Long PCB for LED lighting

Conformal coatings are widely used in PCBA applications, particularly in harsh environments with extreme temperature and humidity. These coatings provide excellent insulation, moisture-proofing, anti-vibration, dust-proofing, corrosion resistance, and more. This helps extend the life of the PCBA and protect it from external corrosion and contaminants. The conformal coating can be applied using either a brush or a spray method. The typical process involves coating side A, surface drying, coating side B, and curing at room temperature. The recommended coating thickness ranges from 0.1mm to 0.3mm, and all operations should be performed at temperatures above 16℃ and relative humidity below 75%.

After reflow soldering, it is crucial to inspect for missing components, correct placement, short circuits, and pseudo soldering. While the first three issues are easy to identify, pseudo soldering is more complex, often caused by insufficient solder, poor wetting, or defects in the pad design, PCB oxidation, or component quality. Pseudo soldering can be identified using online testers, visual inspection, or microscopes, and should be addressed immediately to prevent hidden defects. Causes include poor pad design, oxidized PCBs, insufficient solder paste, and defective components (e.g., oxidized or deformed). Solutions involve correcting pad design, cleaning or drying the PCB, replenishing solder, and ensuring component quality.

Rout Rules:When specifying a board edge, please ensure that if you are designing in Autotrax, Circuit Maker or Protel that the board edge is defined in Mechanical 1 layer.If you are panelizing your boards please ensure that there is a minimum of 100mil between board edges to allow for the router

The PCB industry, despite being technology- and capital-intensive, remains labor-intensive due to manual processes and pipeline operations, often requiring thousands of employees. The introduction of industrial robots into the PCB manufacturing process brings significant advantages, such as reducing labor costs, improving operational accuracy, enhancing product quality, and improving worker safety by minimizing exposure to hazardous chemicals and repetitive tasks. Robots also allow for 24/7 operation, greater production flexibility for small orders, and reduced material consumption through precision handling. In the long run, robot automation enhances the brand image, product quality, and competitiveness of PCB manufacturers.

SYS Tech has previously introduced shielding die wave soldering and through-hole reflow soldering for PCBA through-hole soldering processes. The immersion soldering process, which allows the soldering of joints ranging from 0.7mm to 10mm, is ideal for short pins and small pads, offering stable performance with reduced risk of bridging. When using immersion soldering, it is recommended to maintain over 5mm distance between adjacent solder joints, devices, and soldering tips. Key parameter settings include a soldering temperature of 275℃–300℃, an immersion speed of 20mm/s–25mm/s, an immersion time of 1–3 seconds, and a post-immersion speed of 2mm/s. The shock pump rate is determined by the number of welding nozzles.

FR-4 Copper Clad Laminate (CCL) materials are categorized into various levels based on quality and application. The A1 level CCL is designed for high-performance applications such as military, communications, and automotive circuits, meeting world-class standards. A2 level CCL is cost-effective, suitable for general computers, instruments, and advanced electronic products, offering balanced quality and competitiveness. A3 grade CCL is used in household appliances, computer peripherals, and general electronics, providing a competitive price for mass-market products. A4 grade is a low-end CCL material, still meeting performance needs for everyday electronics, with the highest cost-efficiency. Class B CCL, the most affordable, has poor quality stability, limiting its use to smaller circuit boards (less than 100mmx200mm) due to size instability.