WPC transformers look alike but are not interchangeable

Every WPC transformer has the same output connectors, but they are wound differently: DCS games need a different transformer from non-DCS games because the sound board needs different voltages. Pre-WPC-S transformers sit near the coin box; from WPC-S they mount on the back wall of the cabinet.

Line voltage is present in the power box and at the transformer whenever the game is plugged in; unplug it before working there.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• 12 V supply reads nearly 16 V: transformer only half converted to 110 V
• GI dead but the driver board connectors look fine
• WPC-S and WPC-95 games to 120 V
• WPC-95 LED101 off (+5 V, game will not boot)
• Testing a WPC-95 rectifier diode
• WPC-89/WPC-S driver board LEDs and test points
• WPC-95 driver board LEDs and test points
• Early WPC games (Funhouse to Popeye) to 120 V

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part One, Clay Harrell (pinrepair.com)