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What is the first three inspection system for PCBA processed products? Let me explain to you what is the first three inspection system for PCBA processing products!
The first piece is the first piece or part of the product that will be produced for batch PCBA processing. First article inspection is to inspect and confirm the first product. The first three inspection system is the self-inspection, mutual inspection and special inspection of the first PCBA processed product.
1. What is the first three inspection system
Self-inspection, production and operation employees conduct self-inspection on the products produced by their own workstations, and conduct self-confirmation by comparing work instructions, samples, etc., and immediately notify the production engineer to resolve any objections.
Mutual inspection, the inspection of the products produced by each section chief is also confirmed by comparing the work instructions, samples, etc., and immediately notify the production engineer to resolve any objections.
Special inspection, in-line inspection inspect the product according to the customer’s original BOM, special processing requirements, sample parts, etc., confirm whether the first product produced meets customer requirements, determine whether the product meets the requirements of the production technical documents, and at the same time check the production conditions and Evaluate whether the process parameters can mass produce qualified products. The PCBA samples that have passed the "three inspections" are retained until the end of batch production.
The basis of the three inspection system is the first piece, and the comparison standard of the first piece is the sample and guidance document agreed upon in advance by the agent and the agent. The correctness of the sample includes the correctness of the material, the correctness of the welding and the correctness of the electrical properties. For the consistency of customer guidance documents and samples, the documents shall take precedence. If there is no document, the samples shall prevail. At any time, everyone must follow this basic principle. This is a protection for the foundry and a responsibility for the customers. The purpose is to ensure and improve the quality of the goods, and avoid the occurrence of quality losses caused by the mistakes of both parties.
2. Precautions for the first three inspection system
(1) The first article inspection is carried out on the first to third PCBA products manufactured at the beginning of production (work or shift) or after adjustment of process factors (personal replacement, material change, job change, tooling change, equipment adjustment, etc.) test. The purpose is to discover the system factors that affect product quality in the process as early as possible, and prevent products from being scrapped in batches.
(2) The first article inspection is carried out jointly by the operator, non-operator, and inspector. Operators first conduct self-inspection, non-operators conduct mutual inspection, and then send them to inspectors for special inspection after they are qualified. In order to save time, mutual inspection and special inspection can also be carried out at the same time.
(3) The inspector shall mark the first piece that has passed the inspection as required and keep it until the batch of products is completed.
(4) If the first piece has not passed the inspection, no further processing or operation is allowed.
(5) The first article inspection must be timely to avoid reducing production efficiency.
3. The control requirements of the first three inspection system
(1) Whether the provisions of technical documents such as product drawings, process documents, BOM, and special processing requirements are harmonized and unified.
(2) Whether the parameters, position, polarity, angle, etc. of the mounted components meet the requirements of the technical documents.
(3) Whether the quality of raw materials is qualified (welder color, component appearance, positive and negative poles, etc.).
(4) Whether the operating workers strictly follow the design drawings, technical standards, and process documents.
(5) Whether the welding or curing quality of the product meets the requirements of relevant technical documents.
4. Identification and records
The first piece that has passed the "three inspections" will be marked by the inspector and stored on the product until the entire batch is processed and transferred to the next process. The purpose of identification and preservation is to be able to trace whether the first "three inspections" and the first "three inspections" have been missed when there are quality problems in the whole batch.
All personnel participating in the first "three inspections" should sign on the "first inspection form", and the signatures should be neat and complete to preserve the traceability of product quality.
In PCBA processing, the implementation of the first three inspection system can not only ensure the quality of processing, but also improve production efficiency and reduce rework. There is no shortcut to quality.
