Source: Beijing Sanyo Washing Machine After-sales Service Phone Number http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3442560. Fault Analysis: Check that the washing machine is installed normally, with no loose fasteners, indicating that the weak wash transmission system is malfunctioning. For Sanyo washing machines, there is a significant impact sound during weak wash mode. Fault Inspection: Open the back cover of the washing machine and check the fit between the paddle wheel and the pulley with the shaft. It was found that the gap between the shaft and the hole is relatively large, which will cause an impact sound when the washing machine is running. Under normal circumstances, there should be no gap. Use a shim repair method to fix it. Clean the shaft and hole, and according to the degree of looseness, use plastic tape as a shim material. For areas where the shaft and hole wear is more severe, you can wrap a few more layers until the shaft can be tightly inserted into the hole without any gap. Sometimes, if the paddle wheel shaft hole is worn out and cannot be used anymore, you can make a sleeve with thin iron sheets that matches the shape of the shaft head, fix the sleeve in the paddle wheel hole, ensuring concentricity and perpendicularity between the shaft and the paddle wheel plane. Then fill the surrounding gaps with strong adhesive. After the adhesive solidifies, install the paddle wheel and test the machine. The washing machine works normally, and the fault is resolved.