Hi,

I am having solder on gold trace of Hybrid circuit board.
We are assemblied SMT component on a multi-layer hybrid
board.

I do not know where the solder come from that solder on
the gold trace which is on the secondary side.

We use Kapton tape on the secondary / bottom side of the
board as to prevent the solder from in contact with the
gold trace.

But, it does not work well.

Can someone help to advise me what is the most probable
root causes for having such symptom.

Thanks.


Poh

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