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What causes pcb short circuit
- At the design level, the line spacing is too small, the hole design is improper, and the wiring conflict is easy to bury the hidden danger of short circuit.
- In terms of manufacturing process, incomplete etching, welding resistance layer defects, and lamination offset will cause abnormal line conduction.
- External factors include foreign body pollution, mechanical damage and adverse environmental effects, damage to line insulation and short-circuit.
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How to solve plate warping deformation
- Optimize the laminating process: precisely control the temperature, pressure and time of the laminating process. The rate of heating and cooling should not be too fast to prevent uneven thermal expansion and contraction of each part of the plate. The pressure should be uniform and appropriate to avoid excessive pressure to extrude the sheet, and the time setting should ensure that the resin is fully cured.
- Choose the right material: Choose a substrate material with reliable quality, low thermal expansion coefficient and uniformity, such as some high performance glass fiber reinforced epoxy resin boards. At the same time, ensure that the properties of the semi-cured sheet and the substrate material match to reduce the stress concentration caused by material differences.
- Increase production assistance measures: During the production process, the plate is properly supported and fixed, such as the use of pallets or fixtures. When cutting and handling, handle lightly to prevent deformation caused by external forces. In addition, the copper foil and line can be rationally arranged in the design stage to balance the stress in each area of the plate
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Question：How do you test and control the qualityAnswer： Our Quality Assuring Procedures as below,
* Visual Inspection
* Flying probe, fixture tool
* Impedance control
* Solder-ability detection
* Digital metallograghic microscope
* AOI (Automated Optical Inspection)
