PCBA for non-contact infrared thermometer
  • Hot-air solder leveling
    April 09, 2021 Hot-air solder leveling
    A process in which lead-tin solder is applied (melted) on the surface of the PCB, and the lead-tin solder is blown flat with heated compressed air. (In the dynamic environment of high temperature and high pressure, the PCB is immersed in the lead-tin solder (melted), and the air knife will flatten the liquid solder on the copper surface) The hot air leveling process is relatively dirty, smells bad, and is relatively dangerous, and the technical control is relatively complicated. If the flatness is not good, it will affect the welding quality of the components. With the advancement of technology, a hot air leveling process suitable for assembling QFP and BGA with a smaller pitch has also emerged. In actual applications, OSP and ENIG are both selected. At present, in PCB surface treatment, 20% -40% will use hot air leveling, let us understand its advantages and disadvantages together. (1). Function: The lead-tin solder (melted) forms a layer of anti-copper oxidation coating, slows the oxidation of copper, and forms a copper-tin metal compound (about 1 to 2 mils in thickness) at the junction with copper, providing good solder-ability. (2). Advantages and disadvantages of hot air leveling: Advantage: a) Low cost, good solder-ability b) Avoid corrosion disconnection on the printed board Disadvantages: a) Poor surface flatness b) The PCB is prone to warp due to large thermal shock. (3). General process Micro-etching→preheating→coating flux→spraying tin→cleaning. Tin spray is divided into lead-free spray tin (lead content less than 0.1) and lead spray tin (lead content 37%), the difference between them:   Lead-free Lead Cost low lower(relative to lead-free) Mechanical strength medium High (relative to lead-free) Brightness dim bright (relative to lead-free) RoHS can pass Can’t pass
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  • How to inspect PCBA incoming materials?
    March 25, 2021 How to inspect PCBA incoming materials?
    The empty PCB board assembles various electronic components on the circuit board through SMT, and then forms PCBA through DIP plug-in. Among them, the incoming components are in the SMT inspection process. We need to check whether the labels and model specifications of the incoming materials are consistent. Use a magnifying glass to check whether the physical model specifications and silk-screen logos are consistent. Check the structure and shape after the model and silk-screen are no problem. It is consistent with the drawings and samples in the acknowledgment. Refer to the drawings and use a vernier to measure the size of the chip capacitors to meet the requirements. We need to use a digital bridge (LCR METER) tester to select DCR for testing. The capacity should be within the required range when measuring the capacity, and the loss value should be recorded while measuring the capacity, and the value should be within the required range. After passing the above inspections, the chip capacitors can be placed in the machine for placement, the components are soldered on the PCB board through the placement machine (SMT), manual welding (DIP, AI) and other equipment methods. A wide variety of chip capacitors is just one of them. It is a component that can store charges, and the same component has different dielectric specifications, and different specifications have different characteristics and uses. There are also diodes, tertiary tubes, and stickers. Chip resistors, various IC chips, relays, transformers, etc., they play their due role on the PCBA. If you want to know more about the detailed inspection standards of PCBA components, please call us: +86 0755 2322 6243 EXT 801. info@xlpcba.com+86 0755-2322 6243 EXT
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  • The Computer Motherboard PCB Assemble
    June 05, 2020 The Computer Motherboard PCB Assemble
    How do we assemble the computer motherboard PCB? Put the produced PCB on the SMT automated production line, put a steel mesh on the automatic paste brushing machine, after the automatic paste brushing machine, it will brush a layer of solder paste on the corresponding position of the computer motherboard PCB, high-speed machine (similar to Intelligent robot) Assemble rice-sized capacitors and resistors on the computer motherboard PCB. The general-purpose machine attaches IO sound card chips, network card chips, power management chips, south bridge, north bridge chips, field effect transistors and other components to the PCB, although it is There are robots, but there will still be skilled operators operating and checking on the line. QC strictly supervises and checks the quality in accordance with the ISO9001 standard to ensure that the components will not be installed incorrectly or missed or installed incorrectly, and flow into the reflow furnace. This process will solder all the previously attached components. After that, it will be inspected by automatic optical inspection machine (AOI) and ICT, mainly for appearance inspection. Whether the stickers are reversed or crooked, the pictures taken are checked against the database to ensure that each component is completely correct. Whether the circuit function is normal. The inspected qualified products will be sent to the DIP production workshop. The DIP production line is filled with fixtures. This is used to fix the computer motherboard PCBA. Skilled operators will install relatively large memory slots, PCI slots, and AGPs on it. Slots, various