Xerox 1235/DX - Phaser Color Laser Printer Network Manual page 30

Press Item Up or Item Down until you see:
5.
Ethernet Menu
IP Address
6. Press Value Up or Value Down until you see:
IP Address
xxx.xxx.xxx.xxx
7. Use Value Up or Value Down to increment the underlined value
in the IP Address by 1 each time the key is pressed. Holding down
Value Up or Value Down causes continuous scrolling through the
values.
8. Use Item Up or Item Down to scroll left or right respectively
through the positions of the IP Address and repeat Step 4 above
until you have completely selected the IP Address.
9. Press Enter to set the IP Address after you have completed
selecting it.
10.
Reset the Printer to have the new settings take effect.