WPC power-driver board

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The WPC power-driver board converts AC power from the transformer; drives the solenoids; drives the lamp matrix; drives the GI lamps; and detects flipper switch operation in non-Fliptronics machines.

WPC Power-Driver board with Flipper Relay

The power-driver board has the following functions:

AC rectification and smoothing for 70VDC solenoid voltage
AC rectification and smoothing for 20VDC flasher voltage
AC rectification and smoothing for 18VDC lamp matrix voltage
AC rectification and smoothing for unregulated 12V supply
AC rectification and smoothing for 5VDC flasher voltage
Regulated 12V supply
Regulated 5V supply
6.3VAC supply for GI circuits

Power control for high power solenoids
Power control for low power solenoids
Power control for flashers

Power control for lamp matrix
Power control for pre-Fliptronics filppers (not on all boards)
Sense optos for pre-Fliptoronics flippers (not on all boards)

Power control for 5 6.3VAC GI channels using four-sector triacs
Zero crossing sense for AC line in

Logic interface to WPC CPU

What Goes Wrong

Pretty much everything - each gets a longish section.