interfaces, audio connectors and other components, after completion, perform ICT testing (can the motherboard be lit, whether the function is normal), we also call FQC testing, if it is a qualified product, it can be packed in an anti-static bag. Packaging standard: the keyboard and mouse interface is facing right, and the sealing is to the welding surface. Put it in the box together with the accessories, and the box will be pulled to the warehouse. If it fails, it will be repaired or scrapped directly. Please give us the authorization letter before signing the PCBA contract for manufacturing computer motherboards. We will strictly follow the quality requirements and manufacturing standards specified in the contract to manufacture and deliver on time. If you want to know more about the PCB manufacturing and assembly services provided by Xianglong (Shenzhen) Electronic Technology Co., Ltd. for computer motherboard PCBA and computer peripheral products, please call +86 0755 2322 6243 EXT 801. You can also email your specifications to info@xlpcba.com
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  • FPC Market Prospects And Trends
    August 28, 2020 FPC Market Prospects And Trends
    Flexible printed circuit boards have the characteristics of light weight and thin thickness. Compared with rigid printed circuit boards, it can save up to 60% of space and weight. In addition, the benefits provided in terms of durability and cost further expand their adoption rates in different end-use industries. At present, FPC has been widely used in mobile smart terminals such as smart phones, tablet computers, and wearable devices. It is the only solution to meet the needs of miniaturization and convenient movement of electronic products. In recent years, the flexible PCB market technology has undergone major changes from the traditional single-sided flexible circuit to the advanced multilayer flexible circuit board. The rise of rigid-flex circuit technology is creating great potential in various telecommunications and medical applications, and driving the demand for flexible PCB technology. In the flexible PCB market, various technologies such as single-sided, double-sided, multilayer and rigid flexible circuits are used in various applications. The growing demand for FPC in the telecommunications industry, the growth of connected devices and the advancement of automotive electronics technology have created new opportunities for various flexible PCB technologies.
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  • What is PCB?
    October 08, 2020 What is PCB?
    PCB, as the "mother of electronic products", is a bridge that carries electronic components and connects circuits. It is widely used in communications, consumer electronics, computers, automotive electronics, industrial control, medical equipment, national defense, aerospace and other fields. It is a modern electronics indispensable electronic components in information products. It is a provider of electrical connections for electronic components. The downstream of the PCB industry covers almost all electrical circuit products, and the core applications with the largest output value include communication equipment, computers, consumer electronics and automotive electronics. With the development of electrification and automation in human society, the application range of PCB is becoming wider and wider, and there are no other substitutes for the time being. 1. Classification according to the strength of PCB substrate (1) Rigid printed boards Printed boards made of rigid substrates; (2) Flexible printed boards Printed boards made of flexible substrates, also known as flexible printed boards; (3) Rigid and flexible printed boards are printed boards made by using flexible substrates and combining them with rigid substrates in different areas. 2. Classification according to the method of making conductive patterns on PCB circuit boards (1) Subtractive PCB Printed circuit boards made by subtractive technology; (2)Additive PCB Printed circuit boards produced by the additive process. 3. According to the PCB circuit board substrate classification (1)Organic printed boards. Conventional printed boards are all organic printed boards, which are mainly composed of three materials: resin, reinforcing materials and copper foil. Resin materials include phenolic resin, epoxy resin, polyimide, /A resin, etc.; (2)Inorganic printed boards are commonly referred to as thick film circuits, which are composed of ceramics, metal aluminum and other materials. Inorganic printed boards are widely used in high-frequency electronic instruments. 4. Classification according to the conductive structure of the PCB circuit board (1)Single-sided printed circuit board refers to a printed circuit board with conductive patterns on only one side. Because the wires only appear on one side, this kind of printed circuit board is called a single-sided printed circuit board. (Referred to as single panel) (2)A printed board with conductive patterns on both sides of the double-sided printed board, because the area of the double-sided board is twice as large as that of the single-sided board, and the wiring can be staggered (it can be wound to the other side), which is more suitable for more complex On the circuit. (3)Multi-layer printed board A printed board made of 3 or more layers of conductive patterns and insulating materials alternately bonded together and laminated, referred to as a multilayer board, requires the conductive patterns between layers to be connected to each other as needed...
