Five major faults in Xiaoyi building intercom

[ Huaqiang Security Network News ] Speaking of the wide application of building intercom in the market, and the voice of thousands of households opened at the same time, the problems encountered in the installation process of the engineering firm are also varied.
building intercom
1. Site of Longcheng Jiayuan Community, Xinyang City
Symptom: Encoded black-and-white visual system, in which one of the extensions monitors the image of the host computer with severe texture interference.
Solution: Replace an extension video cable.
Principle analysis: The user-purchased video cable production process is too poor, for the non-standard video cable, the video cable copper core is not wrapped in the middle position, which belongs to the eccentric core, causing problems in the extension video.
Lessons learned: Users can't just pursue the low price when purchasing the wire. When the price is low to a certain extent, the quality of the wire should be strictly checked. There are copper clad aluminum, copper clad steel, non-standard, doping and so on. It is recommended to use the wires of regular manufacturers. Hong Kong TPV has a wire and cable factory in Beijing, and the quality is relatively reliable.
Second, the Weihe Jindi Ziwei Garden scene
Symptom: Press the visual system directly, the door host has noise during standby.
Solution: Use a wire to connect the 20V power supply to the ground. It is connected to a 20 volt negative electrode on the main casing or the door. If the door is not well grounded, you can also pull the 20 volt negative wire directly to the ground, and use the steel bar to nail it into the ground for about 1 meter, and splash the salt water around it.
Principle analysis: The power supply grounding condition of the residential area is not good, and the interference signal cannot be directly introduced into the earth, but is amplified by the host power amplifier to form noise.
Third, Sanmenxia site
Fault phenomenon: Directly press the color visual system, there are 12 households on the sixth floor, and there is no color on the sixth floor.
Exclusion process: First call the Sanmenxia customer to check the line, the other manager also let the construction workers check, the construction workers have always said that there is no problem. Our engineers once again telephoned: Change the six-story non-color extension to the fifth floor. The result is colored, indicating that there is no problem with the extension host. The problem is on the online road, so the emphasis is on the fifth floor. However, the construction workers are not willing to take responsibility, let the other manager call us, and strongly demand that the factory send engineers to the site for inspection. After the engineer went there, he found that there were two 18-volt power cables at the extension on the fifth floor. One of the multi-core wires was stripped of more than ten copper wires by the constructor. The wires with a cross-sectional area of ​​0.5 had 28 copper wires. Now There are more than a dozen of them left, causing a severe drop in voltage, which always affects no color.
Solution: Reconnect the partially broken 18V power cord.
Lessons learned: The responsibility of the construction and wiring staff and the rigor of the work attitude are very important. For individual construction workers who are not responsible, a small mistake can lead to serious consequences.
4. Xinyang Yihe Garden Community Site Fault phenomenon: Coded color vision system, the image of the extension is distorted and the color reproduction is excessive.
Solution: Add a 75 ohm matching resistor to the ground on the video main line.
Principle analysis: The video signals of each extension of the building system are superimposed in parallel on a video main line, making the video signal stronger, so the image of the extension has a phenomenon of image distortion and strong color. Add a 75 ohm resistor to the ground on the video main line to weaken part of the video signal and restore the normal image.
V. The scene of the family building of the Henan Provincial Inspection Institute Fault phenomenon: the coded intercom system, the whole unit host gives the extension a small voice.
Solution: The microphone hole of the host is blocked by the bug, and it is cleared and returned to normal.
Principle analysis: The microphone hole on the main unit casing is only 1 mm in diameter, and any foreign matter blocking the small hole will weaken the sound transmitted to the microphone.

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