How to reset the toner light on HL-2150N and similar machines:
Turn the printer off and open the front cover.
Leave it open while completing the following steps:
1. Hold the “GO” button while turning the printer on.
2. All panel lights should now be on. Release the “GO” button.
3. Press the “GO” button twice
4. Pause.
5. Press the “GO” button 5 times.
6. The toner light should be off. Now close the cover. The ready light should be the only light on.
How to reset the “end of life” messages on MFC machines:
1. Open front door where you access the toner.
2. Press the Clear/Back button.
3. Follow menu for resetting the different cartridges.
You may need to do this more than once.
Other printers that use the same consumables are: HL-2140, HL-2170W, MFC-7340, MFC-7440N, MFC-7840W, HL2140, HL2170W, MFC7340, MFC7440N, MFC7840W.