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How to guarantee the quality of round hole exhaust
How should we ensure the quality of patch and strip arrangement with technology? How much do you know about patch arrangement? So today xiaobian to give you a detailed introduction, the following is about how to ensure the quality of the placement of the placement of the parent can be used to ensure the quality of the placement of the technology, specifically the following points:
1. Anti-static measures should be taken in the assembly factory of electronic display screens for anti-static needles and exhaust bus.
2. Heat Dissipation Design The exhaust pin and exhaust bus will get hot when working. Excessive temperature will affect the attenuation speed and stability of LED, so the heat dissipation design of PCB board and the ventilation and heat dissipation design of box will affect the performance of LED.
3. Design current value The nominal current of the patch bus is 20mA, and it is generally recommended that the maximum current should not exceed 80% of the nominal value. Especially for the display screen with small point spacing, the current value should be reduced due to poor cooling conditions.
4. The temperature and time of wave-front welding must be strictly controlled. The preheating temperature is 100 ° C ±5 ° C, the highest temperature is not more than 120 ° C, and the preheating temperature rise is required to be stable. The welding temperature is 245 ° C ±5 ° C, and the welding time is recommended to be no more than 3 seconds.
5. Control the perpendicularity of the lamp. For the inline needle bar, there should be enough technology to ensure that the LED is perpendicular to the PCB board when it goes through the furnace.