Tombstone defects on PCBs, also known as the Manhattan Bridge or bridge effect, are a type of assembly defect for surface-mounted (passive) components. This defect occurs due to inconsistent melting times of solder paste at both ends of the component, leading to uneven stress on the component. Given that these components are relatively light, they … Read more
1. Concept of PCB PCB (Printed Circuit Board), known in Chinese as 印制电路板, is an important electronic component that serves as a support for electronic components and provides electrical connections between them. It is called a “printed” circuit board because it is made using electronic printing technology. 2. Role and Function of PCB in Various … Read more
SMT Top Networking Circle A professional circle for sharing networking resources and achieving career advancement. New Platform 2020 1. Purpose The total cost of a product is determined by 60% from the initial design; 75% of manufacturing costs depend on design specifications and guidelines; and 70-80% of production defects are caused by design issues. Therefore, … Read more
Real-time Temperature Monitoring Intelligent System – PIS As the world's largest electronic manufacturing base, looking back over the 40 years of reform and opening up, we can clearly distinguish the evolution of the domestic electronic manufacturing industry from nothing to something, from small to large, from ordinary to specialized, transitioning from labor-intensive to technology-intensive, and … Read more
Introduction: The conformal coating of PCBA (Printed Circuit Board Assembly) is an important part of the three-proof technology for military electronic equipment. Its purpose is to further enhance the resistance of the circuit board to adverse environmental effects during storage and operation, and to improve the mechanical performance of components against shock and vibration, achieving … Read more
1. Purpose: To provide a basis for the appearance inspection of PCBA products produced at our SMT station. In cases where the specific appearance standards conflict with customer requirements, customer requirements shall prevail in principle. 2. Scope: This standard references IPC-610D (for dedicated service electronic products) PCBA appearance inspection standards and is applicable only to … Read more
1. What Are the Inspection Standards for PCBA Boards? First, let us understand the introduction of quality inspection standards: 1. Critical Defects (denoted as CR): Any defect that can cause harm to humans or machines or endanger life safety, such as non-compliance with safety regulations, burning machines, electric shock, etc. 2. Major Defects (denoted as … Read more
SMT stands for Surface Mount Technology, which is currently the most popular technology and process in the electronic assembly industry. It is a circuit assembly technology that mounts surface-mounted components (referred to as SMC/SMD, known in Chinese as chip components) on the surface of printed circuit boards (PCBs) or other substrates, using methods such as … Read more
Polarity components require special attention throughout the PCBA processing, as incorrect orientation can lead to mass failures and the complete failure of the PCBA board. Therefore, it is crucial for engineering and production personnel to understand SMT polarity components. 1. Definition of Polarity Polarity refers to the positive and negative terminals of a component or … Read more
In the SMT (Surface Mount Technology) production line, the birth of each circuit board is a game of precision and efficiency. From solder paste printing to component placement, and then to soldering and curing, even the slightest flaw in any link can trigger a “butterfly effect”—leading to unstable product performance at best, or mass rework … Read more