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Reset to Default settings, if that does not work, shut down printer, unplug power from printer, shut down computer unplug power from computer, wait 20 seconds, plug power in to computer plug power in to printer, wait 5 seconds, boot computer, turn on printer.
NOTE: This should solve most problems with printers.
If still not working you have a faulty Toner unit.
This came from the Brother HelpDesk, yes they rang me and it worked. Cover open
"Replace Drum?" (ignore this and quickly...)
Press Start (blank screen, quickly...)
Press Up arrows then switch to down arrow to 00
This is not just a density sensor, this is a plastic cover over it that is getting stuck. There is a piece of soft rubber attached to the solenoid that is getting very sticky over time. Removing this rubber and stretching solenoid return spring corrects the issue. Search web for the service manual and follow chapter 8 to disassemble the printer correctly - takes less than 10 minutes to do it
Yup. I suspect the head has been removed from the unit. There are adjustments on some printers. It was assembled wrong. The grating noise is likely the auto cleaner. If it cannot go 'home' the unit will not initialize. Possibly the head detect sensor is broken or covered. If the head will not home (moves out and back more than once or slams home hard), 'Init Unable AF'. You may be able to order a service manual from Brother for this. A repair shop can order the manual as well. (I suspect you need a new print head as well. You might want to replace the printer) see tips on bubblejet printers.