Method for detecting induction melting furnace by replacement method

    The replacement method is to replace a suspected and inconveniently measured electrical component or circuit board on a fault-sensing melting furnace with an electrical component or circuit board of the same specification and good performance, thereby judging a fault detecting method. Sometimes the fault is more concealed. The cause of the failure of some circuits is not easy to determine or when the length of the inspection is too long, it can be replaced by components with the same specifications and good type. In order to narrow down the fault range, go to the next step to find the fault and confirm whether the fault is caused by this component.

When using the replacement method, it should be noted that when the electrical components or circuit boards suspected to be faulty on the original  induction melting furnace  are removed, the peripheral circuits of the electrical components or circuit boards should be carefully checked, only when the peripheral circuits are normal. In order to replace the new electrical components or boards, to avoid damage after replacement.

    In addition, due to the fault state of some components (such as capacitor capacity reduction or leakage, etc.) can not be determined with a multimeter, then should be replaced with genuine or connected to the genuine device to see if the fault phenomenon has changed. If the capacitor insulation is suspected to be poor or short-circuited, the end must be disconnected during the test. When replacing components, replace the components as much as possible with the damaged component specifications.

    When the fault analysis results are concentrated on a certain printed circuit board, it is very difficult to implement the fault on a certain area or even an electrical component due to the continuous integration of the circuit, in order to shorten the fault inspection time. In the case of the same spare parts, you can replace the spare parts first, and then check the repaired fault board. Pay attention to the following issues when replacing spare parts.

    (1) Replacement of any spare parts must be carried out in the event of a power failure.

    (2) Many printed circuit boards have some setting switches or shorting bars to match the actual needs. Therefore, it is necessary to record the original switch position and setting state and the connection mode of the shorting bar on the replacement spare parts. The new board will do the same, otherwise an alarm will be generated and the unit circuit will not work properly.

    (3) Some printed circuit boards need to perform certain operations after replacement to complete the establishment of their software and parameters. This requires careful reading of the instructions for the appropriate board.

    (4) Some printed circuit boards cannot be easily pulled out, such as boards containing working memory, or have spare battery boards. Pulling out will lose useful parameters or programs. Follow the instructions when replacing.

    (5) It is strictly forbidden to use the replacement method on a large scale. This will not only achieve the purpose of repairing the fault induction melting furnace, but will even advance.

Expand the scope of the fault in one step.

    (6) The replacement method is generally used when there is significant doubt about a component after the application of other detection methods.

    (7) When the electrical components to be replaced are at the bottom, the replacement method should also be used with caution. If it must be used, it should be fully disassembled to expose the components, and have sufficient operation space for easy replacement.