Why does the soldering iron not heat up after being idle for a period of time?
1. Not hot at all
If it is not hot at all, use the electrical resistance of a multimeter to measure the resistance of the power cord plug. It must be ∞. Disassemble the soldering iron, remove or peel off the insulating sleeve at the connection between the power cord and the soldering iron core, and measure the resistance at these two points. If there is resistance, it means the core of the soldering iron is good and the problem is with the power cord— ——It was pulled off or the contact in the plug was poor. If the resistance value is still ∞, it means the soldering iron core is broken. The following are two common soldering iron cores: external heating type and internal heating type.
Causes of damage to chromium ferrocore:
●Caused by falling and knocking. Since the heating wires of the chromium iron core are wound on quartz or in ceramic tubes, these insulating media are inherently brittle and become even more brittle once heated. They cannot withstand knocks or hits, otherwise they will break and cause damage.
●The quality of the soldering iron itself is very poor and the heating wire is burned out. Now on the market, soldering irons priced at 3 to 5 yuan each have basically the same appearance as soldering irons sold at tens of yuan each. They can look real, but the quality is very poor and not durable. People often say "you get what you pay for", and it's true.
2. It can heat, but the heat is not enough to melt tin.
The characteristic of this phenomenon is that the soldering iron has black hair and cannot melt the solder. It seems that the heat is not enough, but in fact the soldering iron tip is "burned to death".
If this happens, you can repeatedly dip the soldering iron in rosin and rub it on the tin block while it is still being heated until the soldering iron tip is plated with tin, that is, the color changes from black to bright. For long-life soldering irons with a pointed tip, it is strictly forbidden to use a file to file because the alloy tip will be filed off.
The soldering iron tip and core are consumable materials, and damage is normal. However, mastering the correct use of the soldering iron can extend its service life.
