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First of all, I checked the answers given here, but nothing worked; everytime I turned on the unit, the red light flashed that the printer was out of paper.
From the Brother's HL-2070 manual, in the troubleshooting section: take out the toner cartridge from the front of the machine (be careful, any black toner powder that come off may be very difficult to clean up). I took the toner cartridge to the sink.
There is a blue slide along the top of the unit that will clean the corona wire if you slide it back and forth, from one end to the other (toner/dust can become caked on the wire over time; sliding the slider back and forth simply knocks the caked off 'stuff' off of the wire).
Replace the toner cartridge; it worked fine for me. I was immediately able to print.
You need to replace the drum and reset the printer for that to go away, open the front door and hold the go button til all lights flash and the drum is reset. If quality is OK you can keep using the old drum. If you press the go button 3 times it will give a report showing the life left in the drum.
When all lights flash it's a service problem. You press and hold the go button and see what lights are on then.error light means main PCB failure, Toner light means fuser failure, drum light means laser failure. Toner and error light means main motor error, drum plus error light means its a fan failure.
The HL-2070N gets stuck in a toner end-of-life error condition. Perform the following to clear :
With paper loaded, new toner in,
Open front door
Turn off printer
While holding down the GO button, turn printer back on
When all four LEDs light up release GO button. All LEDs will turn off
Press the GO button 2 times. The 3 LEDs (toner, drum, paper) will light up solid
Press the GO button 5 times
Paper light will be blinking
At this point the toner end-of-life condition has been reset. Close front door.
BTW, I got this from Brother Support. Also, just a reminder, timing is important here so don't pause between button presses.