Toby,
If you touch up from the top, you may trap flux residues in a pocket which will cause an early failure to the circuit.


 Brien Bush


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Toby Carrier
Sent: Wednesday, July 30, 2014 12:06 PM
To: [log in to unmask]
Subject: [TN] PTH Component Soldering

Dear All,

Is there a IPC document that states a PTH component must be soldered from the bottom side? What if the component went through wave / selective solder and did not flow through the PTH properly to make the solder joint comply with IPC 610? Is it "illegal" to do a touch up from the top side, assuming both top and bottom sides are inspected? I know soldering from the top side is non-conventional, but I am curious what others think?

Thanks,

Toby
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