We had a spill in one of our machines which may have been caused by the toner not being loaded properly.
Once you have placed the toner in the drawer push the drawer all the way back before lowering the green handle (steps 8 and 9 on the door of the machine). Lowering the handle pierces the toner.
The technician advised doing this with the drawer at eye level rather than leaning down to it.
Nicola