Convert a Genco selenium rectifier to a silicon bridge

Steps

• Unplug the game.
• Mount a lug-style bridge rectifier (25 A 50 V or larger; a 35 A 200 V part works) to the wood panel with a screw through its centre hole.
• Move the two outer green wires that run from the top of the transformer to the selenium rectifier onto the bridge's two AC lugs (diagonally opposite, usually one marked AC).
• Put a 10 A fuse in one of those AC leads so a shorted bridge blows the fuse.
• Connect the single upper output wire of the selenium rectifier (the cloth wire to the harness) to the bridge negative lug.
• Connect the bridge + lug to the transformer's top centre lead, and cut that lead's link to the old rectifier.
• Leave the disconnected selenium plates in place for appearance.

Unplug the game first: EM cabinets carry 120 V line voltage to the transformer, and on some games to coils and the coin door.

Systems

• Electro-mechanical

Related tips

• Bridge rectifier for 1970s Bally and Williams DC coils

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