Lexmark Optra SC1276

I bought the above Colour laser printer which was a demo model in the shop and the consumables were missing. I have noticed that four cartridges are advertised; black, cyan, magenta and yellow and also a photoconductor unit.

Does the photoconductur unit contain the four cartridges or is this an additional unit that is required along with the four cartridges. Is there any other consumables necessary?

Thanks