Bridge positions on WPC-S and earlier driver boards

Viewed left to right the bridges are BR3, BR4, then BR2 above BR1; BR1 and BR2 share a large heat sink. BR5 sits separately, slightly raised off the board.

Systems

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

Related tips

• Bridge rectifiers to use on WPC-S and earlier driver boards
• WPC power driver bridge rectifiers and +5 V regulator
• Driver board LED4 off and the game won't boot (WPC-S and earlier)
• Driver board LED5 off: flasher 20 V missing (WPC-S and earlier)
• WPC-89/WPC-S driver board LEDs and test points
• Voltages made by the WPC power driver board
• Supplies made on the WPC power driver board
• Adding backup jumpers to a WPC or WPC-S driver board

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