This thing is the bible for 60s, 70s, and 80s slot repair. It's also a piece of gaming history, I don't think another one exists. It covers Bally E/M slot machines, Bally E2000, Summit, CEI, Universal slot machines, Fortune one, Fortune two and others. Troubleshooting charts, Schematics, parts diagrams. Component theory. Monitor repair, wiper boards, contact stacks, you name it. It also contains repair info on early arcade games, Atari, Nintendo and more. There are at least 200 pages here and maybe 300. If you repair older slots or arcade games this is a must have. $100 plus shipping.