Hmm...
Well, I tried Novastar's advice, and got no reaction. Even when closed the circuits directly at the jack. Which makes me think the problem is not in the motion/clash sensors, but in the motherboard itself, which in turn means there's no point trying to use the Hasbro sensors as a replacement. I don't see any broken connections or obvious short-circuits on the board. So I've got a setup with light, fire-up/fire-down sound, and idling hum, but no motion sounds and no clash sounds. Disappointing. I could scrap the MR board and use the old Hasbro board instead, but even hooked up to a decent speaker, the sound (particularly the motion sound) is pretty lame.
Well, they say you get what you pay for, which in this case is about sixty bucks.
Well, at least I learned something about motion and clash sensors. I'll post my best guess at a wiring diagram on the appropriate board.
I don't suppose weak batteries could be to blame?
I'll recharge them overnight and try again tomorrow.
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