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WPC power-driver board
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.
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.