Observe the microwave oven when using the lamp housing, dial in normal operation, the fan is running normal, but the sound is relatively large, the food is not hot oven cavity.hjBservice manual download site

According to analysis of failure phenomena in the high-pressure part of the site should be. Disconnect the power, open the case for testing, measuring high: voltage fuse open. Examination revealed the magnetron is shorted to ground, measuring high voltage transformers, high-voltage capacitors and high voltage diodes so normal. High voltage fuse pry plastic box put a new 5kV/0.75A.hjBservice manual download site

High voltage fuse and a new magnetron, test machine all the normal sound of the fan is relatively small. Replaced the magnetic pull on the tube for testing. Magnetron itself found little resistance, which is normal, but there magnetron outside light resistance 100Ω, which is obviously not normal, indicating serious ground magnetron filament leakage, which is the high-voltage fuse is blown reason.hjBservice manual download site