These are some common tools used to work on this device. You might not need every tool for every procedure.
A1137 1GB, A1137 2GB, A1137 4GB
Track down a number of hardware problems using the iPod Nano 1st Generation Troubleshooting Guide.
Identification and Background
Designed to replace the iPod mini, the first generation iPod nano was offered with either a black or white plastic front case. It came in 1, 2, and 4 GB versions with all sporting a standard color display.
Use the iPod identification system to help you identify your iPod. They tend to look very similar, and it's important to know which one you have before ordering any replacement parts.