Bally -35 (Xenon and later) and 6803 transformer jumpers
The plug beside the transformer and line fuse in the cabinet takes jumpers between pins: 120 V uses 2-8, 4-6 and 7-11; 115 V uses 2-8, 3-6 and 7-10; 220 V uses 4-8 and 7-9; 240 V uses 4-8 and 7-11. Use the 120 V setting in North America; 115 V makes coils and lamps run harder. These plugs take male .093" pins.
Line voltage is present in the power box, line cord and transformer wiring; unplug the game before working there.
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Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)