This WPC Power Fix Daughterboard from Kahr Circuits helps correct resets in WPC era pinball machines. It simply and easily plugs in to the MPU. If you get random resets, resets when you hit flippers, or if your game won't consistently boot, you may very well have a 5Volt issue that this will fix or help diagnose.

2018 Pro version has a button on it that allows the user to restart the monitoring sequence without rebooting the game. The Pro daughterboard from Kahr Circuits implements the same reset-preventing solution as the classic daughterboard but also includes additional circuitry to monitor your Power Driver Board. Green LED lit means both your 12v and 5v power supplies are stable. Red LED lit means at some point since turning your machine on the PDB 5v power supply dipped below the voltage that would have triggered a reset had the daughterboard not been present. Blue LED lit means the 12v supply is weak - at some point since turing your machine on the PDB 12v regulated supply dropped below 9 volts. Red and Blue LEDs lit means both supplies on your PDB have triggered alerts. It simply and easily plugs in to the MPU. If you get random resets, resets when you hit flippers, or if your game won't consistently boot, you may very well have a 5Volt issue that this will fix or help diagnose.

Replace the linear voltage regulator with an ezSBC's efficient switching regulator. This regulator is custom built with legs to fit directly into your board and it will operate without a heat sink. Basic soldering skills needed for removing the old 7805 regulator and for installation.

Replace the Remote Volume Control with a daughterboard attached directly to the sound board. For those Williams games with Type 1 Sound Boards (1 Fuse), here is a pin-compatible replacement for the original potentiometer (no longer available) that was soldered directly to the sound board. Components made today simply don't fit into the physical footprint of the original part. This is a small board that holds a potentiometer on one side and fits in the original footprint via header pins. Basic soldering skills are needed to remove the old potentiometer and install the new board.