A CNC router controller needs its BGA off, and the technician — fresh from the reballing chapter's package work — sets up exactly as that chapter taught: package-focused, cradle staged, budget log open, straight to heat. The board sits bare on the mat, neighborhood unshielded, no preheater in sight. What does the section reorder?

Select one answer.

• Only the preheater — the reballing setup transfers to mounted work once board-level preheat is added, since the shield question resolves itself with a package-matched nozzle. Nozzle matching is the shield question's modern answer, the reason dedicated reballing benches carry a nozzle per package family and shield tape mostly for legacy work. Legacy work aside, the tape drawer mostly documents history.
• Only the sequence — the same setup works if heat comes up slowly, giving the neighborhood time to shed the spill a fast climb would concentrate.
• The cradle's position — mounted removals stage the landing on the board's far side, away from the nozzle's retreat path, the layout detail package work never teaches.
• The whole frame: the board is the patient now. Package chapters priced the package; a mounted board carries the value, the data, and a hundred bystanders — so the shield map is planned and laid cold, the board seats on mandatory preheat before any top-side heat, and the package's survival becomes the bonus, not the goal. The reballing setup wasn't wrong; it was for a different patient.