![]() The whenever the upper switch closes the computer would see both keys closed and calculate that the key was pressed very (infinitely) fast and generate a maximally loud note. They all share a "pull-up" resistor and a "de-bounce" capacitor.Ī failed capacitor, that shorted internally, for the D "lower switch" group could cause the keyboard controller to read those switches as always closed. ![]() I've found some schematics and some of the Yamaha keyboards do group the D keys (within the key switch matrices) together so that certain kinds of failures would affect all of the D keys.
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