The fuser has failed and needs to be replaced. If it is still under warranty Brother may cover it. If not you will have to take it to a Brother Authorized service center. It may be possible to find a used one on Ebay, even if its just for parts. Some of these smaller machines require extensive dissassembly to replace the fuser and shouldn't be attempted by a novice.
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On a Brother printer Error 50 typically means that the Fuser is malfunctioning.
Turn the printer off for about 5 minutes. Then turn the printer back on and wait for about 10 minutes. If after 10 minutes the printer doe not recover, you will need to replace the fuser unit. May be more economical to replace the whole printer.
Check the print document to see if the ink rub of easily,if so this mean the fuser cartridge need to be change.Turn off the printer and wait until it is cool before changing the fuser cartridge because the fuser get very hot when ever the printer is in use.
Open the fuser cartridge door. On most printers this door will be either on the left-hand side of the printer or in the back. Consult your owner's manual for the exact location. Flip down the clips that hold the cartridge in place, then grasp the handle and pull it out of the printer. Push the new fuser cartridge in until it snaps into place, then flip the clips up to lock it in place. Close the fuser cover door. Open the toner cartridge door and remove the toner cartridge. On most laser printers the toner cartridge is located either in the front of the printer or on the right-hand side. Vacuum underneath the toner cartridge to remove all paper dust and toner residue. This debris has a tendency to build up and cause streaks and stains on the paper. Wipe the interior of the printer with a soft cloth to remove any remaining debris that could cause problems with print quality. Continue cleaning the printer until all debris is removed. Purchase a set of laser printer cleaning sheets, and load one or two in the paper tray. Print to those sheets of paper to clean the paper path. These sheets are slightly sticky, and they are designed to remove dirt and debris from the paper path. You should also clean the print drum and the corona wires.
You need to make sure you set up for envelopes in printing preferences as this makes the fuser a little hotter. If all is set up properly you need a shop to adjust the fuser temperature. The thick envelopes require more heat to bond the toner properly.
when do you get this error, when scanning ,printing? are you on a network? have you tried to unplug the printer and plug it back in and have you rebooted your pc if thats what your using to print from?