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  • 5G PCB Has Fully Exploded And Ushered in New Growth Momentum
    January 15, 2021 5G PCB Has Fully Exploded And Ushered in New Growth Momentum
    PCB refers to a printed board on a general base material that forms connection between points and printed components according to a predetermined design. Its main function is to make various electronic components form a predetermined circuit connection, which plays a role of relay transmission and is an important electronic component. It is the support of electronic components and the carrier of electrical connection of electronic components. With the iteration of 5G technology, the product structure of PCBs has also differentiated. Multilayer boards still occupy the mainstream position in the PCB market. With the rapid development of electronic circuit industry technology, the integrated functions of components are becoming more and more extensive, and electronic products have more high-density requirements for PCBs. In order to highlight, high-end PCB products such as high-multilayer boards, flexible boards, HDI boards and packaging substrates have gradually occupied a leading position in the market. With the development of electrification and automation in human society, the desire for mobile devices and progressive "smart" digitization will further increase, and the application range of PCBs will become more and more extensive, and at the same time, it will bring new momentum to the PCB industry. The downstream of the PCB industry covers almost all electrical circuit products, and the core application areas include communication equipment, computers, consumer electronics and automotive electronics. At present, the communications field is the largest downstream of PCB, and the communications market accounts for about one-fifth of the global output of electronic products, which includes mobile and fixed devices and their infrastructure. In particular, mobile devices have driven the demand for rigid, flexible and flexible substrates. PCBs are mainly used in the communication field in transmission networks, wireless networks, data communications, and fixed broadband equipment. The 5G base station is characterized by high frequency and high speed, which requires the use of millimeter waves with higher frequencies and wider bandwidths. Band (frequency from 30GHz to 300GHz). Because millimeter waves belong to the extremely high frequency range, the transmission characteristics of electromagnetic waves are that the higher the frequency, the shorter the wavelength, the weaker the diffraction ability, and the stronger the penetration ability. However, the signal penetration process will lose a lot of energy, which leads to the shorter the transmission distance. To solve the problem of serious signal attenuation, the only way to increase the number of 5G base stations is to increase the number of 5G base stations and 5G electronic equipment. The increase in 5G base stations and 5G electronic equipment has led to a sharp increase in PCB demand, which will bring broad market space to PCB and strongly promote the rapid development of the PCB industry. 5G h...
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  • What is PCBA?
    October 28, 2019 What is PCBA?
    PCBA is the abbreviation of Printed Circuit Board Assembly, that is to say, PCB empty board, after SMT loading, or the entire manufacturing process of DIP plug-in, referred to as PCBA. SMT (Surface Mount Technology): The main use of the placement machine is to mount some micro-small parts on the PCB. The production process is: PCB board positioning, printing solder paste, placement machine placement, reflow oven and finished inspection. SMT is very sensitive to positioning and the size of parts during integration. In addition, the quality of solder paste and printing quality also play a key role. DIP stands for "plug-in": Inserting parts on the PCB board, due to the large size of the parts and not suitable for mounting SMT or the manufacturer's production process cannot use SMT technology to integrate parts in the form of plug-ins. At present, there are two implementation methods of manual plug-in and robot plug-in in the industry. The main production process is: sticking adhesive (to prevent solder paste from plating where it shouldn’t be), plug-in, inspection, wave soldering, brushing (removed in the past) Stains left in the process of the furnace) and made inspection.
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