MFC-640CW
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MFC-640CW
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Popular
Updated:30/03/2026
These are the most viewed FAQs, ranked by popularity.
- 1.The error message "Invalid format for short nick name" appears when printing a document. (Mac OS X 10.5 - 10.8)
- 2.My printed documents are incomplete or a blue screen appears when printing or using PC-FAX after a Windows 10 update (March 2021)
- 3.Protect your Brother machine against unauthorised access over the network
- 4.The message "[file name] can't be opened because it is from an unidentified developer." appears on OS X v10.8.x.
- 5.I'm using Windows. When I try to Scan to E-mail I get an error saying "the command line argument is not valid. Verify the switch you are using". What should I do?
Latest
These are the latest FAQs, sorted by last update date.
05/02/2026
I cannot find a file downloaded from the Brother support website (For Windows)
19/01/2026
I can print but cannot scan via network. (For Mac)
16/04/2025
I cannot print using my Brother machine on a wired network. (Windows/macOS)
16/04/2025
I cannot print from my computer via USB.
05/02/2025
Find the Wireless Security Information (e.g. SSID, Network key etc.) for Mac OS X 10.10.5 or greater