The flying line refers to the fact that the cable is often pressed, causing the folded part to be broken and the contact is poor, and the fine enameled wire is soldered with a soldering iron at both ends of the break.
When some motherboard manufacturers with poor design standards are designing traces, the final product may be flawed due to technical strength. At this point, we will take the manual repair method to solve the problem. This kind of wire that appears due to unreasonable design is called "flying line." According to the introduction of the relevant technical personnel, the "flying line" problem stems from the design or manufacture of the board. If the signal line is left unconnected, this method is usually used to make up for the cost. The design of the “flying line†is inherently dangerous and can often be seen in the small workshops that repair mobile phones on the street. In order to simplify the operation, the maintenance personnel use an electric iron to weld the mainboard completely differently, and the lines fly around. Not unusual, but people in the industry are aware that this "flying line" will bring instability to the product.
Experts believe that there are two possibilities for the impact of this flying line on product quality: “If the flying line is connected to a non-high frequency signal line or is not close to a high frequency line, the quality can be considered as having no effect, but the flying line is If the connection is a high-frequency line, there may be a quality problem." He said: "Because fly-wires are non-scale mass production in industrial production, they are basically hand-welded. In terms of welding quality, due to different welding workers, different product performances will result."
Judging the good or bad of a motherboard board alignment In addition to observing the PCB material selection, routing layout and cleaning process, there is an easiest way is to see if there is no flying line.
1. Try to choose a constant temperature soldering station with temperature control. We do not recommend using a soldering pen without temperature control.
2. The outer coating of the enameled wire should not be removed too much, and the inner conductor can be exposed slightly.
3. Add a little solder to the exposed conductor before soldering. Do not over-thick.
4, before welding, pay attention to observe the solder joint at the adequacy of solder, if not enough to make up a little tin
5, pay attention to whether the solid after welding, can not pull down a little hard to get out.
6. Check whether the solder joints are clean after welding. If they are not parts of the key components, the novice can clean the solder joints with tweezers.
7. Check whether there is a short circuit in the welding position and whether the connectivity is good
Litron EDA is an easy-to-use online circuit design tool. With regard to flying line techniques, you can use the Design Manager to remove the GND network before cabling, and then turn it on later to open the copper to reduce flying line interference.
1. When the two packages have the same pad network, flying lines appear, indicating that the two pads can be connected by wires.
2. If you want to turn off the fly line of a certain network, you can remove the network hook in the Design Manager; if you still remove the hook and then route it, the track will not be displayed. The network name is displayed on the route of the route.
Based on this technique, you can remove the GND network before cabling, and then open it later when copper is laid, which can reduce the interference of flying lines.
3. If you want to highlight the color of the fly line, you can switch to the fly line; if you want to change the color of the fly line, you can modify it in the layer configuration.
The military Wire Harness is an industry applied in the military, and the arms industry is a powerful industrial sector.
In China, the military industry mainly refers to the industrial departments and factories and other military units that mainly serve the national defense construction and directly provide weapons and equipment and other military supplies to the troops. Weapons products mainly include the weapons industry, aviation industry, shipbuilding industry, electronics industry, nuclear industry, aerospace industry, etc. The main products are guns, ammunition, tanks, military vehicles, military aircraft, military ships, military electronic equipment, rockets, missiles, military aerospace equipment, nuclear weapons and military clothing.
Typical requirements for military wire harnesses:
Excellent optical performance;
Strong connections to withstand shock and vibration;
Operating temperature range from -55°C to +125°C and beyond;
Lightweight design and compact size;
Combining high density and high channel count;
Low sensitivity to corrosion, pressure and humidity.
With our diverse capabilities and certifications, Kable-X is proud to be a top military Cable Assembly manufacturer. Kable-X's robust quality assurance process ensures that we meet all documentation requirements, product configuration and verification requirements. All finished cable assemblies have undergone strict continuity, resistance, mechanical integrity and withstand voltage electrical tests to ensure reliability and performance under any conditions.
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Kable-X Technology (Suzhou) Co., Ltd , https://www.kable-x-tech.com