Sony has two codes for CD players, 001 and 002, but typically these do not provide full support of your changer.

If you have the original remote, learn from it. If you don't, and can't borrow one to learn from, then this is not an option, of course.

If you want to use advanced codes, which are codes accessible through certain Radio Shack/OneForAll remotes, you could get more functions. The OFA URC-6131 will accept these advanced codes, at a reasonable price.

To see what advanced codes are available for your CD, go here.
[Link: hifi-remote.com]

Click here to learn about advanced/discrete codes and which RS/OFA remote to use.