MFC-7840N
FAQs & Troubleshooting
How do I adjust my Brother machine's Sleep Mode setting?
Setting the Sleep Time reduces power consumption by turning off the fuser inside the Brother machine when the machine is idle. You can choose how long the Brother machine is idle before it goes into Sleep Mode. The Sleep Mode timer is automatically reset when the Brother machine receives PC data or makes a copy. The factory setting is 05 minutes.
While the Brother machine is in Sleep Mode, you will see "Sleep" on the LCD. If you try to print or copy in Sleep Mode, there will be a short delay while the fuser warms up to working temperature.
For Wireless Models
If you cannot print or scan wirelessly, make sure both your Brother machine and your wireless router/access point use the latest firmware. If you cannot print or scan wirelessly, make sure both your Brother machine and your wireless router/access point use the latest firmware.
To adjust the Sleep Mode setting, follow these steps:
Press Menu and choose General Setup => Ecology => Sleep Time .
Do one of the following:
Use the keys on the dial pad enter the number of minutes the machine is idle before it enters Sleep Mode. You can enter 00 to 99 .
To turn Sleep Mode off, follow these steps:
Press the START and OPTIONS keys simultaneously.
Press the UP OR DOWN ARROW key to choose Off .
Go to STEP 3 .
Press the OK key.
Press the STOP/EXIT key.
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-7440N, MFC-7450, MFC-7840N, MFC-7840W
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
