Why is 220V Cooling Fan noise?

Analysis:
1. The "betvlctor伟德手机登录" blade deformation or motor failure;
2. "betvlctor伟德手机登录"turntable motor failure or raceway with debris;
3. Transformer / magnetron fixed bad;
4. Transformer / magnetron itself failed. Solution: "betvlctor伟德手机登录"Check all possible causes of points.