Is there some kind of convention in electrical component maintenance that would explain a red marking on a capacitor?
I found this in my Pioneer SA 5300 audio amplifier and wondered if this carried some special meaning.
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Most likely Quality Assurance inspection.
For what purpose is anyone's guess (comments above are good guesses).... Here are some other ideas:
Such a large part as this could cause problems at or before the wave-soldering stage....an inspection to see that it is well-seated against the PCB after soldering.
A three-legged part with fat leads may miss a hole. An inspection to see that all three made it through their respective holes and bend over to make an acceptable mechanical seat.
An inspection to ensure that a polarized capacitor was inserted the right way, to save injury to the QA-person down the line who powers-it-up the first time.