If the Target Bank Reset relay (Q) doesn't activate when you knock down all 15 targets,
Starting with the Sequence Completed switches (one on each of the target banks), 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