Yes, I do have a manual. Came with the unit. thanks for the link. I'm sure it'll be useful to others.
I finished the scans. These are some negatives on loan which I had to send back so it was critical I do them right. I was able to set the machine to do linear scans and thanks to Mr Ingold's advice, was able to focus on each frame individually. Many thanks to all who responded especially to Mr Ingold!