![]() These are existing footprints on a PCB document. To illustrate the use of this tool, consider the component footprints shown below. All source libraries must be part of the Available Libraries set. The references to the underlying libraries - from where the footprints are sourced - are retrieved from the applicable schematic if available, or from the PCB footprints themselves. In the case of the latter, the libraries used in the update are those referenced in the corresponding records of the linked external database. This command covers all PCB components, irrespective of the type of library from which they are sourced - PCB Footprint Libraries ( *.PcbLib), Integrated Libraries ( *.IntLib), and Database Libraries ( *.DbLib, *.SVNDbLib). This ensures that all footprints in the design adhere to the authorized footprint libraries. This update tool checks the component footprints on a board against the corresponding footprints in source PCB Footprint libraries by performing a physical comparison of each footprint's primitives, and performs updates to chosen components, as required. To pass on changes to the graphical attributes of a PCB footprint from the source PCB Footprint library requires the use of another tool from Altium Designer's update arsenal - Update From PCB Libraries. Although models can be included as part of that update, it is the model linking that is being considered and not the actual graphical attributes of the linked model. The Update From Libraries and the Update Selected From Libraries commands explained here are used solely to update placed components on schematic sheets. Applying Changes Directly From the PCB Library Editor.
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