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That looks like a first generation infrared space command set. The channel numbers should be white on screen. You will need to set it to "CATV" if you're using cable, or "b'cast" if you're using an antenna. You should always be able to change it to any channel by typing in the number and pressing enter. It also probably has a way to add, or delete channels from the +/- channel scan. It might default to having all channels deleted, which would make it look like the channel up/down buttons aren't working. The highest channel it will be able to get in CATV mode is probably between 36 and 46. It also might be able to change to higher CATV channels than it can actually receive. There should be basic instructions on the inside of the control door.
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