How to deal with the leakage of electric soldering iron _ Causes of electric soldering iron leakage
Causes of leakage of electric soldering iron
The leakage of soldering iron is mainly caused by the leakage of soldering iron core.
The soldering iron core is composed of heating wire, insulating bracket and insulating layer. When the insulating layer is wet and used for a long time, the insulation degree may decrease, resulting in leakage of the soldering iron core. And then passes through the heat transfer shell of the electric soldering iron and welding head.
The handle of electric soldering iron will also have leakage fault after excessive aging and specialization.
After the electric soldering iron leaks, the problem is very serious, which can easily lead to electric shock accidents, which is extremely harmful to people and electronic and electrical equipment to be repaired. Please replace the soldering iron core and leakage parts immediately, or replace them as a whole if necessary.
How to deal with the leakage of electric soldering iron
1. First set the multimeter to the AC voltage block, connect the black probe to the ground, connect the red probe to the soldering iron head, and observe whether the multimeter has any reading. If there is any reading, it proves that the soldering iron has leakage and needs to be repaired.
2. Disassemble the electric soldering iron, find the internal grounding sign, then find the resistance connected to the circuit board along the grounding wire, and measure its resistance value. If it exceeds 5 ohms, it is judged to be burnt and needs to be replaced (this resistance is damaged in most cases of electric leakage). In addition, if the resistance value is normal, please confirm whether the contact of the soldering iron plug is good.
3. Remove the burnt resistor and replace it with a new resistor. Note that although the resistance of this resistor is 0 ohm, it plays a protective role. Never short-circuit here!
5. After the replacement, use a multimeter to measure the resistance between the remote ground and the ground to confirm the resistance.
6. After the repair, use a multimeter to confirm the resistance between the welding head and the ground wire. If the resistance is within 2 ohms, the repair is successful.
