With the improvement of people's living standards and living conditions, as well as people's requirements for comfort and energy saving, people's pursuit for the beauty and reliability of refrigerators is also changing. As a key component of the control system, the quality of circuit boards is important. The quality of circuit boards directly affects the life of refrigerators. How to make a good circuit board? What do you do?
Select grade A military board, print out the printed circuit board with transfer paper, the slippery side faces itself, generally print two printed circuit boards, choose the printed circuit board with good printing effect. The printed circuit board is made of photosensitive board. The copper clad board is cut into the size of the printed circuit board. The oxide layer on the surface of the copper clad board is polished with fine sand paper to ensure that the carbon powder on the heat transfer paper can be firmly printed on the printed circuit board.
One side of printed circuit board is pasted on the copper clad board, and the copper clad board is aligned and put on the heat transfer machine. When putting it in place, it is necessary to ensure that the transfer paper is not misplaced. Generally, the printed circuit board can be firmly transferred on the copper clad board through 2-3 transfers. If there are a few places that have not been transferred, they can be repaired with black greasy pen. The next step is the corrosion step. When the copper film exposed on the circuit board is completely corroded, the circuit board will be removed from the corrosive solution and cleaned, so that a circuit board will be corroded.
PCB drilling because PCB is to insert electronic components, according to the size of electronic components pins to choose different drilling pins. After the drilling is completed, the ink coated on the circuit board is polished with fine sandpaper and the circuit board is cleaned with clean water. After the water on the PCB is dried, the perfume is applied to the printed side, and the perfume is solidified faster. The hotplate can be used to heat the circuit board, and the rosin can be completely solidified in 2-3 minutes. Finally, the components are welded on the PCB.