I'm not sure exactly which model of the systemlink 3 series remotes
you have, but I found that RCA's website contains the information that
will help you with the programming of whichever one you own.
If you go to RCA's support page, you can tell it which remote control
you have and then you can tell it what you need help with (programming
TV, VCR, codes, etc). It will give you the instructions on each
That page starts here:
Alternately, you can access full PDF versions of the user manuals for
a couple of the different systemlink 3 remotes from their website
(which was well-hidden by the way). You will need the Free ADOBE
Acrobat Reader in order to open the PDF files (http://www.adobe.com).
Systemlink 3 RCU-300
Systemlink 3 RCU-1300
I couldn't find full manuals online for the RCU-303, 403 or 430
series. They might be very similar to one of the others. The
troubleshooter listed above does list all of them however and should
be able to give you the instructions you need.
I hope that helps to answer your question. Please don't hesitate to
ask for clarification should you need further assistance with this