What are the components of the pcb board? How to judge good or bad?

Date：2023-02-10 14:06:57Views：607

The Chinese name of PCB is printed circuit board, also known as printed circuit board, which is an important electronic component. In today's society, electronic technology is highly developed, and there are electronic products everywhere. There are circuit boards in electronic products. It is the carrier or core part of electronic products. This article has collected and collated some information, hoping to have greater reference value for readers.

Composition of circuit board

The circuit board is mainly composed of pads, vias, mounting holes, wires, components, connectors, fillers, electrical boundaries, etc.

(1) Soldering pad: metal hole used to weld component pins.

(2) Through hole: there are metal through hole and nonmetal through hole, and the metal through hole is used to connect component pins between layers.

(3) Mounting hole: used to fix the circuit board.

(4) Wire: the copper film of electrical network used to connect the pins of components.

(5) Connector: used for connecting components between circuit boards.

(6) Filling: copper coating for ground wire network can effectively reduce impedance.

(7) Electrical boundary: used to determine the size of the circuit board, and the components on the board cannot exceed this boundary.

Maintenance of circuit board

1. Semi-annual maintenance:

(1) Clean the dust on the board quarterly, clean it with special cleaning solution, and dry it with a hair dryer.

(2) Observe whether the electronic components in the circuit have been exposed to high temperature, and whether the electrolytic capacitor has bulged and leaked.

2. Annual maintenance:

(1) Clean the dust on the board.

(2) Conduct spot check on the capacity of electrolytic capacitor in the circuit board. If it is found that the capacity of electrolytic capacitor is less than 20% of the nominal capacity, replace it.

(3) For high-power devices coated with heat-dissipating silicone grease, check whether the heat-dissipating silicone grease is dry and solid to prevent the high-power devices in the circuit board from burning due to poor heat dissipation.

Methods for judging the quality of PCB

1. Size and thickness

The thickness of circuit board is different from that of standard circuit board. Customers can measure and check according to the thickness and specification of their products.

2. Appearance resolution

The printing ink on the appearance should be covered in time, and the copper surface should be free of air oxidation. In addition, all surfaces should be invisible to meet the quality requirements.

3. Light and color

The external circuit boards are covered with ink, and the circuit boards can play an insulating role. If the color of the board is not bright and there is less ink, the insulation board itself is not good.

4. Whether the electric welding is firm

Because there are many parts on the circuit board, if the welding is not good, the parts are easy to fall off the circuit board, which seriously affects the welding quality of the circuit board.

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