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Quoted from RDReynolds:What's interesting is that the light on the flipper board does flash when I hit the left flipper switch
Yes, very interesting. I can watch that for hours.
The logic on flipperboard splits into a drive for the switch-matrix and a drive for the coil with High+Low power.
If for example the transistor for switch-matrix is shorted, the flipper and LED do still work.
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