Can not program remotes for ONKYO receiver model TX-SR494

I recently replaced a malfunctioning Sony receiver with a new Onkyo TX-SR494 and I have run into a brick wall trying to program the three remotes that I use for this setup, two of which are RC71's and one a RC73.  I am using a genie DVR and satellite dish at present and all that works perfectly.  I have searched the web extensively and tried everything out there that I possibly can.  However, I can not program the Onkyo.  There are two primary possible reasons for this.  First I do not know the correct code for this Onkyo receiver as none of those listed by Directv or otherwise found on the web seem to work.  Second, and possibly the key to the whole sorry mess is that ALL online instructions start out with a step I can not complete specifically"move the switch to AV1" on the remotes.  None of my remotes have such a mode switch and the online work around of long press on the enter button and then press to move between inputs does absolutely nothing as far as I can tell (since nothing seems to change when I use this procedure and there is no on screen info change to show which input is selected).  Any help with this would be appreciated.  If I can't fix this I will soon get to the point of dumping Directv altogether.