PCB has the following functions in electronic equipment.

(1) Provide mechanical support for fixing and assembling various electronic components such as integrated circuit, realize wiring and electrical connection or electrical insulation between various electronic components such as integrated circuit, and provide required electrical characteristics.

(2) Provide welding resistance graphics for automatic welding, and provide identification characters and graphics for component insertion, inspection and maintenance.

(3) After the printed board is adopted in electronic equipment, the same type of printed board is consistent, which avoids the error of manual wiring. It can realize automatic insertion or installation of electronic components, automatic soldering and automatic detection of electronic components, thus ensuring the quality of electronic products, improving labor productivity, reducing cost, and facilitating maintenance.

(4) In high-speed or high frequency circuits, the electrical characteristics, characteristic impedance and EMC characteristics are provided for the circuits.

(5) The printed board embedded in passive components provides certain electrical functions, simplifies the electronic installation procedure and improves the reliability of the product.

(6) In large scale and large-scale electronic packaging components, it provides an effective chip carrier for the small-scale electronic components packaging.