I returned my C235 because it was too loud. It was replaced with another one - and it MAKES THE SAME LOUD NOISE. I guess that is how it is going to be. It is just a loud printer which is disgusting and annoying.
I searched the Support Page and found this article that says you will need to call support for more assistnce. 1-800-821-2797.
I just got a Xerox C235 Color Multifunction Printer. I set it up and started printing. It was really loud. I printed a few more documents just to see if the noise would get better but it doesn't. I wouldn't expect a new printer to be this loud.
Here's a video of it, the loud noise starts around the 23 second mark.