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If all the LED's are flashing and continue to flash for more than 10 minutes with the unit powered up, it needs to be serviced or replaced. (That is toner, drum, paper and the Ready light all blinking -> critical error found in self-test.) If the Ready light is off and the rest of the lights are steady, the toner is out, the corona wire needs cleaning and the paper tray either is empty or not picking up the paper.
Open front door where toner/drum goes in
Hold GO button down for about 5 seconds
All lights should come on then go out when GO button is released
Shut door and wait for warm up to end
Drum light should no longer be flashing
If still flashing then try procedure again
For the Price of these Brother Printers, it's cheaper to just buy a new Printer. I have a Drum Light and Toner Light on at the same time. Currently the copies still look great so I'm just going to let it go until this stops.
Turn it on and when all the LEDs light up, THEN press the Go button. One or more LEDs will stay lit and the others will be off. Look in the user manual (you can find it online at the Brothers site if you don't have one). There is a chart in the Troubleshooting section that will tell you what problem your particluar combination of "lit" buttons indicates. It may suggest fixes, or depending on the problem, tell you to see a repair person.