MFC-9840CDW
FAQs & Troubleshooting
What kind of memory can I use?
This machine has 128 MB of standard memory and one slot for optional memory expansion. You can expand the memory up to 640 MB by installing dual in-line memory modules (SO-DIMMs). When you add the optional memory, it increases the performance for both copier and printer operations.
In general, the SO-DIMM must have the following specifications:
Type: 144 pin and 64 bit output
CAS Lantency: 2
Clock Frequency: 100 MHz or more
Capacity: 64, 128, 256 or 512 MB
Height: 31.75 mm (1.25 inches)
DRAM Type: SDRAM 2 Bank
There might be some SO-DIMMs that will not work with the machine.
For more information, call Brother Customer Service.
This type of memory SO-DIMM is available from most major memory suppliers.
Capacity Buffalo part number
128 MB
VN133-D128/MF
256 MB
VN133-D256/MB
512 MB
VN133-D512/SCD
Capacity Buffalo part number
128 MB
12462-0001
256 MB
12485-0001
512 MB
12475-0001
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-9840CDW
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 Video FAQs
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 Direct Print Problem General Print Problem Print from Computer (Windows) Print from Mobile Device Print directly from Machine 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 Settings / Management Telephone Problem Telephone Operation Telephone Settings Advanced Networking Wired Network Setting Problem Wireless Network Setting Problem Wired Network Settings Wireless 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 Paper Handling Accessory Installation Installing Drivers / Software Updating Drivers / Software / Firmware Uninstalling Drivers / Software Driver / Software Settings Driver / Software tips Consumables Paper Accessories Cleaning Product Specification Paper Specification Windows Support Macintosh Support Tutorial Video
