Unable to program RC72 Remote - DirecTV

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I just installed a replacement receiver/dvr after the previous one failed. I programmed the new RC73 Remote I received and it works ok. My problem is not being able to program my old RC72 Remote. I changed the batteries and was able to start the Video, a Sharp LC52D62U, as before but it does not start the replacement receiver/dvd. I started the Video and replacement receiver/dvd with the new RC73 remote and went through the Menu>Program Remote drill with the RC72 Remote without success several times. According to the literature the new receiver/dvr should be compatible with both the RC73 and RC72 remotes but I have had no success with the latter. Can anyone out there assist me in getting it working or is it incompatible or has it failed? Your assistance is appreciated in advance.

This question, "Unable to program RC72 Remote," is about DirecTV channels, programming, equipment, and sports.