The worst bugs make the instrument diverge from the schematic, often in ways that would look like nonsense if you drew it there.
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"From
over 40 years of fault finding and repair experience in a wide range of electronic products, not just instrumentation, the weirdest symptoms often have a really simple root cause!"
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This
has been my experience as well! Makes it very easy to go down a rabbit hole. Which is why I always do a thorough visual inspection first. Also checking mechanical components of switches, pots, etc. Giving them a good clean right off the bat and testing those
first can save you a lot of headache.
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-Frank
