PCB board basic detection of 9 little common sense It is time to pay attention to some details in the detection of PCB board, so as to better prepare to ensure product quality. When detecting PCB board, we should pay attention to the following 9 common sense. 1. It is strictly …
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Classification and selection of PCB materials 1. The FR-4 we often choose is not a material name What we often refer to is “FR-4” is the code name of a kind of flame-resistant material grade. It represents a material specification that the resin material must be able to extinguish by itself after burning. It is …
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Experience sharing of BGA assembly process (1) The viscosity of the flux is very important. Too high will affect the coating and transfer; if it is too low, it will affect the amount of coating. Generally, the viscosity should be selected in the range of (25000±5000)cp. (2) The thickness of the flux is 60% of …
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What are the possible problems in PCBA substrate production? 1. Various soldering problems Blast holes in cold solder joints or tin solder joints Inspection Method: Before and after dipping soldering, the holes are frequently analyzed to find the places where the copper is stressed. In addition, the raw materials are inspected for incoming materials. possible …
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What are the anti-interference design measures for PCB circuits? 1. Power cord design According to the size of the printed circuit board current, try to increase the width of the power line to reduce the loop resistance. At the same time, make the direction of the power line and the ground line consistent with the …
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What factors affect solder paste printing in PCBA processing? Solder paste printing is very important for PCBA. It directly affects the overall soldering effect of PCBA. In the process of PCBA processing, how to do solder paste printing has become a problem that must be considered by production managers. The effect of solder paste printing …
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What are the characteristics of SMT surface assembly? As a new generation of assembly technology, SMT technology has only a history of more than 40 years, but this technology has fully demonstrated its strong vitality when it was born. It has completed the journey from birth, perfection to maturity at an extraordinary speed. Entered the …
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What are the specific steps for PCB copying? The technical realization process of PCB copy board is simply to scan the circuit board to be copied, record the detailed component location, and then remove the components to make the bill of materials (BOM) and arrange the material purchase, and the empty board is The scanned …
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What are the operating procedures and precautions for SMT high-speed placement machines? In general, a placement machine with a theoretical placement speed of 30 000 to 60 000 pieces/h per hour is called a high-speed placement machine, which is mainly used for placement of small chip components and small integrated components. However, during the operation …
How to solve the problem of the online splitter of the PCB circuit board? Any long signal path on the printed circuit board of an online splitter can be regarded as a transmission line. If the line propagation delay time is a much shorter rise time signal, then the rise of the signal generation reflects …
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Reasons and solutions for bridging during PCBA production and processing! When we process PCBA, we will encounter various problems. Bridge is one of the common defects in PCBA processing. It will cause short circuit between components and must be repaired when the bridge is encountered. 1. Solder paste quality issues The metal content in the …
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What are the hot pressing and flattening methods for warped PCB board arch molds? According to the mechanical properties of polymer materials and years of work practice, this article recommends the arc-shaped mold hot-pressing and leveling method. According to the area of the PCB board to be leveled, make several very simple bow-shaped molds. Here …
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