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Why mark the top of electrolytic capacitors

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nukie:
Hello all,

I have this question where it is more related to manufacturing. I have seen many switch mode power supplies with their top of electrolytic capacitors marked or scribble with a marker pen or some sort. Anyone know why is this done?

Google doesn't seems to understand my question.

Vincent.

Uncle Vernon:
It's the first signs of imminent PCB graffiti!

In most cases the marks will just signify build or test level. Just a production thing like the scribble in new car engine bays. Why the electros? Simply because they offer the most convenient surface for scribbling.

HLA-27b:
Occam's Razor at work....

ejeffrey:

--- Quote ---I have seen many switch mode power supplies with their top of electrolytic capacitors marked or scribble with a marker pen or some sort. Anyone know why is this done?
--- End quote ---

Because the people doing the assembling and test have poor handwriting?  ;D

ciccio:
We do that because, at the moment of visual inspection, we are more sure that the lady that is doing the inspection has checked for correct polarity.
A reversed electrolytic can do a lot of damage (even physical injury) at the moment of powering on for electrical test.
Most of the time the electrolytics are installed by hand, being trough-hole,  and not by the SMD machine, so an error may always occur.

Regards

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