Patent ID: 6974069

Claim:
A method for attaching solder balls of a ball grid array package, the method comprising: a solder ball seating step of unloading base frames attaching base tapes on which solder ball pads are provided, coating the solder ball pads with flux, transferring identified solder balls on positions of the corresponding solder ball pads respectively, transferring the base frame after confirming the position of the solder balls on the solder ball pads, and transferring an empty container, from which all base frames are unloaded, in a designated position; a solder ball reflow step of melting and cooling the solder balls seated on the solder ball pads and transferring the base frames after receiving the base frames from the solder ball seating step; a cleaning step of removing the flux covered on the solder ball pads and transferring the base frames after receiving the base frames from the solder ball reflow step; and a base frame storing step of determining quality of the base frames received from the cleaning step, sorting the base frames according to the quality and storing the base frames in the empty container transferred to the designated position; wherein the base frames, which finished the solder ball seating step, are transferred in the first direction, the empty container is transferred to the designated position along the second direction, the base frames, which finished the solder ball reflow step, are transferred in the third direction, and the base frames, which finished the cleaning step, are transferred in the fourth direction toward the empty container transferred to the designated position.