Debugging Devices

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I suggest taking a very sharp knife and cutting the board traces at random until the thing either works, or smells funny! I gather you’re not asking the same question that led me to use the word changeineer in another column. I figure you have an actually malfunctioning piece of hardware and that you’ve already sent three previous versions back to the manufacturer, complete with nasty letters containing veiled references to legal action should they continue to send you broken products.