source:Industry News release time:2023-03-17 Article author:yu Popular:pcb
1. Short -circuit
Common short circuits include: when the space or distance between the bronze lines is very small, short circuit will occur; the leading component leader of the pruning will cause a short circuit; the floating in the air can guide the thin line between the bronze lines.
2. Bridge
Component failure: Deadial components usually input or output short circuit to power or land.
3. Open the way
When the trace line is broken, or when the solder is only on the pad and not on the component lead, the road will occur. In this case, there is no adhesion or connection between the components and the PCB. Just like short circuits, the opening may also occur during the production or welding process and other operations.
3. The loose or misplaced of the component
Including insufficient circuit board support, backflow furnace settings, welding paste problems, artificial errors, etc., the vibration or bouncing of the welding PCB board device is caused.
4. Welding problem
(1) Dids welding joints: Due to external disturbances, the solder moves before solidification.
(2) Cold welding: This situation occurs when the solder cannot melt correctly, resulting in rough surfaces and unreliable connections.
(3) Weld bridge: This happens when the weld is crossed and the two leads are physically connected together.
(4) Other: pads: lack of wetting of pins or leads; too much or too little solder; pads that are raised due to overheating or rough welding.
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