According to the definitive Sony remote control site, the code that you need is AMP/0689 (which is present in the Cinema 7)

[Link: hifi-remote.com]

Coby uses several different codes for their DVD players, so I'd need to know which one you have to know what the right code is. They're all pretty standard codes, so you might be able to use advanced codes with one of the built in codes to get it working, but if you want a new complete code for it, you'll need to go the JP1 route.