—What are the components of a small PCB board? Let me explain to you in detail below:
一. Circuit board composition
The circuit board is mainly composed of pads, vias, mounting holes, wires, components, connectors, filling, electrical boundaries, etc.
(1) Pad: a metal hole for soldering component pins.
(2) Vias: There are metal vias and non-metal vias, among which metal vias are used to connect component pins between layers.
(3) Mounting hole: used to fix the circuit board.
(4)) Conductors: Electrical network copper films used to connect component pins.
(5) Connectors: Components used for connection between circuit boards.
(6) Filling: It is used for copper plating of the ground wire network, which can effectively reduce the impedance.
(7) Electrical boundary: used to determine the size of the circuit board, and the components on the board cannot exceed the boundary.
二, the maintenance of the circuit board
1. Half-year maintenance:
(1) Clean the dust on the board every quarter, clean it with a special cleaning solution, and dry it with a hair dryer.
(2) Observe whether the electronic components in the circuit have been subjected to high temperature traces, and whether the electrolytic capacitor has bulged and leaked.
2. Annual maintenance:
⑴ Clean up the dust on the board.
(2) Sampling check the capacity of the electrolytic capacitor in the circuit board. If the capacity of the electrolytic capacitor is found to be lower than 20% of the nominal capacity, it should be replaced.
(3) For high-power devices coated with heat-dissipating silicon grease, check whether the heat-dissipating silicon grease is dry, so as to prevent the high-power devices in the circuit board from burning out due to poor heat dissipation.
