User Guide for the VC400 Video Conferencing System124How to adjust room lighting?You can alter the environmental lighting and background colors of your environment toobtain the best video quality. If light levels are too low you may consider addingartificial lighting. Reflected light from pale walls often produces excellent results.Avoid the following situations: Direct sunlight on the display device, the background, or the camera lens whichcreates harsh contrasts. Colored lighting.Why can‟t I adjust the camera angle and focus? You can adjust the camera when the system is idle or during a call. The cameracannot be adjusted when the system is in the menu screen. Ensure that the batteries in the remote control are in good working condition, andinstalled correctly. Aim the remote control at the sensor when you perform a task. Ensure that no objects are obstructing the sensor on the front of the camera. Ensure that the LED on the front of the camera flashes green when you use theremote control to perform a task. Ensure that what you are controlling is the local camera. Reboot the system. If the above suggestions cannot solve your problem, perhaps the remote control isbroken. You can contact your system administrator for help.Why is the video quality bad? Ensure that the display device has suitable resolution. Check whether the packet has been lost. For more information on packet loss, referto Call Statistics on page 101. Contact your administrator to adjust the camera brightness and white balance.Why is there no video on the display device? Ensure that the display device is turned on. Ensure that the display device is properly connected to VC400codec.