Heating method to repair induction melting furnace
The heating method artificially raises the ambient temperature or the temperature of a certain component (the ambient temperature of the local components can be raised by the hair dryer, and the temperature cannot be raised too high to avoid burning the components that are working normally) It raises the temperature of suspicious components and accelerates the failure of some components with poor high-temperature parameters to help find faults. Sometimes the intermediate frequency furnace will work for a long time or the ambient temperature will rise, and it will be faulty. When the shutdown is checked, it is normal. After working for a while, it will be faulty. At this time, the heating method can be used to check.
Some induction melting furnaces are very good at the beginning, but it doesn't take long, and it takes a few minutes and a few hours to fail. This is often due to the intermediate frequency furnace heat stability of the individual components due to the worse. Because of the unfixed nature of the fault itself, in the repair process, it is usually necessary to make a rough judgment on the fault location based on its own experience and the characteristics of the fault phenomenon. Use a heating element such as a soldering iron or incandescent lamp to bake components of the suspected part, such as using 20W to heat
The soldering iron is baked with a tip of about 1 cm from the suspect component for the purpose of local heating. If the fault phenomenon is immediately reproduced when it is baked to a certain component, it can be immediately judged to be a malfunction caused by poor thermal stability of the component. The order of temperature rise is first transistor, integrated circuit, post capacitor, and resistor.
Generally, the temperature rise has two meanings. One is to accelerate the damage of the component and make the fault appear as soon as possible. Second, because the machine board is damp, use heating to directly eliminate the fault. The opposite of the temperature rise method is the cooling method, which is usually used in combination with the temperature rising method. The easiest way is to use a cotton sputum on the suspected component to cool it when the intermediate frequency furnace fails. If the fault disappears when cooling to a component, the component is the faulty component. The cooling method is especially suitable for induction melting furnaces that have been normal at the time of starting up and have failed after a period of time .