kb8tq@n1k.org said: > I’ve been doing SMT assembly for 40 years. I have never ever seen anybody > with a process that “just worked”. They all involve some amount of fine > tuning and design optimization. As an example... I remember supplying dead chips to the fab house so they could calibrate their setup without using real chips. The context was large ceramic BGAs. We were an early customer. Working chips were scarce. Everybody involved seemed to know about that trick. -- These are my opinions. I hate spam.