The main recommendation for disassembly of high-pin density components in SMT pcb online china patch processing is to use a hot air gun, clamp the components with tweezers, blow all the pins back and forth with the hot air gun, and lift the components when they are melted. If you need to disassemble the parts, do not blow to the center of the parts, and the time should be as short as possible. After removing the parts, clean the gasket with a soldering iron.
1. For SMT components with a small number of pins, such as resistors, capacitors, bipolars and triodes, first tin plating on a pad on the PCB board, and then use tweezers to clamp the components in the mounting position with your left hand and fix them On the circuit board, use the right hand to solder the pins on the pads to the pads sold. The tweezers in the left hand can be loosened, and the remaining feet can be soldered with tin wires. This kind of part is also easy to disassemble, as long as both ends of the part and the soldering iron are heated at the same time, and the tin is melted and lifted slightly to disassemble.
2. A similar method is used for chip components with a large number of needles and wide spacing. First, tin plating on the pad, then use tweezers to clamp the component on the left to solder one foot, and then solder the other foot with tin wire. It is usually better to disassemble these parts with a heat gun. On the other hand, the solder is melted by holding a hot air gun. On the other hand, when the solder is melted, parts are removed with a jig such as tweezers.
3. For the parts with high sales density, the welding technology is similar. First, solder the legs and use the wire to weld the remaining legs. The number of feet is large and dense, and the alignment of nails and mats is important. Usually, the pads on the corners are plated with a small amount of tin, and the parts are aligned with the pads with tweezers or hands. The edges of the sale are aligned. These parts are pressed slightly harder on the printed circuit board, and the pins on the pads are soldered with a soldering iron.
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