i've tried both codes (as well as manually scanning) with no luck. i even talked to a tech rep at Sony and they basically said that if one of those codes didn't work than my IR sensor might be bad. i find that hard to believe, but stranger things have happened...i hate to buy the OEM (RM-DX300), just to get my remote to learn the codes, especially when i can get a used 335/400 disc changer with a remote for not much more than the remote costs by itself.