Go to this link to learn about EM pinball machines.
http://web.archive.org/web/20090306055412/http://pinrepair.com/em/index.htm
Go to my you tube page to view videos of how to work on EM pinball machines in general.
https://www.youtube.com/channel/UC1KO137wpu6iiZVaMXjH_YQ/videos?view=0&sort=dd&shelf_id=1