F116 (unregulated +12 V) blows repeatedly.

Fuse F116 keeps blowing

Cause: Almost always a failed BR5 bridge rectifier.

Checks

• Test BR5 out of circuit.

Fix

• Replace BR5 and make sure the "+" side has good solder contact to the "+" lead of C30 (add the BR5-C30 jumpers).

Systems

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

Related tips

• Which fault blows which driver board fuse (WPC-89/WPC-S)
• Finding whether a blowing fuse is a board or wiring fault
• F111, F112 or the line fuse keeps blowing
• Switch matrix fuse F115 (F101 on WPC-95) blows as soon as it is replaced
• DMD dark and F116 keeps blowing: battlefield switches making the pusher run wild
• WPC-89/WPC-S driver board fuse ratings
• WPC: fuse holder snaps off the power driver board: replace the clips properly
• WPC power driver board fuses and what they feed

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