) Windows Phone Device-related Problem Brother iPrint&Scan (Windows Phone Device)
Machine problem
Machine Setup / Settings
Installing Drivers / Software Updating Drivers / Software / Firmware Uninstalling Drivers / Software Driver / Software Settings Driver / Software tips
Consumables Paper
Cleaning
Product Specification Paper Specification
Windows Support Macintosh Support