Reasons for not heating: 1. The voltage is low. If the voltage at home is lower than 187V, the high-voltage transformer in the microwave oven will not work, so microwaves cannot be generated. It is best to avoid peak power consumption. 2. It may be that the circuit of the high-voltage transformer has fallen off, causing it to fail to work normally. It is recommended to contact after-sales service. There are high-voltage components inside, exceeding 4000V.

Look at the replacement method: remove the power transformer, unplug the power plug first, remove the cover and discharge the capacitor, remove all leads of the primary transformer and filament, and remove the mounting bolts fixing the transformer from under the chassis. , then take out the transformer, reinstall the new transformer, and test the machine to eliminate the fault. The microwave oven can operate normally, but cannot heat. One of the magnetrons, transformers, grounding bidirectional tubes (high-voltage diodes), high-voltage fuses, and high-voltage capacitors in the high-voltage part of the oven is broken. Those with some manual skills can disassemble the shell by themselves. Check whether the high-voltage fuse with plastic shell is burned out and replace it with a test machine of the same specification. The problem may be solved.

If it is invalid, the magnetron and high-voltage diode are more likely to be damaged, and the capacitance decrease will also cause the furnace to not generate heat during operation (if the insulation to the ground is poor, the fuse and high-voltage diode will burn). You can disassemble and inspect it by yourself. First, use a multimeter to measure the high-voltage diode with a 10K scale. If one direction is blocked, the other direction is about 30~150K (not uniform). If the normal measurement of the magnetron (both feet of the filament × 1 scale is passed), If the capacitance capacity drops, you must use a capacitance meter to determine (and check that its insulation to ground must be qualified). The possibility of the transformer being broken is very small.

Because excessive microwaves are harmful to the human body, microwave oven user manuals generally state "Do not expose to radiation emitted by microwave generators or other components that conduct microwave energy." This requires the following three points to be achieved during maintenance: 1. Before opening the casing of the microwave oven and powering on for test or maintenance, you should unplug the primary plug of the high-voltage transformer; 2. When checking non-furnace door faults and repairing non-furnace door switch parts, do not twist or remove the furnace door switch fixing screws; 3. When repairing a faulty automatic start machine, do not test the machine with the furnace door open.