What are the components of PCB?
1. Circuit board composition
The circuit board is mainly composed of pads, vias, mounting holes, wires, components, connectors, filling, electrical boundaries, etc.
The main functions of each component are as follows:
Pad: A metal hole used to solder the pins of components.
Vias: There are metal vias and non-metal vias. Metal vias are used to connect component pins between layers.
Mounting hole: used to fix the circuit board.
Wire: The copper film of the electrical network used to connect the pins of the components.
Connectors: components used to connect between circuit boards.
Filling: Copper coating for ground wire network, which can effectively reduce impedance.
Electrical boundary: used to determine the size of the circuit board, all components on the circuit board cannot exceed the boundary.
2. Maintenance of the circuit board
The circuit board should be maintained regularly during use to ensure that the circuit board is working in good condition and reduce the failure rate of the circuit board. The specific cases are as follows:
1. Semi-annual maintenance:
⑴Clean up the dust on the circuit board every quarter, use a special cleaning fluid to clean it, and dry it with a hair dryer.
⑵ Observe whether the electronic components in the circuit have traces of high temperature, and whether the electrolytic capacitors have bulged and leaked.
2. Annual maintenance:
⑴ Clean up the dust on the circuit board.
⑵Samply check the electrolytic capacitor capacity in the circuit board. If the electrolytic capacitor is found to be less than 20% of the nominal capacity, it should be replaced.
⑶ For high-power devices coated with heat-dissipating grease, check whether the heat-dissipating grease is dry or not. After removing the dry heat-dissipating grease, apply new heat-dissipating grease to prevent the high-power devices in the circuit board from being damaged. Burn out due to poor heat dissipation.
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