How to check pcb assembly board is qualified

- Jan 24, 2018-

Before pcb assembly board shipping, how to determine whether qualified,is a very important part. So how to test it?Now for your reference,I will analyze from several aspects.

1, The required inspection files and tools are: bomlist, pick and place files, magnifying glass (electronic or optical), tape measure,test fixture.QA sampling standards: the implementation of GB / T2828.1-2003II level inspection sampling plan.AQL value: CR: 0MAJ: 0.25MIN: 0.65 Requirements for testing environment: Indoor temperature and humidity: Temperature is 25 ± 3 , humidity is 40-70%,this is very important, you can use air conditioners to achieve. The choice of light source,using fluorescent lamp(color rendering index of 80 best) or table lamp.The product to be seized 30-50cm from the inspector for the appearance of judgment.

 

2,The specific test method is:first of all, we check the appearance of solder point, silk screen, component surface and so on.

Component polarity and the direction of PCB board silk screen must be the same, this is the most basic requirements.If over sampling standards, it will request rejection.Check the amount of tin should be noted that the maximum height of solder joints can exceed the PCB board, but can not touch the component body to prevent short circuit.At the same time,To have a gap, if you touch the top of the component body are unqualified range.Too much solder can also lead to fake welds. Component pins and Pcb board between the solder joints to be full, flat lead components, no tilt, the cutting height of components to be consistent.Component welding point, there must be no vacuum welding.Solder tin into a semi-circular surface of the gloss, matte, indicating that the tin content is not enough. On the contrary, there is a residual solder paste on the solder ball, the appearance and irregularity of the tin, and any unmelted tin powder tin slag found.These are all bad situation.

 

3,Place components correct, can not have the wrong parts, one by one corresponding sampling.Check the PCB board, components and PCB board can not appear between the cracks or gaps, crack components, nicks or components of any damage are not allowed.

 

4,Second, test the basic electrical performance as much as possible, using a test stand to test electrical performance. If it is more expensive PCBA board, but also requires professional engineers and equipment testing, to be foolproof.

 

Della Zhang

Email: zx@pcb-smt.net

Tel: +8675526978081

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