The pull cord for our fan broke.. when I took the switch apart to replace it.. the four wires (black, yellow, orange, and purple) popped out before I could make note of were they were supposed to go... the model number of the fan is... M48-3B/3L...
Thanks

Check this thread here:

Hampton bay fan switch wiring

And here's more information on replacing pullchains:

Ceiling fan pull chain replacement and repair - Ceiling Fans N More