I got no response from Xerox, but found a video of Konica Minolta belt replacement. Exactly the same gear/belt routing. I replaced the belt (had to order it from Canada) and the MFD can now scan. I have some adjustments to do to it, then we'll be good to go.
I see no one has responded to this post yet. So, at this point I would recommend contacting your local Xerox Support Department to speak with a Product Specialist for more assistance. Please call 1-800-821-2797 or 1-800-835-6100
I have a WorkCentre 6400 whose scanner head belt has broken. I need a diagram that shows the routing of the replacement belt. I have the replacement: Xerox OEM 062E22490 (62E22490) Drive Belt