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i have a ms pacman board. i bench tested it with ground and 5 volts to pin 17, works well. however, in the game i turned it on a wisp of smoke came off the board. the trace from Ic1 regulator to the zener burned up, the zener is shorted. after i replace the zener, i'd like to bench test it with 7 volts AC. it looks like the two 7 volts Ac leads could go to pins A and C? is that correct, and all it will need? thanks

Parts SideWire ColorSolder SideWire Color
7 Volt Center Tap (GND)Red-BlackA17 Volt Center Tap (GND)Red-Black
7 Volt Center Tap (GND)Red-BlackB27 Volt Center Tap (GND)Red-Black
7 Volt ACOrangeC37 Volt ACOrange
7 Volt ACGreenD47 Volt ACGreen
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