Reasons for electric leakage in electric soldering iron
The cause of leakage in the soldering iron is mainly caused by the leakage in the soldering iron core.
The soldering iron core is composed of a heating wire, an insulating layer support and an insulating layer. When the insulation layer is exposed to moisture or is used for a long time and ages, the insulation level may decrease, causing leakage of electricity in 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 the electric soldering iron will also suffer from leakage failure after excessive aging.
When a soldering iron leaks electricity, the problem is very serious and can easily cause electric shock accidents, which is extremely harmful to people and electronic and electrical equipment to be repaired. Please replace the soldering iron core and leaking parts immediately, and replace them as a whole if necessary.
How to deal with leakage of electric soldering iron
1. First adjust the multimeter to the AC voltage setting, connect the black test lead to ground, and connect the red test lead to the soldering iron tip. Observe whether the multimeter has a reading. If there is a reading, it proves that the soldering iron has leakage and needs to be repaired.
2. Disassemble the soldering iron, find the internal grounding mark, then find the resistor connected to the circuit board along the grounding wire, and measure its resistance. If it exceeds 5 ohms, it is judged to be burnt and needs to be replaced (the leakage is most likely to be In some cases, the resistor is damaged). If the resistance value is normal, please confirm whether the contact of the soldering iron plug is good.
3. Remove the burned resistor and replace it with a new one. Note that although the resistance of this resistor is 0 ohms, it plays a protective role. Never short-circuit it!
4. After the replacement is completed, use a multimeter to confirm the resistance value between the remote measurement of the resistor and ground.
5. 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, the repair is successful.
