1. Immediately ask the engineering SOP production personnel to clearly define and explain the existing operation instructions, and issue SOP immediately;<br>2. After the product is assembled, 100% self inspection is required, and 100% inspection is carried out at the terminal appearance inspection post. The screw must be assembled in place before it can flow into the next process. IPQC supervises the implementation. If this problem is horizontally unfolded, the on-site quality control shall inspect and supervise according to this requirement.<br>