What is the primary focus when inspecting bare circuit boards under IPC-A-610?

When inspecting bare circuit boards under IPC-A-610, the primary focus is on surface defects and dimensional accuracy. This is crucial because bare circuit boards must meet specific standards to ensure that they can function correctly in the final assembly. Surface defects can include issues like scratches, stains, or contaminants that could affect the board's performance or lead to reliability issues once components are mounted.

Dimensional accuracy is also essential, as the physical dimensions of the circuit board must meet the specified tolerances to ensure proper fitting of components and alignments during assembly. While other aspects like overall assembly integrity and component functionality become critical in later stages of production, the initial inspection of bare circuit boards primarily emphasizes ensuring that the surface is free of defects and that dimensions conform to the required specifications.