Design requirements: The designer must read the schematic diagram in detail, fully communicate with the project engineer, understand the circuit architecture, understand the working principle of the circuit, and clearly understand the layout and routing requirements of key signals.
After the following procedures, the finishing work shall be undertaken by the operator responsible for PCB board testing and repair, unless otherwise arranged. The final installer shall be responsible for reviewing and correcting the reinstallation.
Remarks: The grinding process between silk screen and solder mask may be omitted. It can be soldered first and then screen printed, depending on the substrate.
PCB material are divided into: 94HB, fireproof board (94VO, FR-1, FR-2), semi-glass (22F, CEM-1, CEM-3), and full glass (FR-4).
Via is one of the important components of a multi-layer PCB. The cost of drilling is usually 30% to 40% of the cost of PCB board. Simply put, each hole in the PCB can be called a via.