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PCBA processing needs to undergo aging test, which can be repeated on and off, simulated function operation, load operation, etc., to check the stability of the equipment; in addition, pay attention to wearing anti-static gloves, use the meter to be reliably grounded, and the work surface should be covered with anti-static in advance Rubber pad. Next, I will introduce the details for you.
1. PCBA processing reliability test
1. Aging
Place the PCBA board with OK test function under specific temperature and humidity conditions, perform repeated power on and off,
simulation function operation, load operation, etc., and check the stability of the PCBA board through 24 to 72 hours of continuous work. Because the aging test takes a long time, it does not have the possibility of large-scale batch operation. In the actual process, the aging test is only a sample test, and the overall yield rate of this batch of products is judged by the qualified rate of the random test.
2. Vibration test
When many PCBA boards are delivered to customers, there are often some problems caused by vibration during transportation, such as component shedding and pad cracks. Through the vibration test, the vibration effect during transportation can be effectively simulated in the laboratory, and the hidden dangers in the welding process are gradually exposed. In this way, batch welding defects are avoided to the greatest extent, and the overall yield rate of delivery is improved. At present, there are professional simulated motion vibration workbenches on the market, and the price is not high, you can purchase one for 5,000 yuan.
3. Surge impact test
In the process of PCBA processing, it is often OK to work under normal voltage, but occasional defects in a certain surge. Many circuit designs are not perfect. They often fail to consider the fatal impact of instantaneous voltage or current impact on the entire circuit. This requires us to conduct sampling surge impact experiments before the mass production of PCBA.
Two, PCBA processing precautions
1. Warehouse personnel wear anti-static gloves when distributing materials and testing IQC, use the meter to be grounded reliably, and lay anti-static rubber pads on the work surface in advance.
2. In the process of operation, use anti-static work surface, and use anti-static container to hold components and semi-finished products. Department welding equipment can be grounded. Electric soldering iron must be anti-static type. All equipment must be tested before use.
3. When the PCBA is processed through the furnace, because the pins of the plug-in components are washed by the tin flow, some plug-in components will be tilted after the furnace is soldered, causing the component body to exceed the silk screen frame, so the repair welding personnel after the tin furnace are required to perform it. Correct appropriately.
4. When PCBA is soldering speakers and batteries, please pay attention to the solder joints not to be too much tin, and not to cause short-circuit or fall off of peripheral components.
5. PCBA substrates must be placed neatly, bare boards cannot be stacked directly, and electrostatic bags must be used for stacking.
