Oki C9600 C9800 42K OPC Image Unit Drum Reset Fuses - FANTASTIC WAY TO EXTEND THE LIFE OF THE OKI DRUM UNIT!  Ref: 4011DRUM
	The fuse is in the right hand end of the drum unit (the end where the toner catch is). If you look at that end you will see a small hole in the end cover approx 3mm X 3mm. looking through that hole you can see the pcb which holds the fuse. Remove the end cover and all should become clear.