After switching on the soldering iron, why does it not heat up?
If the soldering iron does not heat up when it is powered on, it is usually caused by the power cord falling off or the core wire of the soldering iron being broken. When encountering this fault, you can use the R×lkn block of the multimeter to measure both ends of the power plug. If the multimeter pointer does not move, it means there is an open circuit fault.
First, check whether the leads of the plug itself are open. If not, remove the bakelite handle, and then use a multimeter to measure the two leads of the soldering iron core. If the multimeter pointer still does not move, it means that the soldering iron core is damaged and the soldering iron core should be replaced. The resistance between the two leads of a 35W internally heated soldering iron core is about 1.Skfl. If the measured resistance value is normal, it means that the soldering iron core is good. The fault occurs in the power lead and the plug itself. Most faults are lead wire breakage.
When replacing the soldering iron core, insert a new soldering iron core of the same specification into the connecting rod, fix the lead on the fixing screw, and tighten the terminal. At the same time, be careful to cut off the excess part of the soldering iron core lead to prevent the two leads from short-circuiting.
Electric soldering iron: A tool for electronic production and electrical appliance repair. It generally consists of a soldering iron head, a soldering iron core, a shell, a wooden handle, a power lead, a plug, etc. It is mainly used for welding components and wires.
The working principle of the electric soldering iron: After the power is turned on, the heat is generated through the resistance wire of the soldering iron core and transferred to the soldering iron head, which melts the solder to perform work.
The main reason why the soldering iron is not hot may be that the resistance wire in the soldering iron head is burned out. This is a vulnerable part of the soldering iron. Just replace the soldering iron core. However, faults with the power cord and plug cannot be ruled out. Therefore, if the soldering iron is not hot, you should first check the power plug and power cord with a multimeter, and then check the soldering iron core after troubleshooting.
