medium frequency furnace maintenance: the main control board is not normal maintenance

Each main control board undergoes strict aging screening before leaving the factory, and the main control board is completely optically isolated from the main circuit when working, so there is very little chance of failure. If the following phenomenon occurs, the main control board may be considered damaged, and the technician should be notified to repair it. Protection of these phenomena: lack of rectification or inverter trigger pulse, press the start button does not respond or can not start, the frequency can not be locked after starting, the power can not be adjusted, obviously the operating temperature of a component on the control board is abnormal.