The instruments and tools needed to repair the intermediate frequency furnace are: digital multimeter or pointer multimeter, double trace oscilloscope above 20MHz, 500V megger, clamp ammeter, electric iron, word or Phillips screwdriver and wrench. The information required to repair the intermediate frequency furnace includes: electrical drawings and instructions related to the intermediate frequency furnace. Before repairing the intermediate frequency furnace, first understand the overall structure of the intermediate frequency furnace, and carefully check whether the main circuit wiring is consistent with the pattern. Check whether the cooling water connection of the product is in compliance with the design requirements, and observe whether the inlet and outlet pipes are blocked or leaking. Understand the failure phenomenon of the intermediate frequency furnace, what happens when the fault occurs, and check the records of the equipment. Before repairing the intermediate frequency furnace, the intermediate frequency furnace must be thoroughly inspected, and all the connecting wires and terminals should be tightened to see if there is any blackening, fire, short circuit or virtual connection. The intermediate frequency furnace is usually composed of load circuit (including furnace switch, water-cooled cable, busbar and furnace induction coil), compensation capacitor, smoothing reactor and control cabinet (including main circuit and control circuit). After the failure of the intermediate frequency furnace, it must be considered from the simple fault to prevent the simple fault from being complicated. Secondly, before the maintenance, the operator should be asked in detail about the phenomenon and related situation when the fault occurs, and the information related to the fault can be found out. Can do more with less. It is true that when conditions and conditions permit (no damage to components), fault recurrence can be implemented, and fault phenomena can be observed in person, which helps to determine the fault range in time, thereby eliminating many unnecessary cumbersome repairs. If the fault range cannot be determined according to the fault phenomenon and related conditions, it must be repaired according to the complicated fault repair procedure. According to the fault phenomenon, the intermediate frequency furnace is divided into two categories, which cannot be started at all and cannot work normally after starting. As a general rule, when a fault occurs, system maintenance should be performed in the event of a power outage.