Resetting a TSP100LAN

If you are have problems with a star TSP100 LANs IP address the following procedure can sometimes reset it to DHCP.

1. Turn your printer off at the switch on the side
2. Open the paper hatch and leave it open
3. With the paper hatch open, hold down the Feed button and while you're holding it down, switch the printer back on. Keep holding the feed button.
4. Keep your finger on the Feed button until the Ready and Error lights start to blink blue and red. Once they start flashing, release the Feed button. 
5. Close the paper hatch. 
6. Turn off the printer. When you power it back on, the printer will be set to DHCP. 

If this doesn't work there is a method for doing a reset with dip switches on the printer

Ethernet/WiFi Reset on Star Printers - YouTube