According to the symptom analysis, fault location should be in the high pressure circuit. After opening the lid to check the parts off the normal plug connector, measuring high voltage fuse ends of lugs nowhere, pry open the plastic box high voltage fuse, high voltage fuse detection has been open. Check the magnetron, high voltage transformers, high voltage capacitors, high voltage diodes and other components were normal. Put a new fuse 5kV/0.75A high pressure, high pressure insurers to recover plastic boxes, tied and secured to the casing in place, install the microwave oven enclosure (enclosure must be installed to prevent power microwave wounding) test machine, fault ruled out.74Mservice manual download site