Community building intercom system has been to every family, there are networking systems, video systems, intercom systems, etc., a wide range of systems, problems encountered by contractors during the installation process is varied. Based on years of field experience, the author summarizes the most common types of problems. Each type of problem has been analyzed in detail and it is hoped that they will help the engineering company.
One, Sanmenxia site
Symptoms: Directly press the color vision system, 12 floors of 6 floors, no color on the 6th floor.
Exclusion process: First call the Sanmenxia customer to check the line, the other manager also let the construction workers to check, and the construction workers have been reflecting that there is no problem. Our engineers telephone guidance again: the six did not change the color of the extension to the fifth floor, the result will have color, indicating extension hosts have no problem, the problem is on the line, so to emphasize focus on examination of the fifth floor line again. However, construction workers are not willing to take responsibility for the other party's manager to call us and strongly urge the factory to send engineers to the site for inspection. After the engineer went to find: at the fifth floor extension extension, there are two 18-volt power lines. One of the multi-core conductors was stripped of more than a dozen copper wires by the constructor. Originally, the cross-sectional area of ​​0.5 wires had 28 copper wires. There are more than a dozen left, resulting in a serious drop in voltage, which has never affected color.
Solution: Reconnect the partially stripped 18V power cable.
Lessons learned: It is important that the responsibility of the construction wiring staff and the rigorous work attitude be important. For individual construction workers who do not have a sense of responsibility, a small mistake can lead to serious consequences.
II. Xinyang Garden District
Symptoms: Coded color vision system, distortion of the extension image and excessive color reproduction.
Solution: Add a 75 ohm matching resistor to the video mainline.
Analysis Principle: building system extension of each video signal is connected in parallel with a main line video overlay, so that the video signal is stronger, so the image appears distorted image extension, the phenomenon of strong color. Add a 75 ohm resistor to ground on the video main line to weaken part of the video signal and restore normal images.
III. Scene of Jiayuan Community, Longcheng Town, Xinyang City
Symptoms: Encoded black and white video system, one of the extensions to monitor the entrance host image when there is a serious moire.
Solution: Replace the extension video cable.
Principle analysis: The video line produced by the user has a poor production process. It is a non-standard video cable. The copper core of the video cable is not wrapped in the middle position and belongs to the eccentric core, causing problems in the extension video.
Lessons learned: The user can not only pursue low prices when purchasing wires, but when the price is low to a certain extent, it is necessary to strictly inspect the quality of the wires. There are copper clad aluminum, copper clad steel, non-standard, doping and other methods. It is recommended to use the wires of regular manufacturers. Hong Kong TPV has a wire and cable factory in Beijing and its quality is relatively reliable.
IV. The Weihe River Garden
Symptoms: Directly press the visual system, the door host has noise during standby.
Solution: Connect the ground of the 20V power supply to the ground with a wire. It is connected to the negative electrode of 20 volts on either the main housing or the main door. If the gate is not grounded well, you can pull the 20-volt negative electrode directly onto the earth with a wire, and use a steel bar to nail it into the ground about 1 meter, and spill salt water around.
Principle analysis: The power supply grounding of the community is not good, causing the interference signal to not be directly introduced into the earth, but amplified by the host amplifier.
V. Xinxiang Bo Yuanlong Garden Scene
Symptom: Coded visual swipe system, electronically controlled lock cannot be opened Solution: Reconnect 12V power cable Principle analysis: Workers disconnect the 12V power cord copper wire when wiring. Because the unlocking current is very large, if the 12V power cord is stripped, the 12V power cord is very thin, and the current and voltage are insufficient to unlock.
VI. Jiaozuo City Liberated Area Education Bureau
Symptom: Encoded black-and-white video system, 16-story, one-story, two-story, image ghosting and the lower the floor, the more serious solutions: (1) Building isolator.
(2) at the seventh floor of the video cable becomes disconnected, eight or more re-extension band was pulled from the video line the host, the host to add video video output isolators, so that the video signal is divided two-way, one video Line 1-7 layers, another video line 8-16 layers.
(3) Or do not pull the video line, then the video signal of more than seven layers should be output from the video isolators of the seventh layer.
Principle Analysis: Due to the video signal transfer point needs, the higher the floor, the video signal is down the more serious reflection appeared ghosting, so you must use the above method to solve high-level video problems.
7. Changchun European Garden Site
Symptoms: Press black and white visual system directly, there is no image in the entire unit Solution: Bad camera, replace the camera.
Principle analysis: The video cable is shorted with the 4th line to burn out the camera. Because there is 12V on the 4th line, the video circuit of the camera will be burned out if it is short circuited with the video line. In order to prevent this situation from happening again, our factory now has an isolator for the camera video output to prevent such incidents from happening.
