PCB Technical - PCB copy board-circuit board split

Before PCB copying, the circuit board needs to be disassembled, the integrated circuit and other components are removed to make a BOM list, and the disassembled, and then the bare PCB board is scanned and copied. In this process, how to disassemble correctly The integrated circuit on the PCB circuit board is also a very important link. Not only in the process of PCB copying, but sometimes in circuit maintenance, the integrated circuit is often removed from the printed circuit board. However, the integrated circuit has many and dense pins and it is difficult to disassemble. If the operation is not performed properly, it is easy to damage the integrated circuit and the circuit. plate.

So here is the editor of the PCB copy board company to tell you a few accurate methods of disassembling integrated circuits. The first method of disassembly of the solder sucker is to use the solder sucker to disassemble the integrated block. This is one of the more commonly used professional methods in the industry. The tool required for disassembly is an ordinary suction and soldering electric soldering iron with a power of 35W or more. . When disassembling the integrated block, put the heated dual-purpose electric soldering iron tip on the pin of the integrated block to be disassembled. After the solder joint is melted, it will be sucked into the thinner.

After the solder of all the pins is sucked, the integrated block Can be removed. The second method of disassembling medical hollow needles: Take several medical hollow needles of 8 to 12 gauge. It is advisable for the inner warp of the needle to just cover the pins of the integrated block when using it. When disassembling, use a soldering iron to melt the pin solder, put the needle on the pin in time, then remove the soldering iron and rotate the needle, and then pull out the needle after the solder solidifies. In this way, the pin is completely separated from the printed board. After doing this for all pins, the integrated block can be easily removed. The third method of disassembly with electric soldering iron brush: This method is simple and easy to use, only an electric soldering iron and a small brush are needed. When disassembling the integrated block, heat the electric soldering iron first, and after the solder on the pins is melted by the melting temperature, take the opportunity to wipe off the melted solder with a brush. In this way, the pins of the integrated block can be separated from the printed circuit board. This method can be carried out separately or separately. Finally, use sharp tweezers or a small "one" screwdriver to pry off the integrated block. The fourth method of adding solder melting and disassembly: This method is a time-saving method, just add some solder to the pins of the integrated block to be disassembled, so that the solder joints of each column of pins are connected, so as to facilitate heat transfer. Easy to disassemble. When disassembling, use an electric soldering iron to heat each row of pins with a sharp tweezers or a small "one" screwdriver to pry, and the two rows of pins are heated alternately until they are removed. Generally, each column of pins can be removed by heating them twice. The fifth method of disassembling multi-strand copper wire with tin suction: is to use multi-strand copper-core plastic wire to remove the plastic sheath, and use multi-strand copper core wire (short wire ends can be used). Before use, put the rosin alcohol solution on the multiple copper core wires. After the electric soldering iron is heated, put the multiple copper core wires on the pins of the integrated block and heat them, so that the solder on the pins will be absorbed by the copper wires. The upper part of the solder can be cut off, and the solder on the pins can be completely sucked away by repeating it several times. The braided wire in the shielded wire can also be used if possible. As long as the solder is sucked up, use tweezers or a small "one" screwdriver to gently pry, and the integrated block can be removed.

The above five methods are all used to split the circuit board, which is also a necessary part of the PCB copy board. If the PCB copy board is necessary for the splitting of the circuit board.