Patent ID: 7757932

Claim:
A method for dispensing solder bumps on a mold plate, the method comprising: positioning a fill head comprising an o-ring over a first plate; relatively moving the fill head comprising the o-ring from the first plate to a second plate, which is a mold plate, by stepping down such that the o-ring decompresses as it crosses from the first plate to the second plate; positioning the fill head over the mold plate; dispensing solder from the fill head for filling at least one cavity in the mold plate with solder; and relatively moving the fill head from the second plate to a third plate by stepping down such that the o-ring decompresses as it crosses from the second plate to the third plate, wherein said third plate is a parking plate; wherein the relative movement of the fill head is unidirectional; wherein the stepping down comprises moving from a higher elevation to a lower elevation as the fill head relatively moves from one plate to another plate; and wherein the stepping down is enabled by adjusting a height of at least one plate such that the plate where the fill head is positioned is at a higher elevation than a next plate before relatively moving the fill head to the next plate.