Eight, Zhengzhou West Development Zone Wisdom Garden
Symptoms: Directly encoded black and white visual system, visual extension images have moire interference.
Solution: Add a 4700uf/25V capacitor filter at the input of each layer of the video isolator 18V.
Principle analysis: Due to clutter on the site supply voltage, 18V output to each floor isolator requires line filtering to filter out clutter.
9. Zhengzhou Putian Field
Symptom: mixed coding system, the call-through occurs howling phenomenon, sound broadcasting station Solution: In the "T" line-to-ground plus most distal 1UF capacitor filter, re-soldering microphone, sound can remove the broadcast, Xiao Called balance, potentiometer to miss the critical value, that is transferred back to a little when it is not howling.
Principle Analysis: This area away from the television tower too close, if the wiring is unreasonable, it will easily receive the broadcast sound, so the "T" line on the most remote consider the wave, change the input impedance of the amplifier. Whistling If you do not miss the critical value, it may happen that this extension does not whine, and another extension whine, because the length of the line is different.
X. Zhengzhou Shangdu International Apartment Site
Symptom: Code 28 intercom network system on each floor of 28, if you call the first room number and immediately hang up and then call the second room number, and still the first room number is ringing.
Solution: Connect a 1K resistor to ground on the “V†line. The 1K resistor is added to discharge the "V" line. Therefore, the line of the system "V", "T" and "G" is too long. When calling, the "V" line will have a voltage of 5V, and immediately call the second user at this time. The electricity of the "V" line has not yet been discharged, so it is still the first ringing.
Analysis Principle: special case because the cell, each cell has 16 layers, each with several households, a user unit 700 to the extension line so many wires, resulting in a line voltage V not immediately bleed completely, so that the host software! Misjudgment.
Eleventh, Henan Province Inspection House Family House Community Site
Symptoms: Encoded intercom system, the entire unit host to the extension to send a small voice.
Solution: The host microphone hole was blocked by a bug, cleared it, and returned to normal.
Principle analysis: The diameter of the microphone hole on the main body casing is only 1 mm, and any foreign matter blocking the small hole will weaken the sound transmitted to the microphone.
Twelve, * Brigade Family Court
Symptoms: Encoded intercom system, mains howling, volume potentiometer adjustment can not be resolved.
Solution: After the host is turned on, it is found that there is a dead moth in the circuit board, causing a short circuit.
Principle analysis: The moth drills into the host, causing short circuiting of the electronic components on the circuit board.
One, Sanmenxia site
Symptoms: Directly press the color vision system, 12 floors of 6 floors, no color on the 6th floor.
Exclusion process: First call the Sanmenxia customer to check the line, the other manager also let the construction workers to check, and the construction workers have been reflecting that there is no problem. Our engineers telephone guidance again: the six did not change the color of the extension to the fifth floor, the result will have color, indicating extension hosts have no problem, the problem is on the line, so to emphasize focus on examination of the fifth floor line again. However, construction workers are not willing to take responsibility for the other party's manager to call us and strongly urge the factory to send engineers to the site for inspection. After the engineer went to find: at the fifth floor extension extension, there are two 18-volt power lines. One of the multi-core conductors was stripped of more than a dozen copper wires by the constructor. Originally, the cross-sectional area of ​​0.5 wires had 28 copper wires. There are more than a dozen left, resulting in a serious drop in voltage, which has never affected color.
Solution: Reconnect the partially stripped 18V power cable.
Lessons learned: It is important that the responsibility of the construction wiring staff and the rigorous work attitude be important. For individual construction workers who do not have a sense of responsibility, a small mistake can lead to serious consequences.
II. Xinyang Garden District
Symptoms: Coded color vision system, distortion of the extension image and excessive color reproduction.
Solution: Add a 75 ohm matching resistor to the video mainline.
Analysis Principle: building system extension of each video signal is connected in parallel with a main line video overlay, so that the video signal is stronger, so the image appears distorted image extension, the phenomenon of strong color. Add a 75 ohm resistor to ground on the video main line to weaken part of the video signal and restore normal images.
III. Scene of Jiayuan Community, Longcheng Town, Xinyang City
Symptoms: Encoded black and white video system, one of the extensions to monitor the entrance host image when there is a serious moire.
Solution: Replace the extension video cable.
Principle analysis: The video line produced by the user has a poor production process. It is a non-standard video cable. The copper core of the video cable is not wrapped in the middle position and belongs to the eccentric core, causing problems in the extension video.
Lessons learned: The user can not only pursue low prices when purchasing wires, but when the price is low to a certain extent, it is necessary to strictly inspect the quality of the wires. There are copper clad aluminum, copper clad steel, non-standard, doping and other methods. It is recommended to use the wires of regular manufacturers. Hong Kong TPV has a wire and cable factory in Beijing and its quality is relatively reliable.
