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 (http://www.bandwidthcrazy.com/ceilingfans/viewtopic.php?p=1449)

And here's more information on replacing pullchains:

Ceiling fan pull chain replacement and repair - Ceiling Fans N More (http://www.ceiling-fans-n-more.com/ceiling-fan-pullchain-replacement-and-repair.php)