This method is the most efficient way to find out the cause and fix the Brother printer is offline. In order to perform this procedure, it is first necessary to switch off your printer and remove all USBs and ropes that are attached to the printer. Remove the screws on the board on the printing device. By using a fabric wipe, dry the insides of the printer to remove any dirt that has accumulated on the printer. Once the cleaning has been completed then reconnect all the USBs as well as lines and then turn off the machine.