If the security camera is broken or has a minor problem, it can be fixed.You don't have to buy new ones. Common breakdowns are easy to fix.However, it is important to understand what constitutes a surveillance camera.Composition of surveillance cameras.1. Surveillance camera shell.The shell of surveillance camera is mainly divided into waterproof camera shell, hemispheric camera shell and gun camera shell.The beauty of the camera is mainly reflected in the shell, which is also an important factor in the price of the whole machine. The same configuration in the market, if the camera shell is different, the price of the whole machine may double, which is usually the main interest of the camera manufacturer.2.CCD board chip.CCD board is mainly dominated by chips from sharp and SONY, as well as Korean and domestic solutions.Basically, the market scheme is roughly the same, but due to the different raw materials of components, some are domestic products, some are imported, some are mixed materials, the price and performance are somewhat different, which is also the main interests of the industry3. Infrared light panel.Infra-red lamp board basically is different of wick, each wick divides a lot of grade from 1 horn to 1 yuan, but basically with light lei and tripod yuan wick as main stream.4. The lens.Lens is an indispensable part of TV monitoring system. In cooperation with CCD camera, lens can put remote target image on the CCD target surface of camera.There are many kinds of lenses, which can be classified into short, medium, and long focal length lenses, and can be classified into wide Angle, standard and long distance lenses according to the size of the field of view. It can also be divided into fixed aperture setting lens, manual aperture setting lens, automatic aperture setting lens, manual aperture setting lens, automatic aperture setting lens, automatic aperture setting lens, automatic aperture setting lens and electric variable lens (refers to aperture, focal length, focal length and three kinds of focal length variable lens) and so on.The choice of lens is directly related to the quality of the camera, so in the practical application must be a reasonable choice of lens.5. Other components.Other components are mainly connected by lens holder, video line, screw and copper column. These components are necessary, but for better or worse, they are usually combined according to the technology of the cameraMost of the common faults are problems of analog and digital systems, which can be solved by checking and maintaining them.Maintenance of simulation system.First, let's see if the BNC joint is welded.From the camera to the splitter, from the splitter to the hard disk video, from the splitter to the matrix BNC.It will not take long for BNC to weld if it is not welded during installation.Measure whether the video line is broken.Second, see whether the camera's power supply (12V or 24V) is normal.Hard disk video, splitter, matrix power supply is normal.3. Check whether the BNC interface of hard disk video, splitter and matrix is normal by switching.That is, connect a jumper with an image channel to a jumper without an image channel to see if there is an image.If not, the channel is broken.Digital system maintenance.First, let's see if the LAN light on the switch is on.There are three common situations:(1) Bright flicker, indicating normal signal.(2) Light, no flicker, something is wrong with the camera.First, disconnect the camera and start over (most of the time)(3) Whether the crystal head RJ45 is in good condition (it depends on the switch and the camera) and whether the power supply of the camera is normal (12V or 24V).Measure whether the wire is broken.Second, check whether the host is working normally.Go into the system and see if you can find the IP address of the channel without the image.Otherwise, check the switch and camera for problems.Restart the webcam, switch, and host.As long as you make sure the hardware isn't broken, most reboots will be fixed.Four, when using optical fiber transmission, to see whether the two ends of the optical fiber transceiver is working normally.

