General positioning holes in PCB production The text outlines various types of positioning holes used in the PCB production process, such as pressing positioning holes, mechanical drilling position holes, and copper plating inspecting holes. These holes serve different functions, including aligning layers, positioning for drilling and soldermask application, and ensuring the integrity of copper plating. The document highlights that these positioning holes are used in the production panel by the PCB supplier and do not appear in individual PCBs, with exceptions for special processing boards like HDI and laser drilling PCBs.
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