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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7\$\begingroup\$ It looks like QC marks to me. Someone in the QA department saying "Yes, I looked at that well enough to stake my next performance review on the statistical likeliness of this particular part failing." \$\endgroup\$– GhedipunkJul 6, 2018 at 18:29
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1\$\begingroup\$ Seems more like a high voltage notifying or test point marks to me. \$\endgroup\$– rahulbJul 6, 2018 at 18:51
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1\$\begingroup\$ There is no way to know without asking the assembler \$\endgroup\$– Voltage Spike ♦Jul 6, 2018 at 19:23
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\$\begingroup\$ @Ghedipunk if you could make that an answer I will accept it. Thanks! \$\endgroup\$– Saaru LindestøkkeJul 6, 2018 at 19:26
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\$\begingroup\$ the two solder joints below the three red marks look like they may be bad (cracked) .... give them a closer look \$\endgroup\$– jsotolaJul 7, 2018 at 2:54
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1 Answer
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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.
