Re: Circuit tracing - zener, or not zener?
Well, if you can power up the circuit you can measure what voltage is across it of what polarity, that will be a good clue. Also, just its polarity in the circuit is another clue. Is it shunting something?
A while ago I was breadboarding something and it just would not work and eventually I realised with some embarrassment that I'd put in a couple of zeners instead of 1n4148s.
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