How to update a pringing server to a domain controller?

[userinfo]

Hi guys,

Cuz we are lack of resource, and would like to update an existing printing server to be the third domain controller. The problem is, we still want this machine to work as a printing server.

So, how to do it? I really have no idea.
Thank you very much!

 

[brontosaurus]

type of server won't matter. DCPROMO it and the print services will remain as is.