Please help!
Please help!
(OP)
My friend just brought up me this topic about Capacitors. He has some problem with polarized CAP at his work place. These CAPs were installed backward on the PCB. However, the In-Circuit-Test did not detect this problem. When it come to functional test, the CAP blows up.
Please help! if anyone know how to build the circuit to detect this problem before it blows up. I appreciated it.
Please help! if anyone know how to build the circuit to detect this problem before it blows up. I appreciated it.





RE: Please help!
http://www.ifrsys.com/solutions/ate/4200/4200_home.htm
It is the only solution I am aware of. Anyone else know of others??
RE: Please help!
That's a great resources. However, What I want a small circuit that can test the polarized CAPACITOR when the board already power on at short period of time. What I mean is that circuit is going to detect any reversed CAP on the board, before it pop up. The ATE testers are fine. However, I assume that in the worst case scenarios, if there is no testers around, then we can use that small circuit.
Please advise!
Thanks in advance! Luan
RE: Please help!
I guess the method to make this determination would depend on the mfg process. If your doing real low volumes with low component counts then maybe a visible inspection is possible. Could you explain more about what your in circuit test consist of?
RE: Please help!
If this problem is after a picknplace assembly....
Get someone competent to load the parts profile.
Check your machines vision ID part profile for the problem part(s).
RE: Please help!
Regards..Luan
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Good luck and keep us posted!
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Good luck, and if you figure out a method please post the solution! (This is a VERY common problem)
RE: Please help!
Melone: Is the leakage current higher or lower for say an aluminum electrolytic that is inserted the wrong way? Or is it nonexistent?
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Hope this helps
RE: Please help!