Work microwave circuit including primary and secondary two parts, of which there is a fault will affect any part of the microwave oven is working properly . Overhaul , generally based on primary and secondary transformer failure analysis to determine the boundary to the site . Now an example to boot burning fuse immediately , to illustrate the repair methods.CbDservice manual download site

1 First, disconnect the high voltage transformer secondary high voltage circuit . High voltage side of the transformer secondary plug ( unplug the connection point with the high-voltage capacitors ) . So that is able to quickly determine the location of the fault generated , and can ensure the safety of maintenance work. Burning fuse element is normally provided by a short circuit caused by the machine , but to find which one component is short-circuited , but also for further examination .CbDservice manual download site
 CbDservice manual download site
2 replaced the original specifications of the fuse ( typically 6 ~ 10A) re- energized. As fans , rotary motors are operating normally , the power control system and transformers were normal, while failure in the high voltage circuit system. Then you can check the high voltage capacitor ( general specifications for 1μF/2100V), Special Note: be sure to discharge and then charge and discharge multimeter to measure its properties, such as resistance to 0 , then it is a short circuit ; or resistance is ∞, then lose charge discharge performance, so there is no high voltage output , microwave magnetron without high pressure without work . Then measure the voltage diode forward resistance 150kΩ, reverse ∞ is normal. Common failure is the breakdown of high voltage capacitors , high voltage transformer secondary winding directly through the diode short circuit current is too large to burn the machine fuses.CbDservice manual download site

After 3 energized immediately blown fuse inside the machine , then the normal high voltage circuit can be judged , and the fault lies in the transformer itself or power control circuit. The ends of the primary winding of the transformer plug unplug , not after power fuse blows , the power control circuit is also normal , indicating a transformer damage . This is generally less. If the plug end of the transformer primary disconnect the power, the machine is still within the fuse blows , the fault certainly lies in the power control circuit, such as primary switches and secondary switches , control switches , rotary motors , such as a short circuit caused by burning need a multimeter to measure check , you can find out .

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