Gottlieb System 1: voltage conversion means new transformers

System 1 games cannot be rewired between 220 and 110 V; both cabinet transformers must be swapped. The small one gives 3, 5, 11.5, 14 and 69 V AC and the large one 6.3, 8 and 25 V AC. For 100/115/130 V: B-17921 (small) and C-17924 (large). For 220/240 V: B-17923 and C-17926. German 220/240 V: B-17922 and C-17925.

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

Systems

• Gottlieb System 1

Related tips

• The two System 1 transformers
• What is on the System 1 bottom panel
• How power reaches a System 1 game
• System 1 power supply outputs
• Acceptable System 1 supply readings
• The mandatory System 1 ground modifications
• Spare diodes, capacitors and other parts for System 1
• Quick checks on the similar System 1 power supply

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