After downloading that Service Manual it quickly became obvious that the problem was a dead internal HD. I disconnected the HD and the printer now works great on my LAN from OS 9 machines, using the Apple Printer Utility for setup. However, the IP address is set to 0.0.0.0 so I haven't yet figured out how to set that so the printer is usable from OS X.
Anyway, progress, and thanks for the help.