Data Products 2230 manual?

Hi folks, my Data Products 2230 drum printer recently stopped working. The trouble began a few years ago: Startup went wrong from time to time so that the printer control logic was stuck after power on. Repowering helped. But now it does not help anymore. I found the DP2230 service manual 2 on bitsavers. It contains the machine's schematics. That already helped me to trace the problem - a bit. It looks like the buffer/interface logic does mad stuff. At this point it gets quite difficult to understand the logic without any explanation. Does anyone have the service manual part ONE? I assume that this contains info about state machines, test points and procedures, explanations etc. A (probably pdf) copy of that manual would help me a lot. I would very much appreciate to get hold of it. Kind regards Philipp :-)