Charlie. Find the solenoid the fires the plunger. Visually inspect both solder joints. Are the wires still connected?
If yes good.. Now take a DMM, set it to volts DC. Measure the voltage on both sides of the coil lug. Should be 50v on both lugs. The coin door interconnect may cut the solenoid voltagee.
If yes go to the driver board in the back box. Locate the associated transistor using the manual. Use an alligator clip jumper wire, short the transistor tab to ground. Does the solenoid fire?
If no, you have a wiring issue. If yes you have a logic board issue.