Quoted from AtomicCafe:The game will not advance past 1st ball.
If the Add Player Unit (P) relay activates but the Add Player Unit itself doesnt, Inspect and diagnose this circuit with Alligator clip jumper wires
http://www.planetimming.com/Pinball/troubleshooting/EM%20Troubleshooting.pdf
http://www.pinrepair.com/em/index3.htm#features