Parts on a special solenoid trigger switch

Each pop bumper and slingshot trigger switch has a 100 ohm 1/2 W resistor in series with a 22 MFD electrolytic capacitor (100 V; the positive lead to the resistor) wired across the switch. They stretch the pulse slightly so the device kicks harder. Matrix switches only have a 1N4004 diode. The coil itself still needs its 1N4004 diode.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Special solenoid trigger test at 2J12/2J13
• Weak pops or slings: check the trigger switch RC parts
• CPU-controlled and special solenoids
• What the solenoid test numbers mean
• Some devices do not move in the solenoid test
• No solenoid voltage
• Coil sleeve part numbers for System 3-7
• Testing a coil, switch or flipper diode with a meter

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)