Colour Depth 48 bit colour processing (Input)
24 bit colour processing (Output)
Greyscale 16 bit colour processing (Input)
8 bit colour processing (Output)
Resolution
Up to 19200 × 19200 dpi (interpolated)
1
Up to 1200 × 2400 dpi (optical) (from Scanner Glass)
Up to 600 × 600 dpi (optical) (from ADF)
Scanning Width and Length
(Single-sided document)
(Scanner Glass)
Width: Up to 295 mm
Length: Up to 429.8 mm
(ADF)
Width: Up to 295 mm
Length: Up to 429.8 mm
Scanning Width and Length
(2-sided document)
(MFC-J3940DW)
Width: Up to 295 mm (ADF)
Length: Up to 429.8 mm (ADF)
1
Maximum 1200 × 1200 dpi scanning with the WIA driver in Windows 7 SP1, Windows 8.1 and Windows 10 (resolutions up to 19200 ×
19200 dpi can be selected using the scanner utility).
Printer Specifications
Resolution
Up to 1200 × 4800 dpi
Printing Width
1
291 mm
Borderless
2
: 297 mm
Borderless A4, Letter, A3, Ledger, A6, Photo (10 x 15 cm), Photo L (9 x 13 cm), Photo 2L (13
x 18 cm), Index card (13 x 20 cm)
Automatic 2-sided Paper Type Plain Paper, Recycled Paper
Paper Size A3, Ledger, B4 (JIS), Legal, Mexico Legal, India Legal, Folio, A4, A5, Letter,
Executive, B5 (JIS), B6 (JIS), 16K (195 x 270 mm)
Print Speed See your model's page on your local Brother website.
1
When printing on A3 size paper.
2
When the Borderless feature is set to On.
Interface Specifications
USB
1 2
Use a USB 2.0 interface cable that is no longer than 2 m.
LAN Use an Ethernet UTP cable category 5 or greater.
Wireless LAN IEEE 802.11a/b/g/n (Infrastructure)
IEEE 802.11a/g/n (Wi-Fi Direct)
NFC
(MFC-J3940DW)
Yes
1
Your machine has a USB 2.0 Hi-Speed interface. The machine can also be connected to a computer that has a USB 1.1 interface.
2
Third party USB ports are not supported.
Network Specifications
You can connect your machine to a network for Network Printing, Network Scanning, PC-Fax Send, and
PC-Fax Receive (Windows only).
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