The cause of electric soldering iron leakage and how to deal with it
The soldering iron core is composed of an electric heating wire, an insulation layer bracket, and an insulation layer. When the insulation layer is too damp or aged for too long, the insulation degree may decrease, leading to leakage of the soldering iron core. Then it is transmitted through the heat transfer shell and soldering iron tip of the electric soldering iron.
The handle of an electric soldering iron can also experience leakage faults after excessive specialization.
After the electric soldering iron leaks electricity, the problem is very serious and can easily cause electric shock accidents, posing great harm to people and electronic and electrical equipment to be repaired. Please replace the soldering iron core and leakage components immediately, and if necessary, replace them as a whole.
How to deal with electric soldering iron leakage
1. First, adjust the multimeter to AC voltage mode. Connect the black probe to ground and the red probe to the tip of the soldering iron. Observe whether the multimeter reads. If there is a reading, it indicates that the soldering iron is leaking electricity and needs to be repaired.
2. Disassemble the soldering iron and locate the internal grounding mark. Then, follow the grounding wire to find the resistor connected to the circuit board and measure its resistance value. If it exceeds 5 ohms, it is judged as burnt out and needs to be replaced (in most cases, this resistor is damaged due to leakage). If the resistance value is normal, please confirm whether the soldering iron plug has good contact.
3. Remove the burnt resistor and replace it with a new one. Note that although the resistance of this resistor is 0 ohms, it serves a protective purpose. Do not short-circuit this area!
5. After replacement, use a multimeter to confirm the resistance value between the remote measurement of the resistor and the ground.
6. After the repair is completed, use a multimeter to confirm the resistance value between the soldering iron tip and the ground wire. If the resistance value is within 2 ohms, it proves that the repair is successful.
