Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
The part number of the remote is 648263, though this is a very old (2002) model system, so all parts and support for it were discontinued over 10 years ago.
They can still be found, but can be costly and are often only available used.
Here is one option: http://www.ebay.com/itm/PANSONIC-Remote-Control-EUR648263-for-Portable-Stereo-CD-System-RX-DX1/232053181697
which luckily is very inexpensive compared to what they usually run. If you want it, I'd suggest doing the buy it now immediately before it is gone, as all other options I can find are well over $40.
If you have any other questions, just let me know. Otherwise, please take a moment to rate my service using the stars at the top of the page; hopefully I have earned 5 Stars. I also invite you to contact me directly with any future support needs at http://bit.ly/1QwLxGh and ask for Nathan.
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