Fuse F116 on the power driver board blows during multiball; the flippers stop, the lit flipper buttons go dark and a kicker fires repeatedly.

F116 blows in multiball after lit flipper buttons were added

Cause: Added accessories (here lit flipper buttons) draw extra current from the circuit F116 protects, so the stock fuse is marginal.

Checks

• First rule out a real short: check the accessory wiring and measure the unregulated 12 V at its test point.
• Unplug the accessory and see whether the stock fuse holds.

Fix

• If there is no short and the accessory is staying, fit a slow-blow fuse one step higher (the owner went from 3 A to 4 A).
• While the board is out, check C2 on the driver board for leakage.

Only raise a fuse rating after ruling out a short; an oversized fuse will not protect wiring from a real fault.

Systems

• WPC Dot Matrix

Games

• Creature from the Black Lagoon

Related tips

• Fuse F116 keeps blowing
• WPC power driver board fuses and what they feed
• Which fault blows which driver board fuse (WPC-89/WPC-S)
• Flipper buttons stop working but coils fire in test: Fliptronic board switch plugs
• Find what is blowing a fuse
• Test every fuse properly before first power-on
• WPC-89/WPC-S driver board fuse ratings
• Hologram lamp dead: its 12 V wire is loose at the flipper opto board

Source: Pinball Repair help group!! (Facebook group)