This article introduces some common problems with consumer camcorders in the home. Today we'll look at some common problems with outdoor surveillance cameras.Common outdoor surveillance camera and hard disk video recorder are used together, so many problems are basically problems in the use of cameras and hard disk video recorder.The new camera of the same manufacturer cannot be found with the old VCR.Common problems are as follows: first, check the power supply line of the camera. If it is an independent power supply, the camera will block the light sensitivity at the lens after 20 seconds of power connection (as shown in the figure, if not, please block the lens), and observe whether the infrared ray is on.If light is confirmed, the power supply is normal.Then check the cable to see if the camera tail light and switch light are flashing. If not, please try to replace the cable (make sure the cable is good, or it may be different from the cable used by the manufacturer).After the above confirmation, the VCR still cannot search the camera. This may be because the VCR and the camera are not in the same network segment.Search for a fixed IP address in your network Settings (remember to change to an IP address on your VCR).In addition, it is recommended to ask the camera manufacturer for PC client search software. Fix IP search after connecting with PC, and then modify IP after searching.You can't find a camcorder or a video recorder from different manufacturers.In general, private agreements between brands are not common, basically using the OnVIF protocol for connectivity (most brands support it). After confirming that it is not a hardware wiring problem, the basic issues are as follows.Similar to some camera devices, after IP C is upgraded to V5.5.0 or higher, the ON VIF function is turned off by default, which needs to be manually turned ON, and the ON VIF administrator account needs to be set so that other brands of VCRS can be found and added normally.Ask the business if it does this.The device cannot adapt itself, and the factory IP is 170, such as network segment, it is recommended to ask the business to use the computer side search software.The VCR added a video camera but it didn't come out.This mainly has the following points.The camera code stream is too high.It is often the case that the main stream has no pictures, the secondary stream has pictures or neither.At this point the computer into the camera management interface code traffic will be reduced.(2) The new video camera is H. 265, and the video recorder is H. 264.At this point, the computer enters the management interface, changes the code to 264, and lowers the code stream.Finally, as with home purchases, don't upgrade your camera firmware.Deep and disorderly large area of reticulation interference is generated on the display, so that the image is all destroyed, forming the image and synchronization signal.The fault caused by short circuit or open circuit between the TV cable core and the screen network.This type of failure usually occurs on a BNC connection or other type of video connection.In other words, when such a failure phenomenon occurs, it is often not all the signals in the whole system that are defective, but only those in the way of bad connection.The problem can be solved by examining each one carefully.The second is the equipment failure caused by the power error, the power error roughly has the following several possibilities.:: Wrong supply line or voltage.:: Insufficient power supply (or insufficient power supply line diameter of one road, excessive step-down, etc.);:: Transmission line of power supply system occurs short circuit, open circuit, instant overvoltage and so on:: Especially due to power supply error or instantaneous overpressure and caused by equipment damage from time to time, therefore, in the system debugging, power supply, must be carefully checked and checked, can not be taken lightly.A black bar or white bar appears on the screen, scrolling slowly up or down.Cause of failure: Distinguish between a power problem and a wiring problem.Countermeasures: in the control host, the camera output signal with no problem is connected to the nearest power supply. If the above interference phenomenon does not appear on the display, it indicates that there is no problem with the control host.The next step is to use a portable monitor closely connected to the video output end of the front-end camera to examine each camera one by one.A display without an image display.Failure reason: whether the power supply, camera and circuit are disconnected, etc.Solution: Replace the power supply and check whether it is normal. If not, check whether the front camera is normal with engineering guarantee. If it is normal, check whether the circuit is on and off.Non-clean image switching by the host.The phenomenon of this fault is in the selected image, and other images superposition or with other images of the line synchronization signal interference.The reason lies in the poor quality of the host or matrix switch, which cannot meet the requirements of the isolation degree between images.If the rf transmission system is used, it may also be caused by excessive cross modulation and mutual modulation of the system.The sixth is the failure of the cradle head.Not long after use, the head does not operate normally or cannot rotate at all, which is a common fault of the head.In addition to the factors affecting product quality, there are generally the following reasons:(1) Yuntai is only allowed to install the camera, when using the hoisting method.In this way, the lifting mode will increase the operating load of the cradle head, so it will soon cause damage to the rotating mechanism of the cradle head, or even the motor will burn out.(ii) The total weight of the camera and its protective devices exceeds the carrying capacity of the cradle head.Especially in the outdoor use of the head, the protective cover is often overweight, easy to occur head rotation (especially vertical rotation) problem.