PCB circuit board production process

1, according to the circuit function need to design the schematic diagram. Schematic design is mainly based on the electrical properties of the components according to the need to build a reasonable, through the diagram can accurately reflect the important functions of the PCB circuit board, as well as the relationship between the various components. Schematic design is the first step in the PCB production process, but also a very important step. Usually the design of the circuit schematic using software is PROTEl.

2, schematic design is completed, the need for a closer step through the PROTEL package of components to generate and realize the components have the same appearance and size of the grid.

3, the formal generation of PCB. network generation, it is necessary to PCB panel size to place the location of each component, in the placement of the need to ensure that the lead of each component does not cross. Placement of components is completed, the final DRC check to exclude the components in the wiring of the pin or lead crossing error, when all the errors are excluded, a complete pcb design process is complete.

4, the use of specialized copy paper will be designed to complete the PCB diagram through the inkjet printer printout, and then printed circuit diagrams of the side of the copper board and the relative pressure, and finally put on a heat exchanger for thermal printing, through the high temperature will be copying the circuit diagrams on the ink on the paper to stick to the copper board.

5, plate making. Modulation solution, sulfuric acid and hydrogen peroxide according to 3:1 modulation, and then will contain the ink into the copper plate, and so on three to four minutes or so, and so on the copper plate in addition to the ink on the place of all the corrosion, will be removed, and then the water will be rinsed out of the solution.

6, punch. The use of chiseling machine will need to leave holes in the copper plate for punching holes, after the completion of each matching components from the back of the copper plate will be two or more pins into, and then use the soldering tool will be components welded to the copper plate.

7, welding work is completed, the entire circuit board for a comprehensive test work, if there are problems in the test process, it is necessary to design the schematic diagram through the first step to determine the location of the problem, and then re-welded or replaced components. When the test passed successfully, the entire circuit board is completed.