Hello Richard,

A few things to look at:
- Did you perform a solderability test on the test coupons?
- How old are these boards?
- Did you verify plating thickness and voiding in the test coupons?
- are your components pre-tinned?

Alain Savard, B.Sc.
Chemical Process Analyst
CAE Electronics Ltd.
e-mail: [log in to unmask]

-----Original Message-----

I am finding no flow through on TPH holes after the boards are being put
through the flow solder machine. It looks like there are 4 to 5 holes per
board that have not wetted. This gives us between 3000 and 4000 ppm
faults on this problem alone.

Those are the symptomes, but what are their implications? Is it one
problem? What can I do to solve it?

Richard Tilbrook

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