Resetting a Brother HL-2240D toner error

You'd think that the only thing I do around here is save instructions on how to reset printers.

Here's how you reset a Brother HL-2240D, with TN-420 or TN-450 toner cartridges.

1. Turn the printer off.
2. Open the front toner/drum cover.
3. Press and hold the Go button while turning on the printer.
4. Release the Go button after the Toner, Drum, and Error LEDs turn on, with the Ready LED off.
• At this point, all LED lights should be off. 
5. Press the Go button 2 times. 
• The Toner, Drum, and Error LEDs will turn on.
6. Press the Go button:
• 6 times for TN-420 cartridges.
• 7 times for TN-450 cartridges.
• At this point, the Error LED will start to flash.
7. Close the front cover.
8. Restart the printer.

These instructions were first found on 123inkcartridges, on Wednesday, September 13, 2017. I copied them here so I had access to them in case it ever left the web.