There are many factors that can prevent the printer from joining the network. Here are some of the most common troubleshooting solutions:
Make sure that the printer/print server settings match those used by your wireless network.
Make sure security keys are correct.
Make sure that the printer/print server is within range of the network.
If your network uses MAC address filtering, provide the MAC address for the printer to your network. If you need help finding the MAC address, see Finding your MAC address.