Ok, found all the docs.
The HP 2610A is actually a rebadged or reskinned CDC 9322. Printing
mechanism is print hammers and drum.
I put up two pages out of the parts manual, one is a fairly poor but visible
picture of the unit. The other is a lineart drawing that shows the front,
back and major assemblies. That should give some idea of the item anyways.
http://www.ezwind.net/jwest/HP2610/
Jay