The coin lockout coil is meant to be on
With the game on, the coin door lockout coil is energized all the time (so coins are accepted) and drops out when the game is off. It usually stays on in test mode as well. On some games set to free play it switches off. Its driver is transistor Q45 (bottom row, far right of the driver board) and it is coil 16 in the solenoid test, where it should cycle.
Systems
Related tips
- Coil outputs available on System 3-7
- Check the wire from the coil to its driver transistor
- Pop bumper or slingshot locked on
- A cracked coil diode keeps killing its driver transistor
- Coils 9-15 and coin lockout: connector, transistors, PIA pin
- Solenoid driver test at 2J9 and 2J11 with Leon's code
- Special solenoid trigger test at 2J12/2J13
- CPU-controlled and special solenoids
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)