We usually use the computer and mobile phone all need circuit board, printed circuit board is a provider of electronic components and electrical connections, is a lot of electronic products in production needs to be used, because it can reduce wiring and fitting error, improve the level of automation and production rate of labor, many manufacturers have chosen to printed circuit board production, a lot of people do not understand circuit board printing process, FASTPCBA technical personnel for the share of printed circuit board production process:
Production process of printed circuit board:
1. Schematic diagram should be designed first
The design of printed circuit board manufacturing schematic is mainly based on the electrical performance of each component and based on the demand for reasonable construction, which can accurately reflect the important functions of the PCB circuit board and the relationship between each component.Schematic design is the first and most important step in the PCB making process.
2. Encapsulate all components
Schematic design is completed, need to be one step closer to by PROTEL to encapsulate all components, to generate and implement components with the same appearance and size of the grid, PROTEL modification has been completed, to execute the Edit/Set Preference/pin 1 Set packaging reference points on the first pin. Then perform the Report/Component Rule Set up complete check to check the rules, and OK. At this point, encapsulation Set up.
3. Printed circuit board production
Print the printed circuit board on transfer paper. Pay attention to the slide side facing to yourself. Generally print two circuit boards, that is, two circuit boards on one paper.
4. Printed circuit board production
The designed PCB diagram is printed and output through an inkjet printer using a special carbon paper. Then, one side of the printed circuit diagram is pressed against the copper plate, and finally the circuit diagram is put on the heat exchanger for thermal printing. The ink of the circuit diagram on the carbon paper is glued to the copper plate at high temperature.Mix the sulfuric acid and hydrogen peroxide at 3:1. After the copper plate is corroded except for the ink, remove the copper plate and rinse the solution with water.
5. Drill hole for PCB
The circuit board shall be inserted into the electronic component, so the circuit board shall be drilled. Different drill pins shall be selected according to the thickness of the electronic component pin. When drilling the drill, the circuit board must be stable and the drill speed cannot be too slow.
6. PCB pretreatment
After drilling, sand off the toner covering the circuit board with fine sandpaper, and clean the circuit board with clean water.When the water is dry, apply rosin water on one side of the circuit. In order to accelerate the solidification of rosin, we heat the circuit board with a thermal fan. The rosin can solidify in 2-3 minutes.
The PCB circuit board production process is Shared here today. After PCB production, the entire circuit board shall be tested. If there are problems during the test, the problem location shall be determined through the schematic diagram designed in the first step, and then the components shall be soldered or replaced.When the test passed, the entire circuit board was finished.
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