1)Having an intermittent matrix problem. I can turn the pin on, and it fine for a while with no play, but suddenly the outhole cycles continually. In the switch diagnostic it shows the entire row with the outhole closed, but that is false. The machine will play fine sometime for a while, but then it happens again. The board seems to test fine (only one switch triggering on each pin sequence), and the outhole switch is fine. I understand it could be a short, or a bad diode, but the intermittent part is throwing me off. I'll start to try to determine what is wrong, and without touching anything it will start working again. I didn't think a bad diode or short would cause an intermittent issue, especially when no play is happening. Ideas?
2) If a diode is bad on one of the leaf switches, what's the replacement diode? IN4001?
Thanks much!