The first piece of inspection is a mass inspection mechanism for PCBA accident prevention errors. It is to check, confirm and test the first product. The first inspection is to find out the problems that affect the quality of products in production as soon as possible to prevent batch defects or scrap. Only after the first test passes all tests can mass production begin, which can reduce the risk of wrong parts, reduce the probability of errors, and effectively improve production quality.

Application scenarios generally include:

1. Launch of new products for the first time

2. Start or handover of each work shift

3. Change product models

4. Adjust equipment, fixtures, loading fixtures,

5. Change technical conditions, process methods and process parameters

6. Use new materials or materials for replacement

Precautions for the first inspection of PCBA processing:

1. Take protective measures, such as electrostatic protection, and correct data;

2. Whether the position, polarity, angle, etc. of the mounted components meet the requirements of the technical documents;

3. Whether the quality of the incoming components is qualified, such as: component color, component size, positive and negative poles, etc.;

4. Whether the welding quality of parts meets the requirements of customers or relevant technical documents;

5. The inspector shall mark the first piece that passes the inspection by regulations;

6. The first piece inspection must be timely to avoid reducing production efficiency;

7. If the first piece is not inspected and qualified, processing or operation shall not be continued.

Purpose of the first inspection

1. The first inspection in the production process is mainly to prevent the batch of products from exceeding the tolerance and being scrapped. It is a means of pre-control in the production process, an important method of product process quality control, and an effective and necessary method for enterprises to ensure product quality and improve economic benefits;

2. In the production process, factors affecting product quality should be discovered as early as possible to prevent batch defects or scrapping;

3. Only after the first inspection is qualified can formal production be entered, mainly to prevent the occurrence of batch defective products;

4. Long-term practical experience has proved that the first inspection system is an effective measure to find problems as soon as possible and prevent batch scrapping of products. Through the first inspection, it can be found that the tool fixture is seriously worn or the installation positioning error, the measuring instrument has poor accuracy, the drawing error, the feeding or formula error and other system reasons can be found, and corrective or improvement measures can be taken to prevent the occurrence of batch defective products.

PCBA processing first inspection mechanism

1. Self-inspection: Engineers mainly conduct self-inspection by on-site engineers, mainly led by on-site engineers. Engineers can conduct self-inspection based on the above-confirmed information, focusing on the direction of the components and the patch effect.

2. Mutual inspection: After the engineer's inspection, the operators will be inspected. The focus is on checking the BOM and drawings, whether there is any missing material, etc. If any objection is found, notify the production engineer immediately to solve it.

3. Comprehensive inspection: After passing the inspection, send it to the quality inspector for a comprehensive inspection. Generally, a multimeter or ECR bridge is used, and the focus is on component measurement and component direction. If there is, the BGA needs to use the equipment X-ray inspection to determine the welding effect of the internal solder ball. According to the customer's original BOM, check the special processing requirements and models of the product, confirm whether the first batch of production meets the customer's requirements, determine whether the product meets the requirements of the production technical documents, and evaluate whether the production conditions and process parameters can mass produce qualified products. The PCBA that passes the "three inspections" retains samples until the end of mass production.

4. The basis of the three inspection systems is the first one. The comparison standard of the first inspection system is the samples and guidance documents agreed in advance by the factory and the customer. The correctness of the sample includes the correctness of the material and the correctness of the welding. The consistency of the customer's guidance documents and the sample takes precedence over the document. If there is no document, the sample shall prevail. At any time, we can follow this basic principle, which is not only a protection for customers, but also a responsibility to customers. The purpose is to ensure and improve physical quality and avoid quality losses due to errors on both sides.