Solder paste inspection (SPI) is a critical step in the SMT assembly process for ensuring soldering quality. This article provides a detailed analysis of how SPI technology monitors solder paste printing quality through high-precision 3D measurement, a rigorous inspection standard system, and a systematic operational process. It also offers professional solutions for five common issues. The article further explains the application characteristics of SPI in various electronic manufacturing fields, highlighting the core value of this technology in quality assurance and process optimization.

This article provides a detailed analysis of the factors influencing PCB delivery cycles, including design complexity, raw material supply, production processes, equipment capabilities, order priority, and quality control. Delivery times for PCBs of different layer counts (e.g., 2-layer, 4-layer, 6-layer, and above) range from 2 days to 20 days, with urgent orders able to be expedited to 24–72 hours. As a professional PCB manufacturer, Topfast leverages advanced equipment, rigorous testing, and efficient service to help customers optimize production cycles, reduce costs, and enhance market competitiveness.

This article provides a detailed overview of Topfast’s professional PCB comprehensive testing system, covering three key stages: bare board testing, PCBA assembly testing, and reliability verification. The article explains the application and value of advanced testing technologies such as AOI, SPI, AXI, and ICT, demonstrating Topfast’s commitment to ensuring product quality through its testing capabilities. This article is suitable for engineers and procurement personnel interested in PCB reliability.

Topfast, a leading PCB manufacturer with 17 years of industry experience, specializes in high-precision circuit board design, production, and assembly services, serving clients such as Huawei, DJI, and Mitsubishi. The company operates a modern 20,000㎡ factory with over 1,000 professional staff, achieving a monthly production capacity of 100,000㎡. It offers a full range of solutions from HDI boards, high-frequency/high-speed boards to rigid-flex boards, with all products certified to UL, ROHS, and ISO9001 standards. With state-of-the-art equipment such as laser drilling and AOI/X-RAY full inspection, coupled with a team of seasoned technical experts, Topfast achieves the industry’s fastest turnaround times—12 hours for 2-layer boards and 96 hours for 12-layer boards—while also offering BOM cost optimization and 24/7 full-cycle service.