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38 SMT Magazine • April 2016 information is also one example of data that can be fed back to design so that with the next iteration of this PCB, or the next product, the testability risks can be designed out. process Documentation Shop floor documentation can be created from the prepared single engineering product data model. Documentation, whether deliv- ered electronically through a web-browser or on paper is an essential part of any operation where a manual "touch" will be required. Some documentation is static, that is, a fixed image provided as a reference for any particular opera- tion. More interesting is the dynamic documen- tation that follows the working process, which can zoom in to features of interest providing a much larger and contextual amount of value. Documentation that dynamically highlights recent changes in the operation is critical to avoiding mistakes and can greatly improve the level of quality of manual operations. The major use for documentation is work instructions. For assembly workstations, prep- aration of work instructions involves the as- signment and sequencing of manual opera- tions to ensure that all placements are visible and accessible for the human hand at the time of execution. The order in which components can be placed is driven from this logic, and work instructions are created. The work in- structions need to show precisely yet simply the method for correct assembly. These can be used for PCB assembly as well as final product assembly. For repair stations, the documentation is triggered dynamically by a test failure report. In this case, the appropriate area of the product needs to be highlighted quickly and automati- cally so that the suspected failure can quickly be found and compared to what it should be. Digging deeper dynamically in to the product information is essential for accurate and timely repair. Figure 11: Automatic rotation normalization is used to account for inconsistencies in design data. bEsT-PracTicE ProcEss PrEParaTion for Pcb assEmblY