If you are using an MRF-200/250 and you are trying to connect directly to an IR input of a component, you NEED a resistor. The MRF-200/250 wasn't designed for that type of operation, so you risk damaged equipment if you do not use one.
Now, in response to your main question...
I know many Panasonic CRT TVs allow you to press "TV/VIDEO" to get a list of numbered inputs. If you press the corresponding number of one of the inputs listed, it goes to that input. That is the best way to program the remote, if there are no discrete input commands on the remote.
Thank you,
Damon DG
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