IV. The Weihe River Garden
Symptoms: Directly press the visual system, the door host has noise during standby.
Solution: Connect the ground of the 20V power supply to the ground with a wire. It is connected to the negative electrode of 20 volts on either the main housing or the main door. If the gate is not grounded well, you can pull the 20-volt negative electrode directly onto the earth with a wire, and use a steel bar to nail it into the ground about 1 meter, and spill salt water around.
Principle analysis: The power supply grounding of the community is not good, causing the interference signal to not be directly introduced into the earth, but amplified by the host amplifier.
V. Xinxiang Bo Yuanlong Garden Scene
Symptom: Coded visual swipe system, electronically controlled lock cannot be opened Solution: Reconnect 12V power cable Principle analysis: Workers disconnect the 12V power cord copper wire when wiring. Because the unlocking current is very large, if the 12V power cord is stripped, the 12V power cord is very thin, and the current and voltage are insufficient to unlock.
VI. Jiaozuo City Liberated Area Education Bureau
Symptom: Encoded black-and-white video system, 16-story, one-story, two-story, image ghosting and the lower the floor, the more serious solutions: (1) Building isolator.
(2) at the seventh floor of the video cable becomes disconnected, eight or more re-extension band was pulled from the video line the host, the host to add video video output isolators, so that the video signal is divided two-way, one video Line 1-7 layers, another video line 8-16 layers.
(3) Or do not pull the video line, then the video signal of more than seven layers should be output from the video isolators of the seventh layer.
Principle Analysis: Due to the video signal transfer point needs, the higher the floor, the video signal is down the more serious reflection appeared ghosting, so you must use the above method to solve high-level video problems.
7. Changchun European Garden Site
Symptoms: Press black and white visual system directly, there is no image in the entire unit Solution: Bad camera, replace the camera.
Principle analysis: The video cable is shorted with the 4th line to burn out the camera. Because there is 12V on the 4th line, the video circuit of the camera will be burned out if it is short circuited with the video line. In order to prevent this situation from happening again, our factory now has an isolator for the camera video output to prevent such incidents from happening.
Eight, Zhengzhou West Development Zone Wisdom Garden
Symptoms: Directly encoded black and white visual system, visual extension images have moire interference.
Solution: Add a 4700uf/25V capacitor filter at the input of each layer of the video isolator 18V.
Principle analysis: Due to clutter on the site supply voltage, 18V output to each floor isolator requires line filtering to filter out clutter.
9. Zhengzhou Putian Field
Symptom: mixed coding system, the call-through occurs howling phenomenon, sound broadcasting station Solution: In the "T" line-to-ground plus most distal 1UF capacitor filter, re-soldering microphone, sound can remove the broadcast, Xiao Called balance, potentiometer to miss the critical value, that is transferred back to a little when it is not howling.
Principle Analysis: This area away from the television tower too close, if the wiring is unreasonable, it will easily receive the broadcast sound, so the "T" line on the most remote consider the wave, change the input impedance of the amplifier. Whistling If you do not miss the critical value, it may happen that this extension does not whine, and another extension whine, because the length of the line is different.
X. Zhengzhou Shangdu International Apartment Site
Symptom: Code 28 intercom network system on each floor of 28, if you call the first room number and immediately hang up and then call the second room number, and still the first room number is ringing.
Solution: Connect a 1K resistor to ground on the “V†line. The 1K resistor is added to discharge the "V" line. Therefore, the line of the system "V", "T" and "G" is too long. When calling, the "V" line will have a voltage of 5V, and immediately call the second user at this time. The electricity of the "V" line has not yet been discharged, so it is still the first ringing.
Analysis Principle: special case because the cell, each cell has 16 layers, each with several households, a user unit 700 to the extension line so many wires, resulting in a line voltage V not immediately bleed completely, so that the host software! Misjudgment.
Eleventh, Henan Province Inspection House Family House Community Site
Symptoms: Encoded intercom system, the entire unit host to the extension to send a small voice.
Solution: The host microphone hole was blocked by a bug, cleared it, and returned to normal.
Principle analysis: The diameter of the microphone hole on the main body casing is only 1 mm, and any foreign matter blocking the small hole will weaken the sound transmitted to the microphone.
Twelve, * Brigade Family Court
Symptoms: Encoded intercom system, mains howling, volume potentiometer adjustment can not be resolved.
Solution: After the host is turned on, it is found that there is a dead moth in the circuit board, causing a short circuit.
Principle analysis: The moth drills into the host, causing short circuiting of the electronic components on the circuit board.
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