The solenoid fuse blows when a game starts or when a pop bumper or slingshot fires.

Solenoid fuse blows when a pop bumper fires (1970s Williams/Bally)

Cause: From 1972 Williams and from 1976 Bally ran pop bumpers and slingshots on DC through a silicon bridge rectifier, which can short inside.

Checks

• Test the bridge rectifier with the meter's diode range.

Fix

• Replace the bridge with a 25 A or 35 A lug-style unit.

Systems

• Electro-mechanical

Related tips

• Bridge rectifier for 1970s Bally and Williams DC coils
• Solenoid fuse blows at start on 1972+ Williams or 1976+ Bally EM

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)