Hi Ron,

I had such prblems a few times. The problem originates when the newly made PCB's are packaged while still having some moisture on them, in plastic. You'd tear the plastic off and when you dispense solder and place the components, during the soldering process the component like 1206 & smaller gets shot off the PCB - not all, but some. Looks real cool but very inconvenient seeing these fleas jumping off the board like their little feet are burning...

Solution was to bake / heat (+/- 50 - 70 deg thumb suck) the PCB's for a couple of minutes and then use the normal process.

What happens is the solder paste being almost like toothpaste traps tiny bits of water under it. When the water turns to steam it explodes as the solder becomes almost solid with heat and with the flux evaporating, so when the water pops the solder the component takes off.