PCB Technical - The purpose of pcb assembly to be tested

The purpose of PCB assembly to be tested
Why do we need to test PCB assembly, can't we not do it? The following will explain the purpose of testing for PCB assembly, please see the specific content below.

one. In order to improve product qualification rate
As the qualified rate of products increases, the pass rate of products will greatly increase.PCB assembly inspection is a link in the entire production process of PCB assembly processing, and is an important means of controlling product quality.

two. In order to get a better user experience
If conditions permit, every product needs basic tests, such as ICT and FCT tests, as well as some tests, such as fatigue tests, stress tests in harsh environments, aging tests, and products that can only be sampled. Our hearts will have a bottom. Only products that can stand the test will be liked by users. If problems are found in the testing process, we can also make corrections and adjustments in time to make the entire product more complete and avoid serious consequences after the product goes on the market.

3. PCB assembly circuit board inspection conditions
1. In order to prevent the parts from being contaminated, you must choose EOS/ESD full protective gloves or finger cots and wear an electrostatic ring. The light source is white or fluorescent. The light intensity must be above 100 lux, and it can be clearly analyzed and visible within 10 seconds.
2. Inspection method: place the product about 40cm away from the eye, about 45 degrees up and down, and inspect it visually or with a three-fold magnifying glass.
3. Inspection standard: (according to QS9000 level? Sampling=0 AQL=0.4%; as a special customer's requirement, it is determined according to the customer's acceptance standard)
4. Sampling plan: MIL-STD-105 E2 standard single sampling
5. Judgment and inspection standard: Critical Defects (CR) AQL 0%
6. Major defect (MA) AQL 0.4%
7. Minor defect (MI) AQL 0.65%

Four. PCB assembly board inspection standards
1. Serious defects (indicated by CR): Any defect that is sufficient to cause harm to people or machines or endanger life safety, such as non-compliance with safety regulations/burning of the machine/electric shock.
2. Main shortcomings (indicated by MA): The shortcomings that may cause product damage, malfunction or affect the service life of the product due to material reasons.
3. Minor defects (indicated by MI): does not affect the product function and service life, the appearance is defective, and the mechanism assembly has minor defects or differences.

In summary, the purpose of our PCB assembly inspection is to improve the pass rate of the product and to obtain a better user experience. In addition, the editor also introduced the PCBA circuit board inspection conditions and PCBA board inspection standards. This is the whole content of the purpose of the PCB assembly to be tested. Thank you for reading.