A fuse blows and a game function stops working; bare wire shows at the back of a male connector pin.

Wire insulation shrunk back at a connector pin

Cause: The wire's insulation has shrunk back, letting the bare conductor touch the next pin or wire.

Checks

• Inspect the back of every male plug for bare wire, broken wires and cracked bakelite.

Fix

• Heat the pin tip with the iron, push the wire further into the pin and add solder.
• Glue cracked bakelite with super glue or replace the plug.

Systems

• Electro-mechanical

Related tips

• Wiring burnt after contact cleaner was sprayed

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