Soldering method of chip resistors and capacitors
1. Preheat the soldering iron after connecting the soldering machine to the power supply
2. Identification The soldering methods of chip resistors and capacitors are generally the same, and the soldering points are also very similar. They are two flat contact points, but there is a white line between the contact points of the capacitor to distinguish the soldering points of the resistor. The size of chip resistors and capacitors is very small, and some have only two or three hairs large and chip resistors are already. Resistors are generally black, and there are corresponding numbers on the back of the trademark to represent their specifications. There will also be a corresponding mark on the circuit board to mark its location. If "R+number" is marked next to the corresponding resistance welding point, just solder it accordingly. This resistance is irrespective of positive or negative, and the chip capacitor is not necessarily. Negative The positive and negative SMD capacitors are generally small squares, and all four sides of the chip capacitors can be used as welding surfaces. Capacitors with positive and negative poles are relatively large. The capacitor has only one welding surface. The positive electrode is marked with a dark straight line on the back. The welding point marked with "C+number" on the circuit board is the welding point of the capacitor. The positive and negative poles at the end with a "+" sign are the positive poles.
3. Positioning First, use an electric soldering iron to melt a little solder to one of the soldering points, then use tweezers to pick up the chip resistors and capacitors and place them on the soldering points, and then use the electric soldering iron to melt the solder just up to the point, so that one end of the resistors and capacitors are soldered first Above, fixed resistance and capacitance. Note: The resistor and capacitor should be placed right in the middle of the two soldering points. If the deviation is relatively large, use a soldering iron to melt the solder again, and fine-tune the position of the resistor and capacitor so that they are right in the middle.
4. For soldering, first melt some solder to the tip of the soldering iron, and then point to another section of the solder joint.
V. Retouching, after soldering the resistors and capacitors, observe whether the solder joints are qualified and beautiful. If it is not aesthetically pleasing, it should be re-soldered, with appropriate rosin at the point to make the solder surface round.
6. Cleaning, take a cotton ball of mung bean, hold it with tweezers, dip it in the rosin on the surface of the circuit board with 95% alcohol and wash it.