First check the tire wheel assembly of the dynamic balance is correct, check whether the tires wear evenly; block assembly to check the balance is correct.
要先检查车轮的动平衡轮胎装配是否正确，检查轮胎磨损是否均匀；检查平衡块装配是否正确。
Check EXF blades whether dynamic balance or not, base of motor whether tighten or not;
检查排风机扇叶是否动平衡，马达基座是否紧固；
Check EXF blades whether dynamic balance or not, base of motor whether tighten or not;
检查排风机扇叶是否动平衡，马达基座是否紧固；
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