printed circuit board assembly

by:A-TECH      2020-03-02
Making a circuit board is a process that takes time and is not considered a \"simple thing \".
Although, there are enthusiasts who can make their own boards at home with the right materials, they are generally not as complicated as the boards made by machines.
In addition, it will be time consuming to make 20,000 PCBs by hand.
Below, I will briefly introduce you to the PCB assembly process and what is involved in each phase.
PCB assembly, also known as printed circuit board assembly, is when you weld an electronic component to a PCB or printed circuit board.
Boards that have not yet been assembled with electronic components are called PCB or printed circuit boards, and once there are welded elements on the board, they are technically called printed circuit assemblies or printed circuit board assemblies.
Keep in mind that the board assembly is not necessarily the same as the board manufacturing.
When you make a PCB, it involves multiple processes including PCB design and the actual creation of a PCB prototype.
Before the board is ready for use with an electronic device or gadget, it needs to be added by welding the correct components.
The type of component and the assembly process depend on the type of the board, the type of electronic component that needs to be connected, and what electronic device the board will be added.
Therefore, after the PCB is finished, it is time to connect various electronic components to the PCB to make it really work.
This is sometimes called a PCBA or a printed circuit board assembly.
There are two construction methods for assembly. 1)Through-
Pore Structure: Insert the Assembly lead into the hole 2)Surface-
Installation structure: The Assembly is placed on the land or pad on the outer surface of the PCB.
However, in both structural types, the Assembly leads are still fixed on the PCB in an electrical and mechanical manner with a molten metal weld.
Depending on the volume of the board that needs to be assembled, it will determine how to weld the assembly.
If it is mass production, then it is better to weld the assembly to the printed circuit board through machine placement.
Machine placement is done with bulk wave soldering or reflow oven.
Otherwise, if the production quantity is used for small batch prototypes, the manual welding effect is good in most cases (
Ball Grid Array welding by hand is actually impossible). Often, through-
Holes and surfaces
The installation structure must be carried out in a PCB assembly as some of the required electronic components can only pass through-
Hole package while others are only available on the surfacemount packages.
In addition, it is also a good reason to use both methods in the same component, because through-
Hole mounting can actually provide more strength for electronic components that may experience some physical stress.
If you know your PCB won\'t be under any physical pressure then use surface-
To take up less space on the motherboard, install the technology.
After fully building the components on the PCB, it is best to test to ensure that the board works properly and achieves the required performance.
Here are some ways to test them after assembly. 1)
A simple visual inspection to ensure that there are no inappropriate electrical components on the board.
This is also a good time to double check all welding. (power is off)2)
Analog signature analysis: when you apply current
A finite AC sine wave through two points of the electrical element and circuit. (power is off)3)
In-
Circuit test: check various physical measurements, such as voltage, frequency, etc. with the circuit board. (power is on)4)
Perform functional tests: verify that the board actually does what it wants to do. (power is on)
If some printed circuit boards fail to pass any of the above tests, not all of them are lost.
You can find out where the problem happened and replace the faulty assembly and/or the circuit board to get it through.
This is sometimes called rework.
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