I have try everything that the manual says but is not working still offline.
Go to control panel and then to devices and printers.Locate your printer and right click,then select default or online ,depends on your OS.
SOURCE: "brother mfc 7840w printer goes offline and i cannot print need turn printer on and off.
The solution, and it took me a long time to find the simple solution, is to right click on your printer, click properties, click the ports tab and click on your Brother printer and click on configure port (or you can delete the existing one and then add another one). What you want to do is update the IP Address. The problem is that the printer does not have a static IP address, it is dynamic. If you want to confirm that, go to your printer and press the reports button and print out the network configuration report. Your IP address will show on that. It's really the last digit in the IP address that changes. This will absolutely solve your problem. Good Luck!
SOURCE: I have Brother Printer MFC-8890DW. It
If your printing from windows you might need to change the tray settings in the driver.
http://www.brother-usa.com/FAQs/Solution.aspx?FAQID=200000016347&Sympt=When+I+try+to+print+from+Microsoft+Word+or+another+program%2c+I+receive+a++message+stating%3a+No+Paper%2c+Reload+paper+in+MP+Tray+or+Insert+Paper+Manual+Feed.++What+can+I+do%3f&Model=1365&ProductGroup=5&Keyword=no%20paper&ProductID=MFC8890DW
SOURCE: Brother MFC-5440CN Printer Problem
If this only happens when you are copying.
1. Your scanner glass is dirty. Open the lid, use windex to clean the
flatbed. Look on the left side. You should see a strip of glass, with
the scanner sitting under it. This strip is used when the document feed
is being used. Make sure it is clean. Most common problem is getting a
little whiteout or the sticky residue from scotch tape on this glass,
which causes lines down your copies.
Clean it with alcohol which will dissolve the sticky stuff and the whiteout.
If this does not solve the problem, the CCD scanner in your machine might be going bad.
SOURCE: I can't print any documents
I had the same problem, and couldn't find a solution anywhere. My laptop said the wifi Brother MFC-255CW printer was offline, when the printer was definitely online and connected.
In the end I simply went into Control Panel / Printers, selected the Brother printer, and deleted it off the network. Then I chose "Add a Printer" from the network, and reselected the only printer on my home network - which was the Brother MFC-255CW that I had just deleted. The computer reinstalled the driver, and everything was fine again - haven't had a problem since.
SOURCE: my brother printer saying offline
Printer Spool offline: Disconnect the USB cable, go to RUN and type in services.msc and then find print spool and right click, then choose restart. And/Or: Start-->printers and faxes-->right click on the printer-->properties-->make sure it
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You tried to print via USB or network?
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