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The video image is black and white.The color saturation regulator of the indoor station is at minimum.Adjust the contrast / color saturation regulator.The transmission level of the video BUS is too low.The transmission level can be readjusted on many components of the video BUS (e.g. FVY). Please refer to the product information for the active transmission components.The light barrier does not reach the minimum value of 10 lux. Therefore the camera switches to black and white.The camera module of the video front-door station is very insensitive to light. Please ensure there is sufficient lighting or use external cameras.The colors of the video picture are too bright or the picture is too bright overall.The color saturation is set too high.Reduce the color saturation using the color saturation controller on the video door intercom.The brightness is set too high.Reduce the level of the video BUS (e.g. rotary control on the circuit board of the camera). Only works if the terminating resistor is correctly plugged into the video indoor station or active function extension (e.g. Art. FVY).The terminating resistor at the end of the video line is not connected.Insert the terminating resistor in the last device of the video line.The colors of the video image are without contrast.The video signal level is not high enough.The connection cable of a camera assembly was inadmissibly extended. The cable length between two active video components has not been exceeded. Loss of level can be compensated to a certain extent using rotary controls on active video components (see product information for the components). Check whether the number of video indoor stations does not exceed the prescribed number per line.The terminating resistors are not correctly plugged into video distributors.Remove the terminating resistors from the affected components. Only the last video component in a line requires a terminating resistor.In a building unit with several video indoor stations, there are only black stripes on the video image for one video indoor station.Interference from contact resistance.Check whether the P-wire is connected correctly and whether the connection contacts are connected correctly.Interference from neighboring sources of interference such as external power packs or other electrical devices that are not properly shielded.The location of the video distributor or other passive assembly groups must be changed.Loop-in disturbances due to external current caused by potential differences.Check your cable routing and try to install active components at a potential.Distorted picture.Incorrect video signal due to interchanging the video wires.The video BUS is not protected against polarity reversal. Swap wires V1 and V2.The picture is "running".The video signal cannot be synchronized.Check whether all wires of the video bus are connected. If necessary, readjust the transmission level.The video signal level is not correct.The video stream is not completed. Insert the terminating resistor in the last device of the video line.Multiple appearing contours.Image reflections, so-called "ghost images" occur on open lines.The video stream is not completed. Insert the terminating resistor in the last device of the video line.Outlines of a second image can be seen. Two video sources are superimposed. Remove the second video source from the strand. If necessary, connect this to the existing TCS: BUS using a video switch.No picture. There is no reaction when the image button is pressed.There is no signal.Connect the monitor in front of the video switch and check whether a signal is present here. Measure the voltage between P and b. The voltage is approx. 24 V. If this is not the case, check the TCS: BUS voltage supply.Both wires of the video BUS are not connected.Check the correct connection of the plug-in terminal.