Choosing a replacement driver board filter capacitor

Use a 15,000 mfd 25 V snap-in capacitor on any WPC generation, including WPC-95; a higher voltage rating is fine. Do not go above 15,000 mfd because of inrush stress on the rectifiers, and do not go below 10,000 mfd (10,000 or 12,000 mfd are acceptable). Avoid a capacitor so tall that it hangs out sideways and strains its solder joints.

Systems

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

Related tips

• Driver board filter capacitors wear out
• Getaway: beacon runs nonstop in test and driver board C11 overheats
• Pre-WPC-95 resets: replace BR2, C5, C4 and the J101 pins together
• Filter capacitors and GI triacs that fit WPC boards
• WPC-95 filter capacitors are smaller (10,000 mfd)
• Driver board LED5 off (+20 V flashers)
• WPC-89/WPC-S driver board LEDs and test points
• WPC-95 driver board LEDs and test points

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