Okay. I would turn on the TV 1 modulator and set it to a different channel. It's up to you whether you want to use the cable setting or an over-the-air channel - you just need to make sure your second TV has it's tuner set to match whatever you choose. After you turn on the TV1 modulator, try both channels on the second TV and see whether you are getting programming on either of them. (If you're operating the 622 in single mode, you should see the same programing on both channels. If you switch it to dual mode, you would get the signal from the TV2 tuner on cable channel 73, and video from the TV 1 tuner on whatever channel you chose.) You may want to experiment with higher and lower channel numbers and the cable setting vs. the off air setting since some people report better picture quality using a different channel frequency. I have both the TV1 and TV2 modulators turned on (even though I usually operate in single mode) and use over-the-air channel numbers in the 60's. I tried switching to channels in the 20's after seeing some reports of better results - but for me the picture quality was worse, and I went back to what I had before.