Although I did do a lot of printing to a real ImageWriter, I worked out how to get my laptop to receive the serial data instead, and from there how to convert the raw ImageWriter commands to PDF. The results are
in this directory here. L2Video.pdf is the document itself, and all the other documents hold figures and tables that would have been pasted into it for printing. (Such is life before 7/7 I suppose!)
If you'd like access to the raw ImageWriter data and the conversion process that yielded the PDFs, then Level_II_Video_Board_4-22-83.tar.bz2 in the directory linked above is for you.
I think this should be a pretty helpful document for anyone trying to fix their video boards. The
components most likely to fail diagram is a pretty interesting one; I think I've seen CR7 replaced on a video board before! But the component that seemed to fail the most in the early 1980s (according to the document) was the 24V voltage regulator U1. I wonder what the most failed component is after 40 years...