I've had an RM-VL600 for years and have been quite happy with it. The other day all the buttons in the rightmost column of buttons (power, CBL, AMP, 3, 6, 9, etc. through to the pause and system control D buttons at the bottom) stopped working altogether, so I figured it was time for a new one.

I bought an RMVLZ620 since that seems to be the current model. And aside from the annoying additional buttons required to learn commands, it seems to be working well (I programmed it for my Samsung TV, FIOS STB, Sony DVD changer, Sony VCR, Roku box, and even my LG air conditioner). But there is ONE particular command I just can't seem to get the 620 to learn.

It's the command to select the "DVD" input on my decade-old Harman Kardon receiver.

My Sony 600 learned this command without any trouble (and I'm still able to program it into my partially disabled 600 as long as I use a device select button other than the dead CBL and AMP buttons). And the 620 seems to learn all the other buttons I've tried to program from the HK remote.

But I cannot for the life of me get the 620 to learn this particular command. I've tried "teaching" the 620 the DVD input command from both the original HK remote and from the 600, but it just doesn't seem to learn it.

Any suggestions? I suppose I could go back to the default Harman Kardon button setup for the 620, which included the DVD input on one of the number keys, but I find it hard to remember (I wanted to redo it so that buttons 1-4 were Video 1 through Video 4 and 5 was DVD, which I find easier to remember).

Are there simply some IR sequences that the 600 could learn but the 620 can't?

Hmmm... that was a little rambly.

To be clear:

1) I want to program a specific button on my RMVLZ620 to select the "DVD" input on my Harman Kardon receiver.
2) My old RM-VL600 was and still is capable of learning this command
3) The 620 is capable of DOING this command (since when I put in the correct Harman Kardon preset code, #2 on the remote is assigned to this function by default and it works fine with the receiver--but I want to assign it to a different key)
4) The 620 is capable of learning OTHER commands relating to this device (including all the other input select buttons).
5) The 620 does not seem able to learn this command (so I can't program a key other than #2 to do it) from either my original HK remote or from my 600.

Weird, huh?

When a sony 620 remotes has the learning problem, it can't learn any command, not just certain ones. If your 620 was able to be taught other commands without trouble, just not this one, then it sounds like you're out of memory.

I don't think it's a memory issue. I'm still able to program other commands from the HK and other remotes. I just can't get it to learn this one particular command. It's so strange.