As discussed earlier，some industries have adopted a form of six sig- ma that is based on target values of Cpk. Examples are the auto industries with the QS 9000 (Cpk 1.67 for new and 1.33 for old prod...

DPMO and OMI are good tools to calculate PCB assembly line yield and to compare and benchmark electronic PCB assembly in the supply chain. Issues that arise with the implementation of the DPMO and OMI...

DPMO charts are attribute charts used to monitor the quality of PCB assembly lines. They are best used instead of attribute defect charts such as U or C charts. Each type of PCB can be charted every t...

In the previous example, the yield calculations involved two types opportunities—components and solder joints or terminations. This is similar to the problem presented in Figure 4,1, where the IC wast...

The defect rate for new PCBs is usually calculated based on process observations for existing PCBs. Assuming a PCB with through-hole technology, defects are usually obtained from three sources: incomi...

The electronic products being developed today are more complex than previous products. The number of components on each printed circuit board (PCB) is increasing，as well as the total number 〇f PCBs in...

Operations or Design SpecificationsA typical production line consists of multiple sources of materials and multiple distinct operations for fabrication and assembly of parts into the next-higher level...

A product contains 10 PCBs, and a goal of 95% turn on yield was 3et for each PCB at in-circuit test (ICT). The product final test turn-on yield will be as follows:A turn-on yield of 61% is disappointi...