How to detect electric leakage of electric soldering iron?
First adjust the multimeter to the AC voltage gear, connect the black test lead to the ground, and connect the red test lead to the tip of the electric iron, and observe whether the multimeter has a reading. If there is a reading, it proves that the electric soldering iron has leakage and needs to be repaired
Disassemble the electric soldering iron, find the internal grounding mark, and then find the resistor 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 (in most cases of leakage The resistor below is damaged), and if the resistance value is normal, please confirm whether the contact of the soldering iron plug is good
Remove the burnt resistor and replace it with a new one. Note that although the resistance value of this resistor is 0 ohms, it is for protection. Do not short circuit here!
After the replacement, use a multimeter to confirm the resistance value between the remote measurement of the resistance and the ground
