Make sure you note which toner i.e. black (k), cyan (c), magenta (m), or yellow (y) and check that you have one ready to put in, you don’t need a whole set only the one which is showing as almost empty. Your machine will continue to run but If you don’t have one in stock call our customer care centre on 01482 657007 option 2 for a replacement and we will despatch one out to you at the next available delivery. Please don’t replace it until ‘toner empty’ shows on the display. It would also be advisable to check if anyone else in your company has already ordered a replacement.