There are some video surveillance system to deal with common problem as follow:
Fault 1: the normal connection power line, the control room Terminal no video image display, monitor black screen, hard disk video Machine, matrix, graphics division and other "no video signal" prompt does not exist.
Troubleshooting: This phenomenon can be excluded from the general transmission Line failure, does not appear "NO signal" and other tips, proof of front-end video Number has been returned to the control device. First, confirm that the conditions of good lighting conditions Well, the camera monitor area, monitor brightness parameter settings are positive Often, then adjust the camera lens aperture, as still no figure Like the display, can be replaced by the camera and power test can be resolved.
Fault 2: normal connection after the power line, the control room Terminal no image display, monitor black screen, hard disk video recorder, Matrix and graphics dividers such as "no video signal" prompt exists. Troubleshooting: This phenomenon can be concluded that the video front-end The number is not normally transferred back to the control device. First confirm the camera Is working properly, remove the camera failure, if the fault persists, Check the video cable and BNC header, check the test connection is correct Can be restored.
Fault 3: use a keyboard to control a camera, in The main monitor did not turn, but found another image in the small monitor Device on the rotation; terminal on the ball machine can not control or control not working;The image on the monitor indicates an address or protocol error.Troubleshooting: The cause of these failures may be Decoder is not powered, control line or image error caused by the wrong.First ensure that the decoder is working properly, and secondly to ensure that control lines Working properly. If you use the video transmitter, and use Connected to connect the way, there will be a problem with the monitoring point Resulting in all control points can not be controlled, for the unplug a problem Point of the control signal line or add multiple control controller. Such as Then the wrong image, can not normally control the dome ball, the ball to be measured Machine and turn the ball machine BNC connector head in the terminal on the switch that is Can be resolved. If you can not effectively control the ball machine, check the decoder to Address is set correctly, baud rate, protocol is selected correctly, Will be consistent with its settings can be resolved.
Fault 4: the image appears on the screen snowflakes, stripes or Shu Wen, the picture is not clear on the screen. Troubleshooting: There are three types of such failure: First The lens does not set the adjustment is good, near the interference or power is not Video surveillance system to deal with common problems "nine law" The second is the video transmission line shielding performance difference, the video line Line resistance is too large; Third, the video line of the characteristic impedance is not compliance or Distribution parameters are out of specification. First check that the camera settings are correct Correct, and then test the power supply, check the video cable connected Mouth is solid, BNC head with or without welding, leakage welding phenomenon, Video cable is too long, resulting in attenuation (usually rg6 cable as Frequency line is best not to exceed 400M, rg59+power cable video cable do not exceed Over 300M); finally check whether there is strong magnetic interference in the vicinity of the source, If so, re-wiring or installation of other anti-jamming equipment that is Can be resolved.
Fault 5: This phenomenon may be caused by the camera ; cable fault; monitor / DVR input channel section Or the entire fault. First check the camera to ensure that the camera work For normal, followed by video cable or the ball machine to check whether the cable asked, The ball machine can be removed, the use of video surveillance tester into Line detection, such as image and control is normal, that this video line Failure, replacement can be. If there is no image, explain the dome cable or The lens problem, the replacement can be resolved. If the fault is not Exclude, then the ball machine to the monitor / DVR inside the entire line Check the use of video monitoring tester connected to the input side BNC head, if there is no image, indicating a cable fault, right Its repair can be. If the monitor / DVR input channel is partially or The entire failure, replace the monitor / DVR input channel can be.
Fault 6: the ball machine power-on self-test or run for some time Between, the automatic rotation.Troubleshooting: This phenomenon may be a parameter setting problem;As well as the controller of the garbled and 485 line interference caused. First of all Check whether the power-on mode in the menu is auto-scan mode, such as If it is, the power mode to manual scan mode can be; If not set, first disconnect the 485 control line, observe whether or not There will be such a situation, if you stop the rotation can be judged as control The device made over the garbled or 485 communication lines have interference, Replace the controller and 485 with a shielded communication lines can be solved Resolution.
Fault 7: After the ball machine power, keep self-test.Troubleshooting: This phenomenon can be concluded that the supply voltage is too Low or insufficient power. First check the current ball machine supply voltage Or whether the matching power and the transformer, such as abnormal and timely Replacement can be resolved. Recommend the use of manufacturers supporting special transformer Exchange ball machine using more than 2.5A AC24V transformer,Installed from the ball machine from the ball no more than 30 meters, diameter For 1 mm; DC ball machine using 4A or more DC15V Transformers, installation distance of the ball from the ball machine is not more than 10 meters,The wire diameter is 1 mm2.
Fault 8: the ball machine power supply self-test, the display black screen. Troubleshooting:This phenomenon may be generated control Line positive and negative wrong, matrix host protocol, baud rate and control The protocol of the device, the baud rate is inconsistent, the communication distance exceeds the limit or Front-end PTZ fault caused; control keyboard is locked ball machine, Can not control it. First, the PTZ control line can not be positive and negative polarity Connected to the wrong, that is, check 485 control line is received on the RS-485, And then check the 485 control line "+, -" is connected to the matrix master Machine selected protocol, baud rate and control device protocol, wave Whether the same rate, the keyboard function settings, press the keyboard On the device keys, select the device you want to set, you can pass on , The left and right keys to select the protocol and baud rate, select the good after Press the Save key on the keyboard to confirm, select the protocol and Porter Rate with the PTZ or high-speed dome camera just power up on the monitor Display the same; the matrix host selects the control address and is charged The address of the device to be controlled is the same as the address of the device to be controlled Through the top of the DIP switch to set. Finally check the 485 line Of the communication distance is more than the limit, 485 control lines in general Not exceeding 1200 meters, such as overrun, you need to increase in the first end 120 ohm matching resistor. If there is a problem with the front head, check The static back is extracted the visual field of the video device on the PTZ Scene image, send a rotation command to it, and then grab the cloud to be measured The current field of view image is compared with the preceding still image If the difference value is greater than the predetermined threshold value, it is determined that the PTZ to be measured is rotated Success, or that the PTT to be tested failure, the replacement can be resolved,Of course, if the video monitor tester can be better, faster on Front-end PTZ to detect, to determine whether there is failure; Device display C lock, that the ball is the keyboard lock, so not Can control, use SHIFT and LOCK key combination can unlock, Restores control of its dome.
Fault 9: matrix keyboard can not log matrix, there is Alarm sound, keyboard key failure, the keypad light off when the light;Keyboard landing matrix, can not switch images.Troubleshooting: This phenomenon may be caused by communication anomalies,There is a fault on the network and the keyboard has no corresponding rights to the matrix.First check the keyboard and matrix communication is normal, observe the matrix After the control network port lights flashing is normal, if not normal, check Its wiring is correct. Such as the keyboard and the matrix is through the switch Network connection, access to the military integrated network, such as network congestion Or network failure, can not be normal landing matrix control,Unplug the network cable the network interface and connect the switch Of the control line directly after the control network access matrix, or disconnect Military network, restart the device before resolving this fault; landing matrix, Can not effectively switch the image, the keyboard screen display on the monitorLocked, can not override, that the monitor is locked, must beUnlock to control, the method is to enter the serial number of the monitoring point, and then Press the SHIFT and LOCK keys to unlock the recovery Normal switching.