How to quickly distinguish the number of PCB boards on the motherboard

In the process of PCB copying board, we often encounter problems to copy a multi-layer PCB board, so how to develop and rapidly improve the number of PCB board layers? 1oz vs 2oz

In order to facilitate the analysis and understanding of the enterprise, we first need to understand and learn the basic work of the PCB board: these travel routes are called wires or wiring, and are used to study the circuit system connection that provides parts on the PCB board. Usually the color information of the PCB board is Chinese green products or brown, which is the color of solder resistance paint. It is an insulating protective layer, which can effectively protect the copper wire, but also prevent the parts from being welded to the wrong place. Now China's main board and graphics card are using multi-layer board, greatly increasing the company can be integrated wiring area. The multi-layer board uses more single or double-sided wiring boards, and puts a layer of insulation between each layer of the board after pressing. The number of layers of the PCB board represents that there are several layers as independent wiring layers, usually because the number of layers are even, and mainly contains the outermost two layers, the common PCB board is generally 4 to 8 layers of structure. The number of layers of many PCB boards and can be selected by the user to see the cross-section of the PCB board. But the truth is, no one has such good eyes. Therefore, the following is also a teaching method to teach you.

The multilayer plates are connected by buried and blind hole technology. Motherboards and graphics cards mostly use 4-layer PCBS, but some use 6-layer, 8-layer or even 10-layer PCBS. To know how many layers a PCB has, you can judge by looking at the pilot hole, because the four layers used on the motherboard and display card are the first and fourth layer lines, and the other layers are used for other purposes (grounding and power supply). Thus, like a double-layer board, the guide hole will pass through the PCB board.how to test a circuit board with a multimeter If some guide holes appear on the front of the PCB board, but cannot be found in the back, then it must be a 6/8 layer board. If the same pilot holes can be found on both sides of the PCB board, then it will be a 4-layer board. Tip: Point the motherboard or display card towards the light source, if the position of the hole can be transparent, it means 6/8 layers of board; Otherwise it's four layers.

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