Bad unit marking method for marking bad units/parts on system carriers for mounting chips uses a non-removable bad unit marking distinguished from the surrounding area by its color

摘要

A fine ball grid array component (1) has a system carrier (SC) (2) supporting strip conductors (3) that link contact surfaces (4) on the SC with a connector block (5). A lasting, non-removable bad unit marking (6) distinguished from the surrounding area by its color is used for marking bad units/parts on the SC.