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hellosailor, Even if there was a shorted diode,checking the alarm circuits individually (with all other diodes disconnected at the end opposit the piezo) the buzzer should sound for any good circuit(s). Also, you may want to check piezo theory before you check for a bad diode that is in series with one. It has been almost 40 years since I have actually had piezo theory, but I don't think you can read a resistance across one. Again, I may be mistaken, but I think it would read similar to a capicator or just an open circuit.
Duke
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