Rewire the transformer plug for 120 V

Steps

• Unplug the game. In the lower cabinet, next to the big transformer, find the square Molex plug and pull its halves apart.
• Work on the half with the female pins (the half not wired directly to the transformer).
• The side of the plug with two notches carries the harness black and white wires at pins 1 and 7. The black wire at pin 1 never moves.
• Move the wires to the 120 V pattern. The wiring diagram reproduced on page 64 (from a Capcom manual) shows, for 115 V, the line wires on pins 1 and 7 with jumpers between pins 2 and 3 and between pins 8 and 9 (for 230 V: line on 1 and 7, one jumper 3 to 9). From a 206 to 230 V country, add a jumper made from 3 inches of 18 gauge wire with a female pin crimped on each end.
• Reconnect the plug.

Line voltage is present in the power box, line cord and transformer wiring; unplug the game before working there.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)