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No, leave them plugged in and see if you select a channel and change it from "off" or "Auto" to "on" and the corresponding LED should light up if they're communicating.
That's another thing, is the channel on "Auto" and not "Off"? Also, is the power switch on the PC4 turned on? Not trying to make you feel dumb, just making sure.
That's another thing, is the channel on "Auto" and not "Off"? Also, is the power switch on the PC4 turned on? Not trying to make you feel dumb, just making sure.