OKI C301dn printing black only

[Raconteur]

I recently purchased the above printer and am only interested in printing in black. I note that whatever menu settings I use ("True Black, "Always create 100% black (K) toner", or "Grayscale"), the colour cartridges are always used up. Is there any way to disable colour usage altogether on this printer is anyone aware?

 

[service@PRT]

there no way in oki to disable color toner. even ur just printing black. it will combine to get to the nearest black color