PCB Tech - PCBA inspection standards and applications

PCBA inspection standards and applications

The PCBA processing supply chain is extremely long. From component procurement, circuit board production, chip processing, plug-in, program firing, PCBA testing and packaging logistics, the quality inspection standards have always been a problem for PCBA processing manufacturers. Everyone in the industry knows the IPC electronic acceptance standard IPC-A-610E. In this manual, there are detailed chapters on the PCBA standards before they leave the factory, but for ordinary factories, it is difficult to comply with them one by one, because the implementation of too large, complete, detailed and complicated standards will cause great The labor cost is also a challenge for production efficiency.

In view of this, there are many PCBA inspection standards. We only need to carefully grasp a few of the main links to achieve quality control on the basis of ensuring efficient production and operation.

1. ICT or functional test passed the standard

The ultimate goal of PCBA inspection is to pass the inspection of each PCBA board before leaving the factory. The most commonly used is ICT circuit inspection. As long as a very simple ICT test frame is made, 100% of the PCBA boards produced can be inspected. The PCBA board that has passed the ICT test is regarded as part of the finished product with a 90% probability.

2. Appearance standard

Each PCBA processing plant has an OQA factory inspection post to perform visual inspection of the PCBA board before leaving the factory (partially assist some professional instruments) to ensure that there are no obvious reliability problems, such as insufficient tin thickness, partial damage to components, etc.

3. Aging standards

In order to ensure strict PCBA board inspection standards, it is necessary to conduct random inspections and aging tests on PCBA boards. Generally speaking, it is frequent power-on and power-off or long-term power-on operation (based on PCBA board firing procedures). In addition, you can also use professional instruments to detect electromagnetic compatibility, power/voltage input and output signal stability, etc. This test takes a lot of time and can only be partially tested. Of course, at the request of the customer, sufficient cooperation is also required.

The application of PCBA inspection standards in IPC is an important reference for our quality positions. In many cases, the standards are far lower than customer requirements. In actual production, the craftsmen of PCBA processing plants must adapt to the current conditions, give full play to their experience, and use flexible and strict standards to ensure the straight-through rate of PCBA boards.

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