Case Analysis of Samsung Microwave Repair: Microwave Fan Not Spinning
Fault Phenomenon: After pressing the power start switch, the temperature inside the oven rises quickly, and the temperature holding relay acts frequently, unable to heat food.
Analysis and Inspection: Upon inspection, it was found that the cooling fan was not spinning. The reasons for the fan not spinning are as follows:
1. Burnt-out windings in the fan motor;
2. Open circuit in the fan motor wiring;
3. Fan blades detached from the motor shaft.
Upon checking, no abnormalities were found in the fan motor wiring, and the fan impeller was securely fixed. A preliminary judgment was made that the fan motor was burnt out. The fan motor was removed and tested with a multimeter set to the R10Ω range, which showed an infinite resistance value for the fan motor winding, indicating an open circuit in the motor winding.
Repair Measures: Replace the shaded-pole fan motor with one of the same specification, resolving the fault.
Source: Beijing Samsung Microwave Oven After-sales Service Phone http://blog.sina.com.cn/sxweibolu.