Hi
I have been struggling with boards for high quality picky customer. I am getting flux waves (like splashed - too hard to clean) after wave, where as we are still using Kester 979 (No clean flux, but as we are getting visible marks which looks similar like dross with flux. I have attached images for reference. In image that's definitely not solder. Its flux and please suggest how to avoid this issue. I have tried changing, flux supply level / pre-heat temps / variant conveyor speeds / solder pot heights. But no luck.
For IMAGES : http://www.keepandshare.com/doc12/show.php?i=2595013
Please help me to solve this.
Thanks
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