(3) Outdoor yuntai due to the environmental temperature is too high, too low, waterproof, antifreeze measures are not in place, causing damage or even damage.A fault caused by a mismatching of the characteristic impedance of a transmission line.This phenomenon is characterized by the appearance of several equally spaced vertical stripes on the screen of the display, with the frequency of the interference signal being basically an integer multiple of the line frequency.The reason for this is that video transmission line characteristic impedance is not 75 Ω, leading to the impedance mismatch.It can also be said that the reason for this interference phenomenon is that the impedance and distribution parameters of the video cable do not meet the requirements.The solution generally depends on "resistance in series at the beginning" or "resistance at the end point".In addition, in the case of very short video transmission distance (usually within 150 meters), the use of impedance mismatch and large distribution parameters of the video cable will not necessarily produce the above interference.Accordingly, choose to buy video cable, must assure its quality to be able to solve above problem.If necessary, the cables should be sampled.Is the surveillance camera image distorted or geometrically distorted?This could be due to a problem with the surveillance camera, the monitor's geometric correction circuit, or the optical lens, or a poor internal contact between the video connector and the ball machine, or a mismatch between the equipment's characteristic impedance and the surveillance camera's output impedance.How many black bars or bars appear on the monitor screen?This is generally due to the machine power supply output voltage ripple is too large, should be strengthened filtering, using good PERFORMANCE of DC voltage regulator power supply.Is the night vision infrared surveillance camera normal in the daytime and white at night?This phenomenon is usually caused by reflectors in the machine environment or small reflectors in space, caused by infrared light reflection.To solve this problem, we must first determine whether there are reflectors in the use environment, and try to improve the use environment; Secondly, check whether the effective infrared distance of the machine is relative to the actual use distance; If a distant machine is used in a small space, the infrared light is too strong to whiten the image.X. Common video interference failures.When a black bar or white bar appears on the screen of the monitor and scrolls up and down, this is known as 50 HZ power interference.This kind of interference is mainly caused by the improper grounding of two equipment front end and control center, the formation of potential difference circuit into the system, or the equipment itself power supply performance degradation.* Snowflake noise exists in the image, which is mainly caused by signal attenuation on the transmission line and coupling of high-frequency interference.The image has a double image, or the image is white, or the character wobbles, or produces several equally spaced vertical line interference on the display screen.The reason is that the characteristic impedance between video transmission lines or equipment is not 75 Ω, leading to impedance mismatch.* Tilt interference, pulsating interference, power supply interference.At a young age, this interference does not drown out the normal image, but in severe cases, it distorts the image so that it cannot be seen.There are many reasons for this phenomenon, which are also very complex, such as poor quality of the video transmission line, especially poor shielding performance, or the presence of clutter in the power supply system. It may also be due to the presence of strong interference sources near the system.* Large-area reticulate interference, also known as single-frequency interference.This is mainly due to the video cable core and shielding network short circuit, open or BNC connector contact fault.Monitor installation and debugging, we often encounter some strange problems, now let's share some of them.Surveillance card (flash and jump state when people walk, which is jump second)This kind of fault is often encountered by all of us. Nowadays, all webcams are webcams. It is very possible for webcams to have picture CARDS.Reason 1: Improper switch configuration and insufficient switch bandwidth will cause screen lag. I suggest that you can use the 100-megabyte switch for monitoring 6 or below. If the switch exceeds 6, you should choose the switch uploaded with gigabit.In addition, remind everyone below, the switch to buy a little better ah, do not coax cheap to buy fake goods.There must be a reduction.

The first thing is design.Most of our surveillance installation scenes are family homes, shops, industrial plants, etc., basically more than four cameras. If only one or two cameras are installed, then you can directly select the webcam version of network plug-in card.In view of the influence of monitoring threading, power connection, camera installation location and other factors, we must first check the installation location of the equipment, threading location and power supply selection before installation, which will reduce a lot of trouble for your subsequent work.Select the camera.Camera choices can be blurry for the uninitiated, and you can go online and search for brands and models you haven't heard of, along with a plethora of fancy features to keep you from getting started. So at this time we can find a specialized service company as a reference, or to let them from the service to the installation of a one-stop service.But in the installation of the first to determine whether it is indoor or outdoor installation, indoor is a hemisphere machine, outdoor is the gun, it is to understand that the hemisphere machine is basically not waterproof, is applicable to the room does not occupy a place, more hidden.The switches on the monitor are basically classified into normal switches and POE switches. If you are a POE-powered camera, the POE switch is required to cooperate.The monitoring device has its own dedicated hard disk, often referred to as the purple disk.Monitor on the hard disk requirements are very high, hard disk write speed to be stable, with a long time stability, because the monitor hard disk needs 24 hours of uninterrupted read and write, constantly erase the written data, ordinary hard disk can not be competent for such a high intensity of work.Bought secondhand common hard disk to serve as monitor hard disk before, it is covet cheapness, basically it was broken before long, anyway also be the gain outweighed the loss.(Never lose power suddenly while the VCR is working, and the hard disk burns out easily.)Network and power lines.Net line we must choose 8 core, line diameter is the thicker the better, the material to choose oxygen free copper, and the poor quality of the wire is aluminum wire or copper clad aluminum wire this do not buy.If installed outdoors, choose an outdoor net with a waterproof cover.The power line is also pure copper, also divided into indoor and outdoor two kinds, line diameter as thick as possible, otherwise it may cause insufficient power supply.Above is the equipment you need to buy to install monitoring, we will buy according to their own needs, I hope these can help you.