I have a 2805, (which I'm really happy with), but if you want to switch ONLY video source, not both audio and video together, you have to do it on the front panel of the receiver. There is a small button below the source switching dial on the left side of the receiver labeled "video select". If you have selected a combined audio/video source, say "DVD", and want to switch the video source while continuing to listen to the same audio source, then you have to depress the "video select" button, then rotate the dial to your desired video input. If you want to switch audio and video combined, then the yellow number buttons on the remote do that, just make sure you have the "amp" mode button on the remote selected. Hope this helps.
WoodieB