How to assemble PCB

Overview: Have you found that the electronic devices in our daily life all have a common component – PCB Board. Since the birth of PCB in the 1840s, it has become the core of electronic manufacturing, and it exists in almost all electronic devices, such as TVs, mobile phones, stereos, refrigerators, etc. FS Technology will take you into the assembly world of PBC and explore how PCB is assembled? What is the use of assembling a PCB?

Concepts you need to know to learn how to assemble a pcb

PCB Board: A circuit board that does not contain electronic components and looks like a green slate with dividing lines and spaces. The PCB board itself cannot be used for work until assembly is complete.

PCBA Board: A circuit board that assembles the PCB board and electronic components together by soldering and assembling.

PCBA: Short for PCB Assembly, the purpose of which is to achieve electrical connections between components.

Electronic components: components used to assemble to pcb, including capacitors, transistors, hairsprings, springs, etc.

THT: Through-hole assembly technology, one side inserts the component leads into the through holes of the PCB board, and the other side is welded by welding techniques such as wave soldering to form electrical connections. The component body and the solder joints are distributed on both sides of the substrate respectively.

PCB SMT: Surface Mount Technology Assembly. The components are placed on the surface of the printed board, and the components are soldered to the surface of the PCB board by soldering technology to make them have specific functions.

DIP: Abbreviation for Dual Inline-pin Package. The package form used by small and medium-scale integrated circuits generally does not exceed 100 pins.

How to assemble components on PCB board

Apply solder paste: Apply an appropriate amount of solder paste to the circuit board, and place the stainless steel stencil on the circuit board accurately.

place components: The required electronic components are placed on the prepared PCB using mechanical equipment and soldered to the surface of the board.

solidified solder paste: In order to make the components more firmly attached to the board, the solder paste needs to be reflowed for a long time. (The length of time depends on different products)

Inspect the assembled PCB: After the above process is completed, the assembled PCB needs to be inspected. The specific inspection method can be viewed in the PCB assembly inspection. This chapter does not describe too much. The PCBA testing process includes the following types:

  • Manual inspection
  • AOI
  • X-ray inspection:
 

Welding: Solder components using plated through holes or PTH. (PTH: More Professional Soldering Method)

Functional test: After the soldering work is completed, the assembled PCB needs to be functionally tested to ensure that it can function properly. When the PCB signal fluctuates during the testing process, it means that the product quality is unqualified, and it is necessary to start all over again until a successful PCB is produced.

Precautions for assembling PCB boards

Uniform numbers

Before assembling the PCB, write the number on the front of the board. In order to prevent the loss of the mark, FS Technology generally writes the same mark on the side of the 96 looper. This number is permanently reserved, just like the ID card of the pcb board, and its purpose is to facilitate management.

Take it lightly

The price of the PCB board is not cheap and relatively fragile. In order to avoid damage, it must be handled with care, and the two PCB boards should be isolated or placed back-to-back.

Operate with gloves、

This is a way of protecting components. The human body will generate static electricity and cause damage to the components, so it is necessary to take necessary measures.

Clear circuit boards in time

  • Use a professional PCB brush and cleaning solution to clean the surface of the board. If you use cotton balls, which are easy to lose hair, you need to pay attention to remove the remaining cotton wool.
  • Remove redundant pins
  • The front flying line should be concealed as much as possible, and the back flying line should take shortcuts in principle
  • The redundant device should be completely cut off.
  • Check all kinds of screws and keep them tight.

The above is all about “how to assembly pcb board”, if you need to learn more PCBA knowledge, please pay attention to the PCBA blog.

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