Williams System 3 to 6 games to 120 V

Steps

• The transformer plug is in the backbox and uses female .093" round Molex pins.
• For a 240 V to 120 V conversion, rewire the red plug to the 120 V pattern (on the example game a black jumper was added and the white striped jumper moved).
• Check the transformer has jumpers between lugs 2 and 3 and between lugs 6 and 7.

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

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A

Related tips

• Power circuits in a System 3-7 game
• Spare diodes, capacitors and resistors for System 3-7
• No +5 V on a System 3-6 power supply
• High-voltage supply rebuild parts, System 3 